How to solve a timeout error in Laravel 5

Add above query

ini_set("memory_limit", "10056M");

Creating a selector from a method name with parameters

SEL is a type that represents a selector in Objective-C. The @selector() keyword returns a SEL that you describe. It's not a function pointer and you can't pass it any objects or references of any kind. For each variable in the selector (method), you have to represent that in the call to @selector. For example:

-(void)methodWithNoParameters;
SEL noParameterSelector = @selector(methodWithNoParameters);

-(void)methodWithOneParameter:(id)parameter;
SEL oneParameterSelector = @selector(methodWithOneParameter:); // notice the colon here

-(void)methodWIthTwoParameters:(id)parameterOne and:(id)parameterTwo;
SEL twoParameterSelector = @selector(methodWithTwoParameters:and:); // notice the parameter names are omitted

Selectors are generally passed to delegate methods and to callbacks to specify which method should be called on a specific object during a callback. For instance, when you create a timer, the callback method is specifically defined as:

-(void)someMethod:(NSTimer*)timer;

So when you schedule the timer you would use @selector to specify which method on your object will actually be responsible for the callback:

@implementation MyObject

-(void)myTimerCallback:(NSTimer*)timer
{
    // do some computations
    if( timerShouldEnd ) {
      [timer invalidate];
    }
}

@end

// ...

int main(int argc, const char **argv)
{
    // do setup stuff
    MyObject* obj = [[MyObject alloc] init];
    SEL mySelector = @selector(myTimerCallback:);
    [NSTimer scheduledTimerWithTimeInterval:30.0 target:obj selector:mySelector userInfo:nil repeats:YES];
    // do some tear-down
    return 0;
}

In this case you are specifying that the object obj be messaged with myTimerCallback every 30 seconds.

Div table-cell vertical align not working

Float it with another wrapper without using display: table;, it works:

<div style="float: right;">
   <div style="display: table-cell; vertical-align: middle; width: 50%; height: 50%;">I am vertically aligned on your right! ^^</div>
</div>

SQL Server : Arithmetic overflow error converting expression to data type int

On my side, this error came from the data type "INT' in the Null values column. The error is resolved by just changing the data a type to varchar.

Convert from MySQL datetime to another format with PHP

An easier way would be to format the date directly in the MySQL query, instead of PHP. See the MySQL manual entry for DATE_FORMAT.

If you'd rather do it in PHP, then you need the date function, but you'll have to convert your database value into a timestamp first.

How to use zIndex in react-native

I believe there are different ways to do this based on what you need exactly, but one way would be to just put both Elements A and B inside Parent A.

    <View style={{ position: 'absolute' }}>    // parent of A
        <View style={{ zIndex: 1 }} />  // element A
        <View style={{ zIndex: 1 }} />  // element A
        <View style={{ zIndex: 0, position: 'absolute' }} />  // element B
    </View>

Section vs Article HTML5

I'd use <article> for a text block that is totally unrelated to the other blocks on the page. <section>, on the other hand, would be a divider to separate a document which have are related to each other.

Now, i'm not sure what you have in your videos, newsfeed etc, but here's an example (there's no REAL right or wrong, just a guideline of how I use these tags):

<article>
    <h1>People</h1>
    <p>text about people</p>
    <section>
        <h1>fat people</h1>
        <p>text about fat people</p>
    </section>
    <section>
        <h1>skinny people</p>
        <p>text about skinny people</p>
    </section>
</article>
<article>
    <h1>Cars</h1>
    <p>text about cars</p>
    <section>
        <h1>Fast Cars</h1>
        <p>text about fast cars</p>
    </section>
</article>

As you can see, the sections are still relevant to each other, but as long as they're inside a block that groups them. Sections DONT have to be inside articles. They can be in the body of a document, but i use sections in the body, when the whole document is one article.

e.g.

<body>
    <h1>Cars</h1>
    <p>text about cars</p>
    <section>
        <h1>Fast Cars</h1>
        <p>text about fast cars</p>
    </section>
</body>

Hope this makes sense.

How does HTTP file upload work?

An HTTP message may have a body of data sent after the header lines. In a response, this is where the requested resource is returned to the client (the most common use of the message body), or perhaps explanatory text if there's an error. In a request, this is where user-entered data or uploaded files are sent to the server.

http://www.tutorialspoint.com/http/http_messages.htm

How do I center align horizontal <UL> menu?

Here's a good article on how to do it in a pretty rock-solid way, without any hacks and full cross-browser support. Works for me:

--> http://matthewjamestaylor.com/blog/beautiful-css-centered-menus-no-hacks-full-cross-browser-support

Is there any way to call a function periodically in JavaScript?

You will want to have a look at setInterval() and setTimeout().

Here is a decent tutorial article.

how to get yesterday's date in C#

var yesterday = DateTime.Now.AddDays(-1);

JavaScript ternary operator example with functions

I know question is already answered.

But let me add one point here. This is not only case of true or false. See below:

var val="Do";

Var c= (val == "Do" || val == "Done")
          ? 7
          : 0

Here if val is Do or Done then c will be 7 else it will be zero. In this case c will be 7.

This is actually another perspective of this operator.

Binding value to input in Angular JS

You don't need to set the value at all. ng-model takes care of it all:

set the input value from the model
update the model value when you change the input
update the input value when you change the model from js

Here's the fiddle for this: http://jsfiddle.net/terebentina/9mFpp/

How can I connect to Android with ADB over TCP?

First you must connect your device via USB

Then connect your device to WIFI and get the IP address. While still connect via usb type this in command line or via Android Studio Terminal

adb tcpip 5555
adb connect <device IP>:5555

You will see these messages:

restarting in TCP mode port: 5555
connected to 172.11.0.16:5555

Now remove the USB cable and you will still see your logcat as normal

Done. Enjoy

Display Image On Text Link Hover CSS Only

I did something like that:

HTML:

<p class='parent'>text text text</p>
<img class='child' src='idk.png'>

CSS:

.child {
    visibility: hidden;
}

.parent:hover .child {
    visibility: visible;
}

How can I stop "property does not exist on type JQuery" syntax errors when using Typescript?

Since printArea is a jQuery plugin it is not included in jquery.d.ts.

You need to create a jquery.printArea.ts definition file.

If you create a complete definition file for the plugin you may want to submit it to DefinitelyTyped.

Easiest way to make lua script wait/pause/sleep/block for a few seconds?

You can use:

os.execute("sleep 1") -- I think you can do every command of CMD using os.execute("command")

or you can use:

function wait(waitTime)
    timer = os.time()
    repeat until os.time() > timer + waitTime
end

wait(YourNumberHere)

Count the items from a IEnumerable<T> without iterating?

Result of the IEnumerable.Count() function may be wrong. This is a very simple sample to test:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;

namespace Test
{
  class Program
  {
    static void Main(string[] args)
    {
      var test = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 };
      var result = test.Split(7);
      int cnt = 0;

      foreach (IEnumerable<int> chunk in result)
      {
        cnt = chunk.Count();
        Console.WriteLine(cnt);
      }
      cnt = result.Count();
      Console.WriteLine(cnt);
      Console.ReadLine();
    }
  }

  static class LinqExt
  {
    public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> source, int chunkLength)
    {
      if (chunkLength <= 0)
        throw new ArgumentOutOfRangeException("chunkLength", "chunkLength must be greater than 0");

      IEnumerable<T> result = null;
      using (IEnumerator<T> enumerator = source.GetEnumerator())
      {
        while (enumerator.MoveNext())
        {
          result = GetChunk(enumerator, chunkLength);
          yield return result;
        }
      }
    }

    static IEnumerable<T> GetChunk<T>(IEnumerator<T> source, int chunkLength)
    {
      int x = chunkLength;
      do
        yield return source.Current;
      while (--x > 0 && source.MoveNext());
    }
  }
}

Result must be (7,7,3,3) but actual result is (7,7,3,17)

pull out p-values and r-squared from a linear regression

I used this lmp function quite a lot of times.

And at one point I decided to add new features to enhance data analysis. I am not in expert in R or statistics but people are usually looking at different information of a linear regression :

p-value
a and b
r²
and of course the aspect of the point distribution

Let's have an example. You have here

Here a reproducible example with different variables:

Ex<-structure(list(X1 = c(-36.8598, -37.1726, -36.4343, -36.8644, 
-37.0599, -34.8818, -31.9907, -37.8304, -34.3367, -31.2984, -33.5731
), X2 = c(64.26, 63.085, 66.36, 61.08, 61.57, 65.04, 72.69, 63.83, 
67.555, 76.06, 68.61), Y1 = c(493.81544, 493.81544, 494.54173, 
494.61364, 494.61381, 494.38717, 494.64122, 493.73265, 494.04246, 
494.92989, 494.98384), Y2 = c(489.704166, 489.704166, 490.710962, 
490.653212, 490.710612, 489.822928, 488.160904, 489.747776, 490.600579, 
488.946738, 490.398958), Y3 = c(-19L, -19L, -19L, -23L, -30L, 
-43L, -43L, -2L, -58L, -47L, -61L)), .Names = c("X1", "X2", "Y1", 
"Y2", "Y3"), row.names = c(NA, 11L), class = "data.frame")


library(reshape2)
library(ggplot2)
Ex2<-melt(Ex,id=c("X1","X2"))
colnames(Ex2)[3:4]<-c("Y","Yvalue")
Ex3<-melt(Ex2,id=c("Y","Yvalue"))
colnames(Ex3)[3:4]<-c("X","Xvalue")

ggplot(Ex3,aes(Xvalue,Yvalue))+
          geom_smooth(method="lm",alpha=0.2,size=1,color="grey")+
          geom_point(size=2)+
          facet_grid(Y~X,scales='free')


#Use the lmp function

lmp <- function (modelobject) {
  if (class(modelobject) != "lm") stop("Not an object of class 'lm' ")
  f <- summary(modelobject)$fstatistic
    p <- pf(f[1],f[2],f[3],lower.tail=F)
    attributes(p) <- NULL
    return(p)
    }

# create function to extract different informations from lm

lmtable<-function (var1,var2,data,signi=NULL){
  #var1= y data : colnames of data as.character, so "Y1" or c("Y1","Y2") for example
  #var2= x data : colnames of data as.character, so "X1" or c("X1","X2") for example
  #data= data in dataframe, variables in columns
  # if signi TRUE, round p-value with 2 digits and add *** if <0.001, ** if < 0.01, * if < 0.05.

  if (class(data) != "data.frame") stop("Not an object of class 'data.frame' ")
  Tabtemp<-data.frame(matrix(NA,ncol=6,nrow=length(var1)*length(var2)))
  for (i in 1:length(var2))
       {
  Tabtemp[((length(var1)*i)-(length(var1)-1)):(length(var1)*i),1]<-var1
  Tabtemp[((length(var1)*i)-(length(var1)-1)):(length(var1)*i),2]<-var2[i]
  colnames(Tabtemp)<-c("Var.y","Var.x","p-value","a","b","r^2")

  for (n in 1:length(var1))
  {
  Tabtemp[(((length(var1)*i)-(length(var1)-1))+n-1),3]<-lmp(lm(data[,var1[n]]~data[,var2[i]],data))

