Programs & Examples On #Inputbinding

What is the difference between a pandas Series and a single-column DataFrame?

Series is a one-dimensional labeled array capable of holding any data type (integers, strings, floating point numbers, Python objects, etc.). The axis labels are collectively referred to as the index. The basic method to create a Series is to call:

s = pd.Series(data, index=index)

DataFrame is a 2-dimensional labeled data structure with columns of potentially different types. You can think of it like a spreadsheet or SQL table, or a dict of Series objects.

 d = {'one' : pd.Series([1., 2., 3.], index=['a', 'b', 'c']),
 two' : pd.Series([1., 2., 3., 4.], index=['a', 'b', 'c', 'd'])}
 df = pd.DataFrame(d)

What is the difference between == and equals() in Java?

Basically, == compares if two objects have the same reference on the heap, so unless two references are linked to the same object, this comparison will be false.

equals() is a method inherited from Object class. This method by default compares if two objects have the same referece. It means:

object1.equals(object2) <=> object1 == object2

However, if you want to establish equality between two objects of the same class you should override this method. It is also very important to override the method hashCode() if you have overriden equals().

Implement hashCode() when establishing equality is part of the Java Object Contract. If you are working with collections, and you haven't implemented hashCode(), Strange Bad Things could happen:

HashMap<Cat, String> cats = new HashMap<>();
Cat cat = new Cat("molly");
cats.put(cat, "This is a cool cat");
System.out.println(cats.get(new Cat("molly"));

null will be printed after executing the previous code if you haven't implemented hashCode().

How can I add 1 day to current date?

In my humble opinion the best way is to just add a full day in milliseconds, depending on how you factor your code it can mess up if your on the last day of the month.

for example Feb 28 or march 31.

Here is an example of how i would do it:

var current = new Date(); //'Mar 11 2015' current.getTime() = 1426060964567
var followingDay = new Date(current.getTime() + 86400000); // + 1 day in ms
followingDay.toLocaleDateString();

imo this insures accuracy

here is another example i Do not like that can work for you but not as clean that dose the above

var today = new Date('12/31/2015');
var tomorrow = new Date(today);
tomorrow.setDate(today.getDate()+1);
tomorrow.toLocaleDateString();

imho this === 'POOP'

So some of you have had gripes about my millisecond approach because of day light savings time. So Im going to bash this out. First, Some countries and states do not have Day light savings time. Second Adding exactly 24 hours is a full day. If the date number dose not change once a year but then gets fixed 6 months later i don't see a problem there. But for the purpose of being definite and having to deal with allot the evil Date() i have thought this through and now thoroughly hate Date. So this is my new Approach

var dd = new Date(); // or any date and time you care about 
var dateArray =  dd.toISOString().split('T')[0].split('-').concat( dd.toISOString().split('T')[1].split(':') );
// ["2016", "07", "04", "00", "17", "58.849Z"] at Z 

Now for the fun part!

var date = { 
    day: dateArray[2],
    month: dateArray[1],
    year: dateArray[0],
    hour: dateArray[3],
    minutes: dateArray[4],
    seconds:dateArray[5].split('.')[0],
    milliseconds: dateArray[5].split('.')[1].replace('Z','')
}

now we have our Official Valid international Date Object clearly written out at Zulu meridian. Now to change the date

  dd.setDate(dd.getDate()+1); // this gives you one full calendar date forward
  tomorrow.setDate(dd.getTime() + 86400000);// this gives your 24 hours into the future. do what you want with it.

Ruby get object keys as array

hash = {"apple" => "fruit", "carrot" => "vegetable"}
array = hash.keys   #=> ["apple", "carrot"]

it's that simple

Checking for an empty field with MySQL

You could use

IFNULL(email, '') > ''

jQuery.post( ) .done( ) and success:

Both .done() and .success() are callback functions and they essentially function the same way.

Here's the documentation. The difference is that .success() is deprecated as of jQuery 1.8. You should use .done() instead.

In case you don't want to click the link:

Deprecation Notice

The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callback methods introduced in jQuery 1.5 are deprecated as of jQuery 1.8. To prepare your code for their eventual removal, use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead.

Most efficient way to remove special characters from string

I wonder if a Regex-based replacement (possibly compiled) is faster. Would have to test that Someone has found this to be ~5 times slower.

Other than that, you should initialize the StringBuilder with an expected length, so that the intermediate string doesn't have to be copied around while it grows.

A good number is the length of the original string, or something slightly lower (depending on the nature of the functions inputs).

Finally, you can use a lookup table (in the range 0..127) to find out whether a character is to be accepted.

Select * from subquery

You can select every column from that sub-query by aliasing it and adding the alias before the *:

SELECT t.*, a+b AS total_sum
FROM
(
   SELECT SUM(column1) AS a, SUM(column2) AS b
   FROM table
) t

Sleep function in Windows, using C

Use:

#include <windows.h>

Sleep(sometime_in_millisecs); // Note uppercase S

And here's a small example that compiles with MinGW and does what it says on the tin:

#include <windows.h>
#include <stdio.h>

int main() {
    printf( "starting to sleep...\n" );
    Sleep(3000); // Sleep three seconds
    printf("sleep ended\n");
}

"Failed to load platform plugin "xcb" " while launching qt5 app on linux without qt installed

I link all Qt stuff statically to the generic Linux builds of my open source projects. It makes life a bit easier. You just need to build static versions of Qt libraries first. Of course this cannot be applied to closed source software due to licensing issues. The deployment of Qt5 apps on Linux is currently a bit problematic, because Ubuntu 12.04, for example, doesn't have Qt5 libraries in the package repositories.

Error: Argument is not a function, got undefined

Could it be as simple as enclosing your asset in " " and whatever needs quotes on the inside with ' '?

<link rel="stylesheet" media="screen" href="@routes.Assets.at("stylesheets/main.css")">

becomes

<link rel="stylesheet" media="screen" href="@routes.Assets.at('stylesheets/main.css')">

That could be causing some problems with parsing

Get the index of the object inside an array, matching a condition

You can use the Array.prototype.some() in the following way (as mentioned in the other answers):

https://jsfiddle.net/h1d69exj/2/

function findIndexInData(data, property, value) {
    var result = -1;
    data.some(function (item, i) {
        if (item[property] === value) {
            result = i;
            return true;
        }
    });
    return result;
}
var data = [{prop1:"abc",prop2:"qwe"},{prop1:"bnmb",prop2:"yutu"},{prop1:"zxvz",prop2:"qwrq"}]



alert(findIndexInData(data, 'prop2', "yutu")); // shows index of 1

When use ResponseEntity<T> and @RestController for Spring RESTful applications

ResponseEntity is meant to represent the entire HTTP response. You can control anything that goes into it: status code, headers, and body.

@ResponseBody is a marker for the HTTP response body and @ResponseStatus declares the status code of the HTTP response.

@ResponseStatus isn't very flexible. It marks the entire method so you have to be sure that your handler method will always behave the same way. And you still can't set the headers. You'd need the HttpServletResponse or a HttpHeaders parameter.

Basically, ResponseEntity lets you do more.

CSS background image URL failing to load

You are using a local path. Is that really what you want? If it is, you need to use the file:/// prefix:

file:///H:/media/css/static/img/sprites/buttons-v3-10.png

obviously, this will work only on your local computer.

Also, in many modern browsers, this works only if the page itself is also on a local file path. Addressing local files from remote (http://, https://) pages has been widely disabled due to security reasons.

Very simple log4j2 XML configuration file using Console and File appender

Here is my simplistic log4j2.xml that prints to console and writes to a daily rolling file:

// java
private static final Logger LOGGER = LogManager.getLogger(MyClass.class);


// log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Properties>
        <Property name="logPath">target/cucumber-logs</Property>
        <Property name="rollingFileName">cucumber</Property>
    </Properties>
    <Appenders>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
        </Console>
        <RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
            <Policies>
                <!-- Causes a rollover if the log file is older than the current JVM's start time -->
                <OnStartupTriggeringPolicy />
                <!-- Causes a rollover once the date/time pattern no longer applies to the active file -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="DEBUG" additivity="false">
            <AppenderRef ref="console" />
            <AppenderRef ref="rollingFile" />
        </Root>
    </Loggers>
</Configuration>

TimeBasedTriggeringPolicy

interval (integer) - How often a rollover should occur based on the most specific time unit in the date pattern. For example, with a date pattern with hours as the most specific item and and increment of 4 rollovers would occur every 4 hours. The default value is 1.

modulate (boolean) - Indicates whether the interval should be adjusted to cause the next rollover to occur on the interval boundary. For example, if the item is hours, the current hour is 3 am and the interval is 4 then the first rollover will occur at 4 am and then next ones will occur at 8 am, noon, 4pm, etc.

Source: https://logging.apache.org/log4j/2.x/manual/appenders.html

Output:

[INFO ] 2018-07-21 12:03:47,412 ScenarioHook.beforeScenario() - Browser=CHROME32_NOHEAD
[INFO ] 2018-07-21 12:03:48,623 ScenarioHook.beforeScenario() - Screen Resolution (WxH)=1366x768
[DEBUG] 2018-07-21 12:03:52,125 HomePageNavigationSteps.I_Am_At_The_Home_Page() - Base URL=http://simplydo.com/projector/
[DEBUG] 2018-07-21 12:03:52,700 NetIncomeProjectorSteps.I_Enter_My_Start_Balance() - Start Balance=348000

A new log file will be created daily with previous day automatically renamed to:

cucumber_yyyy-MM-dd.log

In a Maven project, you would put the log4j2.xml in src/main/resources or src/test/resources.

Can't include C++ headers like vector in Android NDK

In android NDK go to android-ndk-r9b>/sources/cxx-stl/gnu-libstdc++/4.X/include in linux machines

I've found solution from the below link http://osdir.com/ml/android-ndk/2011-09/msg00336.html

Generating Random Number In Each Row In Oracle Query

If you just use round then the two end numbers (1 and 9) will occur less frequently, to get an even distribution of integers between 1 and 9 then:

SELECT MOD(Round(DBMS_RANDOM.Value(1, 99)), 9) + 1 FROM DUAL

How to include view/partial specific styling in AngularJS

I know this question is old now, but after doing a ton of research on various solutions to this problem, I think I may have come up with a better solution.

UPDATE 1: Since posting this answer, I have added all of this code to a simple service that I have posted to GitHub. The repo is located here. Feel free to check it out for more info.

UPDATE 2: This answer is great if all you need is a lightweight solution for pulling in stylesheets for your routes. If you want a more complete solution for managing on-demand stylesheets throughout your application, you may want to checkout Door3's AngularCSS project. It provides much more fine-grained functionality.

In case anyone in the future is interested, here's what I came up with:

1. Create a custom directive for the <head> element:

app.directive('head', ['$rootScope','$compile',
    function($rootScope, $compile){
        return {
            restrict: 'E',
            link: function(scope, elem){
                var html = '<link rel="stylesheet" ng-repeat="(routeCtrl, cssUrl) in routeStyles" ng-href="{{cssUrl}}" />';
                elem.append($compile(html)(scope));
                scope.routeStyles = {};
                $rootScope.$on('$routeChangeStart', function (e, next, current) {
                    if(current && current.$$route && current.$$route.css){
                        if(!angular.isArray(current.$$route.css)){
                            current.$$route.css = [current.$$route.css];
                        }
                        angular.forEach(current.$$route.css, function(sheet){
                            delete scope.routeStyles[sheet];
                        });
                    }
                    if(next && next.$$route && next.$$route.css){
                        if(!angular.isArray(next.$$route.css)){
                            next.$$route.css = [next.$$route.css];
                        }
                        angular.forEach(next.$$route.css, function(sheet){
                            scope.routeStyles[sheet] = sheet;
                        });
                    }
                });
            }
        };
    }
]);

This directive does the following things:

  1. It compiles (using $compile) an html string that creates a set of <link /> tags for every item in the scope.routeStyles object using ng-repeat and ng-href.
  2. It appends that compiled set of <link /> elements to the <head> tag.
  3. It then uses the $rootScope to listen for '$routeChangeStart' events. For every '$routeChangeStart' event, it grabs the "current" $$route object (the route that the user is about to leave) and removes its partial-specific css file(s) from the <head> tag. It also grabs the "next" $$route object (the route that the user is about to go to) and adds any of its partial-specific css file(s) to the <head> tag.
  4. And the ng-repeat part of the compiled <link /> tag handles all of the adding and removing of the page-specific stylesheets based on what gets added to or removed from the scope.routeStyles object.

Note: this requires that your ng-app attribute is on the <html> element, not on <body> or anything inside of <html>.

2. Specify which stylesheets belong to which routes using the $routeProvider:

app.config(['$routeProvider', function($routeProvider){
    $routeProvider
        .when('/some/route/1', {
            templateUrl: 'partials/partial1.html', 
            controller: 'Partial1Ctrl',
            css: 'css/partial1.css'
        })
        .when('/some/route/2', {
            templateUrl: 'partials/partial2.html',
            controller: 'Partial2Ctrl'
        })
        .when('/some/route/3', {
            templateUrl: 'partials/partial3.html',
            controller: 'Partial3Ctrl',
            css: ['css/partial3_1.css','css/partial3_2.css']
        })
}]);

This config adds a custom css property to the object that is used to setup each page's route. That object gets passed to each '$routeChangeStart' event as .$$route. So when listening to the '$routeChangeStart' event, we can grab the css property that we specified and append/remove those <link /> tags as needed. Note that specifying a css property on the route is completely optional, as it was omitted from the '/some/route/2' example. If the route doesn't have a css property, the <head> directive will simply do nothing for that route. Note also that you can even have multiple page-specific stylesheets per route, as in the '/some/route/3' example above, where the css property is an array of relative paths to the stylesheets needed for that route.

3. You're done Those two things setup everything that was needed and it does it, in my opinion, with the cleanest code possible.

