Programs & Examples On #Openoffice base

OpenOffice Base is the database management application of the OpenOffice project.

ThreeJS: Remove object from scene

I had The same problem like you have. I try this code and it works just fine: When you create your object put this object.is_ob = true

function loadOBJFile(objFile){            
    /* material of OBJ model */                                          
    var OBJMaterial = new THREE.MeshPhongMaterial({color: 0x8888ff});
    var loader = new THREE.OBJLoader();
    loader.load(objFile, function (object){
        object.traverse (function (child){
            if (child instanceof THREE.Mesh) {
                child.material = OBJMaterial;
            }
        });
        object.position.y = 0.1;
      // add this code
        object.is_ob = true;

        scene.add(object);
    });     
}

function addEntity(object) {
    loadOBJFile(object.name);
}

And then then you delete your object try this code:

function removeEntity(object){
    var obj, i;
            for ( i = scene.children.length - 1; i >= 0 ; i -- ) {
                obj = scene.children[ i ];
                if ( obj.is_ob) {
                    scene.remove(obj);

                }
            }
}

Try that and tell me if that works, it seems that three js doesn't recognize the object after added to the scene. But with this trick it works.

How can I initialise a static Map?

Here's my favorite if I

  • don't want to (or cannot) use Guava's ImmutableMap.of()
  • or I need a mutable Map
  • or I need more than the 10 entry limit in Map.of() from JDK9+
public static <A> Map<String, A> asMap(Object... keysAndValues) {
  return new LinkedHashMap<String, A>() {{
    for (int i = 0; i < keysAndValues.length - 1; i++) {
      put(keysAndValues[i].toString(), (A) keysAndValues[++i]);
    }
  }};
}

It's very compact, and it ignores stray values (i.e. a final key without a value).

Usage:

Map<String, String> one = asMap("1stKey", "1stVal", "2ndKey", "2ndVal");
Map<String, Object> two = asMap("1stKey", Boolean.TRUE, "2ndKey", new Integer(2));

How to open the command prompt and insert commands using Java?

String[] command = {"cmd.exe" , "/c", "start" , "cmd.exe" , "/k" , "\" dir && ipconfig 
\"" };
ProcessBuilder probuilder = new ProcessBuilder( command );
probuilder.directory(new File("D:\\Folder1"));
Process process = probuilder.start();

Copy and paste content from one file to another file in vi

These are all great suggestions, but if you know location of text in another file use sed with ease. :r! sed -n '1,10 p' < input_file.txt This will insert 10 lines in an already open file at the current position of the cursor.

How to convert a String to CharSequence?

Straight answer:

String s = "Hello World!";

// String => CharSequence conversion:

CharSequence cs = s;  // String is already a CharSequence

CharSequence is an interface, and the String class implements CharSequence.

What is Bit Masking?

Masking means to keep/change/remove a desired part of information. Lets see an image-masking operation; like- this masking operation is removing any thing that is not skin-

enter image description here

We are doing AND operation in this example. There are also other masking operators- OR, XOR.


Bit-Masking means imposing mask over bits. Here is a bit-masking with AND-

     1 1 1 0 1 1 0 1   [input]
(&)  0 0 1 1 1 1 0 0    [mask]
------------------------------
     0 0 1 0 1 1 0 0  [output]

So, only the middle 4 bits (as these bits are 1 in this mask) remain.

Lets see this with XOR-

     1 1 1 0 1 1 0 1   [input]
(^)  0 0 1 1 1 1 0 0    [mask]
------------------------------
     1 1 0 1 0 0 0 1  [output]

Now, the middle 4 bits are flipped (1 became 0, 0 became 1).


So, using bit-mask we can access individual bits [examples]. Sometimes, this technique may also be used for improving performance. Take this for example-

bool isOdd(int i) {
    return i%2;
}

This function tells if an integer is odd/even. We can achieve the same result with more efficiency using bit-mask-

bool isOdd(int i) {
    return i&1;
}

Short Explanation: If the least significant bit of a binary number is 1 then it is odd; for 0 it will be even. So, by doing AND with 1 we are removing all other bits except for the least significant bit i.e.:

     55  ->  0 0 1 1 0 1 1 1   [input]
(&)   1  ->  0 0 0 0 0 0 0 1    [mask]
---------------------------------------
      1  <-  0 0 0 0 0 0 0 1  [output]

Replace new lines with a comma delimiter with Notepad++?

USE Chrome's Search Bar

1-press CTRL F
2-paste the copied text in search bar
3-press CTRL A followed by CTRL C to copy the text again from search
4-paste in Notepad++
5-replace 'space' with ','

1-click for image
2-click for image

How to disable Django's CSRF validation?

If you want disable it in Global, you can write a custom middleware, like this

from django.utils.deprecation import MiddlewareMixin

class DisableCsrfCheck(MiddlewareMixin):

    def process_request(self, req):
        attr = '_dont_enforce_csrf_checks'
        if not getattr(req, attr, False):
            setattr(req, attr, True)

then add this class youappname.middlewarefilename.DisableCsrfCheck to MIDDLEWARE_CLASSES lists, before django.middleware.csrf.CsrfViewMiddleware

Is it possible to install another version of Python to Virtualenv?

No, but you can install an isolated Python build (such as ActivePython) under your $HOME directory.

This approach is the fastest, and doesn't require you to compile Python yourself.

(as a bonus, you also get to use ActiveState's binary package manager)

Pagination on a list using ng-repeat

If you have not too much data, you can definitely do pagination by just storing all the data in the browser and filtering what's visible at a certain time.

Here's a simple pagination example: http://jsfiddle.net/2ZzZB/56/

That example was on the list of fiddles on the angular.js github wiki, which should be helpful: https://github.com/angular/angular.js/wiki/JsFiddle-Examples

EDIT: http://jsfiddle.net/2ZzZB/16/ to http://jsfiddle.net/2ZzZB/56/ (won't show "1/4.5" if there is 45 results)

Splitting string into multiple rows in Oracle

REGEXP_COUNT wasn't added until Oracle 11i. Here's an Oracle 10g solution, adopted from Art's solution.

SELECT trim(regexp_substr('Err1, Err2, Err3', '[^,]+', 1, LEVEL)) str_2_tab
  FROM dual
CONNECT BY LEVEL <=
  LENGTH('Err1, Err2, Err3')
    - LENGTH(REPLACE('Err1, Err2, Err3', ',', ''))
    + 1;

What's the fastest way to convert String to Number in JavaScript?

There are 4 ways to do it as far as I know.

Number(x);
parseInt(x, 10);
parseFloat(x);
+x;

By this quick test I made, it actually depends on browsers.

http://jsperf.com/best-of-string-to-number-conversion/2

Implicit marked the fastest on 3 browsers, but it makes the code hard to read… So choose whatever you feel like it!

Directory index forbidden by Options directive

Another issue that you might run into if you're running RHEL (I ran into it) is that there is a default welcome page configured with the httpd package that will override your settings, even if you put Options Indexes. The file is in /etc/httpd/conf.d/welcome.conf. See the following link for more info: http://wpapi.com/solved-issue-directory-index-forbidden-by-options-directive/

SQL set values of one column equal to values of another column in the same table

Here is sample code that might help you coping Column A to Column B:

UPDATE YourTable
SET ColumnB = ColumnA
WHERE
ColumnB IS NULL
AND ColumnA IS NOT NULL;

Making authenticated POST requests with Spring RestTemplate for Android

Very useful I had a slightly different scenario where I the request xml was itself the body of the POST and not a param. For that the following code can be used - Posting as an answer just in case anyone else having similar issue will benefit.

    final HttpHeaders headers = new HttpHeaders();
    headers.add("header1", "9998");
    headers.add("username", "xxxxx");
    headers.add("password", "xxxxx");
    headers.add("header2", "yyyyyy");
    headers.add("header3", "zzzzz");
    headers.setContentType(MediaType.APPLICATION_XML);
    headers.setAccept(Arrays.asList(MediaType.APPLICATION_XML));
    final HttpEntity<MyXmlbeansRequestDocument> httpEntity = new HttpEntity<MyXmlbeansRequestDocument>(
            MyXmlbeansRequestDocument.Factory.parse(request), headers);
    final ResponseEntity<MyXmlbeansResponseDocument> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity,MyXmlbeansResponseDocument.class);
    log.info(responseEntity.getBody());

Read only the first line of a file?

This should do it:

f = open('myfile.txt')
first = f.readline()

How can I create tests in Android Studio?

The easiest way I found is the streamlined in my following blog post:

  1. Create a folder in which you'll write all your unit tests (preferably com.example.app.tests)
  2. Create a new test class (preferably NameOfClassTestedTests, i.e BankAccountLoginActivityTests)
  3. Extend InstrumentationTestCase
  4. Write a failing unit test to make sure we succeeded configuring unit tests
  5. Note that a unit test method name must start with the word “test” (preferably testTestedMethodNameExpectedResult() i.e testBankAccountValidationFailedShouldLogout())
  6. Configure your project for unit tests:
  7. Open the 'Run...' menu and click 'edit configurations'
  8. Click the + button
  9. Select the Android Tests template
  10. Input a name for your run configuration (preferably 'AppName Tests')
  11. Select your app in the module combobox
  12. Select the “All In Package” radio button (generally you'd want to select this option because it runs all unit tests in all your test classes)
  13. Fill in the test package name from step 1 (i.e com.example.app.tests)
  14. Select the device you wish to run your tests on
  15. Apply and save the configuration
  16. Run unit tests (and expect failure):
  17. Select your newly created Tests configuration from the Run menu
  18. Click Run and read the results in the output console

Good luck making your code more readable, maintainable and well-tested!

Mean filter for smoothing images in Matlab

I see good answers have already been given, but I thought it might be nice to just give a way to perform mean filtering in MATLAB using no special functions or toolboxes. This is also very good for understanding exactly how the process works as you are required to explicitly set the convolution kernel. The mean filter kernel is fortunately very easy:

I = imread(...)
kernel = ones(3, 3) / 9; % 3x3 mean kernel
J = conv2(I, kernel, 'same'); % Convolve keeping size of I

Note that for colour images you would have to apply this to each of the channels in the image.

Difference between an API and SDK

API is specifications on how to do something, an interface, such as "The railroad tracks are four feet apart, and the metal bar is 1 inch wide" Now that you have the API you can now build a train that will fit on those railroad tracks if you want to go anywhere. API is just information on how to build your code, it doesn't do anything.

SDK is some package of actual tools that already worried about the specifications. "Here's a train, some coal, and a maintenance man. Use it to go from place to place" With the SDK you don't worry about specifics. An SDK is actual code, it can be used by itself to do something, but of course, the train won't start up spontaneously, you still have to get a conductor to control the train.

SDKs also have their own APIs. "If you want to power the train put coal in it", "Pull the blue lever to move the train.", "If the train starts acting funny, call the maintenance man" etc.

Why am I getting a NoClassDefFoundError in Java?

Everyone talks here about some Java configuration stuff, JVM problems etc., in my case the error was not related to these topics at all and had a very trivial and easy to solve reason: I had a wrong annotation at my endpoint in my Controller (Spring Boot application).

How to copy a selection to the OS X clipboard

What worked for me in my .vimrc

set clipboard=unnamed
if has("unnamedplus") " X11 support
    set clipboard+=unnamedplus
endif

Apache and Node.js on the Same Server

You can use a different approach such as writing a reverse proxy server with nodejs to proxy both apache and all other nodejs apps.

First you need to make apache run on a different port other than port 80. ex: port 8080

Then you can write a reverse proxy script with nodejs as:

var proxy = require('redbird')({port: 80, xfwd: false);

proxy.register("mydomain.me/blog", "http://mydomain.me:8080/blog");
proxy.register("mydomain.me", "http://mydomain.me:3000");

Following article describes the whole process of making this.

RUN APACHE WITH NODE JS REVERSE PROXY – USING REDBIRD

How to subtract 2 hours from user's local time?

According to Javascript Date Documentation, you can easily do this way:

var twoHoursBefore = new Date();
twoHoursBefore.setHours(twoHoursBefore.getHours() - 2);

And don't worry about if hours you set will be out of 0..23 range. Date() object will update the date accordingly.

Run local python script on remote server

ssh user@machine python < script.py - arg1 arg2

Because cat | is usually not necessary

Maven- No plugin found for prefix 'spring-boot' in the current project and in the plugin groups

If you don't want to use

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>(...)</version>
</parent>

as a parent POM, you may use the

mvn org.springframework.boot:spring-boot-maven-plugin:run

command instead.

Convert Java string to Time, NOT Date

java.sql.Time timeValue = new java.sql.Time(formatter.parse(fajr_prayertime).getTime());

cat, grep and cut - translated to python

you need to use os.system module to execute shell command

import os
os.system('command')

if you want to save the output for later use, you need to use subprocess module

import subprocess
child = subprocess.Popen('command',stdout=subprocess.PIPE,shell=True)
output = child.communicate()[0]

How to change xampp localhost to another folder ( outside xampp folder)?

just in case someone looks for this, the path to the file on Sourav answer (httpd.conf) in linux is /opt/lampp/etc/httpd.conf

How to get row number from selected rows in Oracle

you can just do

select rownum, l.* from student  l where name like %ram%

this assigns the row number as the rows are fetched (so no guaranteed ordering of course).

if you wanted to order first do:

select rownum, l.*
  from (select * from student l where name like %ram% order by...) l;

PostgreSQL column 'foo' does not exist

I fixed similar issues by qutating column name

SELECT * from table_name where "foo" is NULL;

In my case it was just

SELECT id, "foo" from table_name;

without quotes i'v got same error.

How can I check if a View exists in a Database?