  Tabtemp[(((length(var1)*i)-(length(var1)-1))+n-1),4]<-coef(lm(data[,var1[n]]~data[,var2[i]],data))[1]

  Tabtemp[(((length(var1)*i)-(length(var1)-1))+n-1),5]<-coef(lm(data[,var1[n]]~data[,var2[i]],data))[2]

  Tabtemp[(((length(var1)*i)-(length(var1)-1))+n-1),6]<-summary(lm(data[,var1[n]]~data[,var2[i]],data))$r.squared
  }
  }

  signi2<-data.frame(matrix(NA,ncol=3,nrow=nrow(Tabtemp)))
  signi2[,1]<-ifelse(Tabtemp[,3]<0.001,paste0("***"),ifelse(Tabtemp[,3]<0.01,paste0("**"),ifelse(Tabtemp[,3]<0.05,paste0("*"),paste0(""))))
  signi2[,2]<-round(Tabtemp[,3],2)
  signi2[,3]<-paste0(format(signi2[,2],digits=2),signi2[,1])

  for (l in 1:nrow(Tabtemp))
    {
  Tabtemp$"p-value"[l]<-ifelse(is.null(signi),
         Tabtemp$"p-value"[l],
         ifelse(isTRUE(signi),
                paste0(signi2[,3][l]),
                Tabtemp$"p-value"[l]))
  }

   Tabtemp
}

# ------- EXAMPLES ------

lmtable("Y1","X1",Ex)
lmtable(c("Y1","Y2","Y3"),c("X1","X2"),Ex)
lmtable(c("Y1","Y2","Y3"),c("X1","X2"),Ex,signi=TRUE)

There is certainly a faster solution than this function but it works.

Renaming part of a filename

I like to do this with sed. In you case:

for x in DET01-*.dat; do
    echo $x | sed -r 's/DET01-ABC-(.+)\.dat/mv -v "\0" "DET01-XYZ-\1.dat"/'
done | sh -e

It is best to omit the "sh -e" part first to see what will be executed.

Difference between "or" and || in Ruby?

puts false or true --> prints: false

puts false || true --> prints: true

Make div (height) occupy parent remaining height

Unless I am misunderstanding, you can just add height: 100%; and overflow:hidden; to #down.

#down { 
    background:pink; 
    height:100%; 
    overflow:hidden;
}?

Live DEMO

Edit: Since you do not want to use overflow:hidden;, you can use display: table; for this scenario; however, it is not supported prior to IE 8. (display: table; support)

#container { 
    width: 300px; 
    height: 300px; 
    border:1px solid red;
    display:table;
}

#up { 
    background: green;
    display:table-row;
    height:0; 
}

#down { 
    background:pink;
    display:table-row;
}?

Live DEMO

Note: You have said that you want the #down height to be #container height minus #up height. The display:table; solution does exactly that and this jsfiddle will portray that pretty clearly.

React Hook Warnings for async function in useEffect: useEffect function must return a cleanup function or nothing

void operator could be used here.
Instead of:

React.useEffect(() => {
    async function fetchData() {
    }
    fetchData();
}, []);

React.useEffect(() => {
    (async function fetchData() {
    })()
}, []);

you could write:

React.useEffect(() => {
    void async function fetchData() {
    }();
}, []);

It is a little bit cleaner and prettier.

Async effects could cause memory leaks so it is important to perform cleanup on component unmount. In case of fetch this could look like this:

function App() {
    const [ data, setData ] = React.useState([]);

    React.useEffect(() => {
        const abortController = new AbortController();
        void async function fetchData() {
            try {
                const url = 'https://jsonplaceholder.typicode.com/todos/1';
                const response = await fetch(url, { signal: abortController.signal });
                setData(await response.json());
            } catch (error) {
                console.log('error', error);
            }
        }();
        return () => {
            abortController.abort(); // cancel pending fetch request on component unmount
        };
    }, []);

    return <pre>{JSON.stringify(data, null, 2)}</pre>;
}

Is it possible to use vh minus pixels in a CSS calc()?

It does work indeed. Issue was with my less compiler. It was compiled in to:

.container {
  min-height: calc(-51vh);
}

Fixed with the following code in less file:

.container {
  min-height: calc(~"100vh - 150px");
}

Thanks to this link: Less Aggressive Compilation with CSS3 calc

How to get column values in one comma separated value

MYSQL: To get column values as one comma separated value use GROUP_CONCAT( ) function as

GROUP_CONCAT(  `column_name` )

for example

SELECT GROUP_CONCAT(  `column_name` ) 
FROM  `table_name` 
WHERE 1 
LIMIT 0 , 30

Calculate age based on date of birth

 $dob = $this->dateOfBirth; //Datetime 
        $currentDate = new \DateTime();
        $dateDiff = $dob->diff($currentDate);
        $years = $dateDiff->y;
        $months = $dateDiff->m;
        $days = $dateDiff->d;
        $age = $years .' Year(s)';

        if($years === 0) {
            $age = $months .' Month(s)';
            if($months === 0) {
                $age = $days .' Day(s)';
            }
        }
        return $age;

NLS_NUMERIC_CHARACTERS setting for decimal

You can see your current session settings by querying nls_session_parameters:

select value
from nls_session_parameters
where parameter = 'NLS_NUMERIC_CHARACTERS';

VALUE                                  
----------------------------------------
.,

That may differ from the database defaults, which you can see in nls_database_parameters.

In this session your query errors:

select to_number('100,12') from dual;

Error report -
SQL Error: ORA-01722: invalid number
01722. 00000 -  "invalid number"

I could alter my session, either directly with alter session or by ensuring my client is configured in a way that leads to the setting the string needs (it may be inherited from a operating system or Java locale, for example):

alter session set NLS_NUMERIC_CHARACTERS = ',.';
select to_number('100,12') from dual;

TO_NUMBER('100,12')
-------------------
             100,12

In SQL Developer you can set your preferred value in Tool->Preferences->Database->NLS.

But I can also override that session setting as part of the query, with the optional third nlsparam parameter to to_number(); though that makes the optional second fmt parameter necessary as well, so you'd need to be able pick a suitable format:

alter session set NLS_NUMERIC_CHARACTERS = '.,';
select to_number('100,12', '99999D99', 'NLS_NUMERIC_CHARACTERS='',.''')
from dual;

TO_NUMBER('100,12','99999D99','NLS_NUMERIC_CHARACTERS='',.''')
--------------------------------------------------------------
                                                        100.12

By default the result is still displayed with my session settings, so the decimal separator is still a period.

Return anonymous type results?

BreedId in the Dog table is obviously a foreign key to the corresponding row in the Breed table. If you've got your database set up properly, LINQ to SQL should automatically create an association between the two tables. The resulting Dog class will have a Breed property, and the Breed class should have a Dogs collection. Setting it up this way, you can still return IEnumerable<Dog>, which is an object that includes the breed property. The only caveat is that you need to preload the breed object along with dog objects in the query so they can be accessed after the data context has been disposed, and (as another poster has suggested) execute a method on the collection that will cause the query to be performed immediately (ToArray in this case):

public IEnumerable<Dog> GetDogs()
{
    using (var db = new DogDataContext(ConnectString))
    {
        db.LoadOptions.LoadWith<Dog>(i => i.Breed);
        return db.Dogs.ToArray();
    }

}

It is then trivial to access the breed for each dog:

foreach (var dog in GetDogs())
{
    Console.WriteLine("Dog's Name: {0}", dog.Name);
    Console.WriteLine("Dog's Breed: {0}", dog.Breed.Name);        
}

How to install a Mac application using Terminal

To disable inputting password:

sudo visudo

Then add a new line like below and save then:

# The user can run installer as root without inputting password
yourusername ALL=(root) NOPASSWD: /usr/sbin/installer

Then you run installer without password:

sudo installer -pkg ...

How to hide the border for specified rows of a table?

Use the CSS property border on the <td>s following the <tr>s you do not want to have the border.

In my example I made a class noBorder that I gave to one <tr>. Then I use a simple selector tr.noBorder td to make the border go away for all the <td>s that are inside of <tr>s with the noBorder class by assigning border: 0.

Note that you do not need to provide the unit (i.e. px) if you set something to 0 as it does not matter anyway. Zero is just zero.

_x000D_

table, tr, td {_x000D_
  border: 3px solid red;_x000D_
}_x000D_
tr.noBorder td {_x000D_
  border: 0;_x000D_
}

_x000D_

<table>_x000D_
  <tr>_x000D_
    <td>A1</td>_x000D_
    <td>B1</td>_x000D_
    <td>C1</td>_x000D_
  </tr>_x000D_
  <tr class="noBorder">_x000D_
    <td>A2</td>_x000D_
    <td>B2</td>_x000D_
    <td>C2</td>_x000D_
  </tr>_x000D_
  <tr>_x000D_
    <td>A3</td>_x000D_
    <td>A3</td>_x000D_
    <td>A3</td>_x000D_
  </tr>_x000D_
</table>

_x000D_

Here's the output as an image:

Output from HTML

Hot to get all form elements values using jQuery?

if you want get all values from form in simple array you may be do something like this.

function getValues(form) {
    var listvalues = new Array();
    var datastring = $("#" + form).serializeArray();
    var data = "{";
    for (var x = 0; x < datastring.length; x++) {
        if (data == "{") {
            data += "\"" + datastring[x].name + "\": \"" + datastring[x].value + "\"";
        }
        else {
            data += ",\"" + datastring[x].name + "\": \"" + datastring[x].value + "\"";
        }
    }
    data += "}";
    data = JSON.parse(data);
    listvalues.push(data);
    return listvalues;
};

Understanding the order() function

This seems to explain it.

The definition of order is that a[order(a)] is in increasing order. This works with your example, where the correct order is the fourth, second, first, then third element.

You may have been looking for rank, which returns the rank of the elements
R> a <- c(4.1, 3.2, 6.1, 3.1)
R> order(a)
[1] 4 2 1 3
R> rank(a)
[1] 3 2 4 1
so rank tells you what order the numbers are in, order tells you how to get them in ascending order.

plot(a, rank(a)/length(a)) will give a graph of the CDF. To see why order is useful, though, try plot(a, rank(a)/length(a),type="S") which gives a mess, because the data are not in increasing order

If you did
oo<-order(a)
plot(a[oo],rank(a[oo])/length(a),type="S")
or simply
oo<-order(a)
plot(a[oo],(1:length(a))/length(a)),type="S")
you get a line graph of the CDF.

I'll bet you're thinking of rank.

