Changing font size and direction of axes text in ggplot2

Use theme():

d <- data.frame(x=gl(10, 1, 10, labels=paste("long text label ", letters[1:10])), y=rnorm(10))
ggplot(d, aes(x=x, y=y)) + geom_point() +
    theme(text = element_text(size=20),
        axis.text.x = element_text(angle=90, hjust=1)) 
#vjust adjust the vertical justification of the labels, which is often useful

enter image description here

There's lots of good information about how to format your ggplots here. You can see a full list of parameters you can modify (basically, all of them) using ?theme.

Checking if a variable is initialized

By default, no you can't know if a variable (or pointer) has or hasn't been initialized. However, since everyone else is telling you the "easy" or "normal" approach, I'll give you something else to think about. Here's how you could keep track of something like that (no, I personally would never do this, but perhaps you have different needs than me).

class MyVeryCoolInteger
{
public:
    MyVeryCoolInteger() : m_initialized(false) {}

    MyVeryCoolInteger& operator=(const int integer)
    {
        m_initialized = true;
        m_int = integer;
        return *this;
    }

    int value()
    {
        return m_int;
    }

    bool isInitialized()
    {
        return m_initialized;
    }

private:
    int m_int;
    bool m_initialized;
};

Insert data using Entity Framework model

var context = new DatabaseEntities();

var t = new test //Make sure you have a table called test in DB
{
    ID = Guid.NewGuid(),
    name = "blah",
};

context.test.Add(t);
context.SaveChanges();

Should do it

Why do you need to put #!/bin/bash at the beginning of a script file?

It's called a shebang. In unix-speak, # is called sharp (like in music) or hash (like hashtags on twitter), and ! is called bang. (You can actually reference your previous shell command with !!, called bang-bang). So when put together, you get haSH-BANG, or shebang.

The part after the #! tells Unix what program to use to run it. If it isn't specified, it will try with bash (or sh, or zsh, or whatever your $SHELL variable is) but if it's there it will use that program. Plus, # is a comment in most languages, so the line gets ignored in the subsequent execution.

How to reference static assets within vue javascript

Of course src="@/assets/images/x.jpg works, but better way is: src="~assets/images/x.jpg

Angular Directive refresh on parameter change

I hope this will help reloading/refreshing directive on value from parent scope

<html>

        <head>
            <!-- version 1.4.5 -->
            <script src="angular.js"></script>
        </head>

        <body ng-app="app" ng-controller="Ctrl">

            <my-test reload-on="update"></my-test><br>
            <button ng-click="update = update+1;">update {{update}}</button>
        </body>
        <script>
            var app = angular.module('app', [])
            app.controller('Ctrl', function($scope) {

                $scope.update = 0;
            });
            app.directive('myTest', function() {
                return {
                    restrict: 'AE',
                    scope: {
                        reloadOn: '='
                    },
                    controller: function($scope) {
                        $scope.$watch('reloadOn', function(newVal, oldVal) {
                            //  all directive code here
                            console.log("Reloaded successfully......" + $scope.reloadOn);
                        });
                    },
                    template: '<span>  {{reloadOn}} </span>'
                }
            });
        </script>


   </html>

Determining the path that a yum package installed to

yum uses RPM, so the following command will list the contents of the installed package:

$ rpm -ql package-name

Finding an elements XPath using IE Developer tool

Are you trying to find some work around getting xpath in IE?

There are many add-ons for other browsers like xpather for Chrome or xpather, xpath-checker and firebug for FireFox that will give you the xpath of an element in a second. But sadly there is no add-on or tool available that will do this for IE. For most cases you can get the xpath of the elements that fall in your script using the above tools in Firefox and tweak them a little (if required) to make them work in IE.

But if you are testing an application that will work only in IE or the specific scenario or page that has this element will open-up/play-out only in IE then you cannot use any of the above mention tools to find the XPATH. Well the only thing that works in this case is the Bookmarklets that were coded just for this purpose. Bookmarklets are JavaScript code that you will add in IE as bookmarks and later use to get the XPATH of the element you desire. Using these you can get the XPATH as easily as you get using xpather or any other firefox addon.

STEPS TO INSTALL BOOKMARKLETS

1)Open IE

2)Type about:blank in the address bar and hit enter

3)From Favorites main menu select ---> Add favorites

4) In the Add a favorite popup window enter name GetXPATH1.

5)Click add button in the add a favorite popup window.

6)Open the Favorites menu and right click the newly added favorite and select properties option.

7)GetXPATH1 Properties will open up. Select the web Document Tab.

8)Enter the following in the URL field.

javascript:function getNode(node){var nodeExpr=node.tagName;if(!nodeExpr)return null;if(node.id!=''){nodeExpr+="[@id='"+node.id+"']";return "/"+nodeExpr;}var rank=1;var ps=node.previousSibling;while(ps){if(ps.tagName==node.tagName){rank++;}ps=ps.previousSibling;}if(rank>1){nodeExpr+='['+rank+']';}else{var ns=node.nextSibling;while(ns){if(ns.tagName==node.tagName){nodeExpr+='[1]';break;}ns=ns.nextSibling;}}return nodeExpr;}

9)Click Ok. Click YES on the popup alert.

10)Add another favorite by following steps 3 to 5, Name this favorite GetXPATH2 (step4)

11)Repeat steps 6 and 7 for GetXPATH2 that you just created.

12)Enter the following in the URL field for GetXPATH2

javascript:function o__o(){var currentNode=document.selection.createRange().parentElement();var path=[];while(currentNode){var pe=getNode(currentNode);if(pe){path.push(pe);if(pe.indexOf('@id')!=-1)break;}currentNode=currentNode.parentNode;}var xpath="/"+path.reverse().join('/');clipboardData.setData("Text", xpath);}o__o();

13)Repeat Step 9.

You are all done!!

Now to get the XPATH of elements just select the element with your mouse. This would involve clicking the left mouse button just before the element (link, button, image, checkbox, text etc) begins and dragging it till the element ends. Once you do this first select the favorite GetXPATH1 from the favorites menu and then select the second favorite GetXPATH2. At this point you will get a confirmation, hit allow access button. Now open up a notepad file, right click and select paste option. This will give you the XPATH of the element you seek.

Import functions from another js file. Javascript

From a quick glance on MDN I think you may need to include the .js at the end of your file name so the import would read import './course.js' instead of import './course'

Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import

Pylint, PyChecker or PyFlakes?

pep8 was recently added to PyPi.

pep8 - Python style guide checker
pep8 is a tool to check your Python code against some of the style conventions in PEP 8.

It is now super easy to check your code against pep8.

See http://pypi.python.org/pypi/pep8

How to add an integer to each element in a list?

When should I use cross apply over inner join?

Cross apply works well with an XML field as well. If you wish to select node values in combination with other fields.

For example, if you have a table containing some xml

<root>
    <subnode1>
       <some_node value="1" />
       <some_node value="2" />
       <some_node value="3" />
       <some_node value="4" />
    </subnode1>
</root>

Using the query

SELECT
       id as [xt_id]
      ,xmlfield.value('(/root/@attribute)[1]', 'varchar(50)') root_attribute_value
  ,node_attribute_value = [some_node].value('@value', 'int')
  ,lt.lt_name   
FROM dbo.table_with_xml xt
CROSS APPLY xmlfield.nodes('/root/subnode1/some_node') as g ([some_node])
LEFT OUTER JOIN dbo.lookup_table lt
ON [some_node].value('@value', 'int') = lt.lt_id

Will return a result

xt_id root_attribute_value node_attribute_value lt_name
----------------------------------------------------------------------
1     test1            1                    Benefits
1     test1            4                    FINRPTCOMPANY

Import an existing git project into GitLab?

Here are the steps provided by the Gitlab:

cd existing_repo
git remote rename origin old-origin
git remote add origin https://gitlab.example.com/rmishra/demoapp.git
git push -u origin --all
git push -u origin --tags

Color text in terminal applications in UNIX

Different solution that I find more elegant

Here's another way to do it. Some people will prefer this as the code is a bit cleaner. There are no %s and a RESET color to end the coloration.

#include <stdio.h>

#define RED   "\x1B[31m"
#define GRN   "\x1B[32m"
#define YEL   "\x1B[33m"
#define BLU   "\x1B[34m"
#define MAG   "\x1B[35m"
#define CYN   "\x1B[36m"
#define WHT   "\x1B[37m"
#define RESET "\x1B[0m"

int main() {
  printf(RED "red\n"     RESET);
  printf(GRN "green\n"   RESET);
  printf(YEL "yellow\n"  RESET);
  printf(BLU "blue\n"    RESET);
  printf(MAG "magenta\n" RESET);
  printf(CYN "cyan\n"    RESET);
  printf(WHT "white\n"   RESET);

  return 0;
}

This program gives the following output:

Simple example with multiple colors

This way, it's easy to do something like:

printf("This is " RED "red" RESET " and this is " BLU "blue" RESET "\n");

This line produces the following output:

CSS to prevent child element from inheriting parent styles

Unfortunately, you're out of luck here.

There is inherit to copy a certain value from a parent to its children, but there is no property the other way round (which would involve another selector to decide which style to revert).

You will have to revert style changes manually:

div { color: green; }

form div { color: red; }

form div div.content { color: green; }

If you have access to the markup, you can add several classes to style precisely what you need:

form div.sub { color: red; }

form div div.content { /* remains green */ }

Edit: The CSS Working Group is up to something:

div.content {
  all: revert;
}

No idea, when or if ever this will be implemented by browsers.

Edit 2: As of March 2015 all modern browsers but Safari and IE/Edge have implemented it: https://twitter.com/LeaVerou/status/577390241763467264 (thanks, @Lea Verou!)

Edit 3: default was renamed to revert.

Open-Source Examples of well-designed Android Applications?

Are the Android samples not good enough? I've found the ApiDemos to be indispensable when learning a new aspect of Android, myself.

Can I set a breakpoint on 'memory access' in GDB?

Use watch to see when a variable is written to, rwatch when it is read and awatch when it is read/written from/to, as noted above. However, please note that to use this command, you must break the program, and the variable must be in scope when you've broken the program:

Use the watch command. The argument to the watch command is an expression that is evaluated. This implies that the variabel you want to set a watchpoint on must be in the current scope. So, to set a watchpoint on a non-global variable, you must have set a breakpoint that will stop your program when the variable is in scope. You set the watchpoint after the program breaks.

In MVC, how do I return a string result?

public ActionResult GetAjaxValue()
{
   return Content("string value");
}

jQuery Combobox/select autocomplete?

This works great for me and I'm doing more, writing less with jQuery's example modified.

I defined the select object on my page, just like the jQuery ex. I took the text and pushed it to an array. Then I use the array as my source to my input autocomplete. tadaa.

$(function() {
   var mySource = [];
   $("#mySelect").children("option").map(function() {
      mySource.push($(this).text());
   });

   $("#myInput").autocomplete({
      source: mySource,
      minLength: 3
   });
}

Picasso v/s Imageloader v/s Fresco vs Glide

Neither Glide nor Picasso is perfect. The way Glide loads an image to memory and do the caching is better than Picasso which let an image loaded far faster. In addition, it also helps preventing an app from popular OutOfMemoryError. GIF Animation loading is a killing feature provided by Glide. Anyway Picasso decodes an image with better quality than Glide.

Which one do I prefer? Although I use Picasso for such a very long time, I must admit that I now prefer Glide. But I would recommend you to change Bitmap Format to ARGB_8888 and let Glide cache both full-size image and resized one first. The rest would do your job great!

Method count of Picasso and Glide are at 840 and 2678 respectively.
Picasso (v2.5.1)'s size is around 118KB while Glide (v3.5.2)'s is around 430KB.
Glide creates cached images per size while Picasso saves the full image and process it, so on load it shows faster with Glide but uses more memory.
Glide use less memory by default with RGB_565.

+1 For Picasso Palette Helper.

There is a post that talk a lot about Picasso vs Glide post

How to trigger a phone call when clicking a link in a web page on mobile phone

Clickable smartphone link code:

The following link can be used to make a clickable phone link. You can copy the code below and paste it into your webpage, then edit with your phone number. This code may not work on all phones but does work for iPhone, Droid / Android, and Blackberry.

<a href="tel:1-847-555-5555">1-847-555-5555</a>

Phone number links can be used with the dashes, as shown above, or without them as well as in the following example:

<a href="tel:18475555555">1-847-555-5555</a>

It is also possible to use any text in the link as long as the phone number is set up with the "tel:18475555555" as in this example:

<a href="tel:18475555555">Click Here To Call Support 1-847-555-5555</a>

Below is a clickable telephone hyperlink you can check out. In most non-phone browsers this link will give you a "The webpage cannot be displayed" error or nothing will happen.

NOTE: The iPhone Safari browser will automatically detect a phone number on a page and will convert the text into a call link without using any of the code on this page.

WTAI smartphone link code: The WTAI or "Wireless Telephony Application Interface" link code is shown below. This code is considered to be the correct mobile phone protocol and will work on smartphones like Droid, however, it may not work for Apple Safari on iPhone and the above code is recommended.

<a href="wtai://wp/mc;18475555555">Click Here To Call Support 1-847-555-5555</a>

How to check if a variable is NULL, then set it with a MySQL stored procedure?

@last_run_time is a 9.4. User-Defined Variables and last_run_time datetime one 13.6.4.1. Local Variable DECLARE Syntax, are different variables.

Try: SELECT last_run_time;

UPDATE

Example:

/* CODE FOR DEMONSTRATION PURPOSES */
DELIMITER $$

CREATE PROCEDURE `sp_test`()
BEGIN
    DECLARE current_procedure_name CHAR(60) DEFAULT 'accounts_general';
    DECLARE last_run_time DATETIME DEFAULT NULL;
    DECLARE current_run_time DATETIME DEFAULT NOW();

    -- Define the last run time
    SET last_run_time := (SELECT MAX(runtime) FROM dynamo.runtimes WHERE procedure_name = current_procedure_name);

    -- if there is no last run time found then use yesterday as starting point
    IF(last_run_time IS NULL) THEN
        SET last_run_time := DATE_SUB(NOW(), INTERVAL 1 DAY);
    END IF;

    SELECT last_run_time;

    -- Insert variables in table2
    INSERT INTO table2 (col0, col1, col2) VALUES (current_procedure_name, last_run_time, current_run_time);
END$$

DELIMITER ;

Python urllib2: Receive JSON response from url

Python 3 standard library one-liner:

load(urlopen(url))

# imports (place these above the code before running it)
from json import load
from urllib.request import urlopen
url = 'https://jsonplaceholder.typicode.com/todos/1'

How to design RESTful search/filtering?

As I'm using a laravel/php backend I tend to go with something like this:

/resource?filters[status_id]=1&filters[city]=Sydney&page=2&include=relatedResource

PHP automatically turns [] params into an array, so in this example I'll end up with a $filter variable that holds an array/object of filters, along with a page and any related resources I want eager loaded.

If you use another language, this might still be a good convention and you can create a parser to convert [] to an array.