You can check the availability of the view in various ways

FOR SQL SERVER

use sys.objects

IF EXISTS(
   SELECT 1
   FROM   sys.objects
   WHERE  OBJECT_ID = OBJECT_ID('[schemaName].[ViewName]')
          AND Type_Desc = 'VIEW'
)
BEGIN
    PRINT 'View Exists'
END

use sysobjects

IF NOT EXISTS (
   SELECT 1
   FROM   sysobjects
   WHERE  NAME = '[schemaName].[ViewName]'
          AND xtype = 'V'
)
BEGIN
    PRINT 'View Exists'
END

use sys.views

IF EXISTS (
   SELECT 1
   FROM sys.views
   WHERE OBJECT_ID = OBJECT_ID(N'[schemaName].[ViewName]')
)
BEGIN
    PRINT 'View Exists'
END

use INFORMATION_SCHEMA.VIEWS

IF EXISTS (
   SELECT 1
   FROM   INFORMATION_SCHEMA.VIEWS
   WHERE  table_name = 'ViewName'
          AND table_schema = 'schemaName'
)
BEGIN
    PRINT 'View Exists'
END

use OBJECT_ID

IF EXISTS(
   SELECT OBJECT_ID('ViewName', 'V')
)
BEGIN
    PRINT 'View Exists'
END

use sys.sql_modules

IF EXISTS (
   SELECT 1
   FROM   sys.sql_modules
   WHERE  OBJECT_ID = OBJECT_ID('[schemaName].[ViewName]')
)
BEGIN
   PRINT 'View Exists'
END

How to use group by with union in t-sql

Identifying the column is easy:

SELECT  *
FROM    ( SELECT    id,
                    time
          FROM      dbo.a
          UNION
          SELECT    id,
                    time
          FROM      dbo.b
        )
GROUP BY id

But it doesn't solve the main problem of this query: what's to be done with the second column values upon grouping by the first? Since (peculiarly!) you're using UNION rather than UNION ALL, you won't have entirely duplicated rows between the two subtables in the union, but you may still very well have several values of time for one value of the id, and you give no hint of what you want to do - min, max, avg, sum, or what?! The SQL engine should give an error because of that (though some such as mysql just pick a random-ish value out of the several, I believe sql-server is better than that).

So, for example, change the first line to SELECT id, MAX(time) or the like!

#1045 - Access denied for user 'root'@'localhost' (using password: YES)

if multiple myslq running on same port no enter image description here

Right click on wamp and test port 3306 if its wampmysqld64 its correct else change port no and restart server

Nullable type as a generic parameter possible?

Multiple generic constraints can't be combined in an OR fashion (less restrictive), only in an AND fashion (more restrictive). Meaning that one method can't handle both scenarios. The generic constraints also cannot be used to make a unique signature for the method, so you'd have to use 2 separate method names.

However, you can use the generic constraints to make sure that the methods are used correctly.

In my case, I specifically wanted null to be returned, and never the default value of any possible value types. GetValueOrDefault = bad. GetValueOrNull = good.

I used the words "Null" and "Nullable" to distinguish between reference types and value types. And here is an example of a couple extension methods I wrote that compliments the FirstOrDefault method in System.Linq.Enumerable class.

    public static TSource FirstOrNull<TSource>(this IEnumerable<TSource> source)
        where TSource: class
    {
        if (source == null) return null;
        var result = source.FirstOrDefault();   // Default for a class is null
        return result;
    }

    public static TSource? FirstOrNullable<TSource>(this IEnumerable<TSource?> source)
        where TSource : struct
    {
        if (source == null) return null;
        var result = source.FirstOrDefault();   // Default for a nullable is null
        return result;
    }

What are XAND and XOR

XOR (not neither and not both) B'0110' is the inverse (dual) of IFF (if and only if) B'1001'.

How to get the Mongo database specified in connection string in C#

Update:

MongoServer.Create is obsolete now (thanks to @aknuds1). Instead this use following code:

var _server = new MongoClient(connectionString).GetServer();

It's easy. You should first take database name from connection string and then get database by name. Complete example:

var connectionString = "mongodb://localhost:27020/mydb";

//take database name from connection string
var _databaseName = MongoUrl.Create(connectionString).DatabaseName;
var _server = MongoServer.Create(connectionString);

//and then get database by database name:
_server.GetDatabase(_databaseName);

Important: If your database and auth database are different, you can add a authSource= query parameter to specify a different auth database. (thank you to @chrisdrobison)

From docs:

NOTE If you are using the database segment as the initial database to use, but the username and password specified are defined in a different database, you can use the authSource option to specify the database in which the credential is defined. For example, mongodb://user:pass@hostname/db1?authSource=userDb would authenticate the credential against the userDb database instead of db1.

Starting the week on Monday with isoWeekday()

For those who want isoWeek to be the default you can modify moment's behaviour as such:

const moment = require('moment');
const proto = Object.getPrototypeOf(moment());

const {startOf, endOf} = proto;
proto.startOf = function(period) {
  if (period === 'week') {
    period = 'isoWeek';
  }
  return startOf.call(this, period);
};
proto.endOf = function(period) {
  if (period === 'week') {
    period = 'isoWeek';
  }
  return endOf.call(this, period);
};

Now you can simply use someDate.startOf('week') without worrying you'll get sunday or having to think about whether to use isoweek or isoWeek etc.

Plus you can store this in a variable like const period = 'week' and use it safely in subtract() or add() operations, e.g. moment().subtract(1, period).startOf(period);. This won't work with period being isoWeek.

Add inline style using Javascript

nFilter.style.width = '330px';
nFilter.style.float = 'left';

This should add an inline style to the element.

Move an array element from one array position to another

If the object is nested:

  let array = ['a', 'b', 'c', 'd', 'e'];
  let existingElement = JSON.parse(JSON.stringify(array[3]));
  array.splice(1, 0, existingElement);
  array.splice(4, 1);
  console.log(array)

How do I see all foreign keys to a table or column?

If you also want to get the name of the foreign key column:

SELECT i.TABLE_SCHEMA, i.TABLE_NAME, 
       i.CONSTRAINT_TYPE, i.CONSTRAINT_NAME, 
       k.COLUMN_NAME, k.REFERENCED_TABLE_NAME, k.REFERENCED_COLUMN_NAME 
  FROM information_schema.TABLE_CONSTRAINTS i 
  LEFT JOIN information_schema.KEY_COLUMN_USAGE k 
       ON i.CONSTRAINT_NAME = k.CONSTRAINT_NAME 
 WHERE i.TABLE_SCHEMA = '<TABLE_NAME>' AND i.CONSTRAINT_TYPE = 'FOREIGN KEY' 
 ORDER BY i.TABLE_NAME;

How to give a pandas/matplotlib bar graph custom colors

You can specify the color option as a list directly to the plot function.

from matplotlib import pyplot as plt
from itertools import cycle, islice
import pandas, numpy as np  # I find np.random.randint to be better

# Make the data
x = [{i:np.random.randint(1,5)} for i in range(10)]
df = pandas.DataFrame(x)

# Make a list by cycling through the colors you care about
# to match the length of your data.
my_colors = list(islice(cycle(['b', 'r', 'g', 'y', 'k']), None, len(df)))

# Specify this list of colors as the `color` option to `plot`.
df.plot(kind='bar', stacked=True, color=my_colors)

To define your own custom list, you can do a few of the following, or just look up the Matplotlib techniques for defining a color item by its RGB values, etc. You can get as complicated as you want with this.

my_colors = ['g', 'b']*5 # <-- this concatenates the list to itself 5 times.
my_colors = [(0.5,0.4,0.5), (0.75, 0.75, 0.25)]*5 # <-- make two custom RGBs and repeat/alternate them over all the bar elements.
my_colors = [(x/10.0, x/20.0, 0.75) for x in range(len(df))] # <-- Quick gradient example along the Red/Green dimensions.

The last example yields the follow simple gradient of colors for me:

enter image description here

I didn't play with it long enough to figure out how to force the legend to pick up the defined colors, but I'm sure you can do it.

In general, though, a big piece of advice is to just use the functions from Matplotlib directly. Calling them from Pandas is OK, but I find you get better options and performance calling them straight from Matplotlib.

Python time measure function

Elaborating on @Jonathan Ray I think this does the trick a bit better

import time
import inspect

def timed(f:callable):
    start = time.time()
    ret = f()
    elapsed = 1000*(time.time() - start)
    source_code=inspect.getsource(f).strip('\n') 
    logger.info(source_code+":  "+str(elapsed)+" seconds")
    return ret

It allows to take a regular line of code, say a = np.sin(np.pi) and transform it rather simply into

a = timed(lambda: np.sin(np.pi))

so that the timing is printed onto the logger and you can keep the same assignment of the result to a variable you might need for further work.

I suppose in Python 3.8 one could use the := but I do not have 3.8 yet

Loop through Map in Groovy?

Alternatively you could use a for loop as shown in the Groovy Docs:

def map = ['a':1, 'b':2, 'c':3]
for ( e in map ) {
    print "key = ${e.key}, value = ${e.value}"
}

/*
Result:
key = a, value = 1
key = b, value = 2
key = c, value = 3
*/

One benefit of using a for loop as opposed to an each closure is easier debugging, as you cannot hit a break point inside an each closure (when using Netbeans).

Using Default Arguments in a Function

<?php
function info($name="George",$age=18) {
echo "$name is $age years old.<br>";
}
info();     // prints default values(number of values = 2)
info("Nick");   // changes first default argument from George to Nick
info("Mark",17);    // changes both default arguments' values

?>

How to call a method daily, at specific time, in C#?

Solution with System.Threading.Timer:

    private void nameOfMethod()
    {
        //do something
    }

    /// <summary>
    /// run method at 22:00 every day
    /// </summary>
    private void runMethodEveryDay()
    {
        var runAt = DateTime.Today + TimeSpan.FromHours(22);

        if(runAt.Hour>=22)
            runAt = runAt.AddDays(1.00d); //if aplication is started after 22:00 

        var dueTime = runAt - DateTime.Now; //time before first run ; 

        long broj3 = (long)dueTime.TotalMilliseconds;
        TimeSpan ts2 = new TimeSpan(24, 0, 1);//period of repeating method
        long broj4 = (long)ts2.TotalMilliseconds;
        timer2 = new System.Threading.Timer(_ => nameOfMethod(), null, broj3, broj4);
    }

Get installed applications in a system

You can take a look at this article. It makes use of registry to read the list of installed applications.

public void GetInstalledApps()
{
    string uninstallKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
    using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(uninstallKey))
    {
        foreach (string skName in rk.GetSubKeyNames())
        {
            using (RegistryKey sk = rk.OpenSubKey(skName))
            {
                try
                {
                    lstInstalled.Items.Add(sk.GetValue("DisplayName"));
                }
                catch (Exception ex)
                { }
            }
        }
    }
}

How to read the post request parameters using JavaScript

You can read the post request parameter with jQuery-PostCapture(@ssut/jQuery-PostCapture).

PostCapture plugin is consisted of some tricks.

When you are click the submit button, the onsubmit event will be dispatched.

At the time, PostCapture will be serialize form data and save to html5 localStorage(if available) or cookie storage.

sorting dictionary python 3

I'm not sure whether this could help, but I had a similar problem and I managed to solve it, by defining an apposite function:

def sor_dic_key(diction):
    lista = []
    diction2 = {}
    for x in diction:
        lista.append([x, diction[x]])
    lista.sort(key=lambda x: x[0])
    for l in lista:
        diction2[l[0]] = l[1]
    return diction2

This function returns another dictionary with the same keys and relative values, but sorted by its keys. Similarly, I defined a function that could sort a dictionary by its values. I just needed to use x[1] instead of x[0] in the lambda function. I find this second function mostly useless, but one never can tell!

AngularJS ng-if with multiple conditions

Sure you can. Something like:

HTML

<div ng-controller="fessCntrl">    
     <label ng-repeat="(key,val) in list">
       <input type="radio" name="localityTypeRadio" ng-model="$parent.localityTypeRadio" ng-value="key" />{{key}}
         <div ng-if="key == 'City' || key == 'County'">
             <pre>City or County !!! {{$parent.localityTypeRadio}}</pre>
         </div>
         <div ng-if="key == 'Town'">
             <pre>Town!!! {{$parent.localityTypeRadio}}</pre>
         </div>        
      </label>
</div>

JS

var fessmodule = angular.module('myModule', []);

fessmodule.controller('fessCntrl', function ($scope) {

    $scope.list = {
        City: [{name: "cityA"}, {name: "cityB"}],
        County: [{ name: "countyA"}, {name: "countyB"}],
        Town: [{ name: "townA"}, {name: "townB"}]
      };

    $scope.localityTypeRadio = 'City';
});

fessmodule.$inject = ['$scope'];

Demo Fiddle

C compiler for Windows?

GCC works fine. Note that MSVC is not necessarily a valid solution because it does not support C99.

compareTo with primitives -> Integer / int

If you are using java 8, you can create Comparator by this method:

Comparator.comparingInt(i -> i);

if you would like to compare with reversed order:

Comparator.comparingInt(i -> -i);

Bulk Insertion in Laravel using eloquent ORM

To whoever is reading this, check out createMany() method.

/**
 * Create a Collection of new instances of the related model.
 *
 * @param  array  $records
 * @return \Illuminate\Database\Eloquent\Collection
 */
public function createMany(array $records)
{
    $instances = $this->related->newCollection();

    foreach ($records as $record) {
        $instances->push($this->create($record));
    }

    return $instances;
}

How to only find files in a given directory, and ignore subdirectories using bash

If you just want to limit the find to the first level you can do:

 find /dev -maxdepth 1 -name 'abc-*'

... or if you particularly want to exclude the .udev directory, you can do:

 find /dev -name '.udev' -prune -o -name 'abc-*' -print

Ant if else condition?

The quirky syntax using conditions on the target (described by Mads) is the only supported way to perform conditional execution in core ANT.