Calling a PHP function from an HTML form in the same file

Without reloading, using HTML and PHP only it is not possible, but this can be very similar to what you want, but you have to reload:

<?php
    function test() {
        echo $_POST["user"];
    }

    if (isset($_POST[])) { // If it is the first time, it does nothing
        test();
    }
?>

<form action="test.php" method="post">
    <input type="text" name="user" placeholder="enter a text" />
    <input type="submit" value="submit" onclick="test()" />
</form>

angularjs getting previous route path

modification for the code above:

$scope.$on('$locationChangeStart',function(evt, absNewUrl, absOldUrl) {
   console.log('prev path: ' + absOldUrl.$$route.originalPath);
});

Android java.exe finished with non-zero exit value 1

Give this mother a chance:

 dependencies {
        classpath 'com.android.tools.build:gradle:1.4.0-beta6'
    }

Don't forget to bookmark this.

How to stop a looping thread in Python?

Threaded stoppable function

Instead of subclassing threading.Thread, one can modify the function to allow stopping by a flag.

We need an object, accessible to running function, to which we set the flag to stop running.

We can use threading.currentThread() object.

import threading
import time


def doit(arg):
    t = threading.currentThread()
    while getattr(t, "do_run", True):
        print ("working on %s" % arg)
        time.sleep(1)
    print("Stopping as you wish.")


def main():
    t = threading.Thread(target=doit, args=("task",))
    t.start()
    time.sleep(5)
    t.do_run = False
    t.join()

if __name__ == "__main__":
    main()

The trick is, that the running thread can have attached additional properties. The solution builds on assumptions:

the thread has a property "do_run" with default value True
driving parent process can assign to started thread the property "do_run" to False.

Running the code, we get following output:

$ python stopthread.py                                                        
working on task
working on task
working on task
working on task
working on task
Stopping as you wish.

Pill to kill - using Event

Other alternative is to use threading.Event as function argument. It is by default False, but external process can "set it" (to True) and function can learn about it using wait(timeout) function.

We can wait with zero timeout, but we can also use it as the sleeping timer (used below).

def doit(stop_event, arg):
    while not stop_event.wait(1):
        print ("working on %s" % arg)
    print("Stopping as you wish.")


def main():
    pill2kill = threading.Event()
    t = threading.Thread(target=doit, args=(pill2kill, "task"))
    t.start()
    time.sleep(5)
    pill2kill.set()
    t.join()

Edit: I tried this in Python 3.6. stop_event.wait() blocks the event (and so the while loop) until release. It does not return a boolean value. Using stop_event.is_set() works instead.

Stopping multiple threads with one pill

Advantage of pill to kill is better seen, if we have to stop multiple threads at once, as one pill will work for all.

The doit will not change at all, only the main handles the threads a bit differently.

def main():
    pill2kill = threading.Event()
    tasks = ["task ONE", "task TWO", "task THREE"]

    def thread_gen(pill2kill, tasks):
        for task in tasks:
            t = threading.Thread(target=doit, args=(pill2kill, task))
            yield t

    threads = list(thread_gen(pill2kill, tasks))
    for thread in threads:
        thread.start()
    time.sleep(5)
    pill2kill.set()
    for thread in threads:
        thread.join()

Combining C++ and C - how does #ifdef __cplusplus work?

It's about the ABI, in order to let both C and C++ application use C interfaces without any issue.

Since C language is very easy, code generation was stable for many years for different compilers, such as GCC, Borland C\C++, MSVC etc.

While C++ becomes more and more popular, a lot things must be added into the new C++ domain (for example finally the Cfront was abandoned at AT&T because C could not cover all the features it needs). Such as template feature, and compilation-time code generation, from the past, the different compiler vendors actually did the actual implementation of C++ compiler and linker separately, the actual ABIs are not compatible at all to the C++ program at different platforms.

People might still like to implement the actual program in C++ but still keep the old C interface and ABI as usual, the header file has to declare extern "C" {}, it tells the compiler generate compatible/old/simple/easy C ABI for the interface functions if the compiler is C compiler not C++ compiler.

Determine distance from the top of a div to top of window with javascript

This can be achieved purely with JavaScript.

I see the answer I wanted to write has been answered by lynx in comments to the question.

But I'm going to write answer anyway because just like me, people sometimes forget to read the comments.

So, if you just want to get an element's distance (in Pixels) from the top of your screen window, here is what you need to do:

// Fetch the element
var el = document.getElementById("someElement");

use getBoundingClientRect()

// Use the 'top' property of 'getBoundingClientRect()' to get the distance from top
var distanceFromTop = el.getBoundingClientRect().top;

Thats it!

Hope this helps someone :)

How to delete columns in pyspark dataframe

You could either explicitly name the columns you want to keep, like so:

keep = [a.id, a.julian_date, a.user_id, b.quan_created_money, b.quan_created_cnt]

Or in a more general approach you'd include all columns except for a specific one via a list comprehension. For example like this (excluding the id column from b):

keep = [a[c] for c in a.columns] + [b[c] for c in b.columns if c != 'id']

Finally you make a selection on your join result:

d = a.join(b, a.id==b.id, 'outer').select(*keep)

How to disable Google asking permission to regularly check installed apps on my phone?

On Android 5.1 Lollipop for my device, click on the Google Settings icon > Security > Scan device for security threats .

Note that Google Settings is separated from the Settings app itself.

What is the theoretical maximum number of open TCP connections that a modern Linux box can have

If you used a raw socket (SOCK_RAW) and re-implemented TCP in userland, I think the answer is limited in this case only by the number of (local address, source port, destination address, destination port) tuples (~2^64 per local address).

It would of course take a lot of memory to keep the state of all those connections, and I think you would have to set up some iptables rules to keep the kernel TCP stack from getting upset &/or responding on your behalf.

How to install gem from GitHub source?

You can also use rdp/specific_install gem:

gem install specific_install
gem specific_install https://github.com/capistrano/drupal-deploy.git

Calculate summary statistics of columns in dataframe

Now there is the pandas_profiling package, which is a more complete alternative to df.describe().

If your pandas dataframe is df, the below will return a complete analysis including some warnings about missing values, skewness, etc. It presents histograms and correlation plots as well.

import pandas_profiling
pandas_profiling.ProfileReport(df)

See the example notebook detailing the usage.

Android - Package Name convention

Com = commercial application (just like .com, most people register their app as a com app)
First level = always the publishing entity's' name
Second level (optional) = sub-devison, group, or project name
Final level = product name

For example he android launcher (home screen) is Com.Google.android.launcher

Crop image to specified size and picture location

You would need to do something like this. I am typing this off the top of my head, so this may not be 100% correct.

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, 640, 360, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst); CGColorSpaceRelease(colorSpace);  CGContextDrawImage(context, CGRectMake(0,-160,640,360), cgImgFromAVCaptureSession);  CGImageRef image = CGBitmapContextCreateImage(context); UIImage* myCroppedImg = [UIImage imageWithCGImage:image]; CGContextRelease(context);

How to get JSON from URL in JavaScript?

//Resolved
const fetchPromise1 = fetch(url);
    fetchPromise1.then(response => {
      console.log(response);
    });


//Pending
const fetchPromise = fetch(url);
console.log(fetchPromise);

Get the difference between dates in terms of weeks, months, quarters, and years

Here's a solution:

dates <- c("14.01.2013", "26.03.2014")

# Date format:
dates2 <- strptime(dates, format = "%d.%m.%Y")

dif <- diff(as.numeric(dates2)) # difference in seconds

dif/(60 * 60 * 24 * 7) # weeks
[1] 62.28571
dif/(60 * 60 * 24 * 30) # months
[1] 14.53333
dif/(60 * 60 * 24 * 30 * 3) # quartes
[1] 4.844444
dif/(60 * 60 * 24 * 365) # years
[1] 1.194521

Chart won't update in Excel (2007)

I had this problem while generating 1000+ graphs through VBA. I generated the graphs and assigned a range to their series. However, when the sheet recalculated the graphs wouldn't update as the data ranges changed values.

Solution --> I turned WrapText off before the For...Next Loop that generates the graphs and then turned it on again after the loop.

Workbooks(x).Worksheets(x).Cells.WrapText=False

and after...

Workbooks(x).Worksheets(x).Cells.WrapText=True

This a great solution because it updates 1000+ graphs at once without looping through them all and changing something individually.

Also, I'm not really sure why this works; I suppose when WrapText changes one property of the data range it makes the graph update, although I have no documentation on this.

Get a json via Http Request in NodeJS

Just setting json option to true, the body will contain the parsed json:

request({
  url: 'http://...',
  json: true
}, function(error, response, body) {
  console.log(body);
});

Get Memory Usage in Android

Check the Debug class. http://developer.android.com/reference/android/os/Debug.html i.e. Debug.getNativeHeapAllocatedSize()

It has methods to get the used native heap, which is i.e. used by external bitmaps in your app. For the heap that the app is using internally, you can see that in the DDMS tool that comes with the Android SDK and is also available via Eclipse.

The native heap + the heap as indicated in the DDMS make up the total heap that your app is allocating.

For CPU usage I'm not sure if there's anything available via API/SDK.

Check array position for null/empty

If your array is not initialized then it contains randoms values and cannot be checked !

To initialize your array with 0 values:

int array[5] = {0};

Then you can check if the value is 0:

array[4] == 0;

When you compare to NULL, it compares to 0 as the NULL is defined as integer value 0 or 0L.

If you have an array of pointers, better use the nullptr value to check:

char* array[5] = {nullptr}; // we defined an array of char*, initialized to nullptr

if (array[4] == nullptr)
    // do something

Does Python have a package/module management system?

I don't see either MacPorts or Homebrew mentioned in other answers here, but since I do see them mentioned elsewhere on Stack Overflow for related questions, I'll add my own US$0.02 that many folks seem to consider MacPorts as not only a package manager for packages in general (as of today they list 16311 packages/ports, 2931 matching "python", albeit only for Macs), but also as a decent (maybe better) package manager for Python packages/modules:

Question

"...what is the method that Mac python developers use to manage their modules?"

Answers

SciPy

"Macs (unlike Linux) don’t come with a package manager, but there are a couple of popular package managers you can install. Macports..."

I'm still debating on whether or not to use MacPorts myself, but at the moment I'm leaning in that direction.

How to delete from a table where ID is in a list of IDs?

delete from t
where id in (1, 4, 6, 7)

How to set cache: false in jQuery.get call

Per the JQuery documentation, .get() only takes the url, data (content), dataType, and success callback as its parameters. What you're really looking to do here is modify the jqXHR object before it gets sent. With .ajax(), this is done with the beforeSend() method. But since .get() is a shortcut, it doesn't allow it.

It should be relatively easy to switch your .ajax() calls to .get() calls though. After all, .get() is just a subset of .ajax(), so you can probably use all the default values for .ajax() (except, of course, for beforeSend()).