Adding and removing style attribute from div with jquery

Anwer is here How to dynamically add a style for text-align using jQuery

offsetTop vs. jQuery.offset().top

It is possible that the offset could be a non-integer, using em as the measurement unit, relative font-sizes in %.

I also theorise that the offset might not be a whole number when the zoom isn't 100% but that depends how the browser handles scaling.

Draw text in OpenGL ES

In the OpenGL ES 2.0/3.0 you can also combining OGL View and Android's UI-elements:

public class GameActivity extends AppCompatActivity {
    private SurfaceView surfaceView;
    @Override
    protected void onCreate(Bundle state) { 
        setContentView(R.layout.activity_gl);
        surfaceView = findViewById(R.id.oglView);
        surfaceView.init(this.getApplicationContext());
        ...
    } 
}

public class SurfaceView extends GLSurfaceView {
    private SceneRenderer renderer;
    public SurfaceView(Context context) {
        super(context);
    }

    public SurfaceView(Context context, AttributeSet attributes) {
        super(context, attributes);
    }

    public void init(Context context) {
        renderer = new SceneRenderer(context);
        setRenderer(renderer);
        ...
    }
}

Create layout activity_gl.xml:

<?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout
        tools:context=".activities.GameActivity">
    <com.app.SurfaceView
        android:id="@+id/oglView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <TextView ... />
    <TextView ... />
    <TextView ... />
</androidx.constraintlayout.widget.ConstraintLayout>

To update elements from the render thread, can use Handler/Looper.

How can I set / change DNS using the command-prompt at windows 8

First, the network name is likely "Ethernet", not "Local Area Connection". To find out the name you can do this:

netsh interface show interface

Which will show the name under the "Interface Name" column (shown here in bold):

Admin State    State          Type             Interface Name
-------------------------------------------------------------------------
Enabled        Connected      Dedicated        Ethernet

Now you can change the primary dns (index=1), assuming that your interface is static (not using dhcp):

netsh interface ipv4 add dnsserver "Ethernet" address=192.168.x.x index=1

2018 Update - The command will work with either dnsserver (singular) or dnsservers (plural). The following example uses the latter and is valid as well:

netsh interface ipv4 add dnsservers "Ethernet" address=192.168.x.x index=1

Exit from app when click button in android phonegap?

There are different ways to close the app, depending on:

if (navigator.app) {
    navigator.app.exitApp();
} else if (navigator.device) {
    navigator.device.exitApp();
} else {
    window.close();
}

Finding the index of an item in a list

Simply you can go with

a = [['hand', 'head'], ['phone', 'wallet'], ['lost', 'stock']]
b = ['phone', 'lost']

res = [[x[0] for x in a].index(y) for y in b]

jQuery UI: Datepicker set year range dropdown to 100 years

You can set the year range using this option in jQuery UI datepicker:

yearRange: "c-100:c+0", // last hundred years and current years

yearRange: "c-100:c+100", // last hundred years and future hundred years

yearRange: "c-10:c+10", // last ten years and future ten years

CSS grid wrapping

I had a similar situation. On top of what you did, I wanted to center my columns in the container while not allowing empty columns to for them left or right:

.grid { 
    display: grid;
    grid-gap: 10px;
    justify-content: center;
    grid-template-columns: repeat(auto-fit, minmax(200px, auto));
}

How to use LINQ Distinct() with multiple fields

This is my solution, it supports keySelectors of different types:

public static IEnumerable<TSource> DistinctBy<TSource>(this IEnumerable<TSource> source, params Func<TSource, object>[] keySelectors)
{
    // initialize the table
    var seenKeysTable = keySelectors.ToDictionary(x => x, x => new HashSet<object>());

    // loop through each element in source
    foreach (var element in source)
    {
        // initialize the flag to true
        var flag = true;

        // loop through each keySelector a
        foreach (var (keySelector, hashSet) in seenKeysTable)
        {                    
            // if all conditions are true
            flag = flag && hashSet.Add(keySelector(element));
        }

        // if no duplicate key was added to table, then yield the list element
        if (flag)
        {
            yield return element;
        }
    }
}

To use it:

list.DistinctBy(d => d.CategoryId, d => d.CategoryName)

How to use java.net.URLConnection to fire and handle HTTP requests?

Update

The new HTTP Client shipped with Java 9 but as part of an Incubator module named jdk.incubator.httpclient. Incubator modules are a means of putting non-final APIs in the hands of developers while the APIs progress towards either finalization or removal in a future release.

In Java 9, you can send a GET request like:

// GET
HttpResponse response = HttpRequest
    .create(new URI("http://www.stackoverflow.com"))
    .headers("Foo", "foovalue", "Bar", "barvalue")
    .GET()
    .response();

Then you can examine the returned HttpResponse:

int statusCode = response.statusCode();
String responseBody = response.body(HttpResponse.asString());

Since this new HTTP Client is in ~~java.httpclient~~ jdk.incubator.httpclient module, you should declare this dependency in your module-info.java file:

module com.foo.bar {
    requires jdk.incubator.httpclient;
}

How can apply multiple background color to one div

You can create something like c using CSS multiple-backgrounds.

div {
    background: linear-gradient(red, red),
                linear-gradient(blue, blue),
                linear-gradient(green, green);
    background-size: 30% 50%,
                     30% 60%,
                     40% 80%;
    background-position: 0% top,
                         calc(30% * 100 / (100 - 30)) top,
                         calc(60% * 100 / (100 - 40)) top;
    background-repeat: no-repeat;
}

Note, you still have to use linear-gradients for background types, because CSS will not allow you to control the background-size of a single color layer. So here we just make a single-color gradient. Then you can control the size/position of each of those blocks of color independently. You also have to make sure they don't repeat, or they'll just expand and cover the whole image.

The trickiest part here is background-position. A background-position of 0% puts your element's left edge at the left. 100% puts its right edge at the right. 50% centers is middle.

For a fun bit of math to solve that, you can guess the transform is probably linear, and just solve two little slope-intercept equations.

// (at 0%, the div's left edge is 0% from the left)
0 = m * 0 + b
// (at 100%, the div's right edge is 100% - width% from the left)
100 = m * (100 - width) + b
b = 0, m = 100 / (100 - width)

so to position our 40% wide div 60% from the left, we put it at 60% * 100 / (100 - 40) (or use css-calc).

How to add manifest permission to an application?

You have to use both Network and Access Network State in manifest file while you are trying load or access to the internet through android emulator.

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

If you are giving only .INTERNET permission, it won't access to the internet.

Difference between \w and \b regular expression meta characters

@Mahender, you probably meant the difference between \W (instead of \w) and \b. If not, then I would agree with @BoltClock and @jwismar above. Otherwise continue reading.

\W would match any non-word character and so its easy to try to use it to match word boundaries. The problem is that it will not match the start or end of a line. \b is more suited for matching word boundaries as it will also match the start or end of a line. Roughly speaking (more experienced users can correct me here) \b can be thought of as (\W|^|$). [Edit: as @?mega mentions below, \b is a zero-length match so (\W|^|$) is not strictly correct, but hopefully helps explain the diff]

Quick example: For the string Hello World, .+\W would match Hello_ (with the space) but will not match World. .+\b would match both Hello and World.

Determine the data types of a data frame's columns

Here is a function that is part of the helpRFunctions package that will return a list of all of the various data types in your data frame, as well as the specific variable names associated with that type.

install.package('devtools') # Only needed if you dont have this installed.
library(devtools)
install_github('adam-m-mcelhinney/helpRFunctions')
library(helpRFunctions)
my.data <- data.frame(y=rnorm(5), 
                  x1=c(1:5), 
                  x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
                  X3=letters[1:5])
t <- list.df.var.types(my.data)
t$factor
t$integer
t$logical
t$numeric

You could then do something like var(my.data[t$numeric]).

Hope this is helpful!

How to export a MySQL database to JSON?

Use the following ruby code

require 'mysql2'

client = Mysql2::Client.new(
  :host => 'your_host', `enter code here`
  :database => 'your_database',
  :username => 'your_username', 
  :password => 'your_password')
table_sql = "show tables"
tables = client.query(table_sql, :as => :array)

open('_output.json', 'a') { |f|       
    tables.each do |table|
        sql = "select * from `#{table.first}`"
        res = client.query(sql, :as => :json)
        f.puts res.to_a.join(",") + "\n"
    end
}

How can I put a ListView into a ScrollView without it collapsing?

This is a combination of the answers by DougW, Good Guy Greg, and Paul. I found it was all needed when trying to use this with a custom listview adapter and non-standard list items otherwise the listview crashed the application (also crashed with the answer by Nex):

public void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null) {
            return;
        }

        int totalHeight = listView.getPaddingTop() + listView.getPaddingBottom();
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            if (listItem instanceof ViewGroup)
                listItem.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
    }

How do I get first name and last name as whole name in a MYSQL query?

When you have three columns : first_name, last_name, mid_name:

SELECT CASE 
    WHEN mid_name IS NULL OR TRIM(mid_name) ='' THEN
        CONCAT_WS( " ", first_name, last_name ) 
    ELSE 
        CONCAT_WS( " ", first_name, mid_name, last_name ) 
    END 
FROM USER;

Set port for php artisan.php serve

You can use

php artisan serve --port 80

Works on Windows platform

Error: EACCES: permission denied, access '/usr/local/lib/node_modules'

Seems like you tried to install a npm package globally rather than locally, as the man npm install describes:

The -g or --global argument will cause npm to install the package globally rather than locally.

Generally, when you are setting up a npm project (among many others that you could have), it's not a good idea to install packages on Node.js global modules (/usr/local/lib/node_modules), as your the debug log suggested.

Instead of using -g, use --save, which will automatically save the package as a dependency for your package.json file:

Like this:

$ npm install express-generator --save

$ cat package.json 
{
  "name": "first_app_generator",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
},
  "author": "ivanleoncz",
  "license": "MIT",
  "dependencies": {
    "express-generator": "^4.16.0"
  }
}

But as the other answers mentioned, if you're going to use -g, you have to use sudo (if your user has sudo privileges: see /etc/sudoers) when performing npm install express-generator -g, but indeed, it's not a good idea, possibly causing permission problems.

NOTICE

There are instructions for installing express-generator with -g option, in order to have the script express-cli.js available on the system path, but you can use the locally installed script as well, located at the node_modules if your npm project:

$ ./node_modules/express-generator/bin/express-cli.js --view=pug myapp

If a message like /usr/bin/env: ‘node’: No such file or directory shows up, install nodejs-legacy (Debian/Ubuntu)

IMHO, using -g (also using sudo) is like hic sunt dracones, if you are unsure of the consequences.

For further information:

How to create a data file for gnuplot?

Create your Datafile like this:

# X      Y
10000.0 0.01
100000.0 0.05
1000000.0 0.45

And plot it with

$ gnuplot -p -e "plot 'filename.dat'"

There is a good tutorial: http://www.gnuplotting.org/introduction/plotting-data/

Add a common Legend for combined ggplots

I suggest using cowplot. From their R vignette:

# load cowplot
library(cowplot)

# down-sampled diamonds data set
dsamp <- diamonds[sample(nrow(diamonds), 1000), ]

# Make three plots.
# We set left and right margins to 0 to remove unnecessary spacing in the
# final plot arrangement.
p1 <- qplot(carat, price, data=dsamp, colour=clarity) +
   theme(plot.margin = unit(c(6,0,6,0), "pt"))
p2 <- qplot(depth, price, data=dsamp, colour=clarity) +
   theme(plot.margin = unit(c(6,0,6,0), "pt")) + ylab("")
p3 <- qplot(color, price, data=dsamp, colour=clarity) +
   theme(plot.margin = unit(c(6,0,6,0), "pt")) + ylab("")

# arrange the three plots in a single row
prow <- plot_grid( p1 + theme(legend.position="none"),
           p2 + theme(legend.position="none"),
           p3 + theme(legend.position="none"),
           align = 'vh',
           labels = c("A", "B", "C"),
           hjust = -1,
           nrow = 1
           )

# extract the legend from one of the plots
# (clearly the whole thing only makes sense if all plots
# have the same legend, so we can arbitrarily pick one.)
legend_b <- get_legend(p1 + theme(legend.position="bottom"))

# add the legend underneath the row we made earlier. Give it 10% of the height
# of one plot (via rel_heights).
p <- plot_grid( prow, legend_b, ncol = 1, rel_heights = c(1, .2))
p

Get startup type of Windows service using PowerShell

Use:

Get-Service BITS | Select StartType

Or use:

(Get-Service -Name BITS).StartType

Then

Set-Service BITS -StartupType xxx

[PowerShell 5.1]

change pgsql port

You can also change the port when starting up:

$ pg_ctl -o "-F -p 5433" start

$ postgres -p 5433

More about this in the manual.

Export to xls using angularjs

$scope.ExportExcel= function () { //function define in html tag                          

                        //export to excel file
                        var tab_text = '<table border="1px" style="font-size:20px" ">';
                        var textRange;
                        var j = 0;
                        var tab = document.getElementById('TableExcel'); // id of table
                        var lines = tab.rows.length;

                        // the first headline of the table
                        if (lines > 0) {
                            tab_text = tab_text + '<tr bgcolor="#DFDFDF">' + tab.rows[0].innerHTML + '</tr>';
                        }

                        // table data lines, loop starting from 1
                        for (j = 1 ; j < lines; j++) {
                            tab_text = tab_text + "<tr>" + tab.rows[j].innerHTML + "</tr>";                                
                        }

                        tab_text = tab_text + "</table>";
                        tab_text = tab_text.replace(/<A[^>]*>|<\/A>/g, "");          //remove if u want links in your table
                        tab_text = tab_text.replace(/<img[^>]*>/gi, "");             // remove if u want images in your table
                        tab_text = tab_text.replace(/<input[^>]*>|<\/input>/gi, ""); // reomves input params

                        // console.log(tab_text); // aktivate so see the result (press F12 in browser)               
                        var fileName = 'report.xls'                            
                        var exceldata = new Blob([tab_text], { type: "application/vnd.ms-excel;charset=utf-8" }) 

                        if (window.navigator.msSaveBlob) { // IE 10+
                            window.navigator.msSaveOrOpenBlob(exceldata, fileName);
                            //$scope.DataNullEventDetails = true;
                        } else {
                            var link = document.createElement('a'); //create link download file
                            link.href = window.URL.createObjectURL(exceldata); // set url for link download
                            link.setAttribute('download', fileName); //set attribute for link created
                            document.body.appendChild(link);
                            link.click();
                            document.body.removeChild(link);
                        }

                    }

        //html of button

Passing properties by reference in C#

The accepted answer is good if that function is in your code and you can modify it. But sometimes you have to use an object and a function from some external library and you can't change the property and function definition. Then you can just use a temporary variable.

var phone = Client.WorkPhone;
GetString(input, ref phone);
Client.WorkPhone = phone;

How can I make an "are you sure" prompt in a Windows batchfile?