ANT is not a programming language and when things get complicated I choose to embed a script within my build as follows:

<target name="prepare-copy" description="copy file based on condition">
    <groovy>
        if (properties["some.condition"] == "true") {
            ant.copy(file:"${properties["some.dir"]}/true", todir:".")
        }
    </groovy>
</target>

ANT supports several languages (See script task), my preference is Groovy because of it's terse syntax and because it plays so well with the build.

Apologies, David I am not a fan of ant-contrib.

Format a JavaScript string using placeholders and an object of substitutions?

This allows you to do exactly that

NPM: https://www.npmjs.com/package/stringinject

GitHub: https://github.com/tjcafferkey/stringinject

By doing the following:

var str = stringInject("My username is {username} on {platform}", { username: "tjcafferkey", platform: "GitHub" });

// My username is tjcafferkey on Git

How to save to local storage using Flutter?

There are a few options:

Moor: Persistence library for Dart

Read and Write file

Shared preferences plugin for flutter

SQlite for flutter

How to print Boolean flag in NSLog?

NSArray *array1 = [NSArray arrayWithObjects:@"todd1", @"todd2", @"todd3", nil];
bool objectMembership = [array1 containsObject:@"todd1"];
NSLog(@"%d",objectMembership);  // prints 1 or 0

Could not open input file: composer.phar

I am using Windows 7, and I got the same problem as yours while using Composer via cmd.

The problem is solved when I use

php C:\ProgramData\ComposerSetup\bin\composer.phar create-project slim/slim-skeleton

instead of

php composer.phar create-project slim/slim-skeleton

Hope this is useful for people who got the same problem.

Background color in input and text fields

The best solution is the attribute selector in CSS (input[type="text"]) as the others suggested.

But if you have to support Internet Explorer 6, you cannot use it (QuirksMode). Well, only if you have to and also are willing to support it.

In this case your only option seems to be to define classes on input elements.

<input type="text" class="input-box" ... />
<input type="submit" class="button" ... />
...

and target them with a class selector:

input.input-box, textarea { background: cyan; }

Convert string in base64 to image and save on filesystem in Python

If you are trying to decode a web image you can simply use this :

import base64

with open("imageToSave.png", "wb") as fh:
  fh.write(base64.urlsafe_b64decode('data'))

data => is the encoded string

It will take care of the padding errors

How do I update a model value in JavaScript in a Razor view?

The model (@Model) only exists while the page is being constructed. Once the page is rendered in the browser, all that exists is HTML, JavaScript and CSS.

What you will want to do is put the PostID in a hidden field. As the PostID value is fixed, there actually is no need for JavaScript. A simple @HtmlHiddenFor will suffice.

However, you will want to change your foreach loop to a for loop. The final solution will look something like this:

for (int i = 0 ; i < Model.Post; i++)
{
    <br/>
    <b>Posted by :</b> @Model.Post[i].Username <br/>
    <span>@Model.Post[i].Content</span> <br/>
    if(Model.loginuser == Model.username)
    {
        @Html.HiddenFor(model => model.Post[i].PostID)
        @Html.TextAreaFor(model => model.addcomment.Content)
        <button type="submit">Add Comment</button>
    }
}

Printing *s as triangles in Java?

For center triangle

      Scanner sc = new Scanner(System.in);
      int n=sc.nextInt();
      int b=(n-1)*2;  
      for(int i=1;i<=n;i++){
      int t= i;
      for(int k=1;k<=b;k++){
      System.out.print(" ");
       }
       if(i!=1){
        t=i*2-1;
       }
       for(int j=1;j<=t;j++){
       System.out.print("*");
       if(j!=t){
       System.out.print(" ");
       }
        }
        System.out.println();
            b=b-2;  
        }

output:

            *
          * * *

Can I animate absolute positioned element with CSS transition?

You forgot to define the default value for left so it doesn't know how to animate.

.test {
    left: 0;
    transition:left 1s linear;
}

See here: http://jsfiddle.net/shomz/yFy5n/5/

How to remove/ignore :hover css style on touch devices

2020 Solution - CSS only - No Javascript

Use media hover with media pointer will help you guys resolve this issue. Tested on chrome Web and android mobile. I known this old question but I didn't find any solution like this.

_x000D_
_x000D_
@media (hover: hover) and (pointer: fine) {
  a:hover { color: red; }
}
_x000D_
<a href="#" >Some Link</a>
_x000D_
_x000D_
_x000D_

Summarizing multiple columns with dplyr?

We can summarize by using summarize_at, summarize_all and summarize_if on dplyr 0.7.4. We can set the multiple columns and functions by using vars and funs argument as below code. The left-hand side of funs formula is assigned to suffix of summarized vars. In the dplyr 0.7.4, summarise_each(and mutate_each) is already deprecated, so we cannot use these functions.

options(scipen = 100, dplyr.width = Inf, dplyr.print_max = Inf)

library(dplyr)
packageVersion("dplyr")
# [1] ‘0.7.4’

set.seed(123)
df <- data_frame(
  a = sample(1:5, 10, replace=T), 
  b = sample(1:5, 10, replace=T), 
  c = sample(1:5, 10, replace=T), 
  d = sample(1:5, 10, replace=T), 
  grp = as.character(sample(1:3, 10, replace=T)) # For convenience, specify character type
)

df %>% group_by(grp) %>% 
  summarise_each(.vars = letters[1:4],
                 .funs = c(mean="mean"))
# `summarise_each()` is deprecated.
# Use `summarise_all()`, `summarise_at()` or `summarise_if()` instead.
# To map `funs` over a selection of variables, use `summarise_at()`
# Error: Strings must match column names. Unknown columns: mean

You should change to the following code. The following codes all have the same result.

# summarise_at
df %>% group_by(grp) %>% 
  summarise_at(.vars = letters[1:4],
               .funs = c(mean="mean"))

df %>% group_by(grp) %>% 
  summarise_at(.vars = names(.)[1:4],
               .funs = c(mean="mean"))

df %>% group_by(grp) %>% 
  summarise_at(.vars = vars(a,b,c,d),
               .funs = c(mean="mean"))

# summarise_all
df %>% group_by(grp) %>% 
  summarise_all(.funs = c(mean="mean"))

# summarise_if
df %>% group_by(grp) %>% 
  summarise_if(.predicate = function(x) is.numeric(x),
               .funs = funs(mean="mean"))
# A tibble: 3 x 5
# grp a_mean b_mean c_mean d_mean
# <chr>  <dbl>  <dbl>  <dbl>  <dbl>
# 1     1   2.80   3.00    3.6   3.00
# 2     2   4.25   2.75    4.0   3.75
# 3     3   3.00   5.00    1.0   2.00

You can also have multiple functions.

df %>% group_by(grp) %>% 
  summarise_at(.vars = letters[1:2],
               .funs = c(Mean="mean", Sd="sd"))
# A tibble: 3 x 5
# grp a_Mean b_Mean      a_Sd     b_Sd
# <chr>  <dbl>  <dbl>     <dbl>    <dbl>
# 1     1   2.80   3.00 1.4832397 1.870829
# 2     2   4.25   2.75 0.9574271 1.258306
# 3     3   3.00   5.00        NA       NA

How to extract text from an existing docx file using python-docx

Using python-docx, as @Chinmoy Panda 's answer shows:

for para in doc.paragraphs:
    fullText.append(para.text)

However, para.text will lost the text in w:smarttag (Corresponding github issue is here: https://github.com/python-openxml/python-docx/issues/328), you should use the following function instead:

def para2text(p):
    rs = p._element.xpath('.//w:t')
    return u" ".join([r.text for r in rs])

Get top n records for each group of grouped results

Try this:

SELECT a.person, a.group, a.age FROM person AS a WHERE 
(SELECT COUNT(*) FROM person AS b 
WHERE b.group = a.group AND b.age >= a.age) <= 2 
ORDER BY a.group ASC, a.age DESC

DEMO

ADB No Devices Found

I had turned all settings in developer mode, but adb was still not showing any devices.

I was not using the cable that came with my phone. Once I switched to it, everything just worked.

Determine if two rectangles overlap each other?

Lets say the two rectangles are rectangle A and rectangle B. Let their centers be A1 and B1 (coordinates of A1 and B1 can be easily found out), let the heights be Ha and Hb, width be Wa and Wb, let dx be the width(x) distance between A1 and B1 and dy be the height(y) distance between A1 and B1.

Now we can say we can say A and B overlap: when

if(!(dx > Wa+Wb)||!(dy > Ha+Hb)) returns true

How do I remove the first characters of a specific column in a table?

Try this. 100% working

UPDATE Table_Name
SET RIGHT(column_name, LEN(column_name) - 1)

  

AngularJS - Passing data between pages

You need to create a service to be able to share data between controllers.

app.factory('myService', function() {
 var savedData = {}
 function set(data) {
   savedData = data;
 }
 function get() {
  return savedData;
 }

 return {
  set: set,
  get: get
 }

});

In your controller A:

myService.set(yourSharedData);

In your controller B:

$scope.desiredLocation = myService.get();

Remember to inject myService in the controllers by passing it as a parameter.

how to prevent adding duplicate keys to a javascript array

The logic is wrong. Consider this:

x = ["a","b","c"]
x[0]     // "a"
x["0"]   // "a"
0 in x   // true
"0" in x // true
x.hasOwnProperty(0)   // true
x.hasOwnProperty("0") // true

There is no reason to loop to check for key (or indices for arrays) existence. Now, values are a different story...

Happy coding

Python Sets vs Lists

I would recommend a Set implementation where the use case is limit to referencing or search for existence and Tuple implementation where the use case requires you to perform iteration. A list is a low-level implementation and requires significant memory overhead.

org.json.simple cannot be resolved

I was facing same issue in my Spring Integration project. I added below JSON dependencies in pom.xml file. It works for me.

<dependency>
  <groupId>org.json</groupId>
  <artifactId>json</artifactId>
  <version>20090211</version>
</dependency>

A list of versions can be found here: https://mvnrepository.com/artifact/org.json/json

How do I split a string on a delimiter in Bash?

Okay guys!

Here's my answer!

DELIMITER_VAL='='

read -d '' F_ABOUT_DISTRO_R <<"EOF"
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS"
NAME="Ubuntu"
VERSION="14.04.4 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.4 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
EOF

SPLIT_NOW=$(awk -F$DELIMITER_VAL '{for(i=1;i<=NF;i++){printf "%s\n", $i}}' <<<"${F_ABOUT_DISTRO_R}")
while read -r line; do
   SPLIT+=("$line")
done <<< "$SPLIT_NOW"
for i in "${SPLIT[@]}"; do
    echo "$i"
done

Why this approach is "the best" for me?

Because of two reasons:

  1. You do not need to escape the delimiter;
  2. You will not have problem with blank spaces. The value will be properly separated in the array!

[]'s

Java Loop every minute

You can use Timer

Timer timer = new Timer();

timer.schedule( new TimerTask() {
    public void run() {
       // do your work 
    }
 }, 0, 60*1000);

When the times comes

  timer.cancel();

To shut it down.

Best way to integrate Python and JavaScript?

Use Js2Py to translate JavaScript to Python, this is the only tool available :)

Remove or adapt border of frame of legend using matplotlib

One more related question, since it took me forever to find the answer:

How to make the legend background blank (i.e. transparent, not white):

legend = plt.legend()
legend.get_frame().set_facecolor('none')

Warning, you want 'none' (the string). None means the default color instead.

Image change every 30 seconds - loop

You should take a look at various javascript libraries, they should be able to help you out:

All of them have tutorials, and fade in/fade out is a basic usage.

For e.g. in jQuery:

var $img = $("img"), i = 0, speed = 200;
window.setInterval(function() {
  $img.fadeOut(speed, function() {
    $img.attr("src", images[(++i % images.length)]);
    $img.fadeIn(speed);
  });
}, 30000);

Replace one character with another in Bash

In bash, you can do pattern replacement in a string with the ${VARIABLE//PATTERN/REPLACEMENT} construct. Use just / and not // to replace only the first occurrence. The pattern is a wildcard pattern, like file globs.

string='foo bar qux'
one="${string/ /.}"     # sets one to 'foo.bar qux'
all="${string// /.}"    # sets all to 'foo.bar.qux'

JavaScript "cannot read property "bar" of undefined

Just check for it before you pass to your function. So you would pass:

thing.foo ? thing.foo.bar : undefined

Get pixel color from canvas, on mousemove

You can try color-sampler. It's an easy way to pick color in a canvas. See demo.

How do you clone a Git repository into a specific folder?

Although all of the answers above are good, I would like to propose a new method instead of using the symbolic link method in public html directory as proposed BEST in the accepted answer. You need to have access to your server virtual host configurations.

It is about configuring virtual host of your web server directly pointing to the repository directory. In Apache you can do it like:

DocumentRoot /var/www/html/website/your-git-repo

Here is an example of a virtual host file:

<VirtualHost *:443>
    ServerName example.com

    DocumentRoot /path/to/your-git-repo
    ...
    ...
    ...
    ...
</VirtualHost>

Creating a thumbnail from an uploaded image

function getExtension($str) 
    {

          $i = strrpos($str,".");
         if (!$i) { return ""; } 

         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
    }

$valid_formats = array("jpg", "png", "gif", "bmp","jpeg","PNG","JPG","JPEG","GIF","BMP");
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST")
    {
        $name = $_FILES['photoimg']['name'];
        $size = $_FILES['photoimg']['size'];

        if(strlen($name))
            {
                 $ext = getExtension($name);
                if(in_array($ext,$valid_formats))
                {
                if($size<(1024*1024))
                    {
                        $actual_image_name = time().substr(str_replace(" ", "_", $txt), 5).".".$ext;
                        $tmp = $_FILES['photoimg']['tmp_name'];
                        if(move_uploaded_file($tmp, $path.$actual_image_name))
                            {


                            mysql_query("INSERT INTO users (uid, profile_image) VALUES ('$session_id' , '$actual_image_name')");

                                echo "<img src='uploads/".$actual_image_name."'  class='preview'>";
                            }
                        else
                            echo "Fail upload folder with read access.";
                    }
                    else
                    echo "Image file size max 1 MB";                    
                    }
                    else
                    echo "Invalid file format..";   
            }

        else
            echo "Please select image..!";

        exit;
    }

Split string, convert ToList<int>() in one line

Better use int.TryParse to avoid exceptions;

var numbers = sNumbers
            .Split(',')
            .Where(x => int.TryParse(x, out _))
            .Select(int.Parse)
            .ToList();

Resizing an iframe based on content

This is slightly tricky as you have to know when the iframe page has loaded, which is difficuly when you're not in control of its content. Its possible to add an onload handler to the iframe, but I've tried this in the past and it has vastly different behaviour across browsers (not guess who's the most annoying...). You'd probably have to add a function to the iframe page that performs the resize and inject some script into the content that either listens to load events or resize events, which then calls the previous function. I'm thinking add a function to the page since you want to make sure its secure, but I have no idea how easy it will be to do.