Edit:

::Looks at Jivings' answer::

Oh yeah, forgot about the cache parameter! While beforeSend() is useful for adding other headers, the built-in cache parameter is far simpler here.

How to unzip gz file using Python

Not an exact answer because you're using xml data and there is currently no pd.read_xml() function (as of v0.23.4), but pandas (starting with v0.21.0) can uncompress the file for you! Thanks Wes!

import pandas as pd
import os
fn = '../data/file_to_load.json.gz'
print(os.path.isfile(fn))
df = pd.read_json(fn, lines=True, compression='gzip')
df.tail()

What is the difference between iterator and iterable and how to use them?

If a collection is iterable, then it can be iterated using an iterator (and consequently can be used in a for each loop.) The iterator is the actual object that will iterate through the collection.

Get and Set a Single Cookie with Node.js HTTP Server

If you're using the express library, as many node.js developers do, there is an easier way. Check the Express.js documentation page for more information.

The parsing example above works but express gives you a nice function to take care of that:

app.use(express.cookieParser());

To set a cookie:

res.cookie('cookiename', 'cookievalue', { maxAge: 900000, httpOnly: true });

To clear the cookie:

res.clearCookie('cookiename');

Clear an input field with Reactjs?

You can use input type="reset"

<form action="/action_page.php">
  text: <input type="text" name="email" /><br />  
  <input type="reset" defaultValue="Reset" />  
</form>

Disable developer mode extensions pop up in Chrome

1) Wait for the popup balloon to appear.

2) Open a new tab.

3) Close the a new tab. The popup will be gone from the original tab.

A small Chrome extension can automate these steps:

manifest.json

{
  "name": "Open and close tab",
  "description": "After Chrome starts, open and close a new tab.",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": ["tabs"],
  "background": {
    "scripts": ["background.js"], 
    "persistent": false
  }
}

background.js

// This runs when Chrome starts up
chrome.runtime.onStartup.addListener(function() {

  // Execute the inner function after a few seconds
  setTimeout(function() {

    // Open new tab
    chrome.tabs.create({url: "about:blank"});

    // Get tab ID of newly opened tab, then close the tab
    chrome.tabs.query({'currentWindow': true}, function(tabs) {
      var newTabId = tabs[1].id;
      chrome.tabs.remove(newTabId);
    });

  }, 5000);

});

With this extension installed, launch Chrome and immediately switch apps before the popup appears... a few seconds later, the popup will be gone and you won't see it when you switch back to Chrome.

How to create Password Field in Model Django

I thinks it is vary helpful way.

models.py

from django.db import models
class User(models.Model):
    user_name = models.CharField(max_length=100)
    password = models.CharField(max_length=32)

forms.py

from django import forms
from Admin.models import *
class User_forms(forms.ModelForm):
    class Meta:
        model= User
        fields=[
           'user_name',
           'password'
            ]
       widgets = {
      'password': forms.PasswordInput()
         }

Convert a tensor to numpy array in Tensorflow?

To convert back from tensor to numpy array you can simply run .eval() on the transformed tensor.

How to do a for loop in windows command line?

This may help you find what you're looking for... Batch script loop

My answer is as follows:

@echo off
:start
set /a var+=1
if %var% EQU 100 goto end
:: Code you want to run goes here
goto start

:end
echo var has reached %var%.
pause
exit

The first set of commands under the start label loops until a variable, %var% reaches 100. Once this happens it will notify you and allow you to exit. This code can be adapted to your needs by changing the 100 to 17 and putting your code or using a call command followed by the batch file's path (Shift+Right Click on file and select "Copy as Path") where the comment is placed.

How to list running screen sessions?

The command screen -list may be what you want.

See the man

How to get multiple selected values from select box in JSP?

It would seem overkill but Spring Forms handles this elegantly. That is of course if you are already using Spring MVC and you want to take advantage of the Spring Forms feature.

// jsp form
    <form:select path="friendlyNumber" items="${friendlyNumberItems}" />

    // the command class
    public class NumberCmd {
      private String[] friendlyNumber;
    }

    // in your Spring MVC controller submit method
    @RequestMapping(method=RequestMethod.POST)
    public String manageOrders(@ModelAttribute("nbrCmd") NumberCmd nbrCmd){

       String[] selectedNumbers = nbrCmd.getFriendlyNumber();

    }

GetElementByID - Multiple IDs

You can use something like this whit array and for loop.

<p id='fisrt'>??????</p>
<p id='second'>??????</p>
<p id='third'>??????</p>
<p id='forth'>??????</p>
<p id='fifth'>??????</p>
<button id="change" onclick="changeColor()">color red</button>
<script>

    var ids = ['fisrt','second','third','forth','fifth'];

    function changeColor() {
        for (var i = 0; i < ids.length; i++) {
          document.getElementById(ids[i]).style.color='red';
 }
    }
</script>

How to use Python to login to a webpage and retrieve cookies for later usage?

Here's a version using the excellent requests library:

from requests import session

payload = {
    'action': 'login',
    'username': USERNAME,
    'password': PASSWORD
}

with session() as c:
    c.post('http://example.com/login.php', data=payload)
    response = c.get('http://example.com/protected_page.php')
    print(response.headers)
    print(response.text)

Tensorflow import error: No module named 'tensorflow'

Since none of the above solve my issue, I will post my solution

WARNING: if you just installed TensorFlow using conda, you have to restart your command prompt!

Solution: restart terminal ENTIRELY and restart conda environment

Nginx: Job for nginx.service failed because the control process exited

This worked for me:

First, go to

cd /etc/nginx

and make the changes in nginx.conf and make the default port to listen from 80 to any of your choice 85 or something.

Then use this command to bind that port type for nginx to use it:

semanage port -a -t PORT_TYPE -p tcp 85

where PORT_TYPE is one of the following: http_cache_port_t, http_port_t, jboss_management_port_t, jboss_messaging_port_t, ntop_port_t, puppet_port_t.

Then run:

sudo systemctl start nginx; #sudo systemctl status nginx

[you should see active status]; #sudo systemctl enable nginx

Postgresql - unable to drop database because of some auto connections to DB

I found a solution for this problem try to run this command in terminal

ps -ef | grep postgres

kill process by this command

sudo kill -9 PID

How to set session timeout dynamically in Java web applications?

As another anwsers told, you can change in a Session Listener. But you can change it directly in your servlet, for example.

getRequest().getSession().setMaxInactiveInterval(123);

JavaScript: Collision detection

You can try jquery-collision. Full disclosure: I just wrote this and released it. I didn't find a solution, so I wrote it myself.

It allows you to do:

var hit_list = $("#ball").collision("#someobject0");

which will return all the "#someobject0"'s that overlap with "#ball".

How to make type="number" to positive numbers only

If you try to enter a negative number, the onkeyup event blocks this and if you use the arrow on the input number, the onblur event resolves that part.

_x000D_

<input type="number" _x000D_
    onkeyup="if(this.value<0)this.value=1"_x000D_
    onblur="if(this.value<0)this.value=1"_x000D_
>

_x000D_

JavaFX - create custom button with image

There are a few different ways to accomplish this, I'll outline my favourites.

Use a ToggleButton and apply a custom style to it. I suggest this because your required control is "like a toggle button" but just looks different from the default toggle button styling.

My preferred method is to define a graphic for the button in css:

.toggle-button {
  -fx-graphic: url('http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Pizza-icon.png');
}

.toggle-button:selected {
  -fx-graphic: url('http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Piece-of-cake-icon.png');
}

OR use the attached css to define a background image.

// file imagetogglebutton.css deployed in the same package as ToggleButtonImage.class
.toggle-button {
  -fx-background-image: url('http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Pizza-icon.png');
  -fx-background-repeat: no-repeat;
  -fx-background-position: center;
}

.toggle-button:selected {
  -fx-background-image: url('http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Piece-of-cake-icon.png');
}

I prefer the -fx-graphic specification over the -fx-background-* specifications as the rules for styling background images are tricky and setting the background does not automatically size the button to the image, whereas setting the graphic does.

And some sample code:

import javafx.application.Application;
import javafx.scene.*;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.StackPaneBuilder;
import javafx.stage.Stage;

public class ToggleButtonImage extends Application {
  public static void main(String[] args) throws Exception { launch(args); }
  @Override public void start(final Stage stage) throws Exception {
    final ToggleButton toggle = new ToggleButton();
    toggle.getStylesheets().add(this.getClass().getResource(
      "imagetogglebutton.css"
    ).toExternalForm());
    toggle.setMinSize(148, 148); toggle.setMaxSize(148, 148);
    stage.setScene(new Scene(
      StackPaneBuilder.create()
        .children(toggle)
        .style("-fx-padding:10; -fx-background-color: cornsilk;")
        .build()
    ));
    stage.show();
  }
}

Some advantages of doing this are:

You get the default toggle button behavior and don't have to re-implement it yourself by adding your own focus styling, mouse and key handlers etc.
If your app gets ported to different platform such as a mobile device, it will work out of the box responding to touch events rather than mouse events, etc.
Your styling is separated from your application logic so it is easier to restyle your application.

An alternate is to not use css and still use a ToggleButton, but set the image graphic in code:

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.scene.*;
import javafx.scene.control.ToggleButton;
import javafx.scene.image.*;
import javafx.scene.layout.StackPaneBuilder;
import javafx.stage.Stage;

public class ToggleButtonImageViaGraphic extends Application {
  public static void main(String[] args) throws Exception { launch(args); }
  @Override public void start(final Stage stage) throws Exception {
    final ToggleButton toggle      = new ToggleButton();
    final Image        unselected  = new Image(
      "http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Pizza-icon.png"
    );
    final Image        selected    = new Image(
      "http://icons.iconarchive.com/icons/aha-soft/desktop-buffet/128/Piece-of-cake-icon.png"
    );
    final ImageView    toggleImage = new ImageView();
    toggle.setGraphic(toggleImage);
    toggleImage.imageProperty().bind(Bindings
      .when(toggle.selectedProperty())
        .then(selected)
        .otherwise(unselected)
    );

    stage.setScene(new Scene(
      StackPaneBuilder.create()
        .children(toggle)
        .style("-fx-padding:10; -fx-background-color: cornsilk;")
        .build()
    ));
    stage.show();
  }
}

The code based approach has the advantage that you don't have to use css if you are unfamilar with it.

For best performance and ease of porting to unsigned applet and webstart sandboxes, bundle the images with your app and reference them by relative path urls rather than downloading them off the net.

ActionBarActivity is deprecated

Since the version 22.1.0, the class ActionBarActivity is deprecated. You should use AppCompatActivity.

Read here and here for more information.

iOS: present view controller programmatically

Here is how you can do it in Swift:

let vc = UIViewController()
self.presentViewController(vc, animated: true, completion: nil)

How to redirect to action from JavaScript method?

function DeleteJob() {
    if (confirm("Do you really want to delete selected job/s?"))
        window.location.href = "/{controller}/{action}/{params}";
    else
        return false;
}

What is the best way to detect a mobile device?