Open terminal. Type the following

echo>sure.sh
chmod 700 sure.sh

Paste this inside sure.sh

#!\bin\bash

echo -n 'Are you sure? [Y/n] '
read yn

if [ "$yn" = "n" ]; then
    exit 1
fi

exit 0

Close sure.sh and type this in terminal.

alias sure='~/sure&&'

Now, if you type sure before typing the command it will give you an are you sure prompt before continuing the command.

Hope this is helpful!

Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sierra/Mojave?

Here are the commands to restore the old behavior:

# create a script that calls launchctl iterating through /etc/launchd.conf
echo '#!/bin/sh

while read line || [[ -n $line ]] ; do launchctl $line ; done < /etc/launchd.conf;
' > /usr/local/bin/launchd.conf.sh

# make it executable
chmod +x /usr/local/bin/launchd.conf.sh

# launch the script at startup
echo '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>launchd.conf</string>
  <key>ProgramArguments</key>
  <array>
    <string>sh</string>
    <string>-c</string>
    <string>/usr/local/bin/launchd.conf.sh</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>
' > /Library/LaunchAgents/launchd.conf.plist

Now you can specify commands like setenv JAVA_HOME /Library/Java/Home in /etc/launchd.conf.

Checked on El Capitan.

CodeIgniter: How to use WHERE clause and OR clause

Active record method or_where is to be used:

$this->db->select("*")
->from("table_name")
->where("first", $first)
->or_where("second", $second);

Using comma as list separator with AngularJS

_x000D_

.list-comma::before {_x000D_
  content: ',';_x000D_
}_x000D_
.list-comma:first-child::before {_x000D_
  content: '';_x000D_
}

_x000D_

<span class="list-comma" ng-repeat="destination in destinations">_x000D_
                            {{destination.name}}_x000D_
                        </span>

_x000D_

How do I set up access control in SVN?

Apache Subversion supports path-based authorization that helps you configure granular permissions for user and group accounts on paths in your repositories (files or directories). Path-based authorization supports three access levels - No Access, Read Only and Read / Write.

Path-based authorization permissions are stored in per-repository or per-server authorization files with a special syntax. Here is an example from SVNBook:

[calc:/branches/calc/bug-142]
harry = rw
sally = r

When you require a complex permission structure with many paths and accounts you can benefit from a GUI-based permission management tools provided by VisualSVN Server:

Server administrators can manage user and group permissions via the VisualSVN Server Manager console or PowerShell,
Non-admin users can manage permissions via RepoCfg.

Repository permissions in VisualSVN Server Manager

Repository permissions in PowerShell

Non-admin users can manage permissions via the RepoCfg tool

How can I stop the browser back button using JavaScript?

This code was tested with the latest Chrome and Firefox browsers.

<script type="text/javascript">
    history.pushState(null, null, location.href);
    history.back();
    history.forward();
    window.onpopstate = function () { history.go(1); };
</script>

Count the number of occurrences of a character in a string in Javascript

I made a slight improvement on the accepted answer, it allows to check with case-sensitive/case-insensitive matching, and is a method attached to the string object:

String.prototype.count = function(lit, cis) {
    var m = this.toString().match(new RegExp(lit, ((cis) ? "gi" : "g")));
    return (m != null) ? m.length : 0;
}

lit is the string to search for ( such as 'ex' ), and cis is case-insensitivity, defaulted to false, it will allow for choice of case insensitive matches.

To search the string 'I love StackOverflow.com' for the lower-case letter 'o', you would use:

var amount_of_os = 'I love StackOverflow.com'.count('o');

amount_of_os would be equal to 2.

If we were to search the same string again using case-insensitive matching, you would use:

var amount_of_os = 'I love StackOverflow.com'.count('o', true);

This time, amount_of_os would be equal to 3, since the capital O from the string gets included in the search.

How can I check if the array of objects have duplicate property values?

Use array.prototype.map and array.prototype.some:

var values = [
    { name: 'someName1' },
    { name: 'someName2' },
    { name: 'someName4' },
    { name: 'someName2' }
];

var valueArr = values.map(function(item){ return item.name });
var isDuplicate = valueArr.some(function(item, idx){ 
    return valueArr.indexOf(item) != idx 
});
console.log(isDuplicate);

JSFIDDLE.

Prefer composition over inheritance?

This rule is a complete nonsense. Why?

The reason is that in every case it is possible to tell whether to use composition or inheritance. This is determined by the answer to a question: "IS something A something else" or "HAS something A something else".

You cannot "prefer" to make something to be something else or to have something else. Strict logical rules apply.

Also there are no "contrived examples" because in every situation an answer to this question can be given.

If you cannot answer this question there is something else wrong. This includes overlapping responsibilities of classess which are usually the result of wrong use of interfaces, less often by rewriting same code in different classess.

To avoid this situations I also recommend to use good names for classes , that fully resemble their responsibilities.

Using Case/Switch and GetType to determine the object

I actually prefer the approach given as the answer here: Is there a better alternative than this to 'switch on type'?

There is however a good argument about not implementing any type comparison methids in an object oriented language like C#. You could as an alternative extend and add extra required functionality using inheritance.

This point was discussed in the comments of the authors blog here: http://blogs.msdn.com/b/jaredpar/archive/2008/05/16/switching-on-types.aspx#8553535

I found this an extremely interesting point which changed my approach in a similar situation and only hope this helps others.

Kind Regards, Wayne

Logger slf4j advantages of formatting with {} instead of string concatenation

Short version: Yes it is faster, with less code!

String concatenation does a lot of work without knowing if it is needed or not (the traditional "is debugging enabled" test known from log4j), and should be avoided if possible, as the {} allows delaying the toString() call and string construction to after it has been decided if the event needs capturing or not. By having the logger format a single string the code becomes cleaner in my opinion.

You can provide any number of arguments. Note that if you use an old version of sljf4j and you have more than two arguments to {}, you must use the new Object[]{a,b,c,d} syntax to pass an array instead. See e.g. http://slf4j.org/apidocs/org/slf4j/Logger.html#debug(java.lang.String, java.lang.Object[]).

Regarding the speed: Ceki posted a benchmark a while back on one of the lists.

C - Convert an uppercase letter to lowercase

Use This code

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main(){
char a[10];
clrscr();
gets(a);
int i,length=0;
for(i=0;a[i]!='\0';i++)
length+=1;
for(i=0;i<length;i++){
a[i]=a[i]^32;
}
printf("%s",&a);
getch();
}

Select query to get data from SQL Server

SqlCommand.ExecuteNonQuery Method

You can use the ExecuteNonQuery to perform catalog operations (for example, querying the structure of a database or creating database objects such as tables), or to change the data in a database without using a DataSet by executing UPDATE, INSERT, or DELETE statements. Although the ExecuteNonQuery returns no rows, any output parameters or return values mapped to parameters are populated with data. For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of rows affected by the trigger or triggers. For all other types of statements, the return value is -1. If a rollback occurs, the return value is also -1.

SqlCommand.ExecuteScalar Method Executes a Transact-SQL statement against the connection and returns the number of rows affected.

So to get no. of statements returned by SELECT statement you have to use ExecuteScalar method.

Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery(v=vs.110).aspx

So try below code:

SqlConnection conn = new SqlConnection("Data Source=;Initial Catalog=;Persist Security Info=True;User ID=;Password=");
conn.Open();

SqlCommand command = new SqlCommand("Select id from [table1] where name=@zip", conn);
command.Parameters.AddWithValue("@zip","india");
 // int result = command.ExecuteNonQuery();
using (SqlDataReader reader = command.ExecuteReader())
{
  if (reader.Read())
  {
     Console.WriteLine(String.Format("{0}",reader["id"]));
   }
}

conn.Close();

Excel 2010 VBA - Close file No Save without prompt

If you're not wanting to save changes set savechanges to false

    Sub CloseBook2()
        ActiveWorkbook.Close savechanges:=False
    End Sub

for more examples, http://support.microsoft.com/kb/213428 and i believe in the past I've just used

    ActiveWorkbook.Close False

HttpURLConnection timeout settings

HttpURLConnection has a setConnectTimeout method.

Just set the timeout to 5000 milliseconds, and then catch java.net.SocketTimeoutException

Your code should look something like this:


try {
   HttpURLConnection.setFollowRedirects(false);
   HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
   con.setRequestMethod("HEAD");

   con.setConnectTimeout(5000); //set timeout to 5 seconds

   return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
} catch (java.net.SocketTimeoutException e) {
   return false;
} catch (java.io.IOException e) {
   return false;
}

How to browse localhost on Android device?

If you want to access a server running on your PC from your Android device via your wireless network, first run the command ipconfig on your PC (use run (Windows logo + R), cmd, ipconfig).

Note the IPv4 address: (it should be 192.168.0.x) for some x. Use this as the server IP address, together with the port number, e.g. 192.168.0.7:8080, in your code.

Your Android device will then access the server via your wireless network router.

Change remote repository credentials (authentication) on Intellij IDEA 14

I needed to change my user name and password in Intellij Did it by

preferences -> version control -> GitHub

There you can change user name and password.

How to validate a credit card number

I hope the following two links help to solve your problem.

FYI, various credit cards are available in the world. So, your thought is wrong. Credit cards have some format. See the following links. The first one is pure JavaScript and the second one is using jQuery.

Demo:

_x000D_

function testCreditCard() {_x000D_
  myCardNo = document.getElementById('CardNumber').value;_x000D_
  myCardType = document.getElementById('CardType').value;_x000D_
  if (checkCreditCard(myCardNo, myCardType)) {_x000D_
    alert("Credit card has a valid format")_x000D_
  } else {_x000D_
    alert(ccErrors[ccErrorNo])_x000D_
  };_x000D_
}

_x000D_

<script src="https://www.braemoor.co.uk/software/_private/creditcard.js"></script>_x000D_
_x000D_
<!-- COPIED THE DEMO CODE FROM THE SOURCE WEBSITE (https://www.braemoor.co.uk/software/creditcard.shtml) -->_x000D_
_x000D_
<table>_x000D_
  <tbody>_x000D_
    <tr>_x000D_
      <td style="padding-right: 30px;">American Express</td>_x000D_
      <td>3400 0000 0000 009</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Carte Blanche</td>_x000D_
      <td>3000 0000 0000 04</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Discover</td>_x000D_
      <td>6011 0000 0000 0004</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Diners Club</td>_x000D_
      <td>3852 0000 0232 37</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>enRoute</td>_x000D_
      <td>2014 0000 0000 009</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>JCB</td>_x000D_
      <td>3530 111333300000</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>MasterCard</td>_x000D_
      <td>5500 0000 0000 0004</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Solo</td>_x000D_
      <td>6334 0000 0000 0004</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Switch</td>_x000D_
      <td>4903 0100 0000 0009</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visa</td>_x000D_
      <td>4111 1111 1111 1111</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Laser</td>_x000D_
      <td>6304 1000 0000 0008</td>_x000D_
    </tr>_x000D_
  </tbody>_x000D_
</table>_x000D_
<hr /> Card Number:_x000D_
<select tabindex="11" id="CardType" style="margin-left: 10px;">_x000D_
  <option value="AmEx">American Express</option>_x000D_
  <option value="CarteBlanche">Carte Blanche</option>_x000D_
  <option value="DinersClub">Diners Club</option>_x000D_
  <option value="Discover">Discover</option>_x000D_
  <option value="EnRoute">enRoute</option>_x000D_
  <option value="JCB">JCB</option>_x000D_
  <option value="Maestro">Maestro</option>_x000D_
  <option value="MasterCard">MasterCard</option>_x000D_
  <option value="Solo">Solo</option>_x000D_
  <option value="Switch">Switch</option>_x000D_
  <option value="Visa">Visa</option>_x000D_
  <option value="VisaElectron">Visa Electron</option>_x000D_
  <option value="LaserCard">Laser</option>_x000D_
</select> <input type="text" id="CardNumber" maxlength="24" size="24" style="margin-left: 10px;"> <button id="mybutton" type="button" onclick="testCreditCard();" style="margin-left: 10px; color: #f00;">Check</button>_x000D_
_x000D_
<p style="color: red; font-size: 10px;"> COPIED THE DEMO CODE FROM TEH SOURCE WEBSITE (https://www.braemoor.co.uk/software/creditcard.shtml) </p>

_x000D_

How to convert buffered image to image and vice-versa?

The right way is to use SwingFXUtils.toFXImage(bufferedImage,null) to convert a BufferedImage to a JavaFX Image instance and SwingFXUtils.fromFXImage(image,null) for the inverse operation.

Optionally the second parameter can be a WritableImage to avoid further object allocation.

const to Non-const Conversion in C++

void SomeClass::changeASettingAndCallAFunction() const {
    someSetting = 0; //Can't do this
    someFunctionThatUsesTheSetting();
}

Another solution is to call said function in-between making edits to variables that the const function uses. This idea was what solved my problem being as I was not inclined to change the signature of the function and had to use the "changeASettingAndCallAFunction" method as a mediator:

When you call the function you can first make edits to the setting before the call, or (if you aren't inclined to mess with the invoking place) perhaps call the function where you need the change to the variable to be propagated (like in my case).

void SomeClass::someFunctionThatUsesTheSetting() const {
     //We really don't want to touch this functions implementation
     ClassUsesSetting* classUsesSetting = ClassUsesSetting::PropagateAcrossClass(someSetting);
     /*
         Do important stuff
     */
}

void SomeClass::changeASettingAndCallAFunction() const {
     someFunctionThatUsesTheSetting();
     /*
         Have to do this
     */
}

void SomeClass::nonConstInvoker(){
    someSetting = 0;
    changeASettingAndCallAFunction();
}

Now, when some reference to "someFunctionThatUsesTheSetting" is invoked, it will invoke with the change to someSetting.

SMTP error 554

To resolve problem go to the MDaemon-->setup-->Miscellaneous options-->Server-->SMTP Server Checks commands and headers for RFC Compliance

android pick images from gallery

Sometimes, you can't get a file from the picture you choose. It's because the choosen one came from Google+, Drive, Dropbox or any other provider.

The best solution is to ask the system to pick a content via Intent.ACTION_GET_CONTENT and get the result with a content provider.

You can follow the code bellow or look at my updated gist.

public void pickImage() {
  Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
  intent.setType("image/*");
  startActivityForResult(intent, PICK_PHOTO_FOR_AVATAR);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == PICK_PHOTO_FOR_AVATAR && resultCode == Activity.RESULT_OK) {
        if (data == null) {
            //Display an error
            return;
        }
        InputStream inputStream = context.getContentResolver().openInputStream(data.getData());
        //Now you can do whatever you want with your inpustream, save it as file, upload to a server, decode a bitmap...
    }
}

Mockito. Verify method arguments

Verify(a).aFunc(eq(b))

In pseudocode:

When in the instance a - a function named aFunc is called.

Verify this call got an argument which is equal to b.