Pandas count(distinct) equivalent

With new pandas version, it is easy to get as dataframe

unique_count = pd.groupby(['YEARMONTH'], as_index=False).agg(uniq_CLIENTCODE =('CLIENTCODE',pd.Series.count))

Copying files from one directory to another in Java

Use

org.apache.commons.io.FileUtils

It's so handy

SQLite in Android How to update a specific row

you can try this...

db.execSQL("UPDATE DB_TABLE SET YOUR_COLUMN='newValue' WHERE id=6 ");

Is a Python dictionary an example of a hash table?

Yes, it is a hash mapping or hash table. You can read a description of python's dict implementation, as written by Tim Peters, here.

That's why you can't use something 'not hashable' as a dict key, like a list:

>>> a = {}
>>> b = ['some', 'list']
>>> hash(b)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list objects are unhashable
>>> a[b] = 'some'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list objects are unhashable

You can read more about hash tables or check how it has been implemented in python and why it is implemented that way.

What is a practical, real world example of the Linked List?

Waiting line at a teller/cashier, etc...

A series of orders which must be executed in order.

Any FIFO structure can be implemented as a linked list.

Equivalent of typedef in C#

Here is the code for it, enjoy!, I picked that up from the dotNetReference type the "using" statement inside the namespace line 106 http://referencesource.microsoft.com/#mscorlib/microsoft/win32/win32native.cs

using System;
using System.Collections.Generic;
namespace UsingStatement
{
    using Typedeffed = System.Int32;
    using TypeDeffed2 = List<string>;
    class Program
    {
        static void Main(string[] args)
        {
        Typedeffed numericVal = 5;
        Console.WriteLine(numericVal++);

        TypeDeffed2 things = new TypeDeffed2 { "whatever"};
        }
    }
}

How can I count the number of children?

What if you are using this to determine the current selector to find its children so this holds: <ol> then there is <li>s under how to write a selector var count = $(this+"> li").length; wont work..

PHP __get and __set magic methods

Best use magic set/get methods with predefined custom set/get Methods as in example below. This way you can combine best of two worlds. In terms of speed I agree that they are a bit slower but can you even feel the difference. Example below also validate the data array against predefined setters.

"The magic methods are not substitutes for getters and setters. They just allow you to handle method calls or property access that would otherwise result in an error."

This is why we should use both.

CLASS ITEM EXAMPLE

    /*
    * Item class
    */
class Item{
    private $data = array();

    function __construct($options=""){ //set default to none
        $this->setNewDataClass($options); //calling function
    }

    private function setNewDataClass($options){
        foreach ($options as $key => $value) {
            $method = 'set'.ucfirst($key); //capitalize first letter of the key to preserve camel case convention naming
            if(is_callable(array($this, $method))){  //use seters setMethod() to set value for this data[key];      
                $this->$method($value); //execute the setters function
            }else{
                $this->data[$key] = $value; //create new set data[key] = value without seeters;
            }   
        }
    }

    private function setNameOfTheItem($value){ // no filter
        $this->data['name'] = strtoupper($value); //assign the value
        return $this->data['name']; // return the value - optional
    }

    private function setWeight($value){ //use some kind of filter
        if($value >= "100"){ 
            $value = "this item is too heavy - sorry - exceeded weight of maximum 99 kg [setters filter]";
        }
        $this->data['weight'] = strtoupper($value); //asign the value
        return $this->data['weight']; // return the value - optional
    }

    function __set($key, $value){
        $method = 'set'.ucfirst($key); //capitalize first letter of the key to preserv camell case convention naming
        if(is_callable(array($this, $method))){  //use seters setMethod() to set value for this data[key];      
            $this->$method($value); //execute the seeter function
        }else{
            $this->data[$key] = $value; //create new set data[key] = value without seeters;
        }
    }

    function __get($key){
        return $this->data[$key];
    }

    function dump(){
        var_dump($this);
    }
}

INDEX.PHP

$data = array(
    'nameOfTheItem' => 'tv',
    'weight' => '1000',
    'size' => '10x20x30'
);

$item = new Item($data);
$item->dump();

$item->somethingThatDoNotExists = 0; // this key (key, value) will trigger magic function __set() without any control or check of the input,
$item->weight = 99; // this key will trigger predefined setter function of a class - setWeight($value) - value is valid,
$item->dump();

$item->weight = 111; // this key will trigger predefined setter function of a class - setWeight($value) - value invalid - will generate warning.
$item->dump(); // display object info

OUTPUT

object(Item)[1]
  private 'data' => 
    array (size=3)
      'name' => string 'TV' (length=2)
      'weight' => string 'THIS ITEM IS TOO HEAVY - SORRY - EXIDED WEIGHT OF MAXIMUM 99 KG [SETTERS FILTER]' (length=80)
      'size' => string '10x20x30' (length=8)
object(Item)[1]
  private 'data' => 
    array (size=4)
      'name' => string 'TV' (length=2)
      'weight' => string '99' (length=2)
      'size' => string '10x20x30' (length=8)
      'somethingThatDoNotExists' => int 0
object(Item)[1]
  private 'data' => 
    array (size=4)
      'name' => string 'TV' (length=2)
      'weight' => string 'THIS ITEM IS TOO HEAVY - SORRY - EXIDED WEIGHT OF MAXIMUM 99 KG [SETTERS FILTER]' (length=80)
      'size' => string '10x20x30' (length=8)
      'somethingThatDoNotExists' => int 0

java.lang.ClassCastException

ClassA a = <something>;
ClassB b = (ClassB) a;

The 2nd line will fail if ClassA is not a subclass of ClassB, and will throw a ClassCastException.

How to consume a SOAP web service in Java

Here you can find a nice tutorial of how you can create and consume a SOAP service through WSDL. Long story short you need to call wsimport tool from command line (you can find it in your jdk) with parameters like -s (source for .java files) -d (destination for .class files) and the wsdl link.

$ wsimport -s "C:\workspace\soap\src\main\java\com\test\soap\ws" -d "C:\workspace\soap\target\classes\com\test\soap\ws" http://localhost:8855/soap/test?wsdl

After the stubs are created, you can call the webservices very easy something like:

TestHarnessService harnessService = new TestHarnessService();
ITestApi testApi = harnessService.getBasicHttpBindingITestApi();
testApi.resetLogMemoryTarget();

How to get old Value with onchange() event in text box

A dirty trick I somtimes use, is hiding variables in the 'name' attribute (that I normally don't use for other purposes):

select onFocus=(this.name=this.value) onChange=someFunction(this.name,this.value)><option...

Somewhat unexpectedly, both the old and the new value is then submitted to someFunction(oldValue,newValue)

Page scroll up or down in Selenium WebDriver (Selenium 2) using java

1.To scroll page to the bottom use window.scrollTo(0,document.body.scrollHeight) as parameter

//Code to navigate to bottom

WebDriver driver = new ChromeDriver();
JavascriptExecutor jsExecuter = (JavascriptExecutor)driver;
jsExecuter.executeScript(window.scrollTo(0,document.body.scrollHeight));

2.To scroll page to the top use window.scrollTo(0,document.body.scrollTop) as parameter

//Code to navigate to top

WebDriver driver = new ChromeDriver();
JavascriptExecutor jsExecuter = (JavascriptExecutor)driver;
jsExecuter.executeScript(window.scrollTo(0,document.body.scrollTop));

3.To scroll page to the Left use window.scrollTo(0,document.body.scrollLeft) as parameter

//Code to navigate to left

WebDriver driver = new ChromeDriver();
JavascriptExecutor jsExecuter = (JavascriptExecutor)driver;
jsExecuter.executeScript(window.scrollTo(0,document.body.scrollLeft));

4.To scroll to certain point window.scrollTo(0,500) as parameter

//Code to navigate to certain point e.g. 500 is passed as value here

WebDriver driver = new ChromeDriver();
JavascriptExecutor jsExecuter = (JavascriptExecutor)driver;
jsExecuter.executeScript(window.scrollTo(0,500));

To check the navigation directly in browser , open developers tool in browser and navigate to console. Execute the command on console window.scrollTo(0,400) enter image description here

Left Join With Where Clause

The where clause is filtering away rows where the left join doesn't succeed. Move it to the join:

SELECT  `settings`.*, `character_settings`.`value`
FROM    `settings`
LEFT JOIN 
       `character_settings` 
ON     `character_settings`.`setting_id` = `settings`.`id`
        AND `character_settings`.`character_id` = '1'  

Short description of the scoping rules?

Where is x found?

x is not found as you haven't defined it. :-) It could be found in code1 (global) or code3 (local) if you put it there.

code2 (class members) aren't visible to code inside methods of the same class — you would usually access them using self. code4/code5 (loops) live in the same scope as code3, so if you wrote to x in there you would be changing the x instance defined in code3, not making a new x.

Python is statically scoped, so if you pass ‘spam’ to another function spam will still have access to globals in the module it came from (defined in code1), and any other containing scopes (see below). code2 members would again be accessed through self.

lambda is no different to def. If you have a lambda used inside a function, it's the same as defining a nested function. In Python 2.2 onwards, nested scopes are available. In this case you can bind x at any level of function nesting and Python will pick up the innermost instance:

x= 0
def fun1():
    x= 1
    def fun2():
        x= 2
        def fun3():
            return x
        return fun3()
    return fun2()
print fun1(), x

2 0

fun3 sees the instance x from the nearest containing scope, which is the function scope associated with fun2. But the other x instances, defined in fun1 and globally, are not affected.

Before nested_scopes — in Python pre-2.1, and in 2.1 unless you specifically ask for the feature using a from-future-import — fun1 and fun2's scopes are not visible to fun3, so S.Lott's answer holds and you would get the global x:

0 0

Python webbrowser.open() to open Chrome browser

You can call get() with the path to Chrome. Below is an example - replace chrome_path with the correct path for your platform.

import webbrowser

url = 'http://docs.python.org/'

# MacOS
chrome_path = 'open -a /Applications/Google\ Chrome.app %s'

# Windows
# chrome_path = 'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe %s'

# Linux
# chrome_path = '/usr/bin/google-chrome %s'

webbrowser.get(chrome_path).open(url)

Drawing a dot on HTML5 canvas

In my Firefox this trick works:

function SetPixel(canvas, x, y)
{
  canvas.beginPath();
  canvas.moveTo(x, y);
  canvas.lineTo(x+0.4, y+0.4);
  canvas.stroke();
}

Small offset is not visible on screen, but forces rendering engine to actually draw a point.

How to split data into training/testing sets using sample function

Use base R. Function runif generates uniformly distributed values from 0 to 1.By varying cutoff value (train.size in example below), you will always have approximately the same percentage of random records below the cutoff value.

data(mtcars)
set.seed(123)

#desired proportion of records in training set
train.size<-.7
#true/false vector of values above/below the cutoff above
train.ind<-runif(nrow(mtcars))<train.size

#train
train.df<-mtcars[train.ind,]


#test
test.df<-mtcars[!train.ind,]

Laravel Update Query

This error would suggest that User::where('email', '=', $userEmail)->first() is returning null, rather than a problem with updating your model.

Check that you actually have a User before attempting to change properties on it, or use the firstOrFail() method.

$UpdateDetails = User::where('email', $userEmail)->first();

if (is_null($UpdateDetails)) {
    return false;
}

or using the firstOrFail() method, theres no need to check if the user is null because this throws an exception (ModelNotFoundException) when a model is not found, which you can catch using App::error() http://laravel.com/docs/4.2/errors#handling-errors

$UpdateDetails = User::where('email', $userEmail)->firstOrFail();

How to refresh an access form

You can repaint and / or requery:

On the close event of form B:

Forms!FormA.Requery

Is this what you mean?

Creating a LinkedList class from scratch

Sure, a Linked List is a bit confusing for programming n00bs, pretty much the temptation is to look at it as Russian Dolls, because that's what it seems like, a LinkedList Object in a LinkedList Object. But that's a touch difficult to visualize, instead look at it like a computer.

LinkedList = Data + Next Member

Where it's the last member of the list if next is NULL

So a 5 member LinkedList would be:

LinkedList(Data1, LinkedList(Data2, LinkedList(Data3, LinkedList(Data4, LinkedList(Data5, NULL)))))

But you can think of it as simply:

Data1 -> Data2 -> Data3 -> Data4 -> Data5 -> NULL

So, how do we find the end of this? Well, we know that the NULL is the end so:

public void append(LinkedList myNextNode) {
  LinkedList current = this; //Make a variable to store a pointer to this LinkedList
  while (current.next != NULL) { //While we're not at the last node of the LinkedList
    current = current.next; //Go further down the rabbit hole.
  }
  current.next = myNextNode; //Now we're at the end, so simply replace the NULL with another Linked List!
  return; //and we're done!
}

This is very simple code of course, and it will infinitely loop if you feed it a circularly linked list! But that's the basics.