Great answer thanks. Small improvement to support Windows phone and Zune:

if (navigator.userAgent.match(/Android/i) ||
  navigator.userAgent.match(/webOS/i) ||
  navigator.userAgent.match(/iPhone/i) ||
  navigator.userAgent.match(/iPad/i) ||
  navigator.userAgent.match(/iPod/i) ||
  navigator.userAgent.match(/BlackBerry/) ||
  navigator.userAgent.match(/Windows Phone/i) ||
  navigator.userAgent.match(/ZuneWP7/i)
) {
  // some code
  self.location = "top.htm";
}

Convert Enumeration to a Set/List

When using guava (See doc) there is Iterators.forEnumeration. Given an Enumeration x you can do the following:

to get a immutable Set:

ImmutableSet.copyOf(Iterators.forEnumeration(x));

to get a immutable List:

ImmutableList.copyOf(Iterators.forEnumeration(x));

to get a hashSet:

Sets.newHashSet(Iterators.forEnumeration(x));

How do I add PHP code/file to HTML(.html) files?

Add this line

AddHandler application/x-httpd-php .html

to httpd.conf file for what you want to do. But remember, if you do this then your web server will be very slow, because it will be parsing even static code which will not contain php code. So the better way will be to make the file extension .phtml instead of just .html.

Loading DLLs at runtime in C#

Right now, you're creating an instance of every type defined in the assembly. You only need to create a single instance of Class1 in order to call the method:

class Program
{
    static void Main(string[] args)
    {
        var DLL = Assembly.LoadFile(@"C:\visual studio 2012\Projects\ConsoleApplication1\ConsoleApplication1\DLL.dll");

        var theType = DLL.GetType("DLL.Class1");
        var c = Activator.CreateInstance(theType);
        var method = theType.GetMethod("Output");
        method.Invoke(c, new object[]{@"Hello"});

        Console.ReadLine();
    }
}

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”.

Import Excel Data into PostgreSQL 9.3

It is possible using ogr2ogr:

C:\Program Files\PostgreSQL\12\bin\ogr2ogr.exe -f "PostgreSQL" PG:"host=someip user=someuser dbname=somedb password=somepw" C:/folder/excelfile.xlsx -nln newtablenameinpostgres -oo AUTODETECT_TYPE=YES

(Not sure if ogr2ogr is included in postgres installation or if I got it with postgis extension.)

intellij idea - Error: java: invalid source release 1.9

I was having this issue while running a SpringBoot project (Maven)

In my POM file I changed the java version from 11 to 8 and it worked:

<properties>
    <java.version>8</java.version> //The default was 11
</properties>

Make sure to Load maven changes else the change won't reflect.

Undefined function mysql_connect()

In case, you are using PHP7 already, the formerly deprecated functions mysql_* were removed entirely, so you should update your code using the PDO-functions or mysqli_* functions instead.

If that's not possible, as a workaround, I created a small PHP include file, that recreates the old mysql_* functions with mysqli_*()-functions: fix_mysql.inc.php

Is the Scala 2.8 collections library a case of "the longest suicide note in history"?

I don't know how to break it to you, but I have a PhD from Cambridge, and I'm using 2.8 just fine.

More seriously, I hardly spent any time with 2.7 (it won't inter-op with a Java library I am using) and started using Scala just over a month ago. I have some experience with Haskell (not much), but just ignored the stuff you're worried about and looked for methods that matched my experience with Java (which I use for a living).

So: I am a "new user" and I wasn't put off - the fact that it works like Java gave me enough confidence to ignore the bits I didn't understand.

(However, the reason I was looking at Scala was partly to see whether to push it at work, and I am not going to do so yet. Making the documentation less intimidating would certainly help, but what surprised me is how much it is still changing and being developed (to be fair what surprised me most was how awesome it is, but the changes came a close second). So I guess what I am saying is that I'd rather prefer the limited resources were put into getting it into a final state - I don't think they were expecting to be this popular this soon.)

Detect HTTP or HTTPS then force HTTPS in JavaScript

How about this?

if (window.location.protocol !== 'https:') {
    window.location = 'https://' + window.location.hostname + window.location.pathname + window.location.hash;
}

Ideally you'd do it on the server side, though.

how to access the command line for xampp on windows

Thank you guys for this answers. But I think the accepted answer needs more clarity, As i found difficulty in getting the solution.

We may set the environment variable as mentioned in the answer by w0rldart .

In this case(after seting envmnt var) we may run the phpFile by opening start >> CMD and typing commands like,

php.exe <path to file location>

or

php <path to file location>

example:
```
php.exe C:\xampp\htdocs\test.php
```
you can open Start >> CMD as administrator and write like

<path to php.exe in xampp's php folder> <path to file location>

example:
```
C:\xampp\php\php.exe C:\xampp\htdocs\test.php
```
or
```
C:\xampp\php\php C:\xampp\htdocs\test.php
```

Hopes this will help somebody.

How do I get multiple subplots in matplotlib?

You can also unpack the axes in the subplots call
And set whether you want to share the x and y axes between the subplots

Like this:

import matplotlib.pyplot as plt
fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(nrows=2, ncols=2, sharex=True, sharey=True)
ax1.plot(range(10), 'r')
ax2.plot(range(10), 'b')
ax3.plot(range(10), 'g')
ax4.plot(range(10), 'k')
plt.show()

Why not inherit from List<T>?

First of all, it has to do with usability. If you use inheritance, the Team class will expose behavior (methods) that are designed purely for object manipulation. For example, AsReadOnly() or CopyTo(obj) methods make no sense for the team object. Instead of the AddRange(items) method you would probably want a more descriptive AddPlayers(players) method.

If you want to use LINQ, implementing a generic interface such as ICollection<T> or IEnumerable<T> would make more sense.

As mentioned, composition is the right way to go about it. Just implement a list of players as a private variable.

How to get Selected Text from select2 when using <input>

The code below also solves otherwise

.on("change", function(e) {

  var lastValue = e.currentTarget.value;
  var lastText = e.currentTarget.textContent;

 });

Failed to run sdkmanager --list with Java 9

(WINDOWS)

If you have installed Android Studio already go to File >> Project Structure... >> SDK Location.

Go to that location + \cmdline-tools\latest\bin Copy the Path into Environment Variables

than it is OK to use the command line tool.

Generate a random number in the range 1 - 10

Actually I don't know you want to this.

try this

INSERT INTO my_table (my_column)
SELECT
    (random() * 10) + 1
;

Signtool error: No certificates were found that met all given criteria with a Windows Store App?

Please always check your certificate expiry date first because most of the certificates have an expiry date. In my case certificate has expired and I was trying to build project.

SQL Query - Change date format in query to DD/MM/YYYY

SELECT CONVERT(varchar(11),Getdate(),105)

Android ADB devices unauthorized

I got this as root when as a non-root user I was getting permissions errors trying to connect to custom recovery (Philz). so I killed adb server, copied the .android subdirectory of my user account into /root, chowned -R to root.root, and restarted adb server. I'm in!

What is Haskell used for in the real world?

I think people in this post are missing the most important point for anyone who has never used a functional programming language: expanding your mind. If you are new to functional programming then Haskell will make you think in ways you've never thought before. As a result your programming in other areas and other languages will improve. How much? Hard to quantify.

How to get the instance id from within an ec2 instance?

Simply check the var/lib/cloud/instance symlink, it should point to /var/lib/cloud/instances/{instance-id} where {instance_id} is your instance-id.

Python json.loads shows ValueError: Extra data

Well , it might help someone. i just got the same error while my json file is like this

{"id":"1101010","city_id":"1101","name":"TEUPAH SELATAN"}
{"id":"1101020","city_id":"1101","name":"SIMEULUE TIMUR"}

and i found it malformed, so i changed it into somekind of

{
  "datas":[
    {"id":"1101010","city_id":"1101","name":"TEUPAH SELATAN"},
    {"id":"1101020","city_id":"1101","name":"SIMEULUE TIMUR"}
  ]
}

Archive the artifacts in Jenkins

An artifact can be any result of your build process. The important thing is that it doesn't matter on which client it was built it will be tranfered from the workspace back to the master (server) and stored there with a link to the build. The advantage is that it is versionized this way, you only have to setup backup on your master and that all artifacts are accesible via the web interface even if all build clients are offline.

It is possible to define a regular expression as the artifact name. In my case I zipped all the files I wanted to store in one file with a constant name during the build.

How to pass integer from one Activity to another?

Their are two methods you can use to pass an integer. One is as shown below.

A.class

Intent myIntent = new Intent(A.this, B.class);
myIntent.putExtra("intVariableName", intValue);
startActivity(myIntent);

B.class

Intent intent = getIntent();
int intValue = intent.getIntExtra("intVariableName", 0);

The other method converts the integer to a string and uses the following code.

A.class

Intent intent = new Intent(A.this, B.class);
Bundle extras = new Bundle();
extras.putString("StringVariableName", intValue + "");
intent.putExtras(extras);
startActivity(intent);

The code above will pass your integer value as a string to class B. On class B, get the string value and convert again as an integer as shown below.

B.class

   Bundle extras = getIntent().getExtras();
   String stringVariableName = extras.getString("StringVariableName");
   int intVariableName = Integer.parseInt(stringVariableName);

Excel VBA Open workbook, perform actions, save as, close

After discussion posting updated answer:

Option Explicit
Sub test()

    Dim wk As String, yr As String
    Dim fname As String, fpath As String
    Dim owb As Workbook

    With Application
        .DisplayAlerts = False
        .ScreenUpdating = False
        .EnableEvents = False
    End With

    wk = ComboBox1.Value
    yr = ComboBox2.Value
    fname = yr & "W" & wk
    fpath = "C:\Documents and Settings\jammil\Desktop\AutoFinance\ProjectControl\Data"

    On Error GoTo ErrorHandler
    Set owb = Application.Workbooks.Open(fpath & "\" & fname)

    'Do Some Stuff

    With owb
        .SaveAs fpath & Format(Date, "yyyymm") & "DB" & ".xlsx", 51
        .Close
    End With

    With Application
        .DisplayAlerts = True
        .ScreenUpdating = True
        .EnableEvents = True
    End With

Exit Sub
ErrorHandler: If MsgBox("This File Does Not Exist!", vbRetryCancel) = vbCancel Then

Else: Call Clear

End Sub

Error Handling:

You could try something like this to catch a specific error:

    On Error Resume Next
    Set owb = Application.Workbooks.Open(fpath & "\" & fname)
    If Err.Number = 1004 Then
    GoTo FileNotFound
    Else
    End If

    ...
    Exit Sub
    FileNotFound: If MsgBox("This File Does Not Exist!", vbRetryCancel) = vbCancel Then

    Else: Call Clear

How do I get a value of a <span> using jQuery?