The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type or method 'System.Nullable<T>'

For a very specific reason Type Nullable<int> put your cursor on Nullable and hit F12 - The Metadata provides the reason (Note the struct constraint):

public struct Nullable<T> where T : struct
{
...
}

http://msdn.microsoft.com/en-us/library/d5x73970.aspx

How to execute IN() SQL queries with Spring's JDBCTemplate effectively?

Many things changed since 2009, but I can only find answers saying you need to use NamedParametersJDBCTemplate.

For me it works if I just do a

db.query(sql, new MyRowMapper(), StringUtils.join(listeParamsForInClause, ","));

using SimpleJDBCTemplate or JDBCTemplate

I want to truncate a text or line with ellipsis using JavaScript

Easiest and flexible way: JSnippet DEMO

Function style:

function truncString(str, max, add){
   add = add || '...';
   return (typeof str === 'string' && str.length > max ? str.substring(0,max)+add : str);
};

Prototype:

String.prototype.truncString = function(max, add){
   add = add || '...';
   return (this.length > max ? this.substring(0,max)+add : this);
};

Usage:

str = "testing with some string see console output";

//By prototype:
console.log(  str.truncString(15,'...')  );

//By function call:
console.log(  truncString(str,15,'...')  );

UPDATE with CASE and IN - Oracle

There is another workaround you can use to update using a join. This example below assumes you want to de-normalize a table by including a lookup value (in this case storing a users name in the table). The update includes a join to find the name and the output is evaluated in a CASE statement that supports the name being found or not found. The key to making this work is ensuring all the columns coming out of the join have unique names. In the sample code, notice how b.user_name conflicts with the a.user_name column and must be aliased with the unique name "user_user_name".

UPDATE
(
    SELECT a.user_id, a.user_name, b.user_name as user_user_name
    FROM some_table a
    LEFT OUTER JOIN user_table b ON a.user_id = b.user_id
    WHERE a.user_id IS NOT NULL
)
SET user_name = CASE
    WHEN user_user_name IS NOT NULL THEN user_user_name
    ELSE 'UNKNOWN'
    END;

What is the purpose of Android's <merge> tag in XML layouts?

Another reason to use merge is when using custom viewgroups in ListViews or GridViews. Instead of using the viewHolder pattern in a list adapter, you can use a custom view. The custom view would inflate an xml whose root is a merge tag. Code for adapter:

public class GridViewAdapter extends BaseAdapter {
     // ... typical Adapter class methods
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
        WallpaperView wallpaperView;
        if (convertView == null)
           wallpaperView = new WallpaperView(activity);
        else
            wallpaperView = (WallpaperView) convertView;

        wallpaperView.loadWallpaper(wallpapers.get(position), imageWidth);
        return wallpaperView;
    }
}

here is the custom viewgroup:

public class WallpaperView extends RelativeLayout {

    public WallpaperView(Context context) {
        super(context);
        init(context);
    }
    // ... typical constructors

    private void init(Context context) {
        View.inflate(context, R.layout.wallpaper_item, this);
        imageLoader = AppController.getInstance().getImageLoader();
        imagePlaceHolder = (ImageView) findViewById(R.id.imgLoader2);
        thumbnail = (NetworkImageView) findViewById(R.id.thumbnail2);
        thumbnail.setScaleType(ImageView.ScaleType.CENTER_CROP);
    }

    public void loadWallpaper(Wallpaper wallpaper, int imageWidth) {
        // ...some logic that sets the views
    }
}

and here is the XML:

<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView
        android:id="@+id/imgLoader"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_centerInParent="true"
        android:src="@drawable/ico_loader" />

    <com.android.volley.toolbox.NetworkImageView
        android:id="@+id/thumbnail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</merge>

How do I change file permissions in Ubuntu

If you just want to change file permissions, you want to be careful about using -R on chmod since it will change anything, files or folders. If you are doing a relative change (like adding write permission for everyone), you can do this:

sudo chmod -R a+w /var/www

But if you want to use the literal permissions of read/write, you may want to select files versus folders:

sudo find /var/www -type f -exec chmod 666 {} \;

(Which, by the way, for security reasons, I wouldn't recommend either of these.)

Or for folders:

sudo find /var/www -type d -exec chmod 755 {} \;

Explain ggplot2 warning: "Removed k rows containing missing values"

Just for the shake of completing the answer given by eipi10.

I was facing the same problem, without using scale_y_continuous nor coord_cartesian.

The conflict was coming from the x axis, where I defined limits = c(1, 30). It seems such limits do not provide enough space if you want to "dodge" your bars, so R still throws the error

Removed 8 rows containing missing values (geom_bar)

Adjusting the limits of the x axis to limits = c(0, 31) solved the problem.

In conclusion, even if you are not putting limits to your y axis, check out your x axis' behavior to ensure you have enough space

Maven: how to override the dependency added by a library

What you put inside the </dependencies> tag of the root pom will be included by all child modules of the root pom. If all your modules use that dependency, this is the way to go.

However, if only 3 out of 10 of your child modules use some dependency, you do not want this dependency to be included in all your child modules. In that case, you can just put the dependency inside the </dependencyManagement>. This will make sure that any child module that needs the dependency must declare it in their own pom file, but they will use the same version of that dependency as specified in your </dependencyManagement> tag.

You can also use the </dependencyManagement> to modify the version used in transitive dependencies, because the version declared in the upper most pom file is the one that will be used. This can be useful if your project A includes an external project B v1.0 that includes another external project C v1.0. Sometimes it happens that a security breach is found in project C v1.0 which is corrected in v1.1, but the developers of B are slow to update their project to use v1.1 of C. In that case, you can simply declare a dependency on C v1.1 in your project's root pom inside `, and everything will be good (assuming that B v1.0 will still be able to compile with C v1.1).

How to change the font size and color of x-axis and y-axis label in a scatterplot with plot function in R?

Taking DWins example.

What I often do, particularly when I use many, many different plots with the same colours or size information, is I store them in variables I otherwise never use. This helps me keep my code a little cleaner AND I can change it "globally".

E.g.

clab = 1.5
cmain = 2
caxis = 1.2

plot(1, 1 ,xlab="x axis", ylab="y axis",  pch=19,
           col.lab="red", cex.lab=clab,    
           col="green", main = "Testing scatterplots", cex.main =cmain, cex.axis=caxis)

You can also write a function, doing something similar. But for a quick shot this is ideal. You can also store that kind of information in an extra script, so you don't have a messy plot script:

which you then call with setwd("") source("plotcolours.r")

in a file say called plotcolours.r you then store all the e.g. colour or size variables

clab = 1.5
cmain = 2
caxis = 1.2

for colours could use

darkred<-rgb(113,28,47,maxColorValue=255)

as your variable 'darkred' now has the colour information stored, you can access it in your actual plotting script.

plot(1,1,col=darkred)

tar: file changed as we read it

Here is a one-liner for ignoring the tar exit status if it is 1. There is no need to set +e as in sandeep's script. If the tar exit status is 0 or 1, this one-liner will return with exit status 0. Otherwise it will return with exit status 1. This is different from sandeep's script where the original exit status value is preserved if it is different from 1.

tar -czf sample.tar.gz dir1 dir2 || [[ $? -eq 1 ]]

apache and httpd running but I can't see my website

Did you restart the server after you changed the config file?

Can you telnet to the server from a different machine?

Can you telnet to the server from the server itself?

telnet <ip address> 80

telnet localhost 80

How can I make a time delay in Python?

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

Safari 3rd party cookie iframe trick no longer working?

Let me share my fix in ASP.NET MVC 4. The main idea like in correct answer for PHP. The next code added in main Layout in header near scripts section:

@if (Request.Browser.Browser=="Safari")
{
    string pageUrl = Request.Url.GetLeftPart(UriPartial.Path);
    if (Request.Params["safarifix"] != null && Request.Params["safarifix"] == "doSafariFix")
    {
        Session["IsActiveSession"] = true;
        Response.Redirect(pageUrl);
        Response.End();
    }
        else if(Session["IsActiveSession"]==null)
    {
        <script>top.window.location = "?safarifix=doSafariFix";</script>
    }
}

How to set javascript variables using MVC4 with Razor

This should cover all major types:

public class ViewBagUtils
{
    public static string ToJavascriptValue(dynamic val)
    {
        if (val == null) return "null";
        if (val is string) return val;
        if (val is bool) return val.ToString().ToLower();
        if (val is DateTime) return val.ToString();
        if (double.TryParse(val.ToString(), out double dval)) return dval.ToString();

        throw new ArgumentException("Could not convert value.");
    }
}

And in your .cshtml file inside the <script> tag:

@using Namespace_Of_ViewBagUtils
const someValue = @ViewBagUtils.ToJavascriptValue(ViewBag.SomeValue);

Note that for string values, you'll have to use the @ViewBagUtils expression inside single (or double) quotes, like so:

const someValue = "@ViewBagUtils.ToJavascriptValue(ViewBag.SomeValue)";

Reading RFID with Android phones

A UHF RFID reader option for both Android and iOS is available from a company called U Grok It.

It is just UHF, which is "non-NFC enabled Android", if that's what you meant. My apologies if you meant an NFC reader for Android devices that don't have an NFC reader built-in.

Their reader has a range up to 7 meters (~21 feet). It connects via the audio port, not bluetooth, which has the advantage of pairing instantly, securely, and with way less of a power draw.

They have a free native SDK for Android, iOS, Cordova, and Xamarin, as well as an Android keyboard wedge.

Getting input values from text box

// NOTE: Using "this.pass" and "this.name" will create a global variable even though it is inside the function, so be weary of your naming convention

function submit()
{
    var userPass = document.getElementById("pass").value;
    var userName = document.getElementById("user").value;
    this.pass = userPass;
    this.name = userName; 
    alert("whatever you want to display"); 
}

Letsencrypt add domain to existing certificate

this worked for me

 sudo letsencrypt certonly -a webroot --webroot-path=/var/www/html -d
 domain.com -d www.domain.com

Get the Query Executed in Laravel 3/4

The Loic Sharma SQL profiler does support Laravel 4, I just installed it. The instructions are listed here. The steps are the following:

Add "loic-sharma/profiler": "1.1.*" in the require section in composer.json
Perform self-update => php composer.phar self-update in the console.
Perform composer update => php composer.phar update loic-sharma/profiler in the console as well `
Add 'Profiler\ProfilerServiceProvider', in the provider array in app.php
Add 'Profiler' => 'Profiler\Facades\Profiler', in the aliasses array in app.php as well
Run php artisan config:publish loic-sharma/profiler in the console

Error In PHP5 ..Unable to load dynamic library

I had enabled the extension_dir in php.ini by uncommenting,

  extension_dir = "ext"
  extension=phpchartdir550.dll

and copying phpchartdir550 dll to the extension_dir (/usr/lib/php5/20121212), resulted in the same error.

  PHP Warning:  PHP Startup: Unable to load dynamic library 'ext/phpchartdir550.dll' - ext/phpchartdir550.dll: cannot open shared object file: No such file or directory in Unknown on line 0
  PHP Warning:  PHP Startup: Unable to load dynamic library 'ext/pdo.so' - ext/pdo.so: cannot open shared object file: No such file or directory in Unknown on line 0
  PHP Warning:  PHP Startup: Unable to load dynamic library 'ext/gd.so' - ext/gd.so: cannot open shared object file: No such file or directory in Unknown on line 0

As @Mike pointed out, it is not necessary to install all the stuff when they are not actually required in the application.

The easier way is to provide the full path to the extensions to be loaded after copying the libraries to the correct location.

Copy phpchartdir550.dll to /usr/lib/php5/20121212, which is the extension_dir in my Ubuntu 14.04 (this can be seen using phpinfo()) and then provide full path to the library in php.ini,

;   extension=/path/to/extension/msql.so
extension=/usr/lib/php5/20121212/phpchartdir550.dll

restart apache: sudo service apache2 restart

even though other .so's are present in the same directory, only the required ones can be selectively loaded.

Angular 2 router.navigate

_x000D_

import { ActivatedRoute } from '@angular/router';_x000D_
_x000D_
export class ClassName {_x000D_
  _x000D_
  private router = ActivatedRoute;_x000D_
_x000D_
    constructor(r: ActivatedRoute) {_x000D_
        this.router =r;_x000D_
    }_x000D_
_x000D_
onSuccess() {_x000D_
     this.router.navigate(['/user_invitation'],_x000D_
         {queryParams: {email: loginEmail, code: userCode}});_x000D_
}_x000D_
_x000D_
}_x000D_
_x000D_
_x000D_
Get this values:_x000D_
---------------_x000D_
_x000D_
ngOnInit() {_x000D_
    this.route_x000D_
        .queryParams_x000D_
        .subscribe(params => {_x000D_
            let code = params['code'];_x000D_
            let userEmail = params['email'];_x000D_
        });_x000D_
}

_x000D_

Ref: https://angular.io/docs/ts/latest/api/router/index/NavigationExtras-interface.html

sql - insert into multiple tables in one query

I had the same problem. I solve it with a for loop.

Example:

If I want to write in 2 identical tables, using a loop

for x = 0 to 1

 if x = 0 then TableToWrite = "Table1"
 if x = 1 then TableToWrite = "Table2"
  Sql = "INSERT INTO " & TableToWrite & " VALUES ('1','2','3')"
NEXT

either

ArrTable = ("Table1", "Table2")

for xArrTable = 0 to Ubound(ArrTable)
 Sql = "INSERT INTO " & ArrTable(xArrTable) & " VALUES ('1','2','3')"
NEXT

If you have a small query I don't know if this is the best solution, but if you your query is very big and it is inside a dynamical script with if/else/case conditions this is a good solution.

DIV table colspan: how?

Trying to think in tableless design does not mean that you can not use tables :)

It is only that you can think of it that tabular data can be presented in a table, and that other elements (mostly div's) are used to create the layout of the page.

So I should say that you have to read some information on styling with div-elements, or use this page as a good example page!

Good luck ;)

Laravel redirect back to original destination after login

Laravel now supports this feature out-of-the-box! (I believe since 5.5 or earlier).

Add a __construct() method to your Controller as shown below:

public function __construct()
{
    $this->middleware('auth');
}

After login, your users will then be redirected to the page they intended to visit initially.

You can also add Laravel's email verification feature as required by your application logic:

public function __construct()
{
    $this->middleware(['auth', 'verified']);
}

The documentation contains a very brief example:

https://laravel.com/docs/5.8/authentication#protecting-routes

It's also possible to choose which controller's methods the middleware applies to by using except or only options.

Example with except:

public function __construct()
{
    $this->middleware('auth', ['except' => ['index', 'show']]);
}

Example with only:

public function __construct()
{
    $this->middleware('auth', ['only' => ['index', 'show']]);
}

More information about except and only middleware options:

https://laravel.com/api/5.8/Illuminate/Routing/ControllerMiddlewareOptions.html#method_except

generate a random number between 1 and 10 in c

Generating a single random number in a program is problematic. Random number generators are only "random" in the sense that repeated invocations produce numbers from a given probability distribution.