Hope that helps someone else who might be struggling with this issue as much as I was.

concatenate char array in C

You can concatenate strings by using the sprintf() function. In your case, for example:

char file[80];
sprintf(file,"%s%s",name,extension);

And you'll end having the concatenated string in "file".

Java substring: 'string index out of range'

itemdescription is shorter than 38 chars. Which is why the StringOutOfBoundsException is being thrown.

Checking .length() > 0 simply makes sure the String has some not-null value, what you need to do is check that the length is long enough. You could try:

if(itemdescription.length() > 38)
  ...

How to wrap text around an image using HTML/CSS

you have to float your image container as follows:

HTML

<div id="container">
    <div id="floated">...some other random text</div>
    ...
    some random text
    ...
</div>

CSS

#container{
    width: 400px;
    background: yellow;
}
#floated{
    float: left;
    width: 150px;
    background: red;
}

FIDDLE

http://jsfiddle.net/kYDgL/

Break string into list of characters in Python

Because strings are (immutable) sequences they can be unpacked similar to lists:

with open(filename, 'rU') as fd:
    multiLine = fd.read()
    *lst, = multiLine

When running map(lambda x: x, multiLine) this is clearly more efficient, but in fact it returns a map object instead of a list.

with open(filename, 'rU') as fd:
    multiLine = fd.read()
    list(map(lambda x: x, multiLine))

Turning the map object into a list will take longer than the unpacking method.

How do I create a circle or square with just CSS - with a hollow center?

To my knowledge there is no cross-browser compatible way to make a circle with CSS & HTML only.

For the square I guess you could make a div with a border and a z-index higher than what you are putting it over. I don't understand why you would need to do this, when you could just put a border on the image or "something" itself.

If anyone else knows how to make a circle that is cross browser compatible with CSS & HTML only, I would love to hear about it!

@Caspar Kleijne border-radius does not work in IE8 or below, not sure about 9.

How can I color dots in a xy scatterplot according to column value?

Recently I had to do something similar and I resolved it with the code below. Hope it helps!

Sub ColorCode()
Dim i As Integer
Dim j As Integer
i = 2
j = 1

Do While ActiveSheet.Cells(i, 1) <> ""


If Cells(i, 5).Value = "RED" Then
ActiveSheet.ChartObjects("YourChartName").Chart.FullSeriesCollection(1).Points(j).MarkerForegroundColor = RGB(255, 0, 0)



Else

If Cells(i, 5).Value = "GREEN" Then
ActiveSheet.ChartObjects("YourChartName").Chart.FullSeriesCollection(1).Points(j).MarkerForegroundColor = RGB(0, 255, 0)

Else

If Cells(i, 5).Value = "GREY" Then
ActiveSheet.ChartObjects("YourChartName").Chart.FullSeriesCollection(1).Points(j).MarkerForegroundColor = RGB(192, 192, 192)

Else

If Cells(i, 5).Value = "YELLOW" Then
ActiveSheet.ChartObjects("YourChartName").Chart.FullSeriesCollection(1).Points(j).MarkerForegroundColor = RGB(255, 255, 0)

End If
End If
End If
End If

i = i + 1
j = j + 1

Loop



End Sub

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

If you have MySQL as part of a Docker image (say on port 6606) and an Ubuntu install (on port 3306) specifying the port is not enough:

mysql -u root -p -P 6606

will throw:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

as it's trying to connect to localhost by default, specifying your local IP fixes the issue:

mysql -u root -p -P 6606 -h 127.0.0.1

Apply a theme to an activity in Android?

Before you call setContentView(), call setTheme(android.R.style...) and just replace the ... with the theme that you want(Theme, Theme_NoTitleBar, etc.).

Or if your theme is a custom theme, then replace the entire thing, so you get setTheme(yourThemesResouceId)

ValueError : I/O operation on closed file

Same error can raise by mixing: tabs + spaces.

with open('/foo', 'w') as f:
 (spaces OR  tab) print f       <-- success
 (spaces AND tab) print f       <-- fail

How to insert new row to database with AUTO_INCREMENT column without specifying column names?

Just add the column names, yes you can use Null instead but is is a very bad idea to not use column names in any insert, ever.

Disabling browser print options (headers, footers, margins) from page?

I have a similar request from a client who wants to have the header, page numbers, and html footer removed. In this case, the client is presenting an HTML page that can double as a formal certificate. The added URL, page, and, header, are irrelevant and lead to a less-than-pleasing final product. In some ways, it just looks cheap.

Media=Print has not been able to disable these browser defaults. The only workaround is to tell the user to click the "Gear" button and toggle those items on/off. Seriously, I had no idea I could do that for 20 years (and we think the typical user will have a clue to click the toggle button?).

If CSS supports Media=Print, it should support the ability to control the entire end-user print experience. I appreciate that the browsers provide the added fields, but, why not allow CSS to control the overall print experience-if that is what's desired. A 90% solution could be 100% with three more fields! A simple:

#BrowserPrintDefaults{display:none} 

would suffice.

Again, it's not a matter whether or not the end-user wants to print it out or not (maybe your client is very private and doesn't want printed URLs floating around. Or maybe a executive team uses a private collaboration sites?). Glad to defend the end-user, but if somebody is seeking an answer, don't respond saying it's the right of the end-user to show or hide. Sometimes it's the right of the client paying the bills.

Current Subversion revision command

There is also a more convenient (for some) svnversion command.

Output might be a single revision number or something like this (from -h):

  4123:4168     mixed revision working copy
  4168M         modified working copy
  4123S         switched working copy
  4123:4168MS   mixed revision, modified, switched working copy

I use this python code snippet to extract revision information:

import re
import subprocess

p = subprocess.Popen(["svnversion"], stdout = subprocess.PIPE, 
    stderr = subprocess.PIPE)
p.wait()
m = re.match(r'(|\d+M?S?):?(\d+)(M?)S?', p.stdout.read())
rev = int(m.group(2))
if m.group(3) == 'M':
    rev += 1

Multiline string literal in C#

You can use @ and "".

        string sourse = @"{
        ""items"":[
        {
            ""itemId"":0,
            ""name"":""item0""
        },
        {
            ""itemId"":1,
            ""name"":""item1""
        }
        ]
    }";

Simple JavaScript Checkbox Validation

For now no jquery or php needed. Use just "required" HTML5 input attrbute like here

 <form>
        <p>
            <input class="form-control" type="text" name="email" />
            <input type="submit" value="ok" class="btn btn-success" name="submit" />
            <input type="hidden" name="action" value="0" />
        </p>
        <p><input type="checkbox" required name="terms">I have read and accept <a href="#">SOMETHING Terms and Conditions</a></p>
 </form>

This will validate and prevent any submit before checkbox is opt in. Language independent solution because its generated by users web browser.

click() event is calling twice in jquery

My simple answer was to turn the click bind into a function and call that from the onclick of the element - worked a treat! whereas none of the above did

What is a constant reference? (not a reference to a constant)

The clearest answer. Does “X& const x” make any sense?

No, it is nonsense

To find out what the above declaration means, read it right-to-left: “x is a const reference to a X”. But that is redundant — references are always const, in the sense that you can never reseat a reference to make it refer to a different object. Never. With or without the const.

In other words, “X& const x” is functionally equivalent to “X& x”. Since you’re gaining nothing by adding the const after the &, you shouldn’t add it: it will confuse people — the const will make some people think that the X is const, as if you had said “const X& x”.

Fatal error: Maximum execution time of 30 seconds exceeded

Your loop might be endless. If it is not, you could extend the maximum execution time like this:

ini_set('max_execution_time', '300'); //300 seconds = 5 minutes

and

set_time_limit(300);

can be used to temporarily extend the time limit.

Remove or uninstall library previously added : cocoapods

Remove pod name from Podfile then Open Terminal, set project folder path and Run pod update command.

NOTE: pod update will update all the libraries to the latest version and will also remove those libraries whose name have been removed from podfile.

anaconda - graphviz - can't import after installation

I tried this way and worked for me.

conda install -c anaconda graphviz
pip install graphviz

Check if a variable is of function type

An other simply way:

var fn = function () {}
if (fn.constructor === Function) {
  // true
} else {
  // false
}

How to determine the encoding of text?

It is, in principle, impossible to determine the encoding of a text file, in the general case. So no, there is no standard Python library to do that for you.

If you have more specific knowledge about the text file (e.g. that it is XML), there might be library functions.

Python check if list items are integers?

Try this:

mynewlist = [s for s in mylist if s.isdigit()]

From the docs:

str.isdigit()

Return true if all characters in the string are digits and there is at least one character, false otherwise.

For 8-bit strings, this method is locale-dependent.


As noted in the comments, isdigit() returning True does not necessarily indicate that the string can be parsed as an int via the int() function, and it returning False does not necessarily indicate that it cannot be. Nevertheless, the approach above should work in your case.

find first sequence item that matches a criterion

If you don't have any other indexes or sorted information for your objects, then you will have to iterate until such an object is found:

next(obj for obj in objs if obj.val == 5)

This is however faster than a complete list comprehension. Compare these two:

[i for i in xrange(100000) if i == 1000][0]

next(i for i in xrange(100000) if i == 1000)

The first one needs 5.75ms, the second one 58.3µs (100 times faster because the loop 100 times shorter).

Make div stay at bottom of page's content all the time even when there are scrollbars

This is precisely what position: fixed was designed for:

#footer {
    position: fixed;
    bottom: 0;
    width: 100%;
}

Here's the fiddle: http://jsfiddle.net/uw8f9/

arranging div one below the other

Set the main div CSS to somthing like:

<style>
    .wrapper{
        display:flex;
        flex-direction: column;
    }
</style>

<div id="wrapper">
        <div id="inner1">This is inner div 1</div>
        <div id="inner2">This is inner div 2</div>
</div>

For more flexbox CSS refer: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

How to get the name of the current Windows user in JavaScript

Working for me on IE:

<script type="text/javascript">
  var WinNetwork = new ActiveXObject("WScript.Network");
  document.write(WinNetwork.UserName);
</script>

...but ActiveX controls needs to be on in security settings.

MySQL count occurrences greater than 2

To get a list of the words that appear more than once together with how often they occur, use a combination of GROUP BY and HAVING:

SELECT word, COUNT(*) AS cnt
FROM words
GROUP BY word
HAVING cnt > 1

To find the number of words in the above result set, use that as a subquery and count the rows in an outer query:

SELECT COUNT(*)
FROM
(
    SELECT NULL
    FROM words
    GROUP BY word
    HAVING COUNT(*) > 1
) T1

Laravel 5 Eloquent where and or in Clauses

Also, if you have a variable,

CabRes::where('m_Id', 46)
      ->where('t_Id', 2)
      ->where(function($q) use ($variable){
          $q->where('Cab', 2)
            ->orWhere('Cab', $variable);
      })
      ->get();

How to efficiently check if variable is Array or Object (in NodeJS & V8)?

The Best Way I Can Use My Project.Use hasOwnProperty in Tricky Way!.

var arr = []; (or) arr = new Array();
var obj = {}; (or) arr = new Object();

arr.constructor.prototype.hasOwnProperty('push') //true (This is an Array)

obj.constructor.prototype.hasOwnProperty('push') // false (This is an Object)

multiple conditions for JavaScript .includes() method

You could also do something like this :

_x000D_
_x000D_
const str = "hi, there"_x000D_
_x000D_
const res = str.includes("hello") || str.includes("hi") || str.includes('howdy');_x000D_
_x000D_
console.log(res);
_x000D_
_x000D_
_x000D_

Whenever one of your includes return true, value will be true, otherwise, it's going to be false. This works perfectly fine with ES6.

How to create a GUID/UUID in Python

Check this post, helped me a lot. In short, the best option for me was:

import random 
import string 

# defining function for random 
# string id with parameter 
def ran_gen(size, chars=string.ascii_uppercase + string.digits): 
    return ''.join(random.choice(chars) for x in range(size)) 

# function call for random string 
# generation with size 8 and string  
print (ran_gen(8, "AEIOSUMA23")) 

Because I needed just 4-6 random characters instead of bulky GUID.

Difference between TCP and UDP?

One of the differences is in short

UDP : Send message and dont look back if it reached destination, Connectionless protocol
TCP : Send message and guarantee to reach destination, Connection-oriented protocol

Setting dropdownlist selecteditem programmatically

Just Use this oneliner:

divisions.Items.FindByText("Some Text").Selected = true;
divisions.Items.FindByValue("some value").Selected = true;

where divisions is a dropdownlist control.

Hope it helps someone.

Multiline for WPF TextBox

Also, if, like me, you add controls directly in XAML (not using the editor), you might get frustrated that it won't stretch to the available height, even after setting those two properties.

To make the TextBox stretch, set the Height="Auto".

UPDATE:

In retrospect, I think this must have been necessary thanks to a default style for TextBoxes specifying the height to some standard for the application somewhere in the App resources. It may be worthwhile checking this if this helped you.

Iterate through every file in one directory

Dir has also shorter syntax to get an array of all files from directory:

Dir['dir/to/files/*'].each do |fname|
    # do something with fname
end

Hide header in stack navigator React navigation

This worked for me:

const Routes = createStackNavigator({
Intro: {
    screen: Intro,
    navigationOptions: {
        header: null,
    }
}
},
    {
        initialRouteName: 'Intro',
    }
);

Sort an Array by keys based on another Array?

There you go:

function sortArrayByArray(array $array, array $orderArray) {
    $ordered = array();
    foreach ($orderArray as $key) {
        if (array_key_exists($key, $array)) {
            $ordered[$key] = $array[$key];
            unset($array[$key]);
        }
    }
    return $ordered + $array;
}

Rename specific column(s) in pandas

Use the pandas.DataFrame.rename funtion. Check this link for description.

data.rename(columns = {'gdp': 'log(gdp)'}, inplace = True)

If you intend to rename multiple columns then

data.rename(columns = {'gdp': 'log(gdp)', 'cap': 'log(cap)', ..}, inplace = True)

Disable click outside of bootstrap modal area to close modal

You can Disallow closing of #signUp (This should be the id of the modal) modal when clicking outside of modal.
As well as on ESC button.
jQuery('#signUp').on('shown.bs.modal', function() {
    jQuery(this).data('bs.modal').options.backdrop = 'static';// For outside click of modal.
    jQuery(this).data('bs.modal').options.keyboard = false;// For ESC button.
})

Linux command line howto accept pairing for bluetooth device without pin

~ $ hciconfig noauth

This should do the trick (I'm using bluez 5.23 and there's no more simple-egent and blue-utils). However, I'm trying to look for a way to make changes hciconfig permanent because after power out and then power on, authentication is needed again. So far, the changes in hciconfig still stays the same when you reboot it. it reverts back only when power out. If anybody has found a way to make hciconfig permanent, do let me know!