How do I sort a VARCHAR column in SQL server that contains numbers?

 SELECT *,
       ROW_NUMBER()OVER(ORDER BY CASE WHEN ISNUMERIC (ID)=1 THEN CONVERT(NUMERIC(20,2),SUBSTRING(Id, PATINDEX('%[0-9]%', Id), LEN(Id)))END DESC)Rn ---- numerical
        FROM
            (

        SELECT '1'Id UNION ALL
        SELECT '25.20' Id UNION ALL

    SELECT 'A115' Id UNION ALL
    SELECT '2541' Id UNION ALL
    SELECT '571.50' Id UNION ALL
    SELECT '67' Id UNION ALL
    SELECT 'B48' Id UNION ALL
    SELECT '500' Id UNION ALL
    SELECT '147.54' Id UNION ALL
    SELECT 'A-100' Id
    )A

    ORDER BY 
    CASE WHEN ISNUMERIC (ID)=0                                /* alphabetical sort */ 
         THEN CASE WHEN PATINDEX('%[0-9]%', Id)=0
                   THEN LEFT(Id,PATINDEX('%[0-9]%',Id))
                   ELSE LEFT(Id,PATINDEX('%[0-9]%',Id)-1)
              END
    END DESC

how to automatically scroll down a html page?

You can use two different techniques to achieve this.

The first one is with javascript: set the scrollTop property of the scrollable element (e.g. document.body.scrollTop = 1000;).

The second is setting the link to point to a specific id in the page e.g.

<a href="mypage.html#sectionOne">section one</a>

Then if in your target page you'll have that ID the page will be scrolled automatically.

Java: is there a map function?

There is no notion of a function in the JDK as of java 6.

Guava has a Function interface though and the
Collections2.transform(Collection<E>, Function<E,E2>)
method provides the functionality you require.

Example:

// example, converts a collection of integers to their
// hexadecimal string representations
final Collection<Integer> input = Arrays.asList(10, 20, 30, 40, 50);
final Collection<String> output =
    Collections2.transform(input, new Function<Integer, String>(){

        @Override
        public String apply(final Integer input){
            return Integer.toHexString(input.intValue());
        }
    });
System.out.println(output);

Output:

[a, 14, 1e, 28, 32]

These days, with Java 8, there is actually a map function, so I'd probably write the code in a more concise way:

Collection<String> hex = input.stream()
                              .map(Integer::toHexString)
                              .collect(Collectors::toList);

Is it possible to have multiple statements in a python lambda expression?

Using begin() from here: http://www.reddit.com/r/Python/comments/hms4z/ask_pyreddit_if_you_were_making_your_own/c1wycci

Python 3.2 (r32:88445, Mar 25 2011, 19:28:28) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> lst = [[567,345,234],[253,465,756, 2345],[333,777,111, 555]]
>>> begin = lambda *args: args[-1]
>>> list(map(lambda x: begin(x.sort(), x[1]), lst))
[345, 465, 333]

Setting Environment Variables for Node to retrieve

I highly recommend looking into the dotenv package.

https://github.com/motdotla/dotenv

It's kind of similar to the library suggested within the answer from @Benxamin, but it's a lot cleaner and doesn't require any bash scripts. Also worth noting that the code base is popular and well maintained.

Basically you need a .env file (which I highly recommend be ignored from your git/mercurial/etc):

FOO=bar
BAZ=bob

Then in your application entry file put the following line in as early as possible:

require('dotenv').config();

Boom. Done. 'process.env' will now contain the variables above:

console.log(process.env.FOO);
// bar

The '.env' file isn't required so you don't need to worry about your app falling over in it's absence.

Deserialize JSON with Jackson into Polymorphic Types - A Complete Example is giving me a compile error

As promised, I'm putting an example for how to use annotations to serialize/deserialize polymorphic objects, I based this example in the Animal class from the tutorial you were reading.

First of all your Animal class with the Json Annotations for the subclasses.

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

@JsonIgnoreProperties(ignoreUnknown = true)
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY)
@JsonSubTypes({
    @JsonSubTypes.Type(value = Dog.class, name = "Dog"),

    @JsonSubTypes.Type(value = Cat.class, name = "Cat") }
)
public abstract class Animal {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

Then your subclasses, Dog and Cat.

public class Dog extends Animal {

    private String breed;

    public Dog() {

    }

    public Dog(String name, String breed) {
        setName(name);
        setBreed(breed);
    }

    public String getBreed() {
        return breed;
    }

    public void setBreed(String breed) {
        this.breed = breed;
    }
}

public class Cat extends Animal {

    public String getFavoriteToy() {
        return favoriteToy;
    }

    public Cat() {}

    public Cat(String name, String favoriteToy) {
        setName(name);
        setFavoriteToy(favoriteToy);
    }

    public void setFavoriteToy(String favoriteToy) {
        this.favoriteToy = favoriteToy;
    }

    private String favoriteToy;

}

As you can see, there is nothing special for Cat and Dog, the only one that know about them is the abstract class Animal, so when deserializing, you'll target to Animal and the ObjectMapper will return the actual instance as you can see in the following test:

public class Test {

    public static void main(String[] args) {

        ObjectMapper objectMapper = new ObjectMapper();

        Animal myDog = new Dog("ruffus","english shepherd");

        Animal myCat = new Cat("goya", "mice");

        try {
            String dogJson = objectMapper.writeValueAsString(myDog);

            System.out.println(dogJson);

            Animal deserializedDog = objectMapper.readValue(dogJson, Animal.class);

            System.out.println("Deserialized dogJson Class: " + deserializedDog.getClass().getSimpleName());

            String catJson = objectMapper.writeValueAsString(myCat);

            Animal deseriliazedCat = objectMapper.readValue(catJson, Animal.class);

            System.out.println("Deserialized catJson Class: " + deseriliazedCat.getClass().getSimpleName());



        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

Output after running the Test class:

{"@type":"Dog","name":"ruffus","breed":"english shepherd"}

Deserialized dogJson Class: Dog

{"@type":"Cat","name":"goya","favoriteToy":"mice"}

Deserialized catJson Class: Cat

Hope this helps,

Jose Luis

How to print jquery object/array

var arrofobject = [{"id":"197","category":"Damskie"},{"id":"198","category":"M\u0119skie"}];

$.each(arrofobject, function(index, val) {
    console.log(val.category);
});

Difference between Mutable objects and Immutable objects

Immutable Object's state cannot be altered.

for example String.

String str= "abc";//a object of string is created
str  = str + "def";// a new object of string is created and assigned to str

JavaScript: Collision detection

Here's a very simple bounding rectangle routine. It expects both a and b to be objects with x, y, width and height properties:

function isCollide(a, b) {
    return !(
        ((a.y + a.height) < (b.y)) ||
        (a.y > (b.y + b.height)) ||
        ((a.x + a.width) < b.x) ||
        (a.x > (b.x + b.width))
    );
}

To see this function in action, here's a codepen graciously made by @MixerOID.

Python function overloading

I think your basic requirement is to have a C/C++-like syntax in Python with the least headache possible. Although I liked Alexander Poluektov's answer it doesn't work for classes.

The following should work for classes. It works by distinguishing by the number of non-keyword arguments (but it doesn't support distinguishing by type):

class TestOverloading(object):
    def overloaded_function(self, *args, **kwargs):
        # Call the function that has the same number of non-keyword arguments.
        getattr(self, "_overloaded_function_impl_" + str(len(args)))(*args, **kwargs)

    def _overloaded_function_impl_3(self, sprite, start, direction, **kwargs):
        print "This is overload 3"
        print "Sprite: %s" % str(sprite)
        print "Start: %s" % str(start)
        print "Direction: %s" % str(direction)

    def _overloaded_function_impl_2(self, sprite, script):
        print "This is overload 2"
        print "Sprite: %s" % str(sprite)
        print "Script: "
        print script

And it can be used simply like this:

test = TestOverloading()

test.overloaded_function("I'm a Sprite", 0, "Right")
print
test.overloaded_function("I'm another Sprite", "while x == True: print 'hi'")

Output:

This is overload 3
Sprite: I'm a Sprite
Start: 0
Direction: Right

This is overload 2
Sprite: I'm another Sprite
Script:
while x == True: print 'hi'

Creating a JSON response using Django and Python

I use this, it works fine.

from django.utils import simplejson
from django.http import HttpResponse

def some_view(request):
    to_json = {
        "key1": "value1",
        "key2": "value2"
    }
    return HttpResponse(simplejson.dumps(to_json), mimetype='application/json')

Alternative:

from django.utils import simplejson

class JsonResponse(HttpResponse):
    """
        JSON response
    """
    def __init__(self, content, mimetype='application/json', status=None, content_type=None):
        super(JsonResponse, self).__init__(
            content=simplejson.dumps(content),
            mimetype=mimetype,
            status=status,
            content_type=content_type,
        )

In Django 1.7 JsonResponse objects have been added to the Django framework itself which makes this task even easier:

from django.http import JsonResponse
def some_view(request):
    return JsonResponse({"key": "value"})

Format bytes to kilobytes, megabytes, gigabytes

Simple function

function formatBytes($size, $precision = 0){
    $unit = ['Byte','KiB','MiB','GiB','TiB','PiB','EiB','ZiB','YiB'];

    for($i = 0; $size >= 1024 && $i < count($unit)-1; $i++){
        $size /= 1024;
    }

    return round($size, $precision).' '.$unit[$i];
}

echo formatBytes('1876144', 2);
//returns 1.79 MiB

Android transparent status bar and actionbar

I'm developing an app that needs to look similar in all devices with >= API14 when it comes to actionbar and statusbar customization. I've finally found a solution and since it took a bit of my time I'll share it to save some of yours. We start by using an appcompat-21 dependency.

Transparent Actionbar:

values/styles.xml:

<style name="AppTheme" parent="Theme.AppCompat.Light">
...
</style>

<style name="AppTheme.ActionBar.Transparent" parent="AppTheme">
    <item name="android:windowContentOverlay">@null</item>
    <item name="windowActionBarOverlay">true</item>
    <item name="colorPrimary">@android:color/transparent</item>
</style>

<style name="AppTheme.ActionBar" parent="AppTheme">
    <item name="windowActionBarOverlay">false</item>
    <item name="colorPrimary">@color/default_yellow</item>
</style>


values-v21/styles.xml:

<style name="AppTheme" parent="Theme.AppCompat.Light">
    ...
</style>

<style name="AppTheme.ActionBar.Transparent" parent="AppTheme">
    <item name="colorPrimary">@android:color/transparent</item>
</style>

<style name="AppTheme.ActionBar" parent="AppTheme">
    <item name="colorPrimaryDark">@color/bg_colorPrimaryDark</item>
    <item name="colorPrimary">@color/default_yellow</item>
</style>

Now you can use these themes in your AndroidManifest.xml to specify which activities will have a transparent or colored ActionBar:

    <activity
            android:name=".MyTransparentActionbarActivity"
            android:theme="@style/AppTheme.ActionBar.Transparent"/>

    <activity
            android:name=".MyColoredActionbarActivity"
            android:theme="@style/AppTheme.ActionBar"/>

enter image description here enter image description here enter image description here enter image description here enter image description here

Note: in API>=21 to get the Actionbar transparent you need to get the Statusbar transparent too, otherwise will not respect your colour styles and will stay light-grey.



Transparent Statusbar (only works with API>=19):
This one it's pretty simple just use the following code:

protected void setStatusBarTranslucent(boolean makeTranslucent) {
        if (makeTranslucent) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        } else {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

But you'll notice a funky result: enter image description here

This happens because when the Statusbar is transparent the layout will use its height. To prevent this we just need to:

SOLUTION ONE:
Add this line android:fitsSystemWindows="true" in your layout view container of whatever you want to be placed bellow the Actionbar:

    ...
        <LinearLayout
                android:fitsSystemWindows="true"
                android:layout_width="match_parent"
                android:layout_height="match_parent">
            ...
        </LinearLayout>
    ...

SOLUTION TWO:
Add a few lines to our previous method:

protected void setStatusBarTranslucent(boolean makeTranslucent) {
        View v = findViewById(R.id.bellow_actionbar);
        if (v != null) {
            int paddingTop = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT ? MyScreenUtils.getStatusBarHeight(this) : 0;
            TypedValue tv = new TypedValue();
            getTheme().resolveAttribute(android.support.v7.appcompat.R.attr.actionBarSize, tv, true);
            paddingTop += TypedValue.complexToDimensionPixelSize(tv.data, getResources().getDisplayMetrics());
            v.setPadding(0, makeTranslucent ? paddingTop : 0, 0, 0);
        }

        if (makeTranslucent) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        } else {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

Where R.id.bellow_actionbar will be the layout container view id of whatever we want to be placed bellow the Actionbar:

...
    <LinearLayout
            android:id="@+id/bellow_actionbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        ...
    </LinearLayout>
...

enter image description here

So this is it, it think I'm not forgetting something. In this example I didn't use a Toolbar but I think it'll have the same result. This is how I customize my Actionbar:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        View vg = getActionBarView();
        getWindow().requestFeature(vg != null ? Window.FEATURE_ACTION_BAR : Window.FEATURE_NO_TITLE);

        super.onCreate(savedInstanceState);
        setContentView(getContentView());

        if (vg != null) {
            getSupportActionBar().setCustomView(vg, new ActionBar.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            getSupportActionBar().setDisplayShowCustomEnabled(true);
            getSupportActionBar().setDisplayShowHomeEnabled(false);
            getSupportActionBar().setDisplayShowTitleEnabled(false);
            getSupportActionBar().setDisplayUseLogoEnabled(false);
        }
        setStatusBarTranslucent(true);
    }

Note: this is an abstract class that extends ActionBarActivity
Hope it helps!