VERY IMPORTANT Additional info on difference between .text() and .html():

If your selector selects more than one item, e.g you have two spans like so <span class="foo">bar1</span> <span class="foo">bar2</span> ,

then

$('.foo').text(); appends the two texts and give you that; whereas

$('.foo').html(); gives you only one of those.

How do I show the number keyboard on an EditText in android?

More input types and details found here on google website

How do I increase modal width in Angular UI Bootstrap?

If you want to just go with the default large size you can add 'modal-lg':

var modal = $modal.open({
          templateUrl: "/partials/welcome",
          controller: "welcomeCtrl",
          backdrop: "static",
          scope: $scope,
          windowClass: 'modal-lg'
});

nginx error connect to php5-fpm.sock failed (13: Permission denied)

The following simple fix worked for me, bypassing possible permissions issues with the socket.

In your nginx config, set fastcgi_pass to:

fastcgi_pass   127.0.0.1:9000;

Instead of

fastcgi_pass   /var/run/php5-fpm.sock;

This must match the listen = parameter in /etc/php5/fpm/pool.d/www.conf, so also set this to:

listen = 127.0.0.1:9000;

Then restart php5-fpm and nginx

service php5-fpm restart

And

service nginx restart

For more info, see: https://wildlyinaccurate.com/solving-502-bad-gateway-with-nginx-php-fpm/

How to make parent wait for all child processes to finish?

Use waitpid() like this:

pid_t childPid;  // the child process that the execution will soon run inside of. 
childPid = fork();

if(childPid == 0)  // fork succeeded 
{   
   // Do something   
   exit(0); 
}

else if(childPid < 0)  // fork failed 
{    
   // log the error
}

else  // Main (parent) process after fork succeeds 
{    
    int returnStatus;    
    waitpid(childPid, &returnStatus, 0);  // Parent process waits here for child to terminate.

    if (returnStatus == 0)  // Verify child process terminated without error.  
    {
       printf("The child process terminated normally.");    
    }

    if (returnStatus == 1)      
    {
       printf("The child process terminated with an error!.");    
    }
}

How to center horizontally div inside parent div

Just out of interest, if you want to center two or more divs (so they're side by side in the center), then here's how to do it:

<div style="text-align:center;">
    <div style="border:1px solid #000; display:inline-block;">Div 1</div>
    <div style="border:1px solid red; display:inline-block;">Div 2</div>
</div>

Run php function on button click

I tried the code of William, Thanks brother.

but it's not working as a simple button I have to add form with method="post". Also I have to write submit instead of button.

here is my code below..

<form method="post">
    <input type="submit" name="test" id="test" value="RUN" /><br/>
</form>

<?php

function testfun()
{
   echo "Your test function on button click is working";
}

if(array_key_exists('test',$_POST)){
   testfun();
}

?>

Add resources, config files to your jar using gradle

Be aware that the path under src/main/resources must match the package path of your .class files wishing to access the resource. See my answer here.

How to get only the last part of a path in Python?

I was searching for a solution to get the last foldername where the file is located, I just used split two times, to get the right part. It's not the question but google transfered me here.

pathname = "/folderA/folderB/folderC/folderD/filename.py"
head, tail = os.path.split(os.path.split(pathname)[0])
print(head + "   "  + tail)

Troubleshooting BadImageFormatException

You can also get this exception when your application target .NET Framework 4.5 (for example) and you have the following app.config :

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <startup>
    <supportedRuntime version="v2.0.50727" />
    <supportedRuntime version="v4.0" />
  </startup>
</configuration>

When trying to launch the debug of the application you will get the BadImageFormatException.

Removing the line declaring the v2.0 version will clear the error.

I had this issue recently when I tried to change the target platform from an old .NET 2.0 project to .NET 4.5.

Big-oh vs big-theta

Bonus: why do people seemingly always use big-oh when talking informally?

Because in big-oh, this loop:

for i = 1 to n do
    something in O(1) that doesn't change n and i and isn't a jump

is O(n), O(n^2), O(n^3), O(n^1423424). big-oh is just an upper bound, which makes it easier to calculate because you don't have to find a tight bound.

The above loop is only big-theta(n) however.

What's the complexity of the sieve of eratosthenes? If you said O(n log n) you wouldn't be wrong, but it wouldn't be the best answer either. If you said big-theta(n log n), you would be wrong.

How to pass parameters on onChange of html select

jQuery solution

How do I get the text value of a selected option

Select elements typically have two values that you want to access.
First there's the value to be sent to the server, which is easy:

$( "#myselect" ).val();
// => 1

The second is the text value of the select.
For example, using the following select box:

<select id="myselect">
  <option value="1">Mr</option>
  <option value="2">Mrs</option>
  <option value="3">Ms</option>
  <option value="4">Dr</option>
  <option value="5">Prof</option>
</select>

If you wanted to get the string "Mr" if the first option was selected (instead of just "1") you would do that in the following way:

$( "#myselect option:selected" ).text();
// => "Mr"

Xcode 4 - "Archive" is greyed out?

As the other answers state, you need to select an active scheme to something that is not a simulator, i.e. a device that's connected to your mac.

If you have no device connected to the mac then selecting "Generic IOS Device" works also.

Equivalent of SQL ISNULL in LINQ?

I often have this problem with sequences (as opposed to discrete values). If I have a sequence of ints, and I want to SUM them, when the list is empty I'll receive the error "InvalidOperationException: The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type.".

I find I can solve this by casting the sequence to a nullable type. SUM and the other aggregate operators don't throw this error if a sequence of nullable types is empty.

So for example something like this

MySum = MyTable.Where(x => x.SomeCondtion).Sum(x => x.AnIntegerValue);

becomes

MySum = MyTable.Where(x => x.SomeCondtion).Sum(x => (int?) x.AnIntegerValue);

The second one will return 0 when no rows match the where clause. (the first one throws an exception when no rows match).

PHP: How can I determine if a variable has a value that is between two distinct constant values?

A random value?

If you want a random value, try

<?php
$value = mt_rand($min, $max);

mt_rand() will run a bit more random if you are using many random numbers in a row, or if you might ever execute the script more than once a second. In general, you should use mt_rand() over rand() if there is any doubt.

How to alter SQL in "Edit Top 200 Rows" in SSMS 2008

The default to open/add rows to a table is Edit Top 200 Rows. If you have more than 200 rows, like me now, then you need to change the default setting. Here's what I did to change the edit default to 300:

Go to Tools in top nav
Select options, then SQL Service Object Explorer (on left)
On right side of panel, click into the field that contains 200 and change to 300 (or whatever number you wish)
Click OK and voila, you're all set!

unsigned APK can not be installed

I did not know that even with the "Allow Installation of non-Marked application", I still needed to sign the application.

I self-signed my application, following this link self-sign and release application, It only took 5 minutes, then I emailed the signed-APK file to myself and downloaded it to SD-card and then installed it without any problem.

Tricks to manage the available memory in an R session

If you are working on Linux and want to use several processes and only have to do read operations on one or more large objects use makeForkCluster instead of a makePSOCKcluster. This also saves you the time sending the large object to the other processes.

Why are #ifndef and #define used in C++ header files?

They are called ifdef or include guards.

If writing a small program it might seems that it is not needed, but as the project grows you could intentionally or unintentionally include one file many times, which can result in compilation warning like variable already declared.

#ifndef checks whether HEADERFILE_H is not declared.
#define will declare HEADERFILE_H once #ifndef generates true.
#endif is to know the scope of #ifndef i.e end of #ifndef

If it is not declared which means #ifndef generates true then only the part between #ifndef and #endif executed otherwise not. This will prevent from again declaring the identifiers, enums, structure, etc...

Requested registry access is not allowed

You Could Do The same as abatishchev but without the UAC

<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
<assemblyIdentity version="1.0.0.0" name="MyApplication.app"/>
 <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
   <security>
    <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
    </requestedPrivileges>
    </security>
  </trustInfo>
</assembly>

Select datatype of the field in postgres

If you like 'Mike Sherrill' solution but don't want to use psql, I used this query to get the missing information:

select column_name,
case 
    when domain_name is not null then domain_name
    when data_type='character varying' THEN 'varchar('||character_maximum_length||')'
    when data_type='numeric' THEN 'numeric('||numeric_precision||','||numeric_scale||')'
    else data_type
end as myType
from information_schema.columns
where table_name='test'

with result:

column_name |     myType
-------------+-------------------
 test_id     | test_domain
 test_vc     | varchar(15)
 test_n      | numeric(15,3)
 big_n       | bigint
 ip_addr     | inet

How can I read an input string of unknown length?

If I may suggest a safer approach:

Declare a buffer big enough to hold the string:

char user_input[255];

Get the user input in a safe way:

fgets(user_input, 255, stdin);

A safe way to get the input, the first argument being a pointer to a buffer where the input will be stored, the second the maximum input the function should read and the third is a pointer to the standard input - i.e. where the user input comes from.

Safety in particular comes from the second argument limiting how much will be read which prevents buffer overruns. Also, fgets takes care of null-terminating the processed string.

More info on that function here.

EDIT: If you need to do any formatting (e.g. convert a string to a number), you can use atoi once you have the input.

Best way to handle list.index(might-not-exist) in python?

thing_index = thing_list.index(elem) if elem in thing_list else -1

One line. Simple. No exceptions.

HTML button to NOT submit form

It's recommended not to use the <Button> tag. Use the <Input type='Button' onclick='return false;'> tag instead. (Using the "return false" should indeed not send the form.)

Some reference material

Chrome dev tools fails to show response even the content returned has header Content-Type:text/html; charset=UTF-8

I think this only happens when you have 'Preserve log' checked and you are trying to view the response data of a previous request after you have navigated away.

For example, I viewed the Response to loading this Stack Overflow question. You can see it.

The second time, I reloaded this page but didn't look at the Headers or Response. I navigated to a different website. Now when I look at the response, it shows 'Failed to load response data'.

This is a known issue, that's been around for a while, and debated a lot. However, there is a workaround, in which you pause on onunload, so you can view the response before it navigates away, and thereby doesn't lose the data upon navigating away.

window.onunload = function() { debugger; }

Should I check in folder "node_modules" to Git when creating a Node.js app on Heroku?

You should not include folder node_modules in your .gitignore file (or rather you should include folder node_modules in your source deployed to Heroku).

If folder node_modules:

exists then npm install will use those vendored libraries and will rebuild any binary dependencies with npm rebuild.
doesn't exist then npm install will have to fetch all dependencies itself which adds time to the slug compile step.

See the Node.js buildpack source for these exact steps.

However, the original error looks to be an incompatibility between the versions of npm and Node.js. It is a good idea to always explicitly set the engines section of your packages.json file according to this guide to avoid these types of situations:

{
  "name": "myapp",
  "version": "0.0.1",
  "engines": {
    "node": "0.8.x",
    "npm":  "1.1.x"
  }
}

This will ensure development/production parity and reduce the likelihood of such situations in the future.