How to check is Apache2 is stopped in Ubuntu?

In the command line type service apache2 status then hit enter. The result should say:

Apache2 is running (pid xxxx)

Converting ArrayList to HashMap

Using a supposed name property as the map key:

for (Product p: productList) { s.put(p.getName(), p); }

How to configure robots.txt to allow everything?

I understand that this is fairly old question and has some pretty good answers. But, here is my two cents for the sake of completeness.

As per the official documentation, there are four ways, you can allow complete access for robots to access your site.

Clean:

Specify a global matcher with a disallow segment as mentioned by @unor. So your /robots.txt looks like this.

User-agent: *
Disallow:

The hack:

Create a /robots.txt file with no content in it. Which will default to allow all for all type of Bots.

I don't care way:

Do not create a /robots.txt altogether. Which should yield the exact same results as the above two.

The ugly:

From the robots documentation for meta tags, You can use the following meta tag on all your pages on your site to let the Bots know that these pages are not supposed to be indexed.

<META NAME="ROBOTS" CONTENT="NOINDEX">

In order for this to be applied to your entire site, You will have to add this meta tag for all of your pages. And this tag should strictly be placed under your HEAD tag of the page. More about this meta tag here.

CSV new-line character seen in unquoted field error

I know this has been answered for quite some time but not solve my problem. I am using DictReader and StringIO for my csv reading due to some other complications. I was able to solve problem more simply by replacing delimiters explicitly:

with urllib.request.urlopen(q) as response:
    raw_data = response.read()
    encoding = response.info().get_content_charset('utf8') 
    data = raw_data.decode(encoding)
    if '\r\n' not in data:
        # proably a windows delimited thing...try to update it
        data = data.replace('\r', '\r\n')

Might not be reasonable for enormous CSV files, but worked well for my use case.

Convert a String to int?

With a recent nightly, you can do this:

let my_int = from_str::<int>(&*my_string);

What's happening here is that String can now be dereferenced into a str. However, the function wants an &str, so we have to borrow again. For reference, I believe this particular pattern (&*) is called "cross-borrowing".

Copy/Paste from Excel to a web page

For any future googlers ending up here like me, I used @tatu Ulmanen's concept and just turned it into an array of objects. This simple function takes a string of pasted excel (or Google sheet) data (preferably from a textarea) and turns it into an array of objects. It uses the first row for column/property names.

function excelToObjects(stringData){
    var objects = [];
    //split into rows
    var rows = stringData.split('\n');

    //Make columns
    columns = rows[0].split('\t');

    //Note how we start at rowNr = 1, because 0 is the column row
    for (var rowNr = 1; rowNr < rows.length; rowNr++) {
        var o = {};
        var data = rows[rowNr].split('\t');

        //Loop through all the data
        for (var cellNr = 0; cellNr < data.length; cellNr++) {
            o[columns[cellNr]] = data[cellNr];
        }

        objects.push(o);
    }

    return objects;
}

Hopefully it helps someone in the future.

Fastest way to check if a value exists in a list

Because the question is not always supposed to be understood as the fastest technical way - I always suggest the most straightforward fastest way to understand/write: a list comprehension, one-liner

[i for i in list_from_which_to_search if i in list_to_search_in]

I had a list_to_search_in with all the items, and wanted to return the indexes of the items in the list_from_which_to_search.

This returns the indexes in a nice list.

There are other ways to check this problem - however list comprehensions are quick enough, adding to the fact of writing it quick enough, to solve a problem.

How to get error message when ifstream open fails

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

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

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

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

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

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

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

@angular/material/index.d.ts' is not a module

@angular/material has changed its folder structure. Now you need to use all the modules from their respective folders instead of just material folder

For example:

import { MatDialogModule } from "@angular/material";

has now changed to

import { MatDialogModule } from "@angular/material/dialog";

You can check the following to find the correct path for your module

https://material.angular.io/components/categories

Just navigate to the API tab of required module and find the correct path like this 1

Create hyperlink to another sheet

Something like the following will loop through column A in the Control sheet and turn the values in the cells into Hyperlinks. Not something I've had to do before so please excuse bugs:

Sub CreateHyperlinks()

Dim mySheet As String
Dim myRange As Excel.Range
Dim cell As Excel.Range
Set myRange = Excel.ThisWorkbook.Sheets("Control").Range("A1:A5") '<<adjust range to suit

For Each cell In myRange
    Excel.ThisWorkbook.Sheets("Control").Hyperlinks.Add Anchor:=cell, Address:="", SubAddress:=cell.Value & "!A1" '<<from recorded macro
Next cell

End Sub

You have not accepted the license agreements of the following SDK components

I ran across this error when i ran cordova build android

I solved this issue by firing ./sdkmanager --licenses and accepting all the licenses.

  1. You have a sdkmanager.bat under the android sdk folder in the path: android/sdk/tools/bin
  2. To trigger that open a command prompt in android/sdk/tools/bin
  3. type ./sdkmanager --licenses and enter
  4. Press y to review all licenses and then press y to accept all licenses

How to create a hex dump of file containing only the hex characters without spaces in bash?

I think this is the most widely supported version (requiring only POSIX defined tr and od behavior):

cat "$file" | od -v -t x1 -A n | tr -d ' \n'

This uses od to print each byte as hex without address without skipping repeated bytes and tr to delete all spaces and linefeeds in the output. Note that not even the trailing linefeed is emitted here. (The cat is intentional to allow multicore processing where cat can wait for filesystem while od is still processing previously read part. Single core users may want replace that with < "$file" od ... to save starting one additional process.)

Package structure for a Java project?

One another way is to separate out the APIs, services, and entities into different packages.

enter image description here

Using event.target with React components

First argument in update method is SyntheticEvent object that contains common properties and methods to any event, it is not reference to React component where there is property props.

if you need pass argument to update method you can do it like this

onClick={ (e) => this.props.onClick(e, 'home', 'Home') }

and get these arguments inside update method

update(e, space, txt){
   console.log(e.target, space, txt);
}

Example


event.target gives you the native DOMNode, then you need to use the regular DOM APIs to access attributes. For instance getAttribute or dataset

<button 
  data-space="home" 
  className="home" 
  data-txt="Home" 
  onClick={ this.props.onClick } 
/> 
  Button
</button>

onClick(e) {
   console.log(e.target.dataset.txt, e.target.dataset.space);
}

Example

CSS full screen div with text in the middle

The standard approach is to give the centered element fixed dimensions, and place it absolutely:

<div class='fullscreenDiv'>
    <div class="center">Hello World</div>
</div>?

.center {
    position: absolute;
    width: 100px;
    height: 50px;
    top: 50%;
    left: 50%;
    margin-left: -50px; /* margin is -0.5 * dimension */
    margin-top: -25px; 
}?

Comparing two arrays & get the values which are not common

PS > $c = Compare-Object -ReferenceObject (1..5) -DifferenceObject (1..6) -PassThru
PS > $c
6

Using Ansible set_fact to create a dictionary from register results

Thank you Phil for your solution; in case someone ever gets in the same situation as me, here is a (more complex) variant:

---
# this is just to avoid a call to |default on each iteration
- set_fact:
    postconf_d: {}

- name: 'get postfix default configuration'
  command: 'postconf -d'
  register: command

# the answer of the command give a list of lines such as:
# "key = value" or "key =" when the value is null
- name: 'set postfix default configuration as fact'
  set_fact:
    postconf_d: >
      {{
        postconf_d |
        combine(
          dict([ item.partition('=')[::2]|map('trim') ])
        )
  with_items: command.stdout_lines

This will give the following output (stripped for the example):

"postconf_d": {
    "alias_database": "hash:/etc/aliases", 
    "alias_maps": "hash:/etc/aliases, nis:mail.aliases",
    "allow_min_user": "no", 
    "allow_percent_hack": "yes"
}

Going even further, parse the lists in the 'value':

- name: 'set postfix default configuration as fact'
  set_fact:
    postconf_d: >-
      {% set key, val = item.partition('=')[::2]|map('trim') -%}
      {% if ',' in val -%}
        {% set val = val.split(',')|map('trim')|list -%}
      {% endif -%}
      {{ postfix_default_main_cf | combine({key: val}) }}
  with_items: command.stdout_lines
...
"postconf_d": {
    "alias_database": "hash:/etc/aliases", 
    "alias_maps": [
        "hash:/etc/aliases", 
        "nis:mail.aliases"
    ], 
    "allow_min_user": "no", 
    "allow_percent_hack": "yes"
}

A few things to notice:

  • in this case it's needed to "trim" everything (using the >- in YAML and -%} in Jinja), otherwise you'll get an error like:

    FAILED! => {"failed": true, "msg": "|combine expects dictionaries, got u\"  {u'...
    
  • obviously the {% if .. is far from bullet-proof

  • in the postfix case, val.split(',')|map('trim')|list could have been simplified to val.split(', '), but I wanted to point out the fact you will need to |list otherwise you'll get an error like:

    "|combine expects dictionaries, got u\"{u'...': <generator object do_map at ...
    

Hope this can help.

Add column to SQL query results

Manually add it when you build the query:

SELECT 'Site1' AS SiteName, t1.column, t1.column2
FROM t1

UNION ALL
SELECT 'Site2' AS SiteName, t2.column, t2.column2
FROM t2

UNION ALL
...

EXAMPLE:

DECLARE @t1 TABLE (column1 int, column2 nvarchar(1))
DECLARE @t2 TABLE (column1 int, column2 nvarchar(1))

INSERT INTO @t1
SELECT 1, 'a'
UNION SELECT 2, 'b'

INSERT INTO @t2
SELECT 3, 'c'
UNION SELECT 4, 'd'


SELECT 'Site1' AS SiteName, t1.column1, t1.column2
FROM @t1 t1

UNION ALL
SELECT 'Site2' AS SiteName, t2.column1, t2.column2
FROM @t2 t2

RESULT:

SiteName  column1  column2
Site1       1      a
Site1       2      b
Site2       3      c
Site2       4      d

call javascript function on hyperlink click

I would generally recommend using element.attachEvent (IE) or element.addEventListener (other browsers) over setting the onclick event directly as the latter will replace any existing event handlers for that element.

attachEvent / addEventListening allow multiple event handlers to be created.

SQL Server equivalent to MySQL enum data type?

IMHO Lookup tables is the way to go, with referential integrity. But only if you avoid "Evil Magic Numbers" by following an example such as this one: Generate enum from a database lookup table using T4

Have Fun!

how to get the last part of a string before a certain character?

You are looking for str.rsplit(), with a limit:

print x.rsplit('-', 1)[0]

.rsplit() searches for the splitting string from the end of input string, and the second argument limits how many times it'll split to just once.

Another option is to use str.rpartition(), which will only ever split just once:

print x.rpartition('-')[0]

For splitting just once, str.rpartition() is the faster method as well; if you need to split more than once you can only use str.rsplit().

Demo:

>>> x = 'http://test.com/lalala-134'
>>> print x.rsplit('-', 1)[0]
http://test.com/lalala
>>> 'something-with-a-lot-of-dashes'.rsplit('-', 1)[0]
'something-with-a-lot-of'

and the same with str.rpartition()

>>> print x.rpartition('-')[0]
http://test.com/lalala
>>> 'something-with-a-lot-of-dashes'.rpartition('-')[0]
'something-with-a-lot-of'

Clone contents of a GitHub repository (without the folder itself)

Unfortunately, this doesn't work if there are other, non-related directories already in the same dir. Looking for a solution. The error message is: "fatal: destination path '.' already exists...".

The solution in this case is:

git init
git remote add origin [email protected]:me/name.git
git pull origin master

This recipe works even if there are other directories in the one you want to checkout in.

Checking for NULL pointer in C/C++

The C Programming Language (K&R) would have you check for null == ptr to avoid an accidental assignment.

ERROR Error: StaticInjectorError(AppModule)[UserformService -> HttpClient]:

Make sure you have imported HttpClientModule instead of adding HttpClient direcly to the list of providers.

See https://angular.io/guide/http#setup for more info.

The HttpClientModule actually provides HttpClient for you. See https://angular.io/api/common/http/HttpClientModule:

Code sample:

import { HttpClientModule, /* other http imports */ } from "@angular/common/http";

@NgModule({
    // ...other declarations, providers, entryComponents, etc.
    imports: [
        HttpClientModule,
        // ...some other imports
    ],
})
export class AppModule { }

Failed to resolve: com.android.support:appcompat-v7:26.0.0

1 - in build.gradle change my supportLibVersion to 26.0.0

2 - in app/build.gradle use :

implementation "com.android.support:appcompat v7:${rootProject.ext.supportLibVersion}"

3 - cd android

4 - ./gradlew clean

5 - ./gradlew assembleRelease

How to read a file in Groovy into a string?

the easiest way would be

new File(filename).getText()

which means you could just do:

new File(filename).text

See full command of running/stopped container in Docker

Use runlike from git repository https://github.com/lavie/runlike

To install runlike

pip install runlike

As it accept container id as an argument so to extract container id use following command

docker ps -a -q

You are good to use runlike to extract complete docker run command with following command

runlike <docker container ID>

Is null reference possible?