Seeding the RNG won't help, especially if you just seed it from a low-resolution timer. You'll just get numbers that are a hash function of the time, and if you call the program often, they may not change often. You might improve a little bit by using srand(time(NULL) + getpid()) (_getpid() on Windows), but that still won't be random.

The ONLY way to get numbers that are random across multiple invocations of a program is to get them from outside the program. That means using a system service such as /dev/random (Linux) or CryptGenRandom() (Windows), or from a service like random.org.

Write Base64-encoded image to file

No need to use BufferedImage, as you already have the image file in a byte array

    byte dearr[] = Base64.decodeBase64(crntImage);
    FileOutputStream fos = new FileOutputStream(new File("c:/decode/abc.bmp")); 
    fos.write(dearr); 
    fos.close();

MySQL CREATE TABLE IF NOT EXISTS in PHPmyadmin import

Depending on what you want to accomplish, you might replace INSERT with INSERT IGNORE in your file. This will avoid generating an error for the rows that you are trying to insert and already exist.

See http://dev.mysql.com/doc/refman/5.5/en/insert.html.

Calling a parent window function from an iframe

With Firefox and Chrome you can use :

<a href="whatever" target="_parent" onclick="myfunction()">

If myfunction is present both in iframe and in parent, the parent one will be called.

How to set focus on an input field after rendering?

According to the updated syntax, you can use this.myRref.current.focus()

Java OCR implementation

There are a variety of OCR libraries out there. However, my experience is that the major commercial implementations, ABBYY, Omnipage, and ReadIris, far outdo the open-source or other minor implementations. These commercial libraries are not primarily designed to work with Java, though of course it is possible.

Of course, if your interest is to learn the code, the open-source implementations will do the trick.

How do I check if PHP is connected to a database already?

Baron Schwartz blogs that due to race conditions, this 'check before write' is a bad practice. He advocates a try/catch pattern with a reconnect in the catch. Here is the pseudo code he recommends:

function query_database(connection, sql, retries=1)
   while true
      try
         result=connection.execute(sql)
         return result
      catch InactiveConnectionException e
         if retries > 0 then
            retries = retries - 1
            connection.reconnect()
         else
            throw e
         end
      end
   end
end

Here is his full blog: https://www.percona.com/blog/2010/05/05/checking-for-a-live-database-connection-considered-harmful/

SSH SCP Local file to Remote in Terminal Mac Os X

Just to clarify the answer given by JScoobyCed, the scp command cannot copy files to directories that require administrative permission. However, you can use the scp command to copy to directories that belong to the remote user.

So, to copy to a directory that requires root privileges, you must first copy that file to a directory belonging to the remote user using the scp command. Next, you must login to the remote account using ssh. Once logged in, you can then move the file to the directory of your choosing by using the sudo mv command. In short, the commands to use are as follows:

Using scp, copy file to a directory in the remote user's account, for example the Documents directory:

scp /path/to/your/local/file remoteUser@some_address:/home/remoteUser/Documents

Next, login to the remote user's account using ssh and then move the file to a restricted directory using sudo:

ssh remoteUser@some_address
sudo mv /home/remoteUser/Documents/file /var/www

How to allow CORS in react.js?

there are 6 ways to do this in React,

number 1 and 2 and 3 are the best:

1-config CORS in the Server-Side

2-set headers manually like this:

resonse_object.header("Access-Control-Allow-Origin", "*");
resonse_object.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

3-config NGINX for proxy_pass which is explained here.

4-bypass the Cross-Origin-Policy with chrom extension(only for development and not recommended !)

5-bypass the cross-origin-policy with URL bellow(only for development)

"https://cors-anywhere.herokuapp.com/{type_your_url_here}"

6-use proxy in your package.json file:(only for development)

if this is your API: http://45.456.200.5:7000/api/profile/

add this part in your package.json file: "proxy": "http://45.456.200.5:7000/",

and then make your request with the next parts of the api:

React.useEffect(() => {
    axios
        .get('api/profile/')
        .then(function (response) {
            console.log(response);
        })
        .catch(function (error) {
            console.log(error);
        });
});

How to properly use unit-testing's assertRaises() with NoneType objects?

Complete snippet would look like the following. It expands @mouad's answer to asserting on error's message (or generally str representation of its args), which may be useful.

from unittest import TestCase


class TestNoneTypeError(TestCase):

  def setUp(self): 
    self.testListNone = None

  def testListSlicing(self):
    with self.assertRaises(TypeError) as ctx:
        self.testListNone[:1]
    self.assertEqual("'NoneType' object is not subscriptable", str(ctx.exception))

MVC 4 Razor File Upload

View Page

@using (Html.BeginForm("ActionmethodName", "ControllerName", FormMethod.Post, new { id = "formid" }))
 { 
   <input type="file" name="file" />
   <input type="submit" value="Upload" class="save" id="btnid" />
 }

script file

$(document).on("click", "#btnid", function (event) {
        event.preventDefault();
        var fileOptions = {
            success: res,
            dataType: "json"
        }
        $("#formid").ajaxSubmit(fileOptions);
    });

In Controller

    [HttpPost]
    public ActionResult UploadFile(HttpPostedFileBase file)
    {

    }

Android - Spacing between CheckBox and text

I don't know guys, but I tested

<CheckBox android:paddingLeft="8mm" and only moves the text to the right, not entire control.

It suits me fine.

How to run python script on terminal (ubuntu)?

Set the PATH as below:

In the csh shell - type setenv PATH "$PATH:/usr/local/bin/python" and press Enter.

In the bash shell (Linux) - type export PATH="$PATH:/usr/local/bin/python" and press Enter.

In the sh or ksh shell - type PATH="$PATH:/usr/local/bin/python" and press Enter.

Note - /usr/local/bin/python is the path of the Python directory

now run as below:

-bash-4.2$ python test.py

Hello, Python!

iOS: How to store username/password within an app?

For swift you can use this library:

https://github.com/jrendel/SwiftKeychainWrapper

It supports all versions of swift.

Difference between an API and SDK

Application Programming Interface is a set of routines/data structures/classes which specifies a way to interact with the target platform/software like OS X, Android, project management application, virtualization software etc.

While Software Development Kit is a wrapper around API/s that makes the job easy for developers.

For example, Android SDK facilitates developers to interact with the Android platform as a whole while the platform itself is built by composite software components communicating via APIs.

Also, sometimes SDKs are built to facilitate development in a specific programming language. For example, Selenium web driver (built in Java) provides APIs to drive any browser natively, while capybara can be considered an an SDK that facilitates Ruby developers to use Selenium web driver. However, Selenium web driver is also an SDK by itself as it combines interaction with various native browser drivers into one package.

Why can't decimal numbers be represented exactly in binary?

BCD - Binary-coded Decimal - representations are exact. They are not very space-efficient, but that's a trade-off you have to make for accuracy in this case.

Is there a way to iterate over a dictionary?

This is iteration using block approach:

    NSDictionary *dict = @{@"key1":@1, @"key2":@2, @"key3":@3};

    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        NSLog(@"%@->%@",key,obj);
        // Set stop to YES when you wanted to break the iteration.
    }];

With autocompletion is very fast to set, and you do not have to worry about writing iteration envelope.

How do I get the application exit code from a Windows command line?

At one point I needed to accurately push log events from Cygwin to the Windows Event log. I wanted the messages in WEVL to be custom, have the correct exit code, details, priorities, message, etc. So I created a little Bash script to take care of this. Here it is on GitHub, logit.sh.

Some excerpts:

usage: logit.sh [-h] [-p] [-i=n] [-s] <description>
example: logit.sh -p error -i 501 -s myscript.sh "failed to run the mount command"

Here is the temporary file contents part:

LGT_TEMP_FILE="$(mktemp --suffix .cmd)"
cat<<EOF>$LGT_TEMP_FILE
    @echo off
    set LGT_EXITCODE="$LGT_ID"
    exit /b %LGT_ID%
EOF
unix2dos "$LGT_TEMP_FILE"

Here is a function to to create events in WEVL:

__create_event () {
    local cmd="eventcreate /ID $LGT_ID /L Application /SO $LGT_SOURCE /T $LGT_PRIORITY /D "
    if [[ "$1" == *';'* ]]; then
        local IFS=';'
        for i in "$1"; do
            $cmd "$i" &>/dev/null
        done
    else
        $cmd "$LGT_DESC" &>/dev/null
    fi
}

Executing the batch script and calling on __create_event:

cmd /c "$(cygpath -wa "$LGT_TEMP_FILE")"
__create_event

How do I get and set Environment variables in C#?

I ran into this while working on a .NET console app to read the PATH environment variable, and found that using System.Environment.GetEnvironmentVariable will expand the environment variables automatically.

I didn't want that to happen...that means folders in the path such as '%SystemRoot%\system32' were being re-written as 'C:\Windows\system32'. To get the un-expanded path, I had to use this:

string keyName = @"SYSTEM\CurrentControlSet\Control\Session Manager\Environment\";
string existingPathFolderVariable = (string)Registry.LocalMachine.OpenSubKey(keyName).GetValue("PATH", "", RegistryValueOptions.DoNotExpandEnvironmentNames);

Worked like a charm for me.

How to add smooth scrolling to Bootstrap's scroll spy function

What onetrickpony posted is okay, but if you want to have a more general solution, you can just use the code below.

Instead of selecting just the id of the anchor, you can make it bit more standard-like and just selecting the attribute name of the <a>-Tag. This will save you from writing an extra id tag. Just add the smoothscroll class to the navbar element.

What changed

1) $('#nav ul li a[href^="#"]') to $('#nav.smoothscroll ul li a[href^="#"]')

2) $(this.hash) to $('a[name="' + this.hash.replace('#', '') + '"]')

Final Code

/* Enable smooth scrolling on all links with anchors */
$('#nav.smoothscroll ul li a[href^="#"]').on('click', function(e) {

  // prevent default anchor click behavior
  e.preventDefault();

  // store hash
  var hash = this.hash;

  // animate
  $('html, body').animate({
    scrollTop: $('a[name="' + this.hash.replace('#', '') + '"]').offset().top
  }, 300, function(){

    // when done, add hash to url
    // (default click behaviour)
    window.location.hash = hash;

  });
});

Getting hold of the outer class object from the inner class object

Within the inner class itself, you can use OuterClass.this. This expression, which allows to refer to any lexically enclosing instance, is described in the JLS as Qualified this.

I don't think there's a way to get the instance from outside the code of the inner class though. Of course, you can always introduce your own property:

public OuterClass getOuter() {
    return OuterClass.this;
}

EDIT: By experimentation, it looks like the field holding the reference to the outer class has package level access - at least with the JDK I'm using.

EDIT: The name used (this$0) is actually valid in Java, although the JLS discourages its use:

The $ character should be used only in mechanically generated source code or, rarely, to access pre-existing names on legacy systems.

How does autowiring work in Spring?

First, and most important - all Spring beans are managed - they "live" inside a container, called "application context".

Second, each application has an entry point to that context. Web applications have a Servlet, JSF uses a el-resolver, etc. Also, there is a place where the application context is bootstrapped and all beans - autowired. In web applications this can be a startup listener.

Autowiring happens by placing an instance of one bean into the desired field in an instance of another bean. Both classes should be beans, i.e. they should be defined to live in the application context.

What is "living" in the application context? This means that the context instantiates the objects, not you. I.e. - you never make new UserServiceImpl() - the container finds each injection point and sets an instance there.

In your controllers, you just have the following:

@Controller // Defines that this class is a spring bean
@RequestMapping("/users")
public class SomeController {

    // Tells the application context to inject an instance of UserService here
    @Autowired
    private UserService userService;

    @RequestMapping("/login")
    public void login(@RequestParam("username") String username,
           @RequestParam("password") String password) {

        // The UserServiceImpl is already injected and you can use it
        userService.login(username, password);

    }
}

A few notes:

In your applicationContext.xml you should enable the <context:component-scan> so that classes are scanned for the @Controller, @Service, etc. annotations.
The entry point for a Spring-MVC application is the DispatcherServlet, but it is hidden from you, and hence the direct interaction and bootstrapping of the application context happens behind the scene.
UserServiceImpl should also be defined as bean - either using <bean id=".." class=".."> or using the @Service annotation. Since it will be the only implementor of UserService, it will be injected.
Apart from the @Autowired annotation, Spring can use XML-configurable autowiring. In that case all fields that have a name or type that matches with an existing bean automatically get a bean injected. In fact, that was the initial idea of autowiring - to have fields injected with dependencies without any configuration. Other annotations like @Inject, @Resource can also be used.

Replace invalid values with None in Pandas DataFrame

where is probably what you're looking for. So

data=data.where(data=='-', None)

From the panda docs:

where [returns] an object of same shape as self and whose corresponding entries are from self where cond is True and otherwise are from other).

what is the difference between uint16_t and unsigned short int incase of 64 bit processor?

uint16_t is unsigned 16-bit integer.

unsigned short int is unsigned short integer, but the size is implementation dependent. The standard only says it's at least 16-bit (i.e, minimum value of UINT_MAX is 65535). In practice, it usually is 16-bit, but you can't take that as guaranteed.

Note:

If you want a portable unsigned 16-bit integer, use uint16_t.
inttypes.h and stdint.h are both introduced in C99. If you are using C89, define your own type.
uint16_t may not be provided in certain implementation(See reference below), but unsigned short int is always available.

Reference: C11(ISO/IEC 9899:201x) §7.20 Integer types

For each type described herein that the implementation provides) shall declare that typedef name and define the associated macros. Conversely, for each type described herein that the implementation does not provide, shall not declare that typedef name nor shall it define the associated macros. An implementation shall provide those types described as ‘‘required’’, but need not provide any of the others (described as ‘optional’’).

Understanding Matlab FFT example

It sounds like you need to some background reading on what an FFT is (e.g. http://en.wikipedia.org/wiki/FFT). But to answer your questions:

Why does the x-axis (frequency) end at 500?

Because the input vector is length 1000. In general, the FFT of a length-N input waveform will result in a length-N output vector. If the input waveform is real, then the output will be symmetrical, so the first 501 points are sufficient.

Edit: (I didn't notice that the example padded the time-domain vector.)

The frequency goes to 500 Hz because the time-domain waveform is declared to have a sample-rate of 1 kHz. The Nyquist sampling theorem dictates that a signal with sample-rate fs can support a (real) signal with a maximum bandwidth of fs/2.

How do I know the frequencies are between 0 and 500?

See above.

Shouldn't the FFT tell me, in which limits the frequencies are?

No.

Does the FFT only return the amplitude value without the frequency?

The FFT simply assigns an amplitude (and phase) to every frequency bin.

R memory management / cannot allocate vector of size n Mb

I encountered a similar problem, and I used 2 flash drives as 'ReadyBoost'. The two drives gave additional 8GB boost of memory (for cache) and it solved the problem and also increased the speed of the system as a whole. To use Readyboost, right click on the drive, go to properties and select 'ReadyBoost' and select 'use this device' radio button and click apply or ok to configure.

How to create a sleep/delay in nodejs that is Blocking?