Jenkins Pipeline Wipe Out Workspace

We make sure we are working with a clean workspace by using a feature of the git plugin. You can add additional behaviors like 'Clean before checkout'. We use this as well for 'Prune stale remote-tracking branches'.

cannot connect to pc-name\SQLEXPRESS

try using IP instead of pc name. If the ip working, then it might be the name pipe is not enable. If it;s still not working then the login using windows might be disabled.

Increase distance between text and title on the y-axis

From ggplot2 2.0.0 you can use the margin = argument of element_text() to change the distance between the axis title and the numbers. Set the values of the margin on top, right, bottom, and left side of the element.

ggplot(mpg, aes(cty, hwy)) + geom_point()+
  theme(axis.title.y = element_text(margin = margin(t = 0, r = 20, b = 0, l = 0)))

margin can also be used for other element_text elements (see ?theme), such as axis.text.x, axis.text.y and title.

addition

in order to set the margin for axis titles when the axis has a different position (e.g., with scale_x_...(position = "top"), you'll need a different theme setting - e.g. axis.title.x.top. See https://github.com/tidyverse/ggplot2/issues/4343.

How to disable XDebug

I had following Problem: Even if I set

xdebug.remote_enable=0 

Xdebug-Error-Message-Decoration was shown.

My solution:

xdebug.default_enable=0

Only if I use this Flag, Xdebug was disabled.

How to copy file from one location to another location?

  public static void copyFile(File oldLocation, File newLocation) throws IOException {
        if ( oldLocation.exists( )) {
            BufferedInputStream  reader = new BufferedInputStream( new FileInputStream(oldLocation) );
            BufferedOutputStream  writer = new BufferedOutputStream( new FileOutputStream(newLocation, false));
            try {
                byte[]  buff = new byte[8192];
                int numChars;
                while ( (numChars = reader.read(  buff, 0, buff.length ) ) != -1) {
                    writer.write( buff, 0, numChars );
                }
            } catch( IOException ex ) {
                throw new IOException("IOException when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
            } finally {
                try {
                    if ( reader != null ){                      
                        writer.close();
                        reader.close();
                    }
                } catch( IOException ex ){
                    Log.e(TAG, "Error closing files when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() ); 
                }
            }
        } else {
            throw new IOException("Old location does not exist when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() );
        }
    }  

Javascript/DOM: How to remove all events of a DOM object?

You can add a helper function that clears event listener for example

function clearEventListener(element) {
 const clonedElement = element.cloneNode(true);
element.replaceWith(clonedElement);
return clonedElement;
}

just pass in the element to the function and that's it...

How do you store Java objects in HttpSession?

Here you can do it by using HttpRequest or HttpSession. And think your problem is within the JSP.

If you are going to use the inside servlet do following,

Object obj = new Object();
session.setAttribute("object", obj);

or

HttpSession session = request.getSession();
Object obj = new Object();
session.setAttribute("object", obj);

and after setting your attribute by using request or session, use following to access it in the JSP,

<%= request.getAttribute("object")%>

or

<%= session.getAttribute("object")%>

So seems your problem is in the JSP.

If you want use scriptlets it should be as follows,

<%
Object obj = request.getSession().getAttribute("object");
out.print(obj);
%>

Or can use expressions as follows,

<%= session.getAttribute("object")%>

or can use EL as follows, ${object} or ${sessionScope.object}

If (Array.Length == 0)

Jon Skeet answered correctly. Just remember that the order of the test in the "IF" is important. Check for the null before the length. I also prefer to put the null on the left side of the equal which is a habit I got from Java that made the code more efficient and fast… I don't think it's important in a lot of application today, but it's a good practice!

if (null == array || array.Length == 0)

How to show first commit by 'git log'?

I found that:

git log --reverse

shows commits from start.

Android camera intent

Try the following I found Here's a link

If your app targets M and above and declares as using the CAMERA permission which is not granted, then attempting to use this action will result in a SecurityException.

EasyImage.openCamera(Activity activity, int type);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    EasyImage.handleActivityResult(requestCode, resultCode, data, this, new DefaultCallback() {
        @Override
        public void onImagePickerError(Exception e, EasyImage.ImageSource source, int type) {
            //Some error handling
        }

        @Override
        public void onImagesPicked(List<File> imagesFiles, EasyImage.ImageSource source, int type) {
            //Handle the images
            onPhotosReturned(imagesFiles);
        }
    });
}

CSS Font "Helvetica Neue"

Most windows users won't have that font on their computers. Also, you can't just submit it to your server and call it using font-face because this isn't a free font...

And last, but not least, answering the question that nobody mentioned yet, Helvetica and Helvetica Neue do not render well on screen unless they have a really big font-size. You'll find a lot of pages using this font, and in all of them you'll see that the top border of a line of text looks wavy and that some letters look taller than others. In my opinion this is the main reason why you shouldn't use it. There are other options for you to use, like Open Sans.

What to do about Eclipse's "No repository found containing: ..." error messages?

The updates that Eclipse has found have dependencies that need to be downloaded during the installation but which cannot currently be found. This may be a temporary network problem or some repo server being down (if you're lucky). But unfortunately, sometimes this simply means that the dependencies are not contained in the repositories that Eclipse is trying to download them from, at least that is what i have encountered every now and then (not annoyingly often though).

So either the failure is temporary and you should try again or you are out of luck and may have to use a manual installation procedure (download and unpack in plugins folder).

Maybe you can increase your success rate by adding the repositories that supposedly contain the artifacts in the 'Available Software Sites' dialogue.

I'm not 100% sure of that though. In fact, I would like to find a 'perfect' answer to this question myself.

What usually works quite well is installing plugins via the Eclipse Marketplace.

Oh and sometimes this helps: Uncheck some options (like OSGI in your case).

How to display the string html contents into webbrowser control?

Here is a little code. It works (for me) at any subsequent html code change of the WebBrowser control. You may adapt it to your specific needs.

    static public void SetWebBrowserHtml(WebBrowser Browser, string HtmlText)
    {
        if (Browser != null)
        {
            if (string.IsNullOrWhiteSpace(HtmlText))
            {
                // Putting a div inside body forces control to use div instead of P (paragraph)
                // when the user presses the enter button
                HtmlText = 
                        @"<html>
                    <head>
                    <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"" />
                    </head>
                      <div></div>
                    <body>
                    </body>
                    </html>";
            }

            if (Browser.Document == null)
            {
                Browser.Navigate("about:blank");

                //Wait for document to finish loading
                while (Browser.ReadyState != WebBrowserReadyState.Complete)
                {
                    Application.DoEvents();
                    System.Threading.Thread.Sleep(5);
                }
            }

            // Write html code
            dynamic Doc = Browser.Document.DomDocument;
            Doc.open();
            Doc.write(HtmlText);
            Doc.close();


            // Add scripts here 
            /*  
            dynamic Doc = Document.DomDocument;
            dynamic Script = Doc.getElementById("MyScriptFunctions");
            if (Script == null)
            {
                Script = Doc.createElement("script");
                Script.id = "MyScriptFunctions";
                Script.text = JavascriptFunctionsSourcecode;
                Doc.appendChild(Script);
            }                 
            */



            // Enable contentEditable   
            /*  
            if (Browser.Document.Body != null)
            {
                if (Browser.Version.Major >= 9)
                    Browser.Document.Body.SetAttribute("contentEditable", "true");
            }             
             */

            // Attach event handlers
            // Browser.Document.AttachEventHandler("onkeyup", BrowserKeyUp);
            // Browser.Document.AttachEventHandler("onkeypress", BrowserKeyPress);
            // etc...
        }
    }        

How to get file name from file path in android

add this library

  implementation group: 'commons-io', name: 'commons-io', version: '2.6'

then call FilenameUtils class

   val getFileName = FilenameUtils.getName("Your File path")

javax vs java package

The javax namespace is usually (that's a loaded word) used for standard extensions, currently known as optional packages. The standard extensions are a subset of the non-core APIs; the other segment of the non-core APIs obviously called the non-standard extensions, occupying the namespaces like com.sun.* or com.ibm.. The core APIs take up the java. namespace.

Not everything in the Java API world starts off in core, which is why extensions are usually born out of JSR requests. They are eventually promoted to core based on 'wise counsel'.

The interest in this nomenclature, came out of a faux pas on Sun's part - extensions could have been promoted to core, i.e. moved from javax.* to java.* breaking the backward compatibility promise. Programmers cried hoarse, and better sense prevailed. This is why, the Swing API although part of the core, continues to remain in the javax.* namespace. And that is also how packages get promoted from extensions to core - they are simply made available for download as part of the JDK and JRE.

How to stop C# console applications from closing automatically?

Those solutions mentioned change how your program work.

You can off course put #if DEBUG and #endif around the Console calls, but if you really want to prevent the window from closing only on your dev machine under Visual Studio or if VS isn't running only if you explicitly configure it, and you don't want the annoying 'Press any key to exit...' when running from the command line, the way to go is to use the System.Diagnostics.Debugger API's.

If you only want that to work in DEBUG, simply wrap this code in a [Conditional("DEBUG")] void BreakConditional() method.

// Test some configuration option or another
bool launch;
var env = Environment.GetEnvironmentVariable("LAUNCH_DEBUGGER_IF_NOT_ATTACHED");
if (!bool.TryParse(env, out launch))
    launch = false;

// Break either if a debugger is already attached, or if configured to launch
if (launch || Debugger.IsAttached) {
    if (Debugger.IsAttached || Debugger.Launch())
        Debugger.Break();
}

This also works to debug programs that need elevated privileges, or that need to be able to elevate themselves.

Redeploy alternatives to JRebel

I have written an article about DCEVM: Spring-mvc + Velocity + DCEVM

I think it's worth it, since my environment is running without any problems.

Difference between maven scope compile and provided for JAR packaging

If jar file is like executable spring boot jar file then scope of all dependencies must be compile to include all jar files.

But if jar file used in other packages or applications then it does not need to include all dependencies in jar file because these packages or applications can provide other dependencies themselves.

How to sort a list of lists by a specific index of the inner list?

I think lambda function can solve your problem.

old_list = [[0,1,'f'], [4,2,'t'],[9,4,'afsd']]

#let's assume we want to sort lists by last value ( old_list[2] )
new_list = sorted(old_list, key=lambda x: x[2])

#Resulst of new_list will be:

[[9, 4, 'afsd'], [0, 1, 'f'], [4, 2, 't']]

C# Validating input for textbox on winforms

With WinForms you can use the ErrorProvider in conjunction with the Validating event to handle the validation of user input. The Validating event provides the hook to perform the validation and ErrorProvider gives a nice consistent approach to providing the user with feedback on any error conditions.

http://msdn.microsoft.com/en-us/library/system.windows.forms.errorprovider.aspx

How to make a checkbox checked with jQuery?

$('#checkbox').prop('checked', true);

When you want it unchecked:

$('#checkbox').prop('checked', false);

How to append elements at the end of ArrayList in Java?

import java.util.*;


public class matrixcecil {
    public static void main(String args[]){
        List<Integer> k1=new ArrayList<Integer>(10);
        k1.add(23);
        k1.add(10);
        k1.add(20);
        k1.add(24);
        int i=0;
        while(k1.size()<10){
            if(i==(k1.get(k1.size()-1))){

            }
             i=k1.get(k1.size()-1);
             k1.add(30);
             i++;
             break;
        }
        System.out.println(k1);
    }

}

I think this example will help you for better solution.

Transaction count after EXECUTE indicates a mismatching number of BEGIN and COMMIT statements. Previous count = 1, current count = 0

Avoid using

RETURN

statement when you are using

BEGIN TRY
    ... 
END TRY

BEGIN CATCH
    ...
END CATCH

and

BEGIN, COMMIT & ROLLBACK

statements in SQL stored procedures

Call a stored procedure with another in Oracle

Sure, you just call it from within the SP, there's no special syntax.

Ex:

   PROCEDURE some_sp
   AS
   BEGIN
      some_other_sp('parm1', 10, 20.42);
   END;

If the procedure is in a different schema than the one the executing procedure is in, you need to prefix it with schema name.

   PROCEDURE some_sp
   AS
   BEGIN
      other_schema.some_other_sp('parm1', 10, 20.42);
   END;

Difference between static class and singleton pattern?

What makes you say that either a singleton or a static method isn't thread-safe? Usually both should be implemented to be thread-safe.

The big difference between a singleton and a bunch of static methods is that singletons can implement interfaces (or derive from useful base classes, although that's less common, in my experience), so you can pass around the singleton as if it were "just another" implementation.

changing the owner of folder in linux

Use chown to change ownership and chmod to change rights.

use the -R option to apply the rights for all files inside of a directory too.

Note that both these commands just work for directories too. The -R option makes them also change the permissions for all files and directories inside of the directory.

For example

sudo chown -R username:group directory

will change ownership (both user and group) of all files and directories inside of directory and directory itself.

sudo chown username:group directory

will only change the permission of the folder directory but will leave the files and folders inside the directory alone.

you need to use sudo to change the ownership from root to yourself.

Edit:

Note that if you use chown user: file (Note the left-out group), it will use the default group for that user.

Also You can change the group ownership of a file or directory with the command:

chgrp group_name file/directory_name

You must be a member of the group to which you are changing ownership to.

You can find group of file as follows

# ls -l file
-rw-r--r-- 1 root family 0 2012-05-22 20:03 file

# chown sujit:friends file

User 500 is just a normal user. Typically user 500 was the first user on the system, recent changes (to /etc/login.defs) has altered the minimum user id to 1000 in many distributions, so typically 1000 is now the first (non root) user.

What you may be seeing is a system which has been upgraded from the old state to the new state and still has some processes knocking about on uid 500. You can likely change it by first checking if your distro should indeed now use 1000, and if so alter the login.defs file yourself, the renumber the user account in /etc/passwd and chown/chgrp all their files, usually in /home/, then reboot.

But in answer to your question, no, you should not really be worried about this in all likelihood. It'll be showing as "500" instead of a username because o user in /etc/passwd has a uid set of 500, that's all.