Yes:

#include <iostream>
#include <functional>

struct null_ref_t {
   template <typename T>
   operator T&() {
      union TypeSafetyBreaker {
         T *ptr;

         // see https://stackoverflow.com/questions/38691282/use-of-union-with-reference
         std::reference_wrapper<T> ref; 
      };

      TypeSafetyBreaker ptr = {.ptr = nullptr};

      // unwrap the reference
      return ptr.ref.get();
   }
};

null_ref_t nullref;


int main() {
   int &a = nullref;

   // Segmentation fault
   a = 4;
   return 0;
}

Delete/Reset all entries in Core Data?

Assuming you are using MagicalRecord and have a default persistence store:

I don't like all the solutions that assume certain files to exist and/or demand entering the entities names or classes. This is a Swift(2), safe way to delete all the data from all the entities. After deleting it will recreate a fresh stack too (I am actually not sure as to how neccessery this part is).

It's godo for "logout" style situations when you want to delete everything but have a working store and moc to get new data in (once the user logs in...)

extension NSManagedObject {

    class func dropAllData() {

        MagicalRecord.saveWithBlock({ context in

            for name in NSManagedObjectModel.MR_defaultManagedObjectModel().entitiesByName.keys {
                do { try self.deleteAll(name, context: context) }
                catch { print("?? ?? Error when deleting \(name): \(error)") }
            }

            }) { done, err in
                MagicalRecord.cleanUp()
                MagicalRecord.setupCoreDataStackWithStoreNamed("myStoreName")
        }
    }

    private class func deleteAll(name: String, context ctx: NSManagedObjectContext) throws {
        let all = NSFetchRequest(entityName: name)
        all.includesPropertyValues = false

        let allObjs = try ctx.executeFetchRequest(all)
        for obj in allObjs {
            obj.MR_deleteEntityInContext(ctx)
        }

    }
}

How to convert a Collection to List?

What you request is quite a costy operation, make sure you don't need to do it often (e.g in a cycle).

If you need it to stay sorted and you update it frequently, you can create a custom collection. For example, I came up with one that has your TreeBidiMap and TreeMultiset under the hood. Implement only what you need and care about data integrity.

class MyCustomCollection implements Map<K, V> {
    TreeBidiMap<K, V> map;
    TreeMultiset<V> multiset;
    public V put(K key, V value) {
        removeValue(map.put(key, value));
        multiset.add(value);
    }
    public boolean remove(K key) {
        removeValue(map.remove(key));
    }
    /** removes value that was removed/replaced in map */
    private removeValue(V value) {
        if (value != null) {
            multiset.remove(value);
        }
    }
    public Set<K> keySet() {
        return Collections.unmodifiableSet(map.keySet());
    }
    public Collection<V> values() {
        return Collections.unmodifiableCollection(multiset);
    }
    // many more methods to be implemented, e.g. count, isEmpty etc.
    // but these are fairly simple
}

This way, you have a sorted Multiset returned from values(). However, if you need it to be a list (e.g. you need the array-like get(index) method), you'd need something more complex.

For brevity, I only return unmodifiable collections. What @Lino mentioned is correct, and modifying the keySet or values collection as it is would make it inconsistent. I don't know any consistent way to make the values mutable, but the keySet could support remove if it uses the remove method from the MyCustomCollection class above.

Change column type in pandas

Here is a function that takes as its arguments a DataFrame and a list of columns and coerces all data in the columns to numbers.

# df is the DataFrame, and column_list is a list of columns as strings (e.g ["col1","col2","col3"])
# dependencies: pandas

def coerce_df_columns_to_numeric(df, column_list):
    df[column_list] = df[column_list].apply(pd.to_numeric, errors='coerce')

So, for your example:

import pandas as pd

def coerce_df_columns_to_numeric(df, column_list):
    df[column_list] = df[column_list].apply(pd.to_numeric, errors='coerce')

a = [['a', '1.2', '4.2'], ['b', '70', '0.03'], ['x', '5', '0']]
df = pd.DataFrame(a, columns=['col1','col2','col3'])

coerce_df_columns_to_numeric(df, ['col2','col3'])

How are POST and GET variables handled in Python?

They are stored in the CGI fieldstorage object.

import cgi
form = cgi.FieldStorage()

print "The user entered %s" % form.getvalue("uservalue")

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at

The server at x3.chatforyoursite.com needs to output the following header:

Access-Control-Allow-Origin: http://www.example.com

Where http://www.example.com is your website address. You should check your settings on chatforyoursite.com to see if you can enable this - if not their technical support would probably be the best way to resolve this. However to answer your question, you need the remote site to allow your site to access AJAX responses client side.

How to get current working directory using vba?

If you really mean pure working Directory, this should suit for you.

Solution A:

Dim ParentPath As String: ParentPath = "\"
Dim ThisWorkbookPath As String
Dim ThisWorkbookPathParts, Part As Variant
Dim Count, Parts As Long

ThisWorkbookPath = ThisWorkbook.Path
ThisWorkbookPathParts = Split(ThisWorkbookPath, _
                        Application.PathSeparator)

Parts = UBound(ThisWorkbookPathParts)
Count = 0
For Each Part In ThisWorkbookPathParts
    If Count > 0 Then
        ParentPath = ParentPath & Part & "\"
    End If
    Count = Count + 1
    If Count = Parts Then Exit For
Next

MsgBox "File-Drive = " & ThisWorkbookPathParts _
       (LBound(ThisWorkbookPathParts))
MsgBox "Parent-Path = " & ParentPath

But if don't, this should be enough.

Solution B:

Dim ThisWorkbookPath As String

ThisWorkbookPath = ThisWorkbook.Path
MsgBox "Working-Directory = " & ThisWorkbookPath 

input file appears to be a text format dump. Please use psql

if you use pg_dump with -Fp to backup in plain text format, use following command:

cat db.txt | psql dbname

to copy all data to your database with name dbname

Get size of an Iterable in Java

You can cast your iterable to a list then use .size() on it.

Lists.newArrayList(iterable).size();

For the sake of clarity, the above method will require the following import:

import com.google.common.collect.Lists;

Remove all whitespaces from NSString

This may help you if you are experiencing \u00a0 in stead of (whitespace). I had this problem when I was trying to extract Device Contact Phone Numbers. I needed to modify the phoneNumber string so it has no whitespace in it.

NSString* yourString = [yourString stringByReplacingOccurrencesOfString:@"\u00a0" withString:@""];

When yourString was the current phone number.

Java - get the current class name?

I've found this to work for my code,, however my code is getting the class out of an array within a for loop.

String className="";

className = list[i].getClass().getCanonicalName();

System.out.print(className); //Use this to test it works

How to execute .sql file using powershell?

if(Test-Path "C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS") { #Sql Server 2012
    Import-Module SqlPs -DisableNameChecking
    C: # Switch back from SqlServer
} else { #Sql Server 2008
    Add-PSSnapin SqlServerCmdletSnapin100 # here live Invoke-SqlCmd
}

Invoke-Sqlcmd -InputFile "MySqlScript.sql" -ServerInstance "Database name" -ErrorAction 'Stop' -Verbose -QueryTimeout 1800 # 30min

How to automatically start a service when running a docker container?

docker export -o <nameOfContainer>.tar <nameOfContainer>

Might need to prune the existing container using docker prune ...

Import with required modifications:

cat <nameOfContainer>.tar | docker import -c "ENTRYPOINT service mysql start && /bin/bash" - <nameOfContainer>

Run the container for example with always restart option to make sure it will auto resume after host/daemon recycle:

docker run -d -t -i --restart always --name <nameOfContainer> <nameOfContainer> /bin/bash

Side note: In my opinion reasonable is to start only cron service leaving container as clean as possible then just modify crontab or cron.hourly, .daily etc... with corresponding checkup/monitoring scripts. Reason is You rely only on one daemon and in case of changes it is easier with ansible or puppet to redistribute cron scripts instead of track services that start at boot.

Convert digits into words with JavaScript

I like the result I got here which i think is easy to read and short enough to fit as a solution.

_x000D_
_x000D_
function NumInWords (number) {_x000D_
  const first = ['','one ','two ','three ','four ', 'five ','six ','seven ','eight ','nine ','ten ','eleven ','twelve ','thirteen ','fourteen ','fifteen ','sixteen ','seventeen ','eighteen ','nineteen '];_x000D_
  const tens = ['', '', 'twenty','thirty','forty','fifty', 'sixty','seventy','eighty','ninety'];_x000D_
  const mad = ['', 'thousand', 'million', 'billion', 'trillion'];_x000D_
  let word = '';_x000D_
_x000D_
  for (let i = 0; i < mad.length; i++) {_x000D_
    let tempNumber = number%(100*Math.pow(1000,i));_x000D_
    if (Math.floor(tempNumber/Math.pow(1000,i)) !== 0) {_x000D_
      if (Math.floor(tempNumber/Math.pow(1000,i)) < 20) {_x000D_
        word = first[Math.floor(tempNumber/Math.pow(1000,i))] + mad[i] + ' ' + word;_x000D_
      } else {_x000D_
        word = tens[Math.floor(tempNumber/(10*Math.pow(1000,i)))] + '-' + first[Math.floor(tempNumber/Math.pow(1000,i))%10] + mad[i] + ' ' + word;_x000D_
      }_x000D_
    }_x000D_
_x000D_
    tempNumber = number%(Math.pow(1000,i+1));_x000D_
    if (Math.floor(tempNumber/(100*Math.pow(1000,i))) !== 0) word = first[Math.floor(tempNumber/(100*Math.pow(1000,i)))] + 'hunderd ' + word;_x000D_
  }_x000D_
    return word;_x000D_
}_x000D_
_x000D_
console.log(NumInWords(89754697976431))
_x000D_
_x000D_
_x000D_

And the result is :

eighty-nine trillion seven hundred fifty-four billion six hundred ninety-seven million nine hundred seventy-six thousand four hundred thirty-one

Getting time and date from timestamp with php

$mydatetime = "2012-04-02 02:57:54";
$datetimearray = explode(" ", $mydatetime);
$date = $datetimearray[0];
$time = $datetimearray[1];
$reformatted_date = date('d-m-Y',strtotime($date));
$reformatted_time = date('Gi.s',strtotime($time));

Cannot access wamp server on local network

1.

first of all Port 80(or what ever you are using) and 443 must be allow for both TCP and UDP packets. To do this, create 2 inbound rules for TPC and UDP on Windows Firewall for port 80 and 443. (or you can disable your whole firewall for testing but permanent solution if allow inbound rule)

2.

If you are using WAMPServer 3 See bottom of answer

For WAMPServer versions <= 2.5

You need to change the security setting on Apache to allow access from anywhere else, so edit your httpd.conf file.

Change this section from :

#   onlineoffline tag - don't remove
     Order Deny,Allow
     Deny from all
     Allow from 127.0.0.1
     Allow from ::1
     Allow from localhost

To :

#   onlineoffline tag - don't remove
    Order Allow,Deny
      Allow from all

if "Allow from all" line not work for your then use "Require all granted" then it will work for you.

WAMPServer 3 has a different method

In version 3 and > of WAMPServer there is a Virtual Hosts pre defined for localhost so dont amend the httpd.conf file at all, leave it as you found it.

Using the menus, edit the httpd-vhosts.conf file.

enter image description here

It should look like this :

<VirtualHost *:80>
    ServerName localhost
    DocumentRoot D:/wamp/www
    <Directory  "D:/wamp/www/">
        Options +Indexes +FollowSymLinks +MultiViews
        AllowOverride All
        Require local
    </Directory>
</VirtualHost>

Amend it to

<VirtualHost *:80>
    ServerName localhost
    DocumentRoot D:/wamp/www
    <Directory  "D:/wamp/www/">
        Options +Indexes +FollowSymLinks +MultiViews
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost>

Note:if you are running wamp for other than port 80 then VirtualHost will be like VirtualHost *:86.(86 or port whatever you are using) instead of VirtualHost *:80

3. Dont forget to restart All Services of Wamp or Apache after making this change

LINQ Aggregate algorithm explained

A short and essential definition might be this: Linq Aggregate extension method allows to declare a sort of recursive function applied on the elements of a list, the operands of whom are two: the elements in the order in which they are present into the list, one element at a time, and the result of the previous recursive iteration or nothing if not yet recursion.

In this way you can compute the factorial of numbers, or concatenate strings.

How do I execute a Shell built-in command with a C function?

You can use the excecl command

int execl(const char *path, const char *arg, ...);

Like shown here

#include <stdio.h>
#include <unistd.h>
#include <dirent.h>

int main (void) {

   return execl ("/bin/pwd", "pwd", NULL);

}

The second argument will be the name of the process as it will appear in the process table.

Alternatively, you can use the getcwd() function to get the current working directory:

#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#define MAX 255

int main (void) {
char wd[MAX];
wd[MAX-1] = '\0';

if(getcwd(wd, MAX-1) == NULL) {
  printf ("Can not get current working directory\n");
}
else {
  printf("%s\n", wd);
}
  return 0;
}

How do I install Python packages in Google's Colab?

You can use !setup.py install to do that.

Colab is just like a Jupyter notebook. Therefore, we can use the ! operator here to install any package in Colab. What ! actually does is, it tells the notebook cell that this line is not a Python code, its a command line script. So, to run any command line script in Colab, just add a ! preceding the line.

For example: !pip install tensorflow. This will treat that line (here pip install tensorflow) as a command prompt line and not some Python code. However, if you do this without adding the ! preceding the line, it'll throw up an error saying "invalid syntax".

But keep in mind that you'll have to upload the setup.py file to your drive before doing this (preferably into the same folder where your notebook is).

Hope this answers your question :)

How to loop backwards in python?

All of these three solutions give the same results if the input is a string:

1.

def reverse(text):
    result = ""
    for i in range(len(text),0,-1):
        result += text[i-1]
    return (result)

2.

text[::-1]

3.

"".join(reversed(text))

Order Bars in ggplot2 bar graph

Since we are only looking at the distribution of a single variable ("Position") as opposed to looking at the relationship between two variables, then perhaps a histogram would be the more appropriate graph. ggplot has geom_histogram() that makes it easy:

ggplot(theTable, aes(x = Position)) + geom_histogram(stat="count")

enter image description here

Using geom_histogram():

I think geom_histogram() is a little quirky as it treats continuous and discrete data differently.