Get last 30 day records from today date in SQL Server

Below query is appropriate for the last 30 days records

Here, I have used a review table and review_date is a column from the review table

SELECT * FROM reviews WHERE DATE(review_date) >= DATE(NOW()) - INTERVAL 30 DAY

How best to read a File into List<string>

A little update to Evan Mulawski answer to make it shorter

List<string> allLinesText = File.ReadAllLines(fileName).ToList()

Why can't DateTime.Parse parse UTC date

It can't parse that string because "UTC" is not a valid time zone designator.

UTC time is denoted by adding a 'Z' to the end of the time string, so your parsing code should look like this:

DateTime.Parse("Tue, 1 Jan 2008 00:00:00Z");

From the Wikipedia article on ISO 8601

If the time is in UTC, add a 'Z' directly after the time without a space. 'Z' is the zone designator for the zero UTC offset. "09:30 UTC" is therefore represented as "09:30Z" or "0930Z". "14:45:15 UTC" would be "14:45:15Z" or "144515Z".

UTC time is also known as 'Zulu' time, since 'Zulu' is the NATO phonetic alphabet word for 'Z'.

How to Serialize a list in java?

As pointed out already, most standard implementations of List are serializable. However you have to ensure that the objects referenced/contained within the list are also serializable.

Initializing multiple variables to the same value in Java

You can declare multiple variables, and initialize multiple variables, but not both at the same time:

 String one,two,three;
 one = two = three = "";

However, this kind of thing (especially the multiple assignments) would be frowned upon by most Java developers, who would consider it the opposite of "visually simple".

How can I apply styles to multiple classes at once?

Don’t Repeat Your CSS

 a.abc, a.xyz{
    margin-left:20px;
 }

 a{
    margin-left:20px;
 }

Get all inherited classes of an abstract class

This is such a common problem, especially in GUI applications, that I'm surprised there isn't a BCL class to do this out of the box. Here's how I do it.

public static class ReflectiveEnumerator
{
    static ReflectiveEnumerator() { }

    public static IEnumerable<T> GetEnumerableOfType<T>(params object[] constructorArgs) where T : class, IComparable<T>
    {
        List<T> objects = new List<T>();
        foreach (Type type in 
            Assembly.GetAssembly(typeof(T)).GetTypes()
            .Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(T))))
        {
            objects.Add((T)Activator.CreateInstance(type, constructorArgs));
        }
        objects.Sort();
        return objects;
    }
}

A few notes:

Don't worry about the "cost" of this operation - you're only going to be doing it once (hopefully) and even then it's not as slow as you'd think.
You need to use Assembly.GetAssembly(typeof(T)) because your base class might be in a different assembly.
You need to use the criteria type.IsClass and !type.IsAbstract because it'll throw an exception if you try to instantiate an interface or abstract class.
I like forcing the enumerated classes to implement IComparable so that they can be sorted.
Your child classes must have identical constructor signatures, otherwise it'll throw an exception. This typically isn't a problem for me.

DynamoDB vs MongoDB NoSQL

With 500k documents, there is no reason to scale whatsoever. A typical laptop with an SSD and 8GB of ram can easily do 10s of millions of records, so if you are trying to pick because of scaling your choice doesn't really matter. I would suggest you pick what you like the most, and perhaps where you can find the most online support with.

What's the difference between Perl's backticks, system, and exec?

What's the difference between Perl's backticks (`), system, and exec?

exec -> exec "command"; ,
system -> system("command"); and 
backticks -> print `command`;

`exec`

exec executes a command and never resumes the Perl script. It's to a script like a return statement is to a function.

If the command is not found, exec returns false. It never returns true, because if the command is found, it never returns at all. There is also no point in returning STDOUT, STDERR or exit status of the command. You can find documentation about it in perlfunc, because it is a function.

E.g.:

#!/usr/bin/perl
print "Need to start exec command";
my $data2 = exec('ls');
print "Now END exec command";
print "Hello $data2\n\n";

In above code, there are three print statements, but due to exec leaving the script, only the first print statement is executed. Also, the exec command output is not being assigned to any variable.

Here, only you're only getting the output of the first print statement and of executing the ls command on standard out.

`system`

system executes a command and your Perl script is resumed after the command has finished. The return value is the exit status of the command. You can find documentation about it in perlfunc.

E.g.:

#!/usr/bin/perl
print "Need to start system command";
my $data2 = system('ls');
print "Now END system command";
print "Hello $data2\n\n";

In above code, there are three print statements. As the script is resumed after the system command, all three print statements are executed.

Also, the result of running system is assigned to data2, but the assigned value is 0 (the exit code from ls).

Here, you're getting the output of the first print statement, then that of the ls command, followed by the outputs of the final two print statements on standard out.

backticks (`)

Like system, enclosing a command in backticks executes that command and your Perl script is resumed after the command has finished. In contrast to system, the return value is STDOUT of the command. qx// is equivalent to backticks. You can find documentation about it in perlop, because unlike system and exec, it is an operator.

E.g.:

#!/usr/bin/perl
print "Need to start backticks command";
my $data2 = `ls`;
print "Now END system command";
print "Hello $data2\n\n";

In above code, there are three print statements and all three are being executed. The output of ls is not going to standard out directly, but assigned to the variable data2 and then printed by the final print statement.

package R does not exist

Sample: My package is com.example.mypc.f01, to fix error you add line below to Activity:

import com.example.mypc.f01.R;

Click a button programmatically

The best practice for this sort of situation is to create a method that hold all the logics, and call the method in both events, rather than calling an event from another event;

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        LogicMethod()

End Sub

Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        LogicMethod()

End Sub

Private Sub LogicMethod()

     // All your logic goes here

End Sub

In case you need the properties of the EventArgs (e), you can easily pass it through parameters in your method, that will avoid errors if ever the sender is of different types. But that won't be a problem in your case, as both senders are of type Button.

UITableView with fixed section headers

The headers only remain fixed when the UITableViewStyle property of the table is set to UITableViewStylePlain. If you have it set to UITableViewStyleGrouped, the headers will scroll up with the cells.

How to determine the current iPhone/device model?

For both device as well as simulators, Create a new swift file with name UIDevice.swift

Add the below code

import UIKit


public extension UIDevice {

var modelName: String {
    #if (arch(i386) || arch(x86_64)) && os(iOS)
        let DEVICE_IS_SIMULATOR = true
    #else
        let DEVICE_IS_SIMULATOR = false
    #endif

    var machineString : String = ""

    if DEVICE_IS_SIMULATOR == true
    {

        if let dir = NSProcessInfo().environment["SIMULATOR_MODEL_IDENTIFIER"] {
            machineString = dir
        }
    }
    else {
        var systemInfo = utsname()
        uname(&systemInfo)
        let machineMirror = Mirror(reflecting: systemInfo.machine)
        machineString = machineMirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8 where value != 0 else { return identifier }
            return identifier + String(UnicodeScalar(UInt8(value)))
        }
    }
    switch machineString {
    case "iPod5,1":                                 return "iPod Touch 5"
    case "iPod7,1":                                 return "iPod Touch 6"
    case "iPhone3,1", "iPhone3,2", "iPhone3,3":     return "iPhone 4"
    case "iPhone4,1":                               return "iPhone 4s"
    case "iPhone5,1", "iPhone5,2":                  return "iPhone 5"
    case "iPhone5,3", "iPhone5,4":                  return "iPhone 5c"
    case "iPhone6,1", "iPhone6,2":                  return "iPhone 5s"
    case "iPhone7,2":                               return "iPhone 6"
    case "iPhone7,1":                               return "iPhone 6 Plus"
    case "iPhone8,1":                               return "iPhone 6s"
    case "iPhone8,2":                               return "iPhone 6s Plus"
    case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
    case "iPad3,1", "iPad3,2", "iPad3,3":           return "iPad 3"
    case "iPad3,4", "iPad3,5", "iPad3,6":           return "iPad 4"
    case "iPad4,1", "iPad4,2", "iPad4,3":           return "iPad Air"
    case "iPad5,3", "iPad5,4":                      return "iPad Air 2"
    case "iPad2,5", "iPad2,6", "iPad2,7":           return "iPad Mini"
    case "iPad4,4", "iPad4,5", "iPad4,6":           return "iPad Mini 2"
    case "iPad4,7", "iPad4,8", "iPad4,9":           return "iPad Mini 3"
    case "iPad5,1", "iPad5,2":                      return "iPad Mini 4"
    case "iPad6,7", "iPad6,8":                      return "iPad Pro"
    case "AppleTV5,3":                              return "Apple TV"
    default:                                        return machineString
    }
}
}

Then in your viewcontroller,

 let deviceType = UIDevice.currentDevice().modelName

    if deviceType.lowercaseString.rangeOfString("iphone 4") != nil {
       print("iPhone 4 or iphone 4s")
    }
    else if deviceType.lowercaseString.rangeOfString("iphone 5") != nil {
        print("iPhone 5 or iphone 5s or iphone 5c")
    }
   else if deviceType.lowercaseString.rangeOfString("iphone 6") != nil {
        print("iPhone 6 Series")
    }

ng-if, not equal to?

Try below solution

ng-if="details.Payment[0].Status != '0'"

Use below condition(! prefix with true condition) instead of above

ng-if="!details.Payment[0].Status == '0'"

Python Pandas User Warning: Sorting because non-concatenation axis is not aligned

jezrael's answer is good, but did not answer a question I had: Will getting the "sort" flag wrong mess up my data in any way? The answer is apparently "no", you are fine either way.

from pandas import DataFrame, concat

a = DataFrame([{'a':1,      'c':2,'d':3      }])
b = DataFrame([{'a':4,'b':5,      'd':6,'e':7}])

>>> concat([a,b],sort=False)
   a    c  d    b    e
0  1  2.0  3  NaN  NaN
0  4  NaN  6  5.0  7.0

>>> concat([a,b],sort=True)
   a    b    c  d    e
0  1  NaN  2.0  3  NaN
0  4  5.0  NaN  6  7.0

Git keeps asking me for my ssh key passphrase

I would try the following:

Start GitBash
Edit your ~/.bashrc file
Add the following lines to the file

SSH_ENV=$HOME/.ssh/environment

# start the ssh-agent
function start_agent {
    echo "Initializing new SSH agent..."
    # spawn ssh-agent
    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > ${SSH_ENV}
    echo succeeded
    chmod 600 ${SSH_ENV}
    . ${SSH_ENV} > /dev/null
    /usr/bin/ssh-add
}

if [ -f "${SSH_ENV}" ]; then
     . ${SSH_ENV} > /dev/null
     ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
        start_agent;
    }
else
    start_agent;
fi

Save and close the file
Close GitBash
Reopen GitBash
Enter your passphrase

How do I check out a remote Git branch?