It's pretty trivial to implement with native addon, so someone did that: https://github.com/ErikDubbelboer/node-sleep.git

Excel VBA - Pass a Row of Cell Values to an Array and then Paste that Array to a Relative Reference of Cells

Since you are copying tha same data to all rows, you don't actually need to loop at all. Try this:

Sub ARRAYER()
    Dim Number_of_Sims As Long
    Dim rng As Range

    Application.Calculation = xlCalculationManual
    Application.ScreenUpdating = False
    Number_of_Sims = 100000

    Set rng = Range("C4:G4")
    rng.Offset(1, 0).Resize(Number_of_Sims) = rng.Value

    Application.Calculation = xlCalculationAutomatic
    Application.ScreenUpdating = True
End Sub

Create normal zip file programmatically

Here's some code I wrote after using the above posts. Thanks for all your help.

This code accepts a list of file paths and creates a zip file out of them.

public class Zip
{
    private string _filePath;
    public string FilePath { get { return _filePath; } }

    /// <summary>
    /// Zips a set of files
    /// </summary>
    /// <param name="filesToZip">A list of filepaths</param>
    /// <param name="sZipFileName">The file name of the new zip (do not include the file extension, nor the full path - just the name)</param>
    /// <param name="deleteExistingZip">Whether you want to delete the existing zip file</param>
    /// <remarks>
    /// Limitation - all files must be in the same location. 
    /// Limitation - must have read/write/edit access to folder where first file is located.
    /// Will throw exception if the zip file already exists and you do not specify deleteExistingZip
    /// </remarks>
    public Zip(List<string> filesToZip, string sZipFileName, bool deleteExistingZip = true)
    {
        if (filesToZip.Count > 0)
        {
            if (File.Exists(filesToZip[0]))
            {

                // Get the first file in the list so we can get the root directory
                string strRootDirectory = Path.GetDirectoryName(filesToZip[0]);

                // Set up a temporary directory to save the files to (that we will eventually zip up)
                DirectoryInfo dirTemp = Directory.CreateDirectory(strRootDirectory + "/" + DateTime.Now.ToString("yyyyMMddhhmmss"));

                // Copy all files to the temporary directory
                foreach (string strFilePath in filesToZip)
                {
                    if (!File.Exists(strFilePath))
                    {
                        throw new Exception(string.Format("File {0} does not exist", strFilePath));
                    }
                    string strDestinationFilePath = Path.Combine(dirTemp.FullName, Path.GetFileName(strFilePath));
                    File.Copy(strFilePath, strDestinationFilePath);
                }

                // Create the zip file using the temporary directory
                if (!sZipFileName.EndsWith(".zip")) { sZipFileName += ".zip"; }
                string strZipPath = Path.Combine(strRootDirectory, sZipFileName);
                if (deleteExistingZip == true && File.Exists(strZipPath)) { File.Delete(strZipPath); }
                ZipFile.CreateFromDirectory(dirTemp.FullName, strZipPath, CompressionLevel.Fastest, false);

                // Delete the temporary directory
                dirTemp.Delete(true);

                _filePath = strZipPath;                    
            }
            else
            {
                throw new Exception(string.Format("File {0} does not exist", filesToZip[0]));
            }
        }
        else
        {
            throw new Exception("You must specify at least one file to zip.");
        }
    }
}

Export data from Chrome developer tool

In more modern versions of Chrome you can just drag a .har file into the network tab of Chrome Dev Tools to load it.

How can I de-install a Perl module installed via `cpan`?

Install App::cpanminus from CPAN (use: cpan App::cpanminus for this).
Type cpanm --uninstall Module::Name (note the "m") to uninstall the module with cpanminus.

This should work.

java.lang.UnsupportedClassVersionError: Bad version number in .class file?

i solved this problem by changing jre required for server (in my case is tomcat). From Server tab in eclipse, double click on the server (in order to open page for server configuration), click on Runtime environment, then change JRE required

Count number of 1's in binary representation

That will be the shortest answer in my SO life: lookup table.

Apparently, I need to explain a bit: "if you have enough memory to play with" means, we've got all the memory we need (nevermind technical possibility). Now, you don't need to store lookup table for more than a byte or two. While it'll technically be O(log(n)) rather than O(1), just reading a number you need is O(log(n)), so if that's a problem, then the answer is, impossible—which is even shorter.

Which of two answers they expect from you on an interview, no one knows.

There's yet another trick: while engineers can take a number and talk about O(log(n)), where n is the number, computer scientists will say that actually we're to measure running time as a function of a length of an input, so what engineers call O(log(n)) is actually O(k), where k is the number of bytes. Still, as I said before, just reading a number is O(k), so there's no way we can do better than that.

What is an efficient way to implement a singleton pattern in Java?

Wikipedia has some examples of singletons, also in Java. The Java 5 implementation looks pretty complete, and is thread-safe (double-checked locking applied).

cmake and libpthread

@Manuel was part way there. You can add the compiler option as well, like this:

If you have CMake 3.1.0+, this becomes even easier:

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(my_app PRIVATE Threads::Threads)

If you are using CMake 2.8.12+, you can simplify this to:

find_package(Threads REQUIRED)
if(THREADS_HAVE_PTHREAD_ARG)
  target_compile_options(my_app PUBLIC "-pthread")
endif()
if(CMAKE_THREAD_LIBS_INIT)
  target_link_libraries(my_app "${CMAKE_THREAD_LIBS_INIT}")
endif()

Older CMake versions may require:

find_package(Threads REQUIRED)
if(THREADS_HAVE_PTHREAD_ARG)
  set_property(TARGET my_app PROPERTY COMPILE_OPTIONS "-pthread")
  set_property(TARGET my_app PROPERTY INTERFACE_COMPILE_OPTIONS "-pthread")
endif()
if(CMAKE_THREAD_LIBS_INIT)
  target_link_libraries(my_app "${CMAKE_THREAD_LIBS_INIT}")
endif()

If you want to use one of the first two methods with CMake 3.1+, you will need set(THREADS_PREFER_PTHREAD_FLAG ON) there too.

Why are there two ways to unstage a file in Git?

It would seem to me that git rm --cached <file> removes the file from the index without removing it from the directory where a plain git rm <file> would do both, just as an OS rm <file> would remove the file from the directory without removing its versioning.

Capture iOS Simulator video for App Preview

You should use QuickTime in Yosemite to connect and record the screen of your iOS devices.

iPhone Portrait

When you finished the recording, you can use iMovie to edit the video. When you're working on an iPhone Portrait App Preview, the resolution must be 1080x1920 but iMovie can only export in 16:9 (1920x1080).

One solution would be to imported the recorded video with the resolution 1080x1920 and rotate it 90 degree. Then export the movie at 1920x1080 and rotate the exported video back 90 degrees using ffmpeg and the following command

ffmpeg -i Landscape.mp4 -vf "transpose=1" Portrait.mp4

iPad

The iPad is a little bit trickier because it requires a resolution of 1200x900 (4:3) but iMovie only exports in 16:9.

Here is what I've done.

Record the movie on iPad Air in Landscape (1200x900, 4:3)
Import into iMovie and export as 1920x1080, 16:9 (iPadLandscape16_9-1920x1080.mp4)

Remove left and right black bars to a video with 1440x1080. The width of one bar is 240

ffmpeg -i iPadLandscape16_9-1920x1080.mp4 -filter:v "crop=1440:1080:240:0" -c:a copy iPadLandscape4_3-1440x1080.mp4

Scale down movie to 1220x900

ffmpeg -i iPadLandscape4_3-1440x1080.mp4 -filter:v scale=1200:-1 -c:a copy iPadLandscape4_3-1200x900.mp4

Taken from my answer on the Apple Developer Forum

Hibernate error - QuerySyntaxException: users is not mapped [from users]

I was getting the same error while Spring with hibernate..I was using "user" in the lowercase in my createQuery statement and my class was User..So changed it to User in my query and problem was solved.

Query before:

Query query= em.createQuery("select u from user u where u.username=:usr AND u.password=:pass",User.class);

Query after:

Query query= em.createQuery("select u from User u where u.username=:usr AND u.password=:pass",User.class);

Checking oracle sid and database name

I presume SELECT user FROM dual; should give you the current user

and SELECT sys_context('userenv','instance_name') FROM dual; the name of the instance

I believe you can get SID as SELECT sys_context('USERENV', 'SID') FROM DUAL;

Add to integers in a list

fooList = [1,3,348,2]
fooList.append(3)
fooList.append(2734)
print(fooList) # [1,3,348,2,3,2734]

Number of lines in a file in Java

Only way to know how many lines there are in file is to count them. You can of course create a metric from your data giving you an average length of one line and then get the file size and divide that with avg. length but that won't be accurate.

Connect to external server by using phpMyAdmin

To set up an external DB and still use your local DB, you need to edit the config.inc.php file:

On Ubuntu: sudo gedit /etc/phpmyadmin/config.inc.php

The file is roughly set up like this:

if (!empty($dbname)) {

    //Your local db setup

     $i++;
}

What you need to do is duplicate the "your local db setup" by copying and pasting it outside of the IF statement I've shown in the code below, and change the host to you external IP. Mine for example is:

$cfg['Servers'][$i]['host'] = '10.10.1.90:23306';

You can leave the defaults (unless you know you need to change them)

Save and refresh your PHPMYADMIN login page and a new dropdown should appear. You should be good to go.

EDIT: if you want to give the server a name to select at login page, rather than having just the IP address to select, add this to the server setup:

$cfg['Servers'][$i]['verbose'] = 'Name to show when selecting your server';

It's good if you have multiple server configs.

Hide Show content-list with only CSS, no javascript used

I wouldn't use checkboxes, i'd use the code you already have

DEMO http://jsfiddle.net/6W7XD/1/

CSS

body {
  display: block;
}
.span3:focus ~ .alert {
  display: none;
}
.span2:focus ~ .alert {
  display: block;
}
.alert{display:none;}

HTML

<span class="span3">Hide Me</span>
<span class="span2">Show Me</span>
<p class="alert" >Some alarming information here</p>

This way the text is only hidden on click of the hide element

How to pass an event object to a function in Javascript?

Although this is the accepted answer, toto_tico's answer below is better :)

Try making the onclick js use 'return' to ensure the desired return value gets used...

<button type="button" value="click me" onclick="return check_me();" />

What does the "+" (plus sign) CSS selector mean?

It selects the next paragraph and indents the beginning of the paragraph from the left just as you might in Microsoft Word.

MySQL skip first 10 results

LIMIT allow you to skip any number of rows. It has two parameters, and first of them - how many rows to skip

Replace non-numeric with empty string

You don't need to use Regex.

phone = new String(phone.Where(c => char.IsDigit(c)).ToArray())

Maven error :Perhaps you are running on a JRE rather than a JDK?

I had the same error and I was missing the User variable: JAVA_HOME and the value for the SDK - "C:\Program Files\Java\jdk-9.0.1" in my case

Count textarea characters

$("#textarea").keyup(function(){
  $("#count").text($(this).val().length);
});

The above will do what you want. If you want to do a count down then change it to this:

$("#textarea").keyup(function(){
  $("#count").text("Characters left: " + (500 - $(this).val().length));
});

Alternatively, you can accomplish the same thing without jQuery using the following code. (Thanks @Niet)

document.getElementById('textarea').onkeyup = function () {
  document.getElementById('count').innerHTML = "Characters left: " + (500 - this.value.length);
};

setting textColor in TextView in layout/main.xml main layout file not referencing colors.xml file. (It wants a #RRGGBB instead of @color/text_color)

A variation using just standard color code:

android:textColor="#ff0000"

How to create a new text file using Python

f = open("Path/To/Your/File.txt", "w")   # 'r' for reading and 'w' for writing
f.write("Hello World from " + f.name)    # Write inside file 
f.close()                                # Close file 

# Method 2shush
with open("Path/To/Your/File.txt", "w") as f:   # Opens file and casts as f 
    f.write("Hello World form " + f.name)       # Writing
# File closed automatically

Extract string between two strings in java

Your regex looks correct, but you're splitting with it instead of matching with it. You want something like this:

// Untested code
Matcher matcher = Pattern.compile("<%=(.*?)%>").matcher(str);
while (matcher.find()) {
    System.out.println(matcher.group());
}

How to delete history of last 10 commands in shell?

I use this (I have bash 4):

histrm() {
    local num=${1:- 1}
    builtin history -d $(builtin history | sed -rn '$s/^[^[:digit:]]+([[:digit:]]+)[^[:digit:]].*$/\1/p')
    (( num-- )) && $FUNCNAME $num
    builtin history -w
}

The builtin history parts as well as the last -w is because I have in place a variation of the famous tricks to share history across terminals and this function would break without those parts. They ensure a call to the real bash history builtin (and not to my own wrapper around it), and to write the history to HISTFILE right after the entries were removed.

However this will work as it is with "normal" history configurations.

You should call it with the number of last entries you want to remove, for example:

histrm 10

Will remove the last 10 entries.

Notice: Array to string conversion in

The problem is that $money is an array and you are treating it like a string or a variable which can be easily converted to string. You should say something like:

 '.... Money:'.$money['money']

@Resource vs @Autowired

In spring pre-3.0 it doesn't matter which one.

In spring 3.0 there's support for the standard (JSR-330) annotation @javax.inject.Inject - use it, with a combination of @Qualifier. Note that spring now also supports the @javax.inject.Qualifier meta-annotation:

@Qualifier
@Retention(RUNTIME)
public @interface YourQualifier {}

So you can have

<bean class="com.pkg.SomeBean">
   <qualifier type="YourQualifier"/>
</bean>

@YourQualifier
@Component
public class SomeBean implements Foo { .. }

And then:

@Inject @YourQualifier private Foo foo;

This makes less use of String-names, which can be misspelled and are harder to maintain.

As for the original question: both, without specifying any attributes of the annotation, perform injection by type. The difference is:

@Resource allows you to specify a name of the injected bean
@Autowired allows you to mark it as non-mandatory.

Count records for every month in a year

This will give you the count per month for 2012;

SELECT MONTH(ARR_DATE) MONTH, COUNT(*) COUNT
FROM table_emp
WHERE YEAR(arr_date)=2012
GROUP BY MONTH(ARR_DATE);

Demo here.

XPath test if node value is number

I've been dealing with 01 - which is a numeric.

string(number($v)) != string($v) makes the segregation

Catch Ctrl-C in C

Or you can put the terminal in raw mode, like this:

struct termios term;

term.c_iflag |= IGNBRK;
term.c_iflag &= ~(INLCR | ICRNL | IXON | IXOFF);
term.c_lflag &= ~(ICANON | ECHO | ECHOK | ECHOE | ECHONL | ISIG | IEXTEN);
term.c_cc[VMIN] = 1;
term.c_cc[VTIME] = 0;
tcsetattr(fileno(stdin), TCSANOW, &term);

Now it should be possible to read Ctrl+C keystrokes using fgetc(stdin). Beware using this though because you can't Ctrl+Z, Ctrl+Q, Ctrl+S, etc. like normally any more either.