For continuous data, you can just use geom_histogram() with no parameters. For example, if we add in a numeric vector "Score"...

    Name   Position   Score  
1   James  Goalkeeper 10
2   Frank  Goalkeeper 20
3   Jean   Defense    10
4   Steve  Defense    10
5   John   Defense    20
6   Tim    Striker    50

and use geom_histogram() on the "Score" variable...

ggplot(theTable, aes(x = Score)) + geom_histogram()

enter image description here

For discrete data like "Position" we have to specify a calculated statistic computed by the aesthetic to give the y value for the height of the bars using stat = "count":

 ggplot(theTable, aes(x = Position)) + geom_histogram(stat = "count")

Note: Curiously and confusingly you can also use stat = "count" for continuous data as well and I think it provides a more aesthetically pleasing graph.

ggplot(theTable, aes(x = Score)) + geom_histogram(stat = "count")

enter image description here

Edits: Extended answer in response to DebanjanB's helpful suggestions.

Java optional parameters

Overloading is fine, but if there's a lot of variables that needs default value, you will end up with :

public void methodA(A arg1) {  }
public void methodA( B arg2,) {  }
public void methodA(C arg3) {  }
public void methodA(A arg1, B arg2) {  }
public void methodA(A arg1, C arg3) {  }
public void methodA( B arg2, C arg3) {  }
public void methodA(A arg1, B arg2, C arg3) {  }

So I would suggest use the Variable Argument provided by Java. Here's a link for explanation.

Moment.js - how do I get the number of years since a date, not rounded up?

If you dont want to use any module for age calculation

var age = Math.floor((new Date() - new Date(date_of_birth)) / 1000 / 60 / 60 / 24 / 365.25)

How to hide/show more text within a certain length (like youtube)

You can use like this

$(".jsgrid-cell").each(function(i,v){
    var txt=$(v).text();
    if(txt.length>100){
        var shortText=txt.substring(0, 100)+
        "<span onclick='$(this).hide();$(this).next().toggle();'>"+
            "..."+
        "</span>"+
        "<span  style='display:none'>"+
            txt.substring(100, txt.length)+
        "</span>";

        $(v).html(shortText );
    }
});

SQL select join: is it possible to prefix all columns as 'prefix.*'?

Or you could use Red Gate SQL Refactor or SQL Prompt, which expands your SELECT * into column lists with a click of the Tab button

so in your case, if you type in SELECT * FROM A JOIN B ... Go to the end of *, Tab button, voila! you'll see SELECT A.column1, A.column2, .... , B.column1, B.column2 FROM A JOIN B

It's not free though

What does %>% mean in R

matrix multiplication, see the following example:

> A <- matrix (c(1,3,4, 5,8,9, 1,3,3), 3,3)
> A
     [,1] [,2] [,3]
[1,]    1    5    1
[2,]    3    8    3
[3,]    4    9    3
> 
> B <- matrix (c(2,4,5, 8,9,2, 3,4,5), 3,3)
> 
> B
     [,1] [,2] [,3]
[1,]    2    8    3
[2,]    4    9    4
[3,]    5    2    5
> 
> 
> A %*% B
     [,1] [,2] [,3]
[1,]   27   55   28
[2,]   53  102   56
[3,]   59  119   63

> B %*% A
     [,1] [,2] [,3]
[1,]   38  101   35
[2,]   47  128   43
[3,]   31   86   26

Also see:

http://en.wikipedia.org/wiki/Matrix_multiplication

If this does not follow the size of matrix rule you will get the error:

> A <- matrix(c(1,2,3,4,5,6), 3,2)
    > A
     [,1] [,2]
[1,]    1    4
[2,]    2    5
[3,]    3    6

> B <- matrix (c(3,1,3,4,4,4,4,4,3), 3,3)

> B
         [,1] [,2] [,3]
    [1,]    3    4    4
    [2,]    1    4    4
    [3,]    3    4    3
    > A%*%B
    Error in A %*% B : non-conformable arguments

How to style a checkbox using CSS

Simple to implement and easily customizable solution

After a lot of search and testing I got this solution which is simple to implement and easier to customize. In this solution:

  1. You don't need external libraries and files
  2. You don't need to add extra HTML in your page
  3. You don't need to change checkbox names and id

Simple put the flowing CSS at the top of your page and all checkboxes style will change like this:

Enter image description here

_x000D_
_x000D_
input[type=checkbox] {
  transform: scale(1.5);
}

input[type=checkbox] {
  width: 30px;
  height: 30px;
  margin-right: 8px;
  cursor: pointer;
  font-size: 17px;
  visibility: hidden;
}

input[type=checkbox]:after {
  content: " ";
  background-color: #fff;
  display: inline-block;
  margin-left: 10px;
  padding-bottom: 5px;
  color: #00BFF0;
  width: 22px;
  height: 25px;
  visibility: visible;
  border: 1px solid #00BFF0;
  padding-left: 3px;
  border-radius: 5px;
}

input[type=checkbox]:checked:after {
  content: "\2714";
  padding: -5px;
  font-weight: bold;
}
_x000D_
<input type="checkbox" id="checkbox1" />
<label for="checkbox1">Checkbox</label>
_x000D_
_x000D_
_x000D_

when I run mockito test occurs WrongTypeOfReturnValue Exception

Another reason for similar error message is trying to mock a final method. One shouldn't attempt to mock final methods (see Final method mocking).

I have also confronted the error in a multi-threaded test. Answer by gna worked in that case.

how can I enable PHP Extension intl?

I have seen the screen shoot, the issue you are having is missing msvcp110.dll , this file you can download from

https://www.dll-files.com/msvcp110.dll.html

and upload to C:/Windows folder

than after edit php.ini from XAMPP

Change

;extension=php_intl.dll

to

extension=php_intl.dll

Save the file and restart Apache from XAMPP

Is there an easy way to convert Android Application to IPad, IPhone

In the box is working on being able to convert android projects to iOS

https://code.google.com/p/in-the-box/

How to Load an Assembly to AppDomain with all references recursively?

It took me a while to understand @user1996230's answer so I decided to provide a more explicit example. In the below example I make a proxy for an object loaded in another AppDomain and call a method on that object from another domain.

class ProxyObject : MarshalByRefObject
{
    private Type _type;
    private Object _object;

    public void InstantiateObject(string AssemblyPath, string typeName, object[] args)
    {
        assembly = Assembly.LoadFrom(AppDomain.CurrentDomain.BaseDirectory + AssemblyPath); //LoadFrom loads dependent DLLs (assuming they are in the app domain's base directory
        _type = assembly.GetType(typeName);
        _object = Activator.CreateInstance(_type, args); ;
    }

    public void InvokeMethod(string methodName, object[] args)
    {
        var methodinfo = _type.GetMethod(methodName);
        methodinfo.Invoke(_object, args);
    }
}

static void Main(string[] args)
{
    AppDomainSetup setup = new AppDomainSetup();
    setup.ApplicationBase = @"SomePathWithDLLs";
    AppDomain domain = AppDomain.CreateDomain("MyDomain", null, setup);
    ProxyObject proxyObject = (ProxyObject)domain.CreateInstanceFromAndUnwrap(typeof(ProxyObject).Assembly.Location,"ProxyObject");
    proxyObject.InstantiateObject("SomeDLL","SomeType", new object[] { "someArgs});
    proxyObject.InvokeMethod("foo",new object[] { "bar"});
}

Getting one value from a tuple

General

Single elements of a tuple a can be accessed -in an indexed array-like fashion-

via a[0], a[1], ... depending on the number of elements in the tuple.

Example

If your tuple is a=(3,"a")

  • a[0] yields 3,
  • a[1] yields "a"

Concrete answer to question

def tup():
  return (3, "hello")

tup() returns a 2-tuple.

In order to "solve"

i = 5 + tup()  # I want to add just the three

you select the 3 by

tup()[0|    #first element

so in total

i = 5 + tup()[0]

Alternatives

Go with namedtuple that allows you to access tuple elements by name (and by index). Details at https://docs.python.org/3/library/collections.html#collections.namedtuple

>>> import collections
>>> MyTuple=collections.namedtuple("MyTuple", "mynumber, mystring")
>>> m = MyTuple(3, "hello")
>>> m[0]
3
>>> m.mynumber
3
>>> m[1]
'hello'
>>> m.mystring
'hello'

How to update Ruby to 1.9.x on Mac?

I'll disagree with The Tin Man here. I regard rbenv as preferable to RVM. rbenv doesn't interfere drastically with your shell the way RVM does, and it lets you add separate Ruby installations in ordinary folders that you can examine directly. It allows you to compile Ruby yourself. Good outline of the differences here: https://github.com/sstephenson/rbenv/wiki/Why-rbenv%3F

I provide instructions for compiling Ruby 1.9 for rbenv here. Further, more detailed information here. I have used this technique with easy success on Snow Leopard, Lion, and Mountain Lion.

How do you remove Subversion control for a folder?

It worked well for me:

find directory_to_delete/ -type d -name '*.svn' | xargs rm -rf

Switching to landscape mode in Android Emulator

Just use 9 in numeric keyboard with num-lock off.

Image showing the numpad with 9 highlighted

7 rotates in the opposite direction.

Get height and width of a layout programmatically

you can use coroutines as well, like this one :

CoroutineScope(Dispatchers.Main).launch {
        delay(10)
        val width = view.width()
        val height= view.height()
        // do your job ....
    }

Simulate delayed and dropped packets on Linux

iptables(8) has a statistic match module that can be used to match every nth packet. To drop this packet, just append -j DROP.

Override console.log(); for production

After read a lot of posts, I made my own solution as follow:

SCRIPT:

function extendConsole() {
    "use strict";
    try {
        var disabledConsoles = {};

        console.enable = function (level, enabled) {
            // Prevent errors in browsers without console[level]
            if (window.console === 'undefined' || !window.console || window.console === null) {
                window.console = {};
            }
            if (window.console[level] === 'undefined' || !window.console[level] || window.console[level] == null) {
                window.console[level] = function() {};
            }

            if (enabled) {
                if (disabledConsoles[level]) {
                    window.console[level] = disabledConsoles[level];
                }
                console.info("console." + level + "() was enabled.");
            } else {
                disabledConsoles[level] = window.console[level];
                window.console[level] = function () { };
                console.info("console." + level + "() was disabled.");
            }
        };
    } catch (exception) {
        console.error("extendConsole() threw an exception.");
        console.debug(exception);
    }
}

USAGE:

extendConsole();
console.enable("debug", window.debugMode);

EXAMPLE:

http://jsfiddle.net/rodolphobrock/2rzxb5bo/10/

Angular2 RC5: Can't bind to 'Property X' since it isn't a known property of 'Child Component'

There are multiple possible causes for this error:

1) When you put the property 'x' inside brackets you are trying to bind to it. Therefore first thing to check is if the property 'x' is defined in your component with an Input() decorator

Your html file:

<body [x]="...">

Your class file:

export class YourComponentClass {

  @Input()
  x: string;
  ...
}

(make sure you also have the parentheses)

2) Make sure you registered your component/directive/pipe classes in NgModule:

@NgModule({
  ...
  declarations: [
    ...,
    YourComponentClass
  ],
  ...
})

See https://angular.io/guide/ngmodule#declare-directives for more details about declare directives.

3) Also happens if you have a typo in your angular directive. For example:

<div *ngif="...">
     ^^^^^

Instead of:

<div *ngIf="...">

This happens because under the hood angular converts the asterisk syntax to:

<div [ngIf]="...">

What are the differences between Mustache.js and Handlebars.js?

One more subtle difference is the treatment of falsy values in {{#property}}...{{/property}} blocks. Most mustache implementations will just obey JS falsiness here, not rendering the block if property is '' or '0'.

Handlebars will render the block for '' and 0, but not other falsy values. This can cause some trouble when migrating templates.

VC++ fatal error LNK1168: cannot open filename.exe for writing

Start your program as an administrator. The program can't rewrite your files cause your files are in a protected location on your hard drive.

How to select the Date Picker In Selenium WebDriver

From Java 8 you can use this simple method for picking a random date from the date picker

List<WebElement> datePickerDays = driver.findElements(By.tagName("td"));
datePickerDays.stream().filter(e->e.getText().equals(whichDateYouWantToClick)).findFirst().get().click();

Differences between ConstraintLayout and RelativeLayout

A big difference is that ConstraintLayout respects constraints even if the view is gone. So it won't break the layout if you have a chain and you want to make a view disappear in the middle.

How do you compare two version Strings in Java?

This code try to resolve this type of comparison versions.