Also you can show your current numbers using id i'm willing to bet it comes back as 1000 for you.

test if display = none

As @Agent_9191 and @partick mentioned you should use

$('tbody :visible').highlight(myArray[i]); // works for all children of tbody that are visible

or

$('tbody:visible').highlight(myArray[i]); // works for all visible tbodys

Additionally, since you seem to be applying a class to the highlighted words, instead of using jquery to alter the background for all matched highlights, just create a css rule with the background color you need and it gets applied directly once you assign the class.

.highlight { background-color: #FFFF88; }

Does Visual Studio Code have box select/multi-line edit?

The shortcuts I use in Visual Studio for multiline (aka box) select are Shift + Alt + up/down/left/right

To create this in Visual Studio Code you can add these keybindings to the keybindings.json file (menu FilePreferencesKeyboard shortcuts).

{ "key": "shift+alt+down", "command": "editor.action.insertCursorBelow",
                                 "when": "editorTextFocus" },
{ "key": "shift+alt+up", "command": "editor.action.insertCursorAbove",
                                 "when": "editorTextFocus" },
{ "key": "shift+alt+right", "command": "cursorRightSelect",
                                     "when": "editorTextFocus" },
{ "key": "shift+alt+left", "command": "cursorLeftSelect",
                                     "when": "editorTextFocus" }

Decode Hex String in Python 3

The answers from @unbeli and @Niklas are good, but @unbeli's answer does not work for all hex strings and it is desirable to do the decoding without importing an extra library (codecs). The following should work (but will not be very efficient for large strings):

>>> result = bytes.fromhex((lambda s: ("%s%s00" * (len(s)//2)) % tuple(s))('4a82fdfeff00')).decode('utf-16-le')
>>> result == '\x4a\x82\xfd\xfe\xff\x00'
True

Basically, it works around having invalid utf-8 bytes by padding with zeros and decoding as utf-16.

how to implement a long click listener on a listview

This worked for me for cardView and will work the same for listview inside adapter calss, within onBindViewHolder() function

holder.cardView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                return false;
            }
        });

Enable VT-x in your BIOS security settings (refer to documentation for your computer)

Even after enabling Intel Virtualization Technology (Intel VT-x), I got the error message ' dev/kvm not found ' in Android Studio.by making Hyper-V feature off in Windows 8.1 issue was fixed.

here is how to access Windows Hyper-V feature

Control Panel -> Programs and Features -> Turn Windows features on and off.

Perform an action in every sub-directory using Bash

Handy one-liners

for D in *; do echo "$D"; done
for D in *; do find "$D" -type d; done ### Option A

find * -type d ### Option B

Option A is correct for folders with spaces in between. Also, generally faster since it doesn't print each word in a folder name as a separate entity.

# Option A
$ time for D in ./big_dir/*; do find "$D" -type d > /dev/null; done
real    0m0.327s
user    0m0.084s
sys     0m0.236s

# Option B
$ time for D in `find ./big_dir/* -type d`; do echo "$D" > /dev/null; done
real    0m0.787s
user    0m0.484s
sys     0m0.308s

Python debugging tips

If you are using pdb, you can define aliases for shortcuts. I use these:

# Ned's .pdbrc

# Print a dictionary, sorted. %1 is the dict, %2 is the prefix for the names.
alias p_ for k in sorted(%1.keys()): print "%s%-15s= %-80.80s" % ("%2",k,repr(%1[k]))

# Print the instance variables of a thing.
alias pi p_ %1.__dict__ %1.

# Print the instance variables of self.
alias ps pi self

# Print the locals.
alias pl p_ locals() local:

# Next and list, and step and list.
alias nl n;;l
alias sl s;;l

# Short cuts for walking up and down the stack
alias uu u;;u
alias uuu u;;u;;u
alias uuuu u;;u;;u;;u
alias uuuuu u;;u;;u;;u;;u
alias dd d;;d
alias ddd d;;d;;d
alias dddd d;;d;;d;;d
alias ddddd d;;d;;d;;d;;d

Not connecting to SQL Server over VPN

Try changing Server name with its IP for example

SERVERNAME//SQLSERVER -> 192.168.0.2//SQLSERVER

its work flawlessly with me using VPN

How do I animate constraint changes?

Swift solution:

yourConstraint.constant = 50
UIView.animate(withDuration: 1.0, animations: {
    yourView.layoutIfNeeded
})

php codeigniter count rows

public function number_row()
 {
    $query = $this->db->select("count(user_details.id) as number")
                       ->get('user_details');              
      if($query-> num_rows()>0)
      {
          return $query->row();
      } 
      else
      {
          return false;
      } 
   }

JavaScript implementation of Gzip

I guess a generic client-side JavaScript compression implementation would be a very expensive operation in terms of processing time as opposed to transfer time of a few more HTTP packets with uncompressed payload.

Have you done any testing that would give you an idea how much time there is to save? I mean, bandwidth savings can't be what you're after, or can it?

How to generate an entity-relationship (ER) diagram using Oracle SQL Developer

Since SQL Developer 3, it's pretty straightforward (they could've made it easier).

  1. Go to «View → Data Modeler → Browser». The browser will show up as one of the tabs along the left-hand side.
  2. Click on the «Browser» tab, expand the design (probably called Untitled_1), right-click «Relational Models» and select «New Relational Model».
  3. Right click on the newly created relational model (probably Relational_1) and select «Show».
  4. Then just drag the tables you want (from e.g. the «Connections» tab) onto the model.  Note when you click on the first table in the Connections tab, SQLDeveloper opens that table in the right: select all the tables from the left, then ensure the Relational_1 tab (or whatever name) is the active one in the rhs before you drag them over, because it has probably switched to one of the tables you clicked in the lhs.

Cannot deserialize instance of object out of START_ARRAY token in Spring Webservice

I've had a very similar issue using spring-boot-starter-data-redis. To my implementation there was offered a @Bean for RedisTemplate as follows:

@Bean
public RedisTemplate<String, List<RoutePlantCache>> redisTemplate(RedisConnectionFactory connectionFactory) {
    final RedisTemplate<String, List<RoutePlantCache>> template = new RedisTemplate<>();
    template.setConnectionFactory(connectionFactory);
    template.setKeySerializer(new StringRedisSerializer());
    template.setValueSerializer(new Jackson2JsonRedisSerializer<>(RoutePlantCache.class));

    // Add some specific configuration here. Key serializers, etc.
    return template;
}

The fix was to specify an array of RoutePlantCache as following:

template.setValueSerializer(new Jackson2JsonRedisSerializer<>(RoutePlantCache[].class));

Below the exception I had:

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `[...].RoutePlantCache` out of START_ARRAY token
 at [Source: (byte[])"[{ ... },{ ... [truncated 1478 bytes]; line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1468) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1242) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1190) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeFromArray(BeanDeserializer.java:604) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:190) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:166) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4526) ~[jackson-databind-2.11.4.jar:2.11.4]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3572) ~[jackson-databind-2.11.4.jar:2.11.4]

How Do I 'git fetch' and 'git merge' from a Remote Tracking Branch (like 'git pull')

Git pull is actually a combo tool: it runs git fetch (getting the changes) and git merge (merging them with your current copy)

Are you sure you are on the correct branch?

Postgresql column reference "id" is ambiguous

SELECT (vg.id, name) FROM v_groups vg 
INNER JOIN people2v_groups p2vg ON vg.id = p2vg.v_group_id
WHERE p2vg.people_id = 0;

Using ORDER BY and GROUP BY together

Here is the simplest solution

select m_id,v_id,max(timestamp) from table group by m_id;

Group by m_id but get max of timestamp for each m_id.

HTML image not showing in Gmail

Please also check your encoding: Google encodes spaces as + instead of %20. This may result in an invalid image link.

Module 'tensorflow' has no attribute 'contrib'

This issue might be helpful for you, it explains how to achieve TPUStrategy, a popular functionality of tf.contrib in TF<2.0.

So, in TF 1.X you could do the following:

resolver = tf.contrib.cluster_resolver.TPUClusterResolver('grpc://' + os.environ['COLAB_TPU_ADDR'])
tf.contrib.distribute.initialize_tpu_system(resolver)
strategy = tf.contrib.distribute.TPUStrategy(resolver)

And in TF>2.0, where tf.contrib is deprecated, you achieve the same by:

tf.config.experimental_connect_to_host('grpc://' + os.environ['COLAB_TPU_ADDR'])
resolver = tf.distribute.cluster_resolver.TPUClusterResolver('grpc://' + os.environ['COLAB_TPU_ADDR'])
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver) 

How to redirect to Index from another controller?

You can use local redirect. Following codes are jumping the HomeController's Index page:

public class SharedController : Controller
    {
        // GET: /<controller>/
        public IActionResult _Layout(string btnLogout)
        {
            if (btnLogout != null)
            {
                return LocalRedirect("~/Index");
            }

            return View();
        }
}

How do I define a method which takes a lambda as a parameter in Java 8?

To use Lambda expression you need to either create your own functional interface or use Java functional interface for operation that require two integer and return as value. IntBinaryOperator

Using user defined functional interface

interface TwoArgInterface {

    public int operation(int a, int b);
}

public class MyClass {

    public static void main(String javalatte[]) {
        // this is lambda expression
        TwoArgInterface plusOperation = (a, b) -> a + b;
        System.out.println("Sum of 10,34 : " + plusOperation.operation(10, 34));

    }
}

Using Java functional interface

import java.util.function.IntBinaryOperator;

public class MyClass1 {

    static void main(String javalatte[]) {
        // this is lambda expression
        IntBinaryOperator plusOperation = (a, b) -> a + b;
        System.out.println("Sum of 10,34 : " + plusOperation.applyAsInt(10, 34));

    }
}

How can I replace every occurrence of a String in a file with PowerShell?

Use (V3 version):

(Get-Content c:\temp\test.txt).replace('[MYID]', 'MyValue') | Set-Content c:\temp\test.txt

Or for V2:

(Get-Content c:\temp\test.txt) -replace '\[MYID\]', 'MyValue' | Set-Content c:\temp\test.txt

How to handle Pop-up in Selenium WebDriver using Java

Do not make the situation complex. Use ID if they are available.

driver.get("http://www.rediff.com");
WebElement sign = driver.findElement(By.linkText("Sign in"));
sign.click();
WebElement email_id= driver.findElement(By.id("c_uname"));
email_id.sendKeys("hi");

Integer division: How do you produce a double?

If you change the type of one the variables you have to remember to sneak in a double again if your formula changes, because if this variable stops being part of the calculation the result is messed up. I make a habit of casting within the calculation, and add a comment next to it.

double d = 5 / (double) 20; //cast to double, to do floating point calculations

Note that casting the result won't do it

double d = (double)(5 / 20); //produces 0.0

How to delete a workspace in Eclipse?

Just go to the \eclipse-java-helios-SR2-win32\eclipse\configuration.settings directory and change or remove org.eclipse.ui.ide.prefs file.

Twitter - How to embed native video from someone else's tweet into a New Tweet or a DM

I eventually figured out an easy way to do it:

  1. On your Twitter feed, click the date/time of the tweet containing the video. That will open the single tweet view
  2. Look for the down-pointing arrow at the top-right corner of the tweet, click it to open drop-down menue
  3. Select the "Embed Video" option and copy the HTML embed code and Paste it to Notepad
  4. Find the last "t.co" shortened URL inside the HTML code (should be something like this: https://``t.co/tQM43ftXyM). Copy this URL and paste it in a new browser tab.
  5. The browser will expand the shortened URL to something which looks like this: https://twitter.com/UserName/status/828267001496784896/video/1

This is the link to the Twitter Card containing the native video. Pasting this link in a new tweet or DM will include the native video in it!

cc1plus: error: unrecognized command line option "-std=c++11" with g++

you should try this

g++-4.4 -std=c++0x or g++-4.7 -std=c++0x

YouTube embedded video: set different thumbnail

Your best bet would be to use the tutorial on http://orangecountycustomwebsitedesign.com/change-the-youtube-embed-image-to-custom-image/#comment-7289. This will ensure there is no double clicking and that YouTube's video doesn't autoplay behind your image prior to clicking it.

Do not plug in the YouTube embed code as YT(YouTube) gives it (you can try, but it will be ganky)...instead just replace the source from the embed code of your vid UP TO "&autoplay=1" (leave this on the end as it is).

eg.)

Original code YT gives:

`<object width="420" height="315"><param name="movie" value="//www.youtube.com/v/5mEymdGuEJk?hl=en_US&amp;version=3"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="//www.youtube.com/v/5mEymdGuEJkhl=en_US&amp;version=3" type="application/x-shockwave-flash" width="420" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>`

Code used in tutorial with same YT src:

`<object width="420" height="315" classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"><param name="allowFullScreen" value="true" /><param name="allowscriptaccess"value="always" /><param name="src" value="http://www.youtube.com/v/5mEymdGuEJk?version=3&amp;hl=en_US&amp;autoplay=1" /><param name="allowfullscreen" value="true" /><embed width="420" height="315" type="application/x-shockwave-flash" src="http://www.youtube.com/v/5mEymdGuEJk?version=3&amp;hl=en_US&amp;autoplay=1" allowFullScreen="true" allowscriptaccess="always" allowfullscreen="true" /></object>`

Other than that, just replace the img source and path with your own, and voilà!

Error Code 1292 - Truncated incorrect DOUBLE value - Mysql

This message means you're trying to compare a number and a string in a WHERE or ON clause. In your query, the only potential place where that could be occurring is ON ac.company_code = ta.company_code; either make sure they have similar declarations, or use an explicit CAST to convert the number to a string.

If you turn off strict mode, the error should turn into a warning.

How to generate a Dockerfile from an image?

It is not possible at this point (unless the author of the image explicitly included the Dockerfile).

However, it is definitely something useful! There are two things that will help to obtain this feature.