Remove all special characters, punctuation and spaces from string

This will remove all non-alphanumeric characters except spaces.

string = "Special $#! characters   spaces 888323"
''.join(e for e in string if (e.isalnum() or e.isspace()))

Special characters spaces 888323

HTML5 Canvas 100% Width Height of Viewport?

I'll answer the more general question of how to have a canvas dynamically adapt in size upon window resize. The accepted answer appropriately handles the case where width and height are both supposed to be 100%, which is what was asked for, but which also will change the aspect ratio of the canvas. Many users will want the canvas to resize on window resize, but while keeping the aspect ratio untouched. It's not the exact question, but it "fits in", just putting the question into a slightly more general context.

The window will have some aspect ratio (width / height), and so will the canvas object. How you want these two aspect ratios to relate to each other is one thing you'll have to be clear about, there is no "one size fits all" answer to that question - I'll go through some common cases of what you might want.

Most important thing you have to be clear about: the html canvas object has a width attribute and a height attribute; and then, the css of the same object also has a width and a height attribute. Those two widths and heights are different, both are useful for different things.

Changing the width and height attributes is one method with which you can always change the size of your canvas, but then you'll have to repaint everything, which will take time and is not always necessary, because some amount of size change you can accomplish via the css attributes, in which case you do not redraw the canvas.

I see 4 cases of what you might want to happen on window resize (all starting with a full screen canvas)

1: you want the width to remain 100%, and you want the aspect ratio to stay as it was. In that case, you do not need to redraw the canvas; you don't even need a window resize handler. All you need is

$(ctx.canvas).css("width", "100%");

where ctx is your canvas context. fiddle: resizeByWidth

2: you want width and height to both stay 100%, and you want the resulting change in aspect ratio to have the effect of a stretched-out image. Now, you still don't need to redraw the canvas, but you need a window resize handler. In the handler, you do

$(ctx.canvas).css("height", window.innerHeight);

fiddle: messWithAspectratio

3: you want width and height to both stay 100%, but the answer to the change in aspect ratio is something different from stretching the image. Then you need to redraw, and do it the way that is outlined in the accepted answer.

fiddle: redraw

4: you want the width and height to be 100% on page load, but stay constant thereafter (no reaction to window resize.

fiddle: fixed

All fiddles have identical code, except for line 63 where the mode is set. You can also copy the fiddle code to run on your local machine, in which case you can select the mode via a querystring argument, as ?mode=redraw

TypeScript function overloading

When you overload in TypeScript, you only have one implementation with multiple signatures.

class Foo {
    myMethod(a: string);
    myMethod(a: number);
    myMethod(a: number, b: string);
    myMethod(a: any, b?: string) {
        alert(a.toString());
    }
}

Only the three overloads are recognized by TypeScript as possible signatures for a method call, not the actual implementation.

In your case, I would personally use two methods with different names as there isn't enough commonality in the parameters, which makes it likely the method body will need to have lots of "ifs" to decide what to do.

TypeScript 1.4

As of TypeScript 1.4, you can typically remove the need for an overload using a union type. The above example can be better expressed using:

myMethod(a: string | number, b?: string) {
    alert(a.toString());
}

The type of a is "either string or number".

Using PowerShell to write a file in UTF-8 without the BOM

One technique I utilize is to redirect output to an ASCII file using the Out-File cmdlet.

For example, I often run SQL scripts that create another SQL script to execute in Oracle. With simple redirection (">"), the output will be in UTF-16 which is not recognized by SQLPlus. To work around this:

sqlplus -s / as sysdba "@create_sql_script.sql" |
Out-File -FilePath new_script.sql -Encoding ASCII -Force

The generated script can then be executed via another SQLPlus session without any Unicode worries:

sqlplus / as sysdba "@new_script.sql" |
tee new_script.log

Unable to Install Any Package in Visual Studio 2015

Closing and re-opening VS2015 resolves the issue.

It seems that in some cases, simply reloading the affected project will work.

How do I split a multi-line string into multiple lines?

Like the others said:

inputString.split('\n')  # --> ['Line 1', 'Line 2', 'Line 3']

This is identical to the above, but the string module's functions are deprecated and should be avoided:

import string
string.split(inputString, '\n')  # --> ['Line 1', 'Line 2', 'Line 3']

Alternatively, if you want each line to include the break sequence (CR,LF,CRLF), use the splitlines method with a True argument:

inputString.splitlines(True)  # --> ['Line 1\n', 'Line 2\n', 'Line 3']

Run a mySQL query as a cron job?

I personally find it easier use MySQL event scheduler than cron.

Enable it with

SET GLOBAL event_scheduler = ON;

and create an event like this:

CREATE EVENT name_of_event
ON SCHEDULE EVERY 1 DAY
STARTS '2014-01-18 00:00:00'
DO
DELETE FROM tbl_message WHERE DATEDIFF( NOW( ) ,  timestamp ) >=7;

and that's it.

Read more about the syntax here and here is more general information about it.

Setting the JVM via the command line on Windows

You should be able to do this via the command line arguments, assuming these are Sun VMs installed using the usual Windows InstallShield mechanisms with the JVM finder EXE in system32.

Type java -help for the options. In particular, see:

-version:<value>
              require the specified version to run
-jre-restrict-search | -jre-no-restrict-search
              include/exclude user private JREs in the version search

how to set select element as readonly ('disabled' doesnt pass select value on server)

without disabling the selected value on submitting..

$('#selectID option:not(:selected)').prop('disabled', true);

If you use Jquery version lesser than 1.7
$('#selectID option:not(:selected)').attr('disabled', true);

It works for me..

Windows batch: sleep

timeout /t 10 /nobreak > NUL

/t specifies the time to wait in seconds

/nobreak won't interrupt the timeout if you press a key (except CTRL-C)

> NUL will suppress the output of the command

How to create a session using JavaScript?

You can use sessionStorage it is similar to localStorage but sessionStorage gets clear when the page session ends while localStorage has no expiration set.

See https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage

What are these ^M's that keep showing up in my files in emacs?

I ran into this issue a while back. The ^M represents a Carriage Return, and searching on Ctrl-Q Ctrl-M (This creates a literal ^M) will allow you get a handle on this character within Emacs. I did something along these lines:

M-x replace-string [ENTER] C-q C-m [ENTER] \n [ENTER]

Where is the visual studio HTML Designer?

Go to [Tools, Options], section "Web Forms Designer" and enable the option "Enable Web Forms Designer". That should give you the Design and Split option again.

Can two Java methods have same name with different return types?

Only if their parameter declarations are different from memory.

VBA Macro to compare all cells of two Excel files

Do NOT loop through all cells!! There is a lot of overhead in communications between worksheets and VBA, for both reading and writing. Looping through all cells will be agonizingly slow. I'm talking hours.

Instead, load an entire sheet at once into a Variant array. In Excel 2003, this takes about 2 seconds (and 250 MB of RAM). Then you can loop through it in no time at all.

In Excel 2007 and later, sheets are about 1000 times larger (1048576 rows × 16384 columns = 17 billion cells, compared to 65536 rows × 256 columns = 17 million in Excel 2003). You will run into an "Out of memory" error if you try to load the whole sheet into a Variant; on my machine I can only load 32 million cells at once. So you have to limit yourself to the range you know has actual data in it, or load the sheet bit by bit, e.g. 30 columns at a time.

Option Explicit

Sub test()

    Dim varSheetA As Variant
    Dim varSheetB As Variant
    Dim strRangeToCheck As String
    Dim iRow As Long
    Dim iCol As Long

    strRangeToCheck = "A1:IV65536"
    ' If you know the data will only be in a smaller range, reduce the size of the ranges above.
    Debug.Print Now
    varSheetA = Worksheets("Sheet1").Range(strRangeToCheck)
    varSheetB = Worksheets("Sheet2").Range(strRangeToCheck) ' or whatever your other sheet is.
    Debug.Print Now

    For iRow = LBound(varSheetA, 1) To UBound(varSheetA, 1)
        For iCol = LBound(varSheetA, 2) To UBound(varSheetA, 2)
            If varSheetA(iRow, iCol) = varSheetB(iRow, iCol) Then
                ' Cells are identical.
                ' Do nothing.
            Else
                ' Cells are different.
                ' Code goes here for whatever it is you want to do.
            End If
        Next iCol
    Next iRow

End Sub

To compare to a sheet in a different workbook, open that workbook and get the sheet as follows:

Set wbkA = Workbooks.Open(filename:="C:\MyBook.xls")
Set varSheetA = wbkA.Worksheets("Sheet1") ' or whatever sheet you need

Gradle error: could not execute build using gradle distribution

I had the same problem on Ubuntu with Eclipse 4.3 (Kepler) and the problem was that I created the project with a minus-sign in it.

I recreated the project with no specialchars and it all worked fine

How do I completely remove root password

Did you try passwd -d root? Most likely, this will do what you want.

You can also manually edit /etc/shadow: (Create a backup copy. Be sure that you can log even if you mess up, for example from a rescue system.) Search for "root". Typically, the root entry looks similar to

root:$X$SK5xfLB1ZW:0:0...

There, delete the second field (everything between the first and second colon):

root::0:0...

Some systems will make you put an asterisk (*) in the password field instead of blank, where a blank field would allow no password (CentOS 8 for example)

root:*:0:0...

Save the file, and try logging in as root. It should skip the password prompt. (Like passwd -d, this is a "no password" solution. If you are really looking for a "blank password", that is "ask for a password, but accept if the user just presses Enter", look at the manpage of mkpasswd, and use mkpasswd to create the second field for the /etc/shadow.)

Javascript, Time and Date: Getting the current minute, hour, day, week, month, year of a given millisecond time

Regarding number of days in month just use static switch command and check if (year % 4 == 0) in which case February will have 29 days.

Minute, hour, day etc:

var someMillisecondValue = 511111222127;
var date = new Date(someMillisecondValue);
var minute = date.getMinutes();
var hour = date.getHours();
var day = date.getDate();
var month = date.getMonth();
var year = date.getFullYear();
alert([minute, hour, day, month, year].join("\n"));

How to get the Power of some Integer in Swift language?

Or just :

var a:Int = 3
var b:Int = 3
println(pow(Double(a),Double(b)))

How to fix org.hibernate.LazyInitializationException - could not initialize proxy - no Session

In my case a misplaced session.clear() was causing this problem.

Grep and Python

You can use python-textops3 :

from textops import *

print('\n'.join(cat(f) | grep(search_term)))

with python-textops3 you can use unix-like commands with pipes

How can I center an image in Bootstrap?

Image by default is displayed as inline-block, you need to display it as block in order to center it with .mx-auto. This can be done with built-in .d-block:

<div class="container">
    <div class="row">
        <div class="col-4">
            <img class="mx-auto d-block" src="...">  
        </div>
    </div>
</div>

Or leave it as inline-block and wrapped it in a div with .text-center:

<div class="container">
    <div class="row">
        <div class="col-4">
          <div class="text-center">
            <img src="..."> 
          </div>     
        </div>
    </div>
</div>

I made a fiddle showing both ways. They are documented here as well.

HTTP 404 when accessing .svc file in IIS

I see you've already solved your problem - but for posterity:

We had a similar problem, and the SVC handler was already correctly installed. Our problem was the ExtensionlessUrl handler processing requests before they reached the SVC handler.

To check this - in Handler Mappings in IIS Manager at the web server level, view the list of handlers in order (it's an option on the right-hand side). If the various ExtensionlessUrl handlers appear above the SVC handlers, then repeatedly move them down until they're at the bottom.

How to add an image to an svg container using D3.js

In SVG (contrasted with HTML), you will want to use <image> instead of <img> for elements.

Try changing your last block with:

var imgs = svg.selectAll("image").data([0]);
            imgs.enter()
            .append("svg:image")
            ...

Named colors in matplotlib

I constantly forget the names of the colors I want to use and keep coming back to this question =)

The previous answers are great, but I find it a bit difficult to get an overview of the available colors from the posted image. I prefer the colors to be grouped with similar colors, so I slightly tweaked the matplotlib answer that was mentioned in a comment above to get a color list sorted in columns. The order is not identical to how I would sort by eye, but I think it gives a good overview.

I updated the image and code to reflect that 'rebeccapurple' has been added and the three sage colors have been moved under the 'xkcd:' prefix since I posted this answer originally.

I really didn't change much from the matplotlib example, but here is the code for completeness.

import matplotlib.pyplot as plt
from matplotlib import colors as mcolors


colors = dict(mcolors.BASE_COLORS, **mcolors.CSS4_COLORS)

# Sort colors by hue, saturation, value and name.
by_hsv = sorted((tuple(mcolors.rgb_to_hsv(mcolors.to_rgba(color)[:3])), name)
                for name, color in colors.items())
sorted_names = [name for hsv, name in by_hsv]

n = len(sorted_names)
ncols = 4
nrows = n // ncols

fig, ax = plt.subplots(figsize=(12, 10))

# Get height and width
X, Y = fig.get_dpi() * fig.get_size_inches()
h = Y / (nrows + 1)
w = X / ncols

for i, name in enumerate(sorted_names):
    row = i % nrows
    col = i // nrows
    y = Y - (row * h) - h

    xi_line = w * (col + 0.05)
    xf_line = w * (col + 0.25)
    xi_text = w * (col + 0.3)

    ax.text(xi_text, y, name, fontsize=(h * 0.8),
            horizontalalignment='left',
            verticalalignment='center')

    ax.hlines(y + h * 0.1, xi_line, xf_line,
              color=colors[name], linewidth=(h * 0.8))

ax.set_xlim(0, X)
ax.set_ylim(0, Y)
ax.set_axis_off()

fig.subplots_adjust(left=0, right=1,
                    top=1, bottom=0,
                    hspace=0, wspace=0)
plt.show()

Additional named colors

Updated 2017-10-25. I merged my previous updates into this section.

xkcd

If you would like to use additional named colors when plotting with matplotlib, you can use the xkcd crowdsourced color names, via the 'xkcd:' prefix:

plt.plot([1,2], lw=4, c='xkcd:baby poop green')

Now you have access to a plethora of named colors!

Tableau

The default Tableau colors are available in matplotlib via the 'tab:' prefix:

plt.plot([1,2], lw=4, c='tab:green')

There are ten distinct colors:

HTML

You can also plot colors by their HTML hex code:

plt.plot([1,2], lw=4, c='#8f9805')

This is more similar to specifying and RGB tuple rather than a named color (apart from the fact that the hex code is passed as a string), and I will not include an image of the 16 million colors you can choose from...

For more details, please refer to the matplotlib colors documentation and the source file specifying the available colors, _color_data.py.

difference between iframe, embed and object elements

iframe have "sandbox" attribute that may block pop up etc

How to use font-family lato?