Most of the version specifiers, like >= 1.0, are self-explanatory. The specifier ~> has a special meaning, best shown by example. ~> 2.0.3 is identical to >= 2.0.3 and < 2.1. ~> 2.1 is identical to >= 2.1 and < 3.0.

public static boolean apply(String cmpDeviceVersion, String reqDeviceVersion)
{
    Boolean equal           = !cmpDeviceVersion.contains(">") && !cmpDeviceVersion.contains(">=") &&
                              !cmpDeviceVersion.contains("<") && !cmpDeviceVersion.contains("<=") &&
                              !cmpDeviceVersion.contains("~>");

    Boolean between         = cmpDeviceVersion.contains("~>");
    Boolean higher          = cmpDeviceVersion.contains(">") && !cmpDeviceVersion.contains(">=") && !cmpDeviceVersion.contains("~>");
    Boolean higherOrEqual   = cmpDeviceVersion.contains(">=");

    Boolean less            = cmpDeviceVersion.contains("<") && !cmpDeviceVersion.contains("<=");
    Boolean lessOrEqual     = cmpDeviceVersion.contains("<=");

    cmpDeviceVersion        = cmpDeviceVersion.replaceAll("[<>=~]", "");
    cmpDeviceVersion        = cmpDeviceVersion.trim();

    String[] version        = cmpDeviceVersion.split("\\.");
    String[] reqVersion     = reqDeviceVersion.split("\\.");

    if(equal)
    {
        return isEqual(version, reqVersion);
    }
    else if(between)
    {
        return isBetween(version, reqVersion);
    }
    else if(higher)
    {
        return isHigher(version, reqVersion);
    }
    else if(higherOrEqual)
    {
        return isEqual(version, reqVersion) || isHigher(version, reqVersion);
    }
    else if(less)
    {
        return isLess(version, reqVersion);
    }
    else if(lessOrEqual)
    {
        return isEqual(version, reqVersion) || isLess(version, reqVersion);
    }

    return false;
}

private static boolean isEqual(String[] version, String[] reqVersion)
{
    String strVersion = StringUtils.join(version);
    String strReqVersion = StringUtils.join(reqVersion);
    if(version.length > reqVersion.length)
    {
        Integer diff = version.length - reqVersion.length;
        strReqVersion += StringUtils.repeat(".0", diff);
    }
    else if(reqVersion.length > version.length)
    {
        Integer diff = reqVersion.length - version.length;
        strVersion += StringUtils.repeat(".0", diff);
    }

    return strVersion.equals(strReqVersion);
}

private static boolean isHigher(String[] version, String[] reqVersion)
{
    String strVersion = StringUtils.join(version);
    String strReqVersion = StringUtils.join(reqVersion);
    if(version.length > reqVersion.length)
    {
        Integer diff = version.length - reqVersion.length;
        strReqVersion += StringUtils.repeat(".0", diff);
    }
    else if(reqVersion.length > version.length)
    {
        Integer diff = reqVersion.length - version.length;
        strVersion += StringUtils.repeat(".0", diff);
    }

    return strReqVersion.compareTo(strVersion) > 0;
}

private static boolean isLess(String[] version, String[] reqVersion)
{
    String strVersion = StringUtils.join(version);
    String strReqVersion = StringUtils.join(reqVersion);
    if(version.length > reqVersion.length)
    {
        Integer diff = version.length - reqVersion.length;
        strReqVersion += StringUtils.repeat(".0", diff);
    }
    else if(reqVersion.length > version.length)
    {
        Integer diff = reqVersion.length - version.length;
        strVersion += StringUtils.repeat(".0", diff);
    }

    return strReqVersion.compareTo(strVersion) < 0;
}

private static boolean isBetween(String[] version, String[] reqVersion)
{
    return (isEqual(version, reqVersion) || isHigher(version, reqVersion)) &&
            isLess(getNextVersion(version), reqVersion);
}

private static String[] getNextVersion(String[] version)
{
    String[] nextVersion = new String[version.length];
    for(int i = version.length - 1; i >= 0 ; i--)
    {
        if(i == version.length - 1)
        {
            nextVersion[i] = "0";
        }
        else if((i == version.length - 2) && NumberUtils.isNumber(version[i]))
        {
            nextVersion[i] = String.valueOf(NumberUtils.toInt(version[i]) + 1);
        }
        else
        {
            nextVersion[i] = version[i];
        }
    }
    return nextVersion;
}

Basic Apache commands for a local Windows machine

For frequent uses of this command I found it easy to add the location of C:\xampp\apache\bin to the PATH. Use whatever directory you have this installed in.

Then you can run from any directory in command line:

httpd -k restart

The answer above that suggests httpd -k -restart is actually a typo. You can see the commands by running httpd /?

Delete with "Join" in Oracle sql Query

Use a subquery in the where clause. For a delete query requirig a join, this example will delete rows that are unmatched in the joined table "docx_document" and that have a create date > 120 days in the "docs_documents" table.

delete from docs_documents d
where d.id in (
    select a.id from docs_documents a
    left join docx_document b on b.id = a.document_id
    where b.id is null
        and floor(sysdate - a.create_date) > 120
 );

Inserting multiple rows in mysql

// db table name / blog_post / menu /  site_title
// Insert into Table (column names separated with comma)
$sql = "INSERT INTO product_cate (site_title, sub_title) 
  VALUES ('$site_title', '$sub_title')";

// db table name / blog_post / menu /  site_title
// Insert into Table (column names separated with comma)
$sql = "INSERT INTO menu (menu_title, sub_menu)
  VALUES ('$menu_title', '$sub_menu', )";

// db table name / blog_post /  menu /  site_title
// Insert into Table (column names separated with comma)
$sql = "INSERT INTO blog_post (post_title, post_des, post_img)
  VALUES ('$post_title ', '$post_des', '$post_img')";

How to rotate a 3D object on axis three.js?

Here are the two functions I use. They are based on matrix rotations. and can rotate around arbitrary axes. To rotate using the world's axes you would want to use the second function rotateAroundWorldAxis().

// Rotate an object around an arbitrary axis in object space
var rotObjectMatrix;
function rotateAroundObjectAxis(object, axis, radians) {
    rotObjectMatrix = new THREE.Matrix4();
    rotObjectMatrix.makeRotationAxis(axis.normalize(), radians);

    // old code for Three.JS pre r54:
    // object.matrix.multiplySelf(rotObjectMatrix);      // post-multiply
    // new code for Three.JS r55+:
    object.matrix.multiply(rotObjectMatrix);

    // old code for Three.js pre r49:
    // object.rotation.getRotationFromMatrix(object.matrix, object.scale);
    // old code for Three.js r50-r58:
    // object.rotation.setEulerFromRotationMatrix(object.matrix);
    // new code for Three.js r59+:
    object.rotation.setFromRotationMatrix(object.matrix);
}

var rotWorldMatrix;
// Rotate an object around an arbitrary axis in world space       
function rotateAroundWorldAxis(object, axis, radians) {
    rotWorldMatrix = new THREE.Matrix4();
    rotWorldMatrix.makeRotationAxis(axis.normalize(), radians);

    // old code for Three.JS pre r54:
    //  rotWorldMatrix.multiply(object.matrix);
    // new code for Three.JS r55+:
    rotWorldMatrix.multiply(object.matrix);                // pre-multiply

    object.matrix = rotWorldMatrix;

    // old code for Three.js pre r49:
    // object.rotation.getRotationFromMatrix(object.matrix, object.scale);
    // old code for Three.js pre r59:
    // object.rotation.setEulerFromRotationMatrix(object.matrix);
    // code for r59+:
    object.rotation.setFromRotationMatrix(object.matrix);
}

So you should call these functions within your anim function (requestAnimFrame callback), resulting in a rotation of 90 degrees on the x-axis:

var xAxis = new THREE.Vector3(1,0,0);
rotateAroundWorldAxis(mesh, xAxis, Math.PI / 180);

Session state can only be used when enableSessionState is set to true either in a configuration

I want to let everyone know that sometimes this error just is a result of some weird memory error. Restart your pc and go back into visual studio and it will be gone!! Bizarre! Try that before you start playing around with your web config file etc like I did!!!! ;-)

How can I use jQuery to move a div across the screen

In jQuery 1.2 and newer you no longer have to position the element absolutely; you can use normal relative positioning and use += or -= to add to or subtract from properties, e.g.

$("#startAnimation").click(function(){
    $(".toBeAnimated").animate({ 
        marginLeft: "+=250px",
    }, 1000 );
});

And to echo the guy who answered first's advice: Javascript is not performant. Don't overuse animations, or expect things than run nice and fast on your high performance PC on Chrome to look good on a bog-standard PC running IE. Test it, and make sure it degrades well!

jQuery keypress() event not firing?

With jQuery, I've done it this way:

function checkKey(e){
     switch (e.keyCode) {
        case 40:
            alert('down');
            break;
        case 38:
            alert('up');
            break;
        case 37:
            alert('left');
            break;
        case 39:
            alert('right');
            break;
        default:
            alert('???');  
            }      
}

if ($.browser.mozilla) {
    $(document).keypress (checkKey);
} else {
    $(document).keydown (checkKey);
}

Also, try these plugins, which looks like they do all that work for you:

http://www.openjs.com/scripts/events/keyboard_shortcuts

http://www.webappers.com/2008/07/31/bind-a-hot-key-combination-with-jquery-hotkeys/

How do I keep track of pip-installed packages in an Anaconda (Conda) environment?

My which pip shows the following path:

$ which pip
/home/kmario23/anaconda3/bin/pip

So, whatever package I install using pip install <package-name> will have to be reflected in the list of packages when the list is exported using:

$ conda list --export > conda_list.txt

But, I don't. So, instead I used the following command as suggested by several others:

# get environment name by
$ conda-env list

# get list of all installed packages by (conda, pip, etc.,)
$ conda-env export -n <my-environment-name> > all_packages.yml
# if you haven't created any specific env, then just use 'root'

Now, I can see all the packages in my all-packages.yml file.

Swift Bridging Header import issue

Set Precompile Bridging Header to No fix the problem for me.

Function to get yesterday's date in Javascript in format DD/MM/YYYY

You override $today in the if statement.

if($dd<10){$dd='0'+dd} if($mm<10){$mm='0'+$mm} $today = $dd+'/'+$mm+'/'+$yyyy;

It is then not a Date() object anymore - hence the error.

How can I shuffle the lines of a text file on the Unix command line or in a shell script?

here's an awk script

awk 'BEGIN{srand() }
{ lines[++d]=$0 }
END{
    while (1){
    if (e==d) {break}
        RANDOM = int(1 + rand() * d)
        if ( RANDOM in lines  ){
            print lines[RANDOM]
            delete lines[RANDOM]
            ++e
        }
    }
}' file

output

$ cat file
1
2
3
4
5
6
7
8
9
10

$ ./shell.sh
7
5
10
9
6
8
2
1
3
4

Eclipse count lines of code

One possible way to count lines of code in Eclipse:

using the Search / File... menu, select File Search tab, specify \n[\s]* for Containing text (this will not count empty lines), and tick Regular expression.

Hat tip: www.monblocnotes.com/node/2030

multiple figure in latex with captions

Below is an example of multiple figures that I used recently in Latex. You need to call these packages

\usepackage{graphicx}
\usepackage{subfig})


\begin{figure}[H]%

    \centering

    \subfloat[Row1]{{\includegraphics[scale=.36]{1.png} }}%

    \subfloat[Row2]{{\includegraphics[scale=.36]{2.png} }}%

    \subfloat[Row3]{{\includegraphics[scale=.36]{3.png} }}%
    \hfill
    \subfloat[Row4]{{\includegraphics[scale=0.37]{4.png} }}%

    \subfloat[Row5]{{\includegraphics[scale=0.37]{5.png} }}%

    \caption{Multiple figures in latex.}%

    \label{fig:MFL}%

\end{figure}

Select arrow style change

Assume, selectDrop is the class present in your HTML tag.So, this much of code is enough to change default arrow icon:

.selectDrop{
      background: url(../images/icn-down-arrow-light.png) no-repeat right #ddd; /*To change default icon with provided image*/
      -webkit-appearance:none; /*For hiding default pointer of drop-down on Chrome*/
      -moz-appearance:none; /*For hiding default pointer of drop-down on Mozilla*/
      background-position-x: 90%; /*Adjust according to width of dropdown*/
    }

Disabling Strict Standards in PHP 5.4

If you would need to disable E_DEPRACATED also, use:

php_value error_reporting 22527

In my case CMS Made Simple was complaining "E_STRICT is enabled in the error_reporting" as well as "E_DEPRECATED is enabled". Adding that one line to .htaccess solved both misconfigurations.

How to download a Nuget package without nuget.exe or Visual Studio extension?

Although building the URL or using tools is still possible, it is not needed anymore.

https://www.nuget.org/ currently has a download link named "Download package", that is available even if you don't have an account on the site.

(at the bottom of the right column).


Example of EntityFramework's detail page: https://www.nuget.org/packages/EntityFramework/: (Updated after comment of kwitee.)

Example of EntityFramework's detail page

ClassNotFoundException com.mysql.jdbc.Driver

The only thing that worked for me was downloading the mysql-connector-java-5.0.8-bin.jar directly from the MySQL website:

http://dev.mysql.com/downloads/connector/j/3.1.html

Then if you're using Eclipse paste this mysql-connector-java-5.0.8-bin.jar in the WEB-INF lib folder

If doesn't works try with any of the solutions posted in this link: http://javarevisited.blogspot.com/2012/03/jdbc-javalangclassnotfoundexception.html

Object passed as parameter to another class, by value or reference?

Assuming someTestObj is a class and not a struct, the object is passed by reference, which means that both obj and someTestObj refer to the same object. E.g. changing name in one will change it in the other. However, unlike if you passed it using the ref keyword, setting obj = somethingElse will not change someTestObj.

Enterprise app deployment doesn't work on iOS 7.1

The universal solution is to connect your device to Mac and to observe what's going on during installation. I got an error:

Could not load download manifest with underlying error: Error Domain=NSURLErrorDomain Code=-1202 "Cannot connect to the Store" UserInfo=0x146635d0 {NSLocalizedDescription=Cannot connect to the Store, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSLocalizedFailureReason=A secure connection could not be established. Please check your Date & Time settings., NSErrorFailingURLStringKey=https://myserver.com/app/manifest.plist, NSUnderlyingError=0x14678880 "The certificate for this server is invalid. You might be connecting to a server that is pretending to be “myserver.com” which could put your confidential information at risk.", NSURLErrorFailingURLPeerTrustErrorKey=, NSErrorFailingURLKey=https://myserver.com/app/manifest.plist}

There was even the suggestion in that error to check date settings. For some reason the date was 1 January 1970. Setting correct date solved the problem.

Assembly Language - How to do Modulo?

If you compute modulo a power of two, using bitwise AND is simpler and generally faster than performing division. If b is a power of two, a % b == a & (b - 1).

For example, let's take a value in register EAX, modulo 64.
The simplest way would be AND EAX, 63, because 63 is 111111 in binary.

The masked, higher digits are not of interest to us. Try it out!

Analogically, instead of using MUL or DIV with powers of two, bit-shifting is the way to go. Beware signed integers, though!