I tried the above solution, but it didn't work. Try this, it works:

git fetch origin 'remote_branch':'local_branch_name'

This will fetch the remote branch and create a new local branch (if not exists already) with name local_branch_name and track the remote one in it.

Add the loading screen in starting of the android application

You can use splash screen in your first loading Activity like this:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);

        Thread welcomeThread = new Thread() {

            @Override
            public void run() {
                try {
                    super.run();
                    sleep(10000);  //Delay of 10 seconds
                } catch (Exception e) {

                } finally {

                    Intent i = new Intent(SplashActivity.this,
                            MainActivity.class);
                    startActivity(i);
                    finish();
                }
            }
        };
        welcomeThread.start();
    }

Hope this code helps you.

MySQL foreach alternative for procedure

This can be done with MySQL, although it's highly unintuitive:

CREATE PROCEDURE p25 (OUT return_val INT)
BEGIN
  DECLARE a,b INT;
  DECLARE cur_1 CURSOR FOR SELECT s1 FROM t;
  DECLARE CONTINUE HANDLER FOR NOT FOUND
  SET b = 1;
  OPEN cur_1;
  REPEAT
    FETCH cur_1 INTO a;
    UNTIL b = 1
  END REPEAT;
  CLOSE cur_1;
  SET return_val = a;
END;//

Check out this guide: mysql-storedprocedures.pdf

iPhone hide Navigation Bar only on first page

The nicest solution I have found is to do the following in the first view controller.

Objective-C

- (void)viewWillAppear:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    [super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:NO animated:animated];
    [super viewWillDisappear:animated];
}

Swift

override func viewWillAppear(_ animated: Bool) {
    self.navigationController?.setNavigationBarHidden(true, animated: animated)
    super.viewWillAppear(animated)
}

override func viewWillDisappear(_ animated: Bool) {
    self.navigationController?.setNavigationBarHidden(false, animated: animated)
    super.viewWillDisappear(animated)
}

This will cause the navigation bar to animate in from the left (together with the next view) when you push the next UIViewController on the stack, and animate away to the left (together with the old view), when you press the back button on the UINavigationBar.

Please note also that these are not delegate methods, you are overriding UIViewController's implementation of these methods, and according to the documentation you must call the super's implementation somewhere in your implementation.

Notification Icon with the new Firebase Cloud Messaging system

I'm triggering my notifications from FCM console and through HTTP/JSON ... with the same result.

I can handle the title, full message, but the icon is always a default white circle:

Notification screenshot

Instead of my custom icon in the code (setSmallIcon or setSmallIcon) or default icon from the app:

 Intent intent = new Intent(this, MainActivity.class);
    // use System.currentTimeMillis() to have a unique ID for the pending intent
    PendingIntent pIntent = PendingIntent.getActivity(this, (int) System.currentTimeMillis(), intent, 0);

    if (Build.VERSION.SDK_INT < 16) {
        Notification n  = new Notification.Builder(this)
                .setContentTitle(messageTitle)
                .setContentText(messageBody)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(pIntent)
                .setAutoCancel(true).getNotification();
        NotificationManager notificationManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //notificationManager.notify(0, n);
        notificationManager.notify(id, n);
    } else {
        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);

        Notification n  = new Notification.Builder(this)
                .setContentTitle(messageTitle)
                .setContentText(messageBody)
                .setSmallIcon(R.drawable.ic_stat_ic_notification)
                .setLargeIcon(bm)
                .setContentIntent(pIntent)
                .setAutoCancel(true).build();

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //notificationManager.notify(0, n);
        notificationManager.notify(id, n);
    }

Performing user authentication in Java EE / JSF using j_security_check

The issue HttpServletRequest.login does not set authentication state in session has been fixed in 3.0.1. Update glassfish to the latest version and you're done.

Updating is quite straightforward:

glassfishv3/bin/pkg set-authority -P dev.glassfish.org
glassfishv3/bin/pkg image-update

"Insufficient Storage Available" even there is lot of free space in device memory

When it comes to areal device, the behavior of devices seem different to a different group of devices.

Some of the strange collection of the opinion I heard form different people is:

Restart your device after unplugging
Remove some apps from device and free at-least 100 MB
Try to install your app from the command line, ./adb install ~Application_path
Move your application to SD card storage or make it default in SD card in the Android manifest file, android:installLocation="preferExternal"
You got a lot of memory acquiring stuff in the Raw folder which installs a copy in phone memory while instating an APK file and the device doesn't have enough memory to load them
Root your device and install some good ROM which help to letting the device know about its remaining memory.

I hope one of them is relevant to you! ;)

Sun JSTL taglib declaration fails with "Can not find the tag library descriptor"

I was getting the same problem on enter image description here Spring Tool Suite 3.2 and changed the version of jstl to 1.2 (from 1.1.2) manually when adding it to the dependency list, and the error got disappeared.

XPath contains(text(),'some string') doesn't work when used with node with more than one Text subnode

[contains(text(),'')] only returns true or false. It won't return any element results.

Mouseover or hover vue.js

I came up with the same problem, and I work it out !

_x000D_

        <img :src='book.images.small' v-on:mouseenter="hoverImg">

_x000D_

JSON array javascript

Vue.js get selected option on @change

The changed value will be in event.target.value

_x000D_

const app = new Vue({_x000D_
  el: "#app",_x000D_
  data: function() {_x000D_
    return {_x000D_
      message: "Vue"_x000D_
    }_x000D_
  },_x000D_
  methods: {_x000D_
    onChange(event) {_x000D_
      console.log(event.target.value);_x000D_
    }_x000D_
  }_x000D_
})

_x000D_

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>_x000D_
<div id="app">_x000D_
  <select name="LeaveType" @change="onChange" class="form-control">_x000D_
   <option value="1">Annual Leave/ Off-Day</option>_x000D_
   <option value="2">On Demand Leave</option>_x000D_
</select>_x000D_
</div>

_x000D_

How to change an element's title attribute using jQuery

As an addition to @C??? answer, make sure the title of the tooltip has not already been set manually in the HTML element. In my case, the span class for the tooltip already had a fixed tittle text, because of this my JQuery function $('[data-toggle="tooltip"]').prop('title', 'your new title'); did not work.

When I removed the title attribute in the HTML span class, the jQuery was working.

So:

<span class="showTooltip" data-target="#showTooltip" data-id="showTooltip">
      <span id="MyTooltip" class="fas fa-info-circle" data-toggle="tooltip" data-placement="top" title="this is my pre-set title text"></span>
</span>

Should becode:

<span class="showTooltip" data-target="#showTooltip" data-id="showTooltip">
      <span id="MyTooltip" class="fas fa-info-circle" data-toggle="tooltip" data-placement="top"></span>
</span>

Unicode character for "X" cancel / close?

What about using the ×-mark (the multiplication symbol), × in HTML, for that?

"x" (letter) should not be used to represent anything else other than the letter X.

How exactly does binary code get converted into letters?

To read binary ASCII characters with great speed using only your head:

Letters start with leading bits 01. Bit 3 is on (1) for lower case, off (0) for capitals. Scan the following bits 4–8 for the first that is on, and select the starting letter from the same index in this string: “PHDBA” (think P.H.D., Bachelors in Arts). E.g. 1xxxx = P, 01xxx = H, etc. Then convert the remaining bits to an integer value (e.g. 010 = 2), and count that many letters up from your starting letter. E.g. 01001010 => H+2 = J.

Getting windbg without the whole WDK?

The saga continues with the Windows 10 version. I had to install Win Debug Tools on clean Windows 10 OS with Visual Studio 2015.

To make a long story short, just follow the instructions in the link provided by David Black. After downloading the files, instead of running the SDK installer, browse to the installers directory and execute the msi files directly.

I wonder how many man hours have been lost through the last decade because of MS sloppiness in regards to WDK/SDK installation?

TypeScript enum to object array

Easy Solution. You can use the following function to convert your Enum to an array of objects.

 buildGoalProgressMeasurementsArray(): Object[] {

    return Object.keys(GoalProgressMeasurements)
              .map(key => ({ id: GoalProgressMeasurements[key], name: key }))
 }

If you needed to strip that underscore off, we could use regex as follows:

buildGoalProgressMeasurementsArray(): Object[] {

    return Object.keys(GoalProgressMeasurements)
              .map(key => ({ id: GoalProgressMeasurements[key], name: key.replace(/_/g, ' ') }))
 }

The order of keys in dictionaries

Just sort the list when you want to use it.

l = sorted(d.keys())

Shall we always use [unowned self] inside closure in Swift

Here is brilliant quotes from Apple Developer Forums described delicious details:

`unowned` vs `unowned(safe)` vs `unowned(unsafe)`

unowned(safe) is a non-owning reference that asserts on access that the object is still alive. It's sort of like a weak optional reference that's implicitly unwrapped with x! every time it's accessed. unowned(unsafe) is like __unsafe_unretained in ARC—it's a non-owning reference, but there's no runtime check that the object is still alive on access, so dangling references will reach into garbage memory. unowned is always a synonym for unowned(safe) currently, but the intent is that it will be optimized to unowned(unsafe) in -Ofast builds when runtime checks are disabled.

`unowned` vs `weak`

unowned actually uses a much simpler implementation than weak. Native Swift objects carry two reference counts, and unowned references bump the unowned reference count instead of the strong reference count. The object is deinitialized when its strong reference count reaches zero, but it isn't actually deallocated until the unowned reference count also hits zero. This causes the memory to be held onto slightly longer when there are unowned references, but that isn't usually a problem when unowned is used because the related objects should have near-equal lifetimes anyway, and it's much simpler and lower-overhead than the side-table based implementation used for zeroing weak references.

Update: In modern Swift weak internally uses the same mechanism as unowned does. So this comparison is incorrect because it compares Objective-C weak with Swift unonwed.

Reasons

What is the purpose of keeping the memory alive after owning references reach 0? What happens if code attempts to do something with the object using an unowned reference after it is deinitialized?

The memory is kept alive so that its retain counts are still available. This way, when someone attempts to retain a strong reference to the unowned object, the runtime can check that the strong reference count is greater than zero in order to ensure that it is safe to retain the object.

What happens to owning or unowned references held by the object? Is their lifetime decoupled from the object when it is deinitialized or is their memory also retained until the object is deallocated after the last unowned reference is released?

All resources owned by the object are released as soon as the object's last strong reference is released, and its deinit is run. Unowned references only keep the memory alive—aside from the header with the reference counts, its contents is junk.

Excited, huh?

Change image size with JavaScript

//  This one has print statement so you can see the result at every stage if     you would like.  They are not needed

function crop(image, width, height)
{
    image.width = width;
    image.height = height;
    //print ("in function", image, image.getWidth(), image.getHeight());
    return image;
}

var image = new SimpleImage("name