  1. Trusted builds (detailed in this docker-dev discussion
  2. More detailed metadata in the successive images produced by the build process. In the long run, the metadata should indicate which build command produced the image, which means that it will be possible to reconstruct the Dockerfile from a sequence of images.

version `CXXABI_1.3.8' not found (required by ...)

GCC 4.9 introduces a newer C++ ABI version than your system libstdc++ has, so you need to tell the loader to use this newer version of the library by adding that path to LD_LIBRARY_PATH. Unfortunately, I cannot tell you straight off where the libstdc++ so for your GCC 4.9 installation is located, as this depends on how you configured GCC. So you need something in the style of:

export LD_LIBRARY_PATH=/home/user/lib/gcc-4.9.0/lib:/home/user/lib/boost_1_55_0/stage/lib:$LD_LIBRARY_PATH

Note the actual path may be different (there might be some subdirectory hidden under there, like `x86_64-unknown-linux-gnu/4.9.0´ or similar).

How to install JDK 11 under Ubuntu?

For anyone running a JDK on Ubuntu and want to upgrade to JDK11, I'd recommend installing via sdkman. SDKMAN is a tool for switching JVMs, removing and upgrading.

SDKMAN is a tool for managing parallel versions of multiple Software Development Kits on most Unix based systems. It provides a convenient Command Line Interface (CLI) and API for installing, switching, removing and listing Candidates.

Install SDKMAN

$ curl -s "https://get.sdkman.io" | bash
$ source "$HOME/.sdkman/bin/sdkman-init.sh"
$ sdk version

Install Java (11.0.3-zulu)

$ sdk install java

getting the index of a row in a pandas apply function

To answer the original question: yes, you can access the index value of a row in apply(). It is available under the key name and requires that you specify axis=1 (because the lambda processes the columns of a row and not the rows of a column).

Working example (pandas 0.23.4):

>>> import pandas as pd
>>> df = pd.DataFrame([[1,2,3],[4,5,6]], columns=['a','b','c'])
>>> df.set_index('a', inplace=True)
>>> df
   b  c
a      
1  2  3
4  5  6
>>> df['index_x10'] = df.apply(lambda row: 10*row.name, axis=1)
>>> df
   b  c  index_x10
a                 
1  2  3         10
4  5  6         40

Angular HttpClient "Http failure during parsing"

You can specify that the data to be returned is not JSON using responseType.

In your example, you can use a responseType string value of text, like this:

return this.http.post(
    'http://10.0.1.19/login',
    {email, password},
    {responseType: 'text'})

The full list of options for responseType is:

  • json (the default)
  • text
  • arraybuffer
  • blob

See the docs for more information.

Visual Studio Community 2015 expiration date

I am running VSCommunity 2015 in Win8.1 virtual machine installed inside a Parallels 11 virtual machine installed on my Mac OSX El Capitan. To my surprise and delight it installed and ran fine. I used it for 2 weeks without signing into my Microsoft account. I tried to login 6 weeks later and got the 30 day trial screen shown above.

However for me I was able to simply click on the link above shown as "Check for an updated license" and was prompted in to log in to my Microsoft account. I did so and it granted me a license successfully and was seamless. Now under License Status it displays as "This product is licensed to: ".

I guess I got lucky as I'm guessing this is how it is supposed to work.

[sidebar]: Over the decades I've disliked most MS products but have been out of the VS IDE development tools game for awhile, and I have to say using VSComm15 has been flawless. Using it to learn C# and the IDE itself for a new contract job and it worked perfectly and has great features.

How to iterate a table rows with JQuery and access some cell values?

do this:

$("tr.item").each(function(i, tr) {
    var value = $("span.value", tr).text();
    var quantity = $("input.quantity", tr).val();
});

IF-THEN-ELSE statements in postgresql

case when field1>0 then field2/field1 else 0 end as field3

c++ compile error: ISO C++ forbids comparison between pointer and integer

You have two ways to fix this. The preferred way is to use:

string answer;

(instead of char). The other possible way to fix it is:

if (answer == 'y') ...

(note single quotes instead of double, representing a char constant).

What is the difference between DSA and RSA?

Referring, https://web.archive.org/web/20140212143556/http://courses.cs.tamu.edu:80/pooch/665_spring2008/Australian-sec-2006/less19.html

RSA
RSA encryption and decryption are commutative
hence it may be used directly as a digital signature scheme
given an RSA scheme {(e,R), (d,p,q)}
to sign a message M, compute:
S = M power d (mod R)
to verify a signature, compute:
M = S power e(mod R) = M power e.d(mod R) = M(mod R)

RSA can be used both for encryption and digital signatures, simply by reversing the order in which the exponents are used: the secret exponent (d) to create the signature, the public exponent (e) for anyone to verify the signature. Everything else is identical.

DSA (Digital Signature Algorithm)
DSA is a variant on the ElGamal and Schnorr algorithms. It creates a 320 bit signature, but with 512-1024 bit security again rests on difficulty of computing discrete logarithms has been quite widely accepted.

DSA Key Generation
firstly shared global public key values (p,q,g) are chosen:
choose a large prime p = 2 power L
where L= 512 to 1024 bits and is a multiple of 64
choose q, a 160 bit prime factor of p-1
choose g = h power (p-1)/q
for any h<p-1, h(p-1)/q(mod p)>1
then each user chooses a private key and computes their public key:
choose x<q
compute y = g power x(mod p)

DSA key generation is related to, but somewhat more complex than El Gamal. Mostly because of the use of the secondary 160-bit modulus q used to help speed up calculations and reduce the size of the resulting signature.

DSA Signature Creation and Verification

to sign a message M
generate random signature key k, k<q
compute
r = (g power k(mod p))(mod q)
s = k-1.SHA(M)+ x.r (mod q)
send signature (r,s) with message

to verify a signature, compute:
w = s-1(mod q)
u1= (SHA(M).w)(mod q)
u2= r.w(mod q)
v = (g power u1.y power u2(mod p))(mod q)
if v=r then the signature is verified

Signature creation is again similar to ElGamal with the use of a per message temporary signature key k, but doing calc first mod p, then mod q to reduce the size of the result. Note that the use of the hash function SHA is explicit here. Verification also consists of comparing two computations, again being a bit more complex than, but related to El Gamal.
Note that nearly all the calculations are mod q, and hence are much faster.
But, In contrast to RSA, DSA can be used only for digital signatures

DSA Security
The presence of a subliminal channel exists in many schemes (any that need a random number to be chosen), not just DSA. It emphasises the need for "system security", not just a good algorithm.

notifyDataSetChanged example

You can use the runOnUiThread() method as follows. If you're not using a ListActivity, just adapt the code to get a reference to your ArrayAdapter.

final ArrayAdapter adapter = ((ArrayAdapter)getListAdapter());
runOnUiThread(new Runnable() {
    public void run() {
        adapter.notifyDataSetChanged();
    }
});

What is the difference between String.slice and String.substring?

The difference between substring and slice - is how they work with negative and overlooking lines abroad arguments:

substring (start, end)

Negative arguments are interpreted as zero. Too large values ??are truncated to the length of the string:   alert ( "testme" .substring (-2)); // "testme", -2 becomes 0

Furthermore, if start > end, the arguments are interchanged, i.e. plot line returns between the start and end:

alert ( "testme" .substring (4, -1)); // "test"
// -1 Becomes 0 -> got substring (4, 0)
// 4> 0, so that the arguments are swapped -> substring (0, 4) = "test"

slice

Negative values ??are measured from the end of the line:

alert ( "testme" .slice (-2)); // "me", from the end position 2
alert ( "testme" .slice (1, -1)); // "estm", from the first position to the one at the end.

It is much more convenient than the strange logic substring.

A negative value of the first parameter to substr supported in all browsers except IE8-.

If the choice of one of these three methods, for use in most situations - it will be slice: negative arguments and it maintains and operates most obvious.

fatal: could not create work tree dir 'kivy'

You should do the command in a directory where you have write permission. So:

cd ~/
mkdir code
cd code
git clone https://github.com/kivy/kivy

For example.

dataframe: how to groupBy/count then filter on count in Scala

When you pass a string to the filter function, the string is interpreted as SQL. Count is a SQL keyword and using count as a variable confuses the parser. This is a small bug (you can file a JIRA ticket if you want to).

You can easily avoid this by using a column expression instead of a String:

df.groupBy("x").count()
  .filter($"count" >= 2)
  .show()

Traversing text in Insert mode

I believe Home and End (and PageUp/PageDn) also work normally while in insert mode, but aside from that, I don't believe there are any other standard keys defined for text traversal.

How to highlight text using javascript

Why using a selfmade highlighting function is a bad idea

The reason why it's probably a bad idea to start building your own highlighting function from scratch is because you will certainly run into issues that others have already solved. Challenges:

  • You would need to remove text nodes with HTML elements to highlight your matches without destroying DOM events and triggering DOM regeneration over and over again (which would be the case with e.g. innerHTML)
  • If you want to remove highlighted elements you would have to remove HTML elements with their content and also have to combine the splitted text-nodes for further searches. This is necessary because every highlighter plugin searches inside text nodes for matches and if your keywords will be splitted into several text nodes they will not being found.
  • You would also need to build tests to make sure your plugin works in situations which you have not thought about. And I'm talking about cross-browser tests!

Sounds complicated? If you want some features like ignoring some elements from highlighting, diacritics mapping, synonyms mapping, search inside iframes, separated word search, etc. this becomes more and more complicated.

Use an existing plugin

When using an existing, well implemented plugin, you don't have to worry about above named things. The article 10 jQuery text highlighter plugins on Sitepoint compares popular highlighter plugins.

Have a look at mark.js

mark.js is such a plugin that is written in pure JavaScript, but is also available as jQuery plugin. It was developed to offer more opportunities than the other plugins with options to:

  • search for keywords separately instead of the complete term
  • map diacritics (For example if "justo" should also match "justò")
  • ignore matches inside custom elements
  • use custom highlighting element
  • use custom highlighting class
  • map custom synonyms
  • search also inside iframes
  • receive not found terms

DEMO

Alternatively you can see this fiddle.

Usage example:

// Highlight "keyword" in the specified context
$(".context").mark("keyword");

// Highlight the custom regular expression in the specified context
$(".context").markRegExp(/Lorem/gmi);

It's free and developed open-source on GitHub (project reference).

How to get system time in Java without creating a new Date

This should work:

System.currentTimeMillis();

How do I escape a single quote in SQL Server?

The following syntax will escape you ONLY ONE quotation mark:

SELECT ''''

The result will be a single quote. Might be very helpful for creating dynamic SQL :). enter image description here

TypeError: 'in <string>' requires string as left operand, not int

You simply need to make cab a string:

cab = '6176'

As the error message states, you cannot do <int> in <string>:

>>> 1 in '123'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not int
>>> 

because integers and strings are two totally different things and Python does not embrace implicit type conversion ("Explicit is better than implicit.").

In fact, Python only allows you to use the in operator with a right operand of type string if the left operand is also of type string:

>>> '1' in '123'  # Works!
True
>>>
>>> [] in '123'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not list
>>>
>>> 1.0 in '123'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not float
>>>
>>> {} in '123'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand, not dict
>>>

Cannot install NodeJs: /usr/bin/env: node: No such file or directory

In my case, installing nodejs-legacy solved the issue.

sudo apt-get install nodejs-legacy

Vim delete blank lines

This works for me

:%s/^\s*$\n//gc

No notification sound when sending notification from firebase in android

I was also having a problem with notifications that had to emit sound, when the app was in foreground everything worked correctly, however when the app was in the background the sound just didn't come out.

The notification was sent by the server through FCM, that is, the server mounted the JSON of the notification and sent it to FCM, which then sends the notification to the apps. Even if I put the sound tag, the sound does not come out in the backgound.

enter image description here

Even putting the sound tag it didn't work.

enter image description here

After so much searching I found the solution on a github forum. I then noticed that there were two problems in my case:

1 - It was missing to send the channel_id tag, important to work in API level 26+

enter image description here

2 - In the Android application, for this specific case where notifications were being sent directly from the server, I had to configure the channel id in advance, so in my main Activity I had to configure the channel so that Android knew what to do when notification arrived.

In JSON sent by the server:

   {
  "title": string,
  "body": string,
  "icon": string,
  "color": string,
  "sound": mysound,

  "channel_id": videocall,
  //More stuff here ...
 }

In your main Activity:

 @Background
    void createChannel(){
            Uri sound = Uri.parse("android.resource://" + getApplicationContext().getPackageName() + "/" + R.raw.app_note_call);
            NotificationChannel mChannel;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                mChannel = new NotificationChannel("videocall", "VIDEO CALL", NotificationManager.IMPORTANCE_HIGH);
                mChannel.setLightColor(Color.GRAY);
                mChannel.enableLights(true);
                mChannel.setDescription("VIDEO CALL");
                AudioAttributes audioAttributes = new AudioAttributes.Builder()
                        .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                        .setUsage(AudioAttributes.USAGE_ALARM)
                        .build();
                mChannel.setSound(sound, audioAttributes);

                NotificationManager notificationManager =
                        (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
                notificationManager.createNotificationChannel(mChannel);
            }
    }

This finally solved my problem, I hope it helps someone not to waste 2 days like I did. I don't know if it is necessary for everything I put in the code, but this is the way. I also didn't find the github forum link to credit the answer anymore, because what I did was the same one that was posted there.

HTML/Javascript change div content

Assuming you're not using jQuery or some other library that makes this sort of thing easier for you, you can just use the element's innerHTML property.

document.getElementById("content").innerHTML = "whatever";

Run chrome in fullscreen mode on Windows

Running chrome.exe --start-fullscreen --app=https://google.com will not get you Chrome in fullscreen, but in kiosk mode.

However, running chrome --start-fullscreen --app=https://google.com (notice : it's chrome instead of chrome.exe) worked in my case.