Possible to view PHP code of a website?

By using exploits or on badly configured servers it could be possible to download your PHP source. You could however either obfuscate and/or encrypt your code (using Zend Guard, Ioncube or a similar app) if you want to make sure your source will not be readable (to be accurate, obfuscation by itself could be reversed given enough time/resources, but I haven't found an IonCube or Zend Guard decryptor yet...).

Using context in a fragment

Inside fragment for kotlin sample would help someone

textViewStatus.setTextColor(ContextCompat.getColor(context!!, R.color.red))

if you use databinding;

bindingView.textViewStatus.setTextColor(ContextCompat.getColor(context!!, R.color.red))

Where bindingView is initialized in onCreateView like this

private lateinit var bindingView: FragmentBookingHistoryDetailBinding

bindingView = DataBindingUtil.inflate(inflater, R.layout.your_layout_xml, container, false)

Where is web.xml in Eclipse Dynamic Web Project

When you create a Dynamic Web Project you have the option to automatically create the web.xml file. If you don't mark that, the eclipse doesn't create it...

So, you have to add a new web.xml file in the WEB-INF folder.

To add a web.xml click on Next -> Next instead of Finish. You will find it on the final screen of the wizard.

How to determine the Boost version on a system?

Might be already answered, but you can try this simple program to determine if and what installation of boost you have :

#include<boost/version.hpp>
#include<iostream>
using namespace std;
int main()
{
cout<<BOOST_VERSION<<endl;
return 0;
}

Round to at most 2 decimal places (only if necessary)

Slight modification of this answer that seems to work well.

Function

function roundToStep(value, stepParam) {
   var step = stepParam || 1.0;
   var inv = 1.0 / step;
   return Math.round(value * inv) / inv;
}

Usage

roundToStep(2.55) = 3
roundToStep(2.55, 0.1) = 2.6
roundToStep(2.55, 0.01) = 2.55

Only read selected columns

You do it like this:

df = read.table("file.txt", nrows=1, header=TRUE, sep="\t", stringsAsFactors=FALSE)
colClasses = as.list(apply(df, 2, class))
needCols = c("Year", "Jan", "Feb", "Mar", "Apr", "May", "Jun")
colClasses[!names(colClasses) %in% needCols] = list(NULL)
df = read.table("file.txt", header=TRUE, colClasses=colClasses, sep="\t", stringsAsFactors=FALSE)

How to force Chrome's script debugger to reload javascript?

enter image description here

The context menu shown above is accessible by right clicking / presssing & holding the "reload" button, while Chrome Dev Tools is opened.

Empty cache and hard reload works best for me.

Another Advantage: This option keeps all other opened tabs and website data untouched. It only reloads and clears the current page.

JavaScript Promises - reject vs. throw

There is no advantage of using one vs the other, but, there is a specific case where throw won't work. However, those cases can be fixed.

Any time you are inside of a promise callback, you can use throw. However, if you're in any other asynchronous callback, you must use reject.

For example, this won't trigger the catch:

_x000D_
_x000D_
new Promise(function() {
  setTimeout(function() {
    throw 'or nah';
    // return Promise.reject('or nah'); also won't work
  }, 1000);
}).catch(function(e) {
  console.log(e); // doesn't happen
});
_x000D_
_x000D_
_x000D_

Instead you're left with an unresolved promise and an uncaught exception. That is a case where you would want to instead use reject. However, you could fix this in two ways.

  1. by using the original Promise's reject function inside the timeout:

_x000D_
_x000D_
new Promise(function(resolve, reject) {
  setTimeout(function() {
    reject('or nah');
  }, 1000);
}).catch(function(e) {
  console.log(e); // works!
});
_x000D_
_x000D_
_x000D_

  1. by promisifying the timeout:

_x000D_
_x000D_
function timeout(duration) { // Thanks joews
  return new Promise(function(resolve) {
    setTimeout(resolve, duration);
  });
}

timeout(1000).then(function() {
  throw 'worky!';
  // return Promise.reject('worky'); also works
}).catch(function(e) {
  console.log(e); // 'worky!'
});
_x000D_
_x000D_
_x000D_

Forward declaring an enum in C++

[My answer is wrong, but I've left it here because the comments are useful].

Forward declaring enums is non-standard, because pointers to different enum types are not guaranteed to be the same size. The compiler may need to see the definition to know what size pointers can be used with this type.

In practice, at least on all the popular compilers, pointers to enums are a consistent size. Forward declaration of enums is provided as a language extension by Visual C++, for example.

Python conversion between coordinates

Using numpy, you can define the following:

import numpy as np

def cart2pol(x, y):
    rho = np.sqrt(x**2 + y**2)
    phi = np.arctan2(y, x)
    return(rho, phi)

def pol2cart(rho, phi):
    x = rho * np.cos(phi)
    y = rho * np.sin(phi)
    return(x, y)

R apply function with multiple parameters

To further generalize @Alexander's example, outer is relevant in cases where a function must compute itself on each pair of vector values:

vars1<-c(1,2,3)
vars2<-c(10,20,30)
mult_one<-function(var1,var2)
{
   var1*var2
}
outer(vars1,vars2,mult_one)

gives:

> outer(vars1, vars2, mult_one)
     [,1] [,2] [,3]
[1,]   10   20   30
[2,]   20   40   60
[3,]   30   60   90

Java : Comparable vs Comparator

When your class implements Comparable, the compareTo method of the class is defining the "natural" ordering of that object. That method is contractually obligated (though not demanded) to be in line with other methods on that object, such as a 0 should always be returned for objects when the .equals() comparisons return true.

A Comparator is its own definition of how to compare two objects, and can be used to compare objects in a way that might not align with the natural ordering.

For example, Strings are generally compared alphabetically. Thus the "a".compareTo("b") would use alphabetical comparisons. If you wanted to compare Strings on length, you would need to write a custom comparator.

In short, there isn't much difference. They are both ends to similar means. In general implement comparable for natural order, (natural order definition is obviously open to interpretation), and write a comparator for other sorting or comparison needs.

How to resize html canvas element?

This worked for me just now:

<canvas id="c" height="100" width="100" style="border:1px solid red"></canvas>
<script>
var c = document.getElementById('c');
alert(c.height + ' ' + c.width);
c.height = 200;
c.width = 200;
alert(c.height + ' ' + c.width);
</script>

Insert new column into table in sqlite?

You have two options. First, you could simply add a new column with the following:

ALTER TABLE {tableName} ADD COLUMN COLNew {type};

Second, and more complicatedly, but would actually put the column where you want it, would be to rename the table:

ALTER TABLE {tableName} RENAME TO TempOldTable;

Then create the new table with the missing column:

CREATE TABLE {tableName} (name TEXT, COLNew {type} DEFAULT {defaultValue}, qty INTEGER, rate REAL);

And populate it with the old data:

INSERT INTO {tableName} (name, qty, rate) SELECT name, qty, rate FROM TempOldTable;

Then delete the old table:

DROP TABLE TempOldTable;

I'd much prefer the second option, as it will allow you to completely rename everything if need be.

How to pass the -D System properties while testing on Eclipse?

You can add command line arguments to your run configuration. Just edit the run configuration and add -Dmyprop=value (or whatever) to the VM Arguments Box.

How do you wait for input on the same Console.WriteLine() line?

As Matt has said, use Console.Write. I would also recommend explicitly flushing the output, however - I believe WriteLine does this automatically, but I'd seen oddities when just using Console.Write and then waiting. So Matt's code becomes:

Console.Write("What is your name? ");
Console.Out.Flush();
var name = Console.ReadLine();

Lost httpd.conf file located apache

Get the path of running Apache

$ ps -ef | grep apache
apache   12846 14590  0 Oct20 ?        00:00:00 /usr/sbin/apache2

Append -V argument to the path

$ /usr/sbin/apache2 -V | grep SERVER_CONFIG_FILE
-D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"

Reference:
http://commanigy.com/blog/2011/6/8/finding-apache-configuration-file-httpd-conf-location

Javascript Append Child AFTER Element

You need to append the new element to existing element's parent before element's next sibling. Like:

var parentGuest = document.getElementById("one");
var childGuest = document.createElement("li");
childGuest.id = "two";
parentGuest.parentNode.insertBefore(childGuest, parentGuest.nextSibling);

Or if you want just append it, then:

var parentGuest = document.getElementById("one"); 
var childGuest = document.createElement("li"); 
childGuest.id = "two"; 
parentGuest.parentNode.appendChild(childGuest);

Collection was modified; enumeration operation may not execute

You can also lock your subscribers dictionary to prevent it from being modified whenever its being looped:

 lock (subscribers)
 {
         foreach (var subscriber in subscribers)
         {
               //do something
         }
 }

What's the yield keyword in JavaScript?

Yeild keyword in javaScript function makes it generator,

what is generator in javaScript?

A generator is a function that produces a sequence of results instead of a single value, i.e you generate ?a series of values

Meaning generators helps us work asynchronously with the help iterators, Oh now what the hack iterators are? really?

Iterators are mean through which we are able to access items one at a time

from where iterator help us accessing item one at a time? it help us accessing items through generator functions,

generator functions are those in which we use yeild keyword, yield keyword help us in pausing and resuming execution of function

here is quick example

function *getMeDrink() {

    let question1 = yield 'soda or beer' // execution will pause here because of yield

 if (question1 == 'soda') {

            return 'here you get your soda'

    }

    if (question1 == 'beer') {

        let question2 = yield 'Whats your age' // execution will pause here because of yield

        if (question2 > 18) {

            return "ok you are eligible for it"

        } else {

            return 'Shhhh!!!!'

        }
    }
}


let _getMeDrink = getMeDrink() // initialize it

_getMeDrink.next().value  // "soda or beer"

_getMeDrink.next('beer').value  // "Whats your age"

_getMeDrink.next('20').value  // "ok you are eligible for it"

_getMeDrink.next().value // undefined

let me brifly explain what is going on

you noticed execution is being paused at each yeild keyword and we are able to access first yield with help of iterator .next()

this iterates to all yield keywords one at a time and then returns undefined when there is no more yield keywords left in simple words you can say yield keyword is break point where function each time pauses and only resume when call it using iterator

for our case: _getMeDrink.next() this is example of iterator that is helping us accessing each break point in function

Example of Generators: async/await

if you see implementation of async/await you will see generator functions & promises are used to make async/await work

please point out any suggestions is welcomed

jQuery - setting the selected value of a select control via its text description

Try this...to select the option with text myText

$("#my-Select option[text=" + myText +"]").prop("selected", true);

I have 2 dates in PHP, how can I run a foreach loop to go through all of those days?

User this function:-

function dateRange($first, $last, $step = '+1 day', $format = 'Y-m-d' ) {
                $dates = array();
                $current = strtotime($first);
                $last = strtotime($last);

                while( $current <= $last ) {    
                    $dates[] = date($format, $current);
                    $current = strtotime($step, $current);
                }
                return $dates;
        }

Usage / function call:-

Increase by one day:-

dateRange($start, $end); //increment is set to 1 day.

Increase by Month:-

dateRange($start, $end, "+1 month");//increase by one month

use third parameter if you like to set date format:-

   dateRange($start, $end, "+1 month", "Y-m-d H:i:s");//increase by one month and format is mysql datetime

Error in installation a R package

After using the wrong quotation mark characters in install.packages(), correcting the quote marks yielded the "cannot remove prior installation" error. Closing and restarting R worked.

"ssl module in Python is not available" when installing package with pip3

If you are on OSX and in case the other solutions didn't work for you (just like me).

You can try uninstalling python3 and upgrade pip3

brew uninstall --ignore-dependencies python3
pip3 install --upgrade pip   

This worked for me ;)

How do you round a floating point number in Perl?

cat table |
  perl -ne '/\d+\s+(\d+)\s+(\S+)/ && print "".**int**(log($1)/log(2))."\t$2\n";' 

tr:hover not working

You can simply use background CSS property as follows:

tr:hover{
    background: #F1F1F2;    
}

Working example

Java Immutable Collections

Pure4J supports what you are after, in two ways.

First, it provides an @ImmutableValue annotation, so that you can annotate a class to say that it is immutable. There is a maven plugin to allow you to check that your code actually is immutable (use of final etc.).

Second, it provides the persistent collections from Clojure, (with added generics) and ensures that elements added to the collections are immutable. Performance of these is apparently pretty good. Collections are all immutable, but implement java collections interfaces (and generics) for inspection. Mutation returns new collections.

Disclaimer: I'm the developer of this

how to show lines in common (reverse diff)?

In Windows you can use a Powershell Script with CompareObject

compare-object -IncludeEqual -ExcludeDifferent -PassThru (get-content A.txt) (get-content B.txt)> MATCHING.txt | Out-Null #Find Matching Lines

CompareObject:

  • IncludeEqual without -ExcludeDifferent : Everything
  • ExcludeDifferent without -InclueEqual : Nothing

installing requests module in python 2.7 windows

There are four options here:

  1. Get virtualenv set up. Each virtual environment you create will automatically have pip.

  2. Get pip set up globally.

  3. Learn how to install Python packages manually—in most cases it's as simple as download, unzip, python setup.py install, but not always.

  4. Use Christoph Gohlke's binary installers.

ReactJS call parent method

2019 Update with react 16+ and ES6

Posting this since React.createClass is deprecated from react version 16 and the new Javascript ES6 will give you more benefits.

Parent

import React, {Component} from 'react';
import Child from './Child';
  
export default class Parent extends Component {

  es6Function = (value) => {
    console.log(value)
  }

  simplifiedFunction (value) {
    console.log(value)
  }

  render () {
  return (
    <div>
    <Child
          es6Function = {this.es6Function}
          simplifiedFunction = {this.simplifiedFunction} 
        />
    </div>
    )
  }

}

Child

import React, {Component} from 'react';

export default class Child extends Component {

  render () {
  return (
    <div>
    <h1 onClick= { () =>
            this.props.simplifiedFunction(<SomethingThatYouWantToPassIn>)
          }
        > Something</h1>
    </div>
    )
  }
}

Simplified stateless child as ES6 constant

import React from 'react';

const Child = () => {
  return (
    <div>
    <h1 onClick= { () =>
        this.props.es6Function(<SomethingThatYouWantToPassIn>)
      }
      > Something</h1>
    </div>
  )

}
export default Child;

error: No resource identifier found for attribute 'adSize' in package 'com.google.example' main.xml

I also faced the same problem, I was using GoogleAdMobAdsSDK-4.1.0.jar then I tried with GoogleAdMobAdsSDK-4.0.4.jar now it is working fine, It is problem with jar file as per my experience.