Please put this code in head section

<link href='http://fonts.googleapis.com/css?family=Lato:400,700' rel='stylesheet' type='text/css'>

and use font-family: 'Lato', sans-serif; in your css. For example:

h1 {
    font-family: 'Lato', sans-serif;
    font-weight: 400;
}

Or you can use manually also

Generate .ttf font from fontSquiral

and can try this option

    @font-face {
        font-family: "Lato";
        src: url('698242188-Lato-Bla.eot');
        src: url('698242188-Lato-Bla.eot?#iefix') format('embedded-opentype'),
        url('698242188-Lato-Bla.svg#Lato Black') format('svg'),
        url('698242188-Lato-Bla.woff') format('woff'),
        url('698242188-Lato-Bla.ttf') format('truetype');
        font-weight: normal;
        font-style: normal;
}

Called like this

body {
  font-family: 'Lato', sans-serif;
}

Integer to IP Address - C

You actually can use an inet function. Observe.

main.c:

#include <arpa/inet.h>

main() {
    uint32_t ip = 2110443574;
    struct in_addr ip_addr;
    ip_addr.s_addr = ip;
    printf("The IP address is %s\n", inet_ntoa(ip_addr));
}

The results of gcc main.c -ansi; ./a.out is

The IP address is 54.208.202.125

Note that a commenter said this does not work on Windows.

datatable jquery - table header width not aligned with body width

I had a similar issue. I would create tables in expandable/collapsible panels. As long as the tables were visible, no problem. But if you collapsed a panel, resized the browser, and then expanded, the problem was there. I fixed it by placing the following in the click function for the panel header, whenever this function expanded the panel:

            // recalculate column widths, because they aren't recalculated when the table is hidden'
            $('.homeTable').DataTable()
                .columns.adjust()
                .responsive.recalc();

Can I set an unlimited length for maxJsonLength in web.config?

 JsonResult result = Json(r);
 result.MaxJsonLength = Int32.MaxValue;
 result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
 return result;

Custom style to jquery ui dialogs

The solution only solves part of the problem, it may let you style the container and contents but doesn't let you change the titlebar. I developed a workaround of sorts but adding an id to the dialog div, then using jQuery .prev to change the style of the div which is the previous sibling of the dialog's div. This works because when jQueryUI creates the dialog, your original div becomes a sibling of the new container, but the title div is a the immediately previous sibling to your original div but neither the container not the title div has an id to simplify selecting the div.

HTML

<button id="dialog1" class="btn btn-danger">Warning</button>
<div title="Nothing here, really" id="nonmodal1">
  Nothing here
</div>

You can use CSS to style the main section of the dialog but not the title

.custom-ui-widget-header-warning {
  background: #EBCCCC;
  font-size: 1em;
}

You need some JS to style the title

$(function() {
                   $("#nonmodal1").dialog({
                     minWidth: 400,
                     minHeight: 'auto',
                     autoOpen: false,
                     dialogClass: 'custom-ui-widget-header-warning',
                     position: {
                       my: 'center',
                       at: 'left'
                     }
                   });

                   $("#dialog1").click(function() {
                     if ($("#nonmodal1").dialog("isOpen") === true) {
                       $("#nonmodal1").dialog("close");
                     } else {
                       $("#nonmodal1").dialog("open").prev().css('background','#D9534F');

                     }
                   });
    });

The example only shows simple styling (background) but you can make it as complex as you wish.

You can see it in action here:

http://codepen.io/chris-hore/pen/OVMPay

Class 'DOMDocument' not found

If compiling from source with --disable-all then DOMDocument support can be enabled with
--enable-dom

Example:

./configure --disable-all --enable-dom

Tested and working for Centos7 and PHP7

find . -type f -exec chmod 644 {} ;

A good alternative is this:

find . -type f | xargs chmod -v 644

and for directories:

find . -type d | xargs chmod -v 755

and to be more explicit:

find . -type f | xargs -I{} chmod -v 644 {}

Android Volley - BasicNetwork.performRequest: Unexpected response code 400

What I did was append an extra '/' to my url, e.g.:

String url = "http://www.google.com"

String url = "http://www.google.com/"

SQL Case Expression Syntax?

Here are the CASE statement examples from the PostgreSQL docs (Postgres follows the SQL standard here):

SELECT a,
   CASE WHEN a=1 THEN 'one'
        WHEN a=2 THEN 'two'
        ELSE 'other'
   END
FROM test;

SELECT a,
   CASE a WHEN 1 THEN 'one'
          WHEN 2 THEN 'two'
          ELSE 'other'
   END
FROM test;

Obviously the second form is cleaner when you are just checking one field against a list of possible values. The first form allows more complicated expressions.

Reactive forms - disabled attribute

in Angular-9 if you want to disable/enable on button click here is a simple solution if you are using reactive forms.

define a function in component.ts file

//enable example you can use the same approach for disable with .disable()

toggleEnable() {
  this.yourFormName.controls.formFieldName.enable();
  console.log("Clicked")
}

Call it from your component.html

e.g

<button type="button" data-toggle="form-control" class="bg-primary text-white btn- 
                reset" style="width:100%"(click)="toggleEnable()">

An internal error occurred during: "Updating Maven Project". java.lang.NullPointerException

In our instance of this problem, we had pom.xml files where the m2e-specific life cycle mapping configuration

<pluginManagement>
    <plugins>
        <plugin>
            <groupId>org.eclipse.m2e</groupId>
            <artifactId>lifecycle-mapping</artifactId>
            <version>1.0.0</version>
            <configuration>
                <lifecycleMappingMetadata>
...

did not have the <version>1.0.0</version> part. When doing a Maven -> Update Project..., this causes the reported NullPointerException without a stack trace. When using a fresh Import... -> Existing Maven Projects, the same exception occurred, but with a stack trace that led me to find the above.

(This is with m2e 1.6.1.20150625-2338 in Eclipse Luna Service Release 2 (4.4.2).)

read pixel value in bmp file

Restore LogCat window within Android Studio

In my case, I see the window, but no messages in it. Only restart (studio version 1.5.1) brought the messages back.

Rebase array keys after unsetting elements

Or you can make your own function that passes the array by reference.

function array_unset($unsets, &$array) {
  foreach ($array as $key => $value) {
    foreach ($unsets as $unset) {
      if ($value == $unset) {
        unset($array[$key]);
        break;
      }
    }
  }
  $array = array_values($array);
}

So then all you have to do is...

$unsets = array(1,2);
array_unset($unsets, $array);

... and now your $array is without the values you placed in $unsets and the keys are reset

Get only the Date part of DateTime in mssql

The solution you want is the one proposed here:

https://stackoverflow.com/a/542802/50776

Basically, you do this:

cast(floor(cast(@dateVariable as float)) as datetime)

There is a function definition in the link which will allow you to consolidate the functionality and call it anywhere (instead of having to remember it) if you wish.

How to get error message when ifstream open fails

You could try letting the stream throw an exception on failure:

std::ifstream f;
//prepare f to throw if failbit gets set
std::ios_base::iostate exceptionMask = f.exceptions() | std::ios::failbit;
f.exceptions(exceptionMask);

try {
  f.open(fileName);
}
catch (std::ios_base::failure& e) {
  std::cerr << e.what() << '\n';
}

e.what(), however, does not seem to be very helpful:

I tried it on Win7, Embarcadero RAD Studio 2010 where it gives "ios_base::failbit set" whereas strerror(errno) gives "No such file or directory."
On Ubuntu 13.04, gcc 4.7.3 the exception says "basic_ios::clear" (thanks to arne)

If e.what() does not work for you (I don't know what it will tell you about the error, since that's not standardized), try using std::make_error_condition (C++11 only):

catch (std::ios_base::failure& e) {
  if ( e.code() == std::make_error_condition(std::io_errc::stream) )
    std::cerr << "Stream error!\n"; 
  else
    std::cerr << "Unknown failure opening file.\n";
}

Is it possible in Java to catch two exceptions in the same catch block?

Java 7 and later

Multiple-exception catches are supported, starting in Java 7.

The syntax is:

try {
     // stuff
} catch (Exception1 | Exception2 ex) {
     // Handle both exceptions
}

The static type of ex is the most specialized common supertype of the exceptions listed. There is a nice feature where if you rethrow ex in the catch, the compiler knows that only one of the listed exceptions can be thrown.

Java 6 and earlier

Prior to Java 7, there are ways to handle this problem, but they tend to be inelegant, and to have limitations.

Approach #1

try {
     // stuff
} catch (Exception1 ex) {
     handleException(ex);
} catch (Exception2 ex) {
     handleException(ex);
}

public void handleException(SuperException ex) {
     // handle exception here
}

This gets messy if the exception handler needs to access local variables declared before the try. And if the handler method needs to rethrow the exception (and it is checked) then you run into serious problems with the signature. Specifically, handleException has to be declared as throwing SuperException ... which potentially means you have to change the signature of the enclosing method, and so on.

Approach #2

try {
     // stuff
} catch (SuperException ex) {
     if (ex instanceof Exception1 || ex instanceof Exception2) {
         // handle exception
     } else {
         throw ex;
     }
}

Once again, we have a potential problem with signatures.

Approach #3

try {
     // stuff
} catch (SuperException ex) {
     if (ex instanceof Exception1 || ex instanceof Exception2) {
         // handle exception
     }
}

If you leave out the else part (e.g. because there are no other subtypes of SuperException at the moment) the code becomes more fragile. If the exception hierarchy is reorganized, this handler without an else may end up silently eating exceptions!

Auto start print html page using javascript

Use this script

 <script type="text/javascript">
      window.onload = function() { window.print(); }
 </script>

Principal Component Analysis (PCA) in Python

You can find a PCA function in the matplotlib module:

import numpy as np
from matplotlib.mlab import PCA

data = np.array(np.random.randint(10,size=(10,3)))
results = PCA(data)

results will store the various parameters of the PCA. It is from the mlab part of matplotlib, which is the compatibility layer with the MATLAB syntax

EDIT: on the blog nextgenetics I found a wonderful demonstration of how to perform and display a PCA with the matplotlib mlab module, have fun and check that blog!

Html5 Placeholders with .NET MVC 3 Razor EditorFor extension?

Here is a solution I made using the above ideas that can be used for TextBoxFor and PasswordFor:

public static class HtmlHelperEx
{
    public static MvcHtmlString TextBoxWithPlaceholderFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
    {
        var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
        return htmlHelper.TextBoxFor(expression, htmlAttributes.AddAttribute("placeholder", metadata.Watermark));

    }

    public static MvcHtmlString PasswordWithPlaceholderFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
    {
        var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
        return htmlHelper.PasswordFor(expression, htmlAttributes.AddAttribute("placeholder", metadata.Watermark));

    }
}

public static class HtmlAttributesHelper
{
    public static IDictionary<string, object> AddAttribute(this object htmlAttributes, string name, object value)
    {
        var dictionary = htmlAttributes == null ? new Dictionary<string, object>() : htmlAttributes.ToDictionary();
        if (!String.IsNullOrWhiteSpace(name) && value != null && !String.IsNullOrWhiteSpace(value.ToString()))
            dictionary.Add(name, value);
        return dictionary;
    }

    public static IDictionary<string, object> ToDictionary(this object obj)
    {
        return TypeDescriptor.GetProperties(obj)
            .Cast<PropertyDescriptor>()
            .ToDictionary(property => property.Name, property => property.GetValue(obj));
    }
}

How can I use console logging in Internet Explorer?

I've been always doing something like this:

var log = (function () {
  try {
    return console.log;
  }
  catch (e) {
    return function () {};
  }
}());

and from that point just always use log(...), don't be too fancy using console.[warn|error|and so on], just keep it simple. I usually prefer simple solution then fancy external libraries, it usually pays off.

simple way to avoid problems with IE (with non existing console.log)

Programs & Examples On #Pep8 assembly

Changing font size and direction of axes text in ggplot2

Checking if a variable is initialized

Insert data using Entity Framework model

Why do you need to put #!/bin/bash at the beginning of a script file?

How to reference static assets within vue javascript

Angular Directive refresh on parameter change

Determining the path that a yum package installed to

Finding an elements XPath using IE Developer tool

Import functions from another js file. Javascript

Pylint, PyChecker or PyFlakes?

How to add an integer to each element in a list?

When should I use cross apply over inner join?

Import an existing git project into GitLab?

Color text in terminal applications in UNIX

Different solution that I find more elegant

Simple example with multiple colors

CSS to prevent child element from inheriting parent styles

Open-Source Examples of well-designed Android Applications?

Can I set a breakpoint on 'memory access' in GDB?

In MVC, how do I return a string result?

jQuery Combobox/select autocomplete?

Picasso v/s Imageloader v/s Fresco vs Glide

How to trigger a phone call when clicking a link in a web page on mobile phone

How to check if a variable is NULL, then set it with a MySQL stored procedure?

Python urllib2: Receive JSON response from url

How to design RESTful search/filtering?

Adding and removing style attribute from div with jquery

offsetTop vs. jQuery.offset().top

Draw text in OpenGL ES

How can I set / change DNS using the command-prompt at windows 8

Exit from app when click button in android phonegap?

Finding the index of an item in a list

jQuery UI: Datepicker set year range dropdown to 100 years

CSS grid wrapping

How to use LINQ Distinct() with multiple fields

How to use java.net.URLConnection to fire and handle HTTP requests?

Update

How can apply multiple background color to one div

How to add manifest permission to an application?

Difference between \w and \b regular expression meta characters

Determine the data types of a data frame's columns

How to export a MySQL database to JSON?

How can I put a ListView into a ScrollView without it collapsing?

How do I get first name and last name as whole name in a MYSQL query?

Set port for php artisan.php serve

Error: EACCES: permission denied, access '/usr/local/lib/node_modules'

How to create a data file for gnuplot?

Add a common Legend for combined ggplots

Get startup type of Windows service using PowerShell

change pgsql port

Export to xls using angularjs

Passing properties by reference in C#

How can I make an "are you sure" prompt in a Windows batchfile?

Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sierra/Mojave?

CodeIgniter: How to use WHERE clause and OR clause

Using comma as list separator with AngularJS

How do I set up access control in SVN?

How can I stop the browser back button using JavaScript?

Count the number of occurrences of a character in a string in Javascript

How can I check if the array of objects have duplicate property values?

Prefer composition over inheritance?

Using Case/Switch and GetType to determine the object

Logger slf4j advantages of formatting with {} instead of string concatenation

C - Convert an uppercase letter to lowercase

Select query to get data from SQL Server

Excel 2010 VBA - Close file No Save without prompt

HttpURLConnection timeout settings

How to browse localhost on Android device?

Change remote repository credentials (authentication) on Intellij IDEA 14

How to validate a credit card number

How to convert buffered image to image and vice-versa?

const to Non-const Conversion in C++

SMTP error 554

android pick images from gallery

Mockito. Verify method arguments

The type 'string' must be a non-nullable type in order to use it as parameter T in the generic type or method 'System.Nullable<T>'

How to execute IN() SQL queries with Spring's JDBCTemplate effectively?

I want to truncate a text or line with ellipsis using JavaScript

UPDATE with CASE and IN - Oracle