Add padding to HTML text input field

padding-right works for me in Firefox/Chrome on Windows but not in IE. Welcome to the wonderful world of IE standards non-compliance.

See: http://jsfiddle.net/SfPju/466/

HTML

<input type="text" class="foo" value="abcdefghijklmnopqrstuvwxyz"/>

CSS

.foo
{
    padding-right: 20px;
}

Set selected radio from radio group with a value

$("input[name='RadioTest'][value='2']").prop('checked', true);

JS fiddle Demo

JavaScript: Class.method vs. Class.prototype.method

Yes, the first function has no relationship with an object instance of that constructor function, you can consider it like a 'static method'.

In JavaScript functions are first-class objects, that means you can treat them just like any object, in this case, you are only adding a property to the function object.

The second function, as you are extending the constructor function prototype, it will be available to all the object instances created with the new keyword, and the context within that function (the this keyword) will refer to the actual object instance where you call it.

Consider this example:

// constructor function
function MyClass () {
  var privateVariable; // private member only available within the constructor fn

  this.privilegedMethod = function () { // it can access private members
    //..
  };
}

// A 'static method', it's just like a normal function 
// it has no relation with any 'MyClass' object instance
MyClass.staticMethod = function () {};

MyClass.prototype.publicMethod = function () {
  // the 'this' keyword refers to the object instance
  // you can access only 'privileged' and 'public' members
};

var myObj = new MyClass(); // new object instance

myObj.publicMethod();
MyClass.staticMethod();

get url content PHP

original answer moved to this topic .

Update style of a component onScroll in React.js

You should bind the listener in componentDidMount, that way it's only created once. You should be able to store the style in state, the listener was probably the cause of performance issues.

Something like this:

componentDidMount: function() {
    window.addEventListener('scroll', this.handleScroll);
},

componentWillUnmount: function() {
    window.removeEventListener('scroll', this.handleScroll);
},

handleScroll: function(event) {
    let scrollTop = event.srcElement.body.scrollTop,
        itemTranslate = Math.min(0, scrollTop/3 - 60);

    this.setState({
      transform: itemTranslate
    });
},

Creating a dynamic choice field

You can declare the field as a first-class attribute of your form and just set choices dynamically:

class WaypointForm(forms.Form):
    waypoints = forms.ChoiceField(choices=[])

    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
        waypoint_choices = [(o.id, str(o)) for o in Waypoint.objects.filter(user=user)]
        self.fields['waypoints'].choices = waypoint_choices

You can also use a ModelChoiceField and set the queryset on init in a similar manner.

Is java.sql.Timestamp timezone specific?

For Mysql, we have a limitation. In the driver Mysql doc, we have :

The following are some known issues and limitations for MySQL Connector/J: When Connector/J retrieves timestamps for a daylight saving time (DST) switch day using the getTimeStamp() method on the result set, some of the returned values might be wrong. The errors can be avoided by using the following connection options when connecting to a database:

useTimezone=true
useLegacyDatetimeCode=false
serverTimezone=UTC

So, when we do not use this parameters and we call setTimestamp or getTimestamp with calendar or without calendar, we have the timestamp in the jvm timezone.

Example :

The jvm timezone is GMT+2. In the database, we have a timestamp : 1461100256 = 19/04/16 21:10:56,000000000 GMT

Properties props = new Properties();
props.setProperty("user", "root");
props.setProperty("password", "");
props.setProperty("useTimezone", "true");
props.setProperty("useLegacyDatetimeCode", "false");
props.setProperty("serverTimezone", "UTC");
Connection con = DriverManager.getConnection(conString, props);
......
Calendar nowGMT = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
Calendar nowGMTPlus4 = Calendar.getInstance(TimeZone.getTimeZone("GMT+4"));
......
rs.getTimestamp("timestampColumn");//Oracle driver convert date to jvm timezone and Mysql convert date to GMT (specified in the parameter)
rs.getTimestamp("timestampColumn", nowGMT);//convert date to GMT 
rs.getTimestamp("timestampColumn", nowGMTPlus4);//convert date to GMT+4 timezone

The first method returns : 1461100256000 = 19/04/2016 - 21:10:56 GMT

The second method returns : 1461100256000 = 19/04/2016 - 21:10:56 GMT

The third method returns : 1461085856000 = 19/04/2016 - 17:10:56 GMT

Instead of Oracle, when we use the same calls, we have :

The first method returns : 1461093056000 = 19/04/2016 - 19:10:56 GMT

The second method returns : 1461100256000 = 19/04/2016 - 21:10:56 GMT

The third method returns : 1461085856000 = 19/04/2016 - 17:10:56 GMT

NB : It is not necessary to specify the parameters for Oracle.

How to modify a text file?

Python's mmap module will allow you to insert into a file. The following sample shows how it can be done in Unix (Windows mmap may be different). Note that this does not handle all error conditions and you might corrupt or lose the original file. Also, this won't handle unicode strings.

import os
from mmap import mmap

def insert(filename, str, pos):
    if len(str) < 1:
        # nothing to insert
        return

    f = open(filename, 'r+')
    m = mmap(f.fileno(), os.path.getsize(filename))
    origSize = m.size()

    # or this could be an error
    if pos > origSize:
        pos = origSize
    elif pos < 0:
        pos = 0

    m.resize(origSize + len(str))
    m[pos+len(str):] = m[pos:origSize]
    m[pos:pos+len(str)] = str
    m.close()
    f.close()

It is also possible to do this without mmap with files opened in 'r+' mode, but it is less convenient and less efficient as you'd have to read and temporarily store the contents of the file from the insertion position to EOF - which might be huge.

What does HTTP/1.1 302 mean exactly?

From RFC 2616 (the Hypertext Transfer Protocol Specification):

10.3.3 302 Found

   The requested resource resides temporarily under a different URI.
   Since the redirection might be altered on occasion, the client SHOULD
   continue to use the Request-URI for future requests.  This response
   is only cacheable if indicated by a Cache-Control or Expires header
   field.

   The temporary URI SHOULD be given by the Location field in the
   response. Unless the request method was HEAD, the entity of the
   response SHOULD contain a short hypertext note with a hyperlink to
   the new URI(s).

Source:

http://www.ietf.org/rfc/rfc2616.txt

C# refresh DataGridView when updating or inserted on another form

my datagridview is editonEnter mode . so it refresh only after i leave cell or after i revisit and exit cell twice.

to trigger this iimedately . i unfocus from datagridview . then refocus it.

 this.SelectNextControl(dgv1,true,true,false,true);    
 Application.DoEvents();    //this does magic
 dgv1.Focus();

Excel VBA Run-time error '13' Type mismatch

Diogo

Justin has given you some very fine tips :)

You will also get that error if the cell where you are performing the calculation has an error resulting from a formula.

For example if Cell A1 has #DIV/0! error then you will get "Excel VBA Run-time error '13' Type mismatch" when performing this code

Sheets("Sheet1").Range("A1").Value - 1

I have made some slight changes to your code. Could you please test it for me? Copy the code with the line numbers as I have deliberately put them there.

Option Explicit

Sub Sample()
  Dim ws As Worksheet
  Dim x As Integer, i As Integer, a As Integer, y As Integer
  Dim name As String
  Dim lastRow As Long
10        On Error GoTo Whoa

20        Application.ScreenUpdating = False

30        name = InputBox("Please insert the name of the sheet")

40        If Len(Trim(name)) = 0 Then Exit Sub

50        Set ws = Sheets(name)

60        With ws
70            If Not IsError(.Range("BE4").Value) Then
80                x = Val(.Range("BE4").Value)
90            Else
100               MsgBox "Please check the value of cell BE4. It seems to have an error"
110               GoTo LetsContinue
120           End If

130           .Range("BF4").Value = x

140           lastRow = .Range("BE" & Rows.Count).End(xlUp).Row

150           For i = 5 To lastRow
160               If IsError(.Range("BE" & i)) Then
170                   MsgBox "Please check the value of cell BE" & i & ". It seems to have an error"
180                   GoTo LetsContinue
190               End If

200               a = 0: y = Val(.Range("BE" & i))
210               If y <> x Then
220                   If y <> 0 Then
230                       If y = 3 Then
240                           a = x
250                           .Range("BF" & i) = Val(.Range("BE" & i)) - x

260                           x = Val(.Range("BE" & i)) - x
270                       End If
280                       .Range("BF" & i) = Val(.Range("BE" & i)) - a
290                       x = Val(.Range("BE" & i)) - a
300                   Else
310                       .Range("BF" & i).ClearContents
320                   End If
330               Else
340                   .Range("BF" & i).ClearContents
350               End If
360           Next i
370       End With

LetsContinue:
380       Application.ScreenUpdating = True
390       Exit Sub
Whoa:
400       MsgBox "Error Description :" & Err.Description & vbNewLine & _
         "Error at line     : " & Erl
410       Resume LetsContinue
End Sub

How to use OpenCV SimpleBlobDetector

Python: Reads image blob.jpg and performs blob detection with different parameters.

#!/usr/bin/python

# Standard imports
import cv2
import numpy as np;

# Read image
im = cv2.imread("blob.jpg")

# Setup SimpleBlobDetector parameters.
params = cv2.SimpleBlobDetector_Params()

# Change thresholds
params.minThreshold = 10
params.maxThreshold = 200


# Filter by Area.
params.filterByArea = True
params.minArea = 1500

# Filter by Circularity
params.filterByCircularity = True
params.minCircularity = 0.1

# Filter by Convexity
params.filterByConvexity = True
params.minConvexity = 0.87

# Filter by Inertia
params.filterByInertia = True
params.minInertiaRatio = 0.01

# Create a detector with the parameters
detector = cv2.SimpleBlobDetector(params)


# Detect blobs.
keypoints = detector.detect(im)

# Draw detected blobs as red circles.
# cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS ensures
# the size of the circle corresponds to the size of blob

im_with_keypoints = cv2.drawKeypoints(im, keypoints, np.array([]), (0,0,255), cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)

# Show blobs
cv2.imshow("Keypoints", im_with_keypoints)
cv2.waitKey(0)

C++: Reads image blob.jpg and performs blob detection with different parameters.

#include "opencv2/opencv.hpp"

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    // Read image
#if CV_MAJOR_VERSION < 3   // If you are using OpenCV 2
    Mat im = imread("blob.jpg", CV_LOAD_IMAGE_GRAYSCALE);
#else
    Mat im = imread("blob.jpg", IMREAD_GRAYSCALE);
#endif

    // Setup SimpleBlobDetector parameters.
    SimpleBlobDetector::Params params;

    // Change thresholds
    params.minThreshold = 10;
    params.maxThreshold = 200;

    // Filter by Area.
    params.filterByArea = true;
    params.minArea = 1500;

    // Filter by Circularity
    params.filterByCircularity = true;
    params.minCircularity = 0.1;

    // Filter by Convexity
    params.filterByConvexity = true;
    params.minConvexity = 0.87;

    // Filter by Inertia
    params.filterByInertia = true;
    params.minInertiaRatio = 0.01;

    // Storage for blobs
    std::vector<KeyPoint> keypoints;

#if CV_MAJOR_VERSION < 3   // If you are using OpenCV 2

    // Set up detector with params
    SimpleBlobDetector detector(params);

    // Detect blobs
    detector.detect(im, keypoints);
#else 

    // Set up detector with params
    Ptr<SimpleBlobDetector> detector = SimpleBlobDetector::create(params);

    // Detect blobs
    detector->detect(im, keypoints);
#endif 

    // Draw detected blobs as red circles.
    // DrawMatchesFlags::DRAW_RICH_KEYPOINTS flag ensures
    // the size of the circle corresponds to the size of blob

    Mat im_with_keypoints;
    drawKeypoints(im, keypoints, im_with_keypoints, Scalar(0, 0, 255), DrawMatchesFlags::DRAW_RICH_KEYPOINTS);

    // Show blobs
    imshow("keypoints", im_with_keypoints);
    waitKey(0);
}

The answer has been copied from this tutorial I wrote at LearnOpenCV.com explaining various parameters of SimpleBlobDetector. You can find additional details about the parameters in the tutorial.

How to get file_get_contents() to work with HTTPS?

I had the same error. Setting allow_url_include = On in php.ini fixed it for me.

Ignore self-signed ssl cert using Jersey Client

After some searching and trawling through some old stackoverflow questions I've found a solution in a previously asked SO question:

Here's the code that I ended up using.

// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager(){
    public X509Certificate[] getAcceptedIssuers(){return null;}
    public void checkClientTrusted(X509Certificate[] certs, String authType){}
    public void checkServerTrusted(X509Certificate[] certs, String authType){}
}};

// Install the all-trusting trust manager
try {
    SSLContext sc = SSLContext.getInstance("TLS");
    sc.init(null, trustAllCerts, new SecureRandom());
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
    ;
}

installing vmware tools: location of GCC binary?

sudo apt-get install build-essential is enough to get it working.

PHP filesize MB/KB conversion

A cleaner approach:

function Size($path)
{
    $bytes = sprintf('%u', filesize($path));

    if ($bytes > 0)
    {
        $unit = intval(log($bytes, 1024));
        $units = array('B', 'KB', 'MB', 'GB');

        if (array_key_exists($unit, $units) === true)
        {
            return sprintf('%d %s', $bytes / pow(1024, $unit), $units[$unit]);
        }
    }

    return $bytes;
}

ASP.NET strange compilation error

Delete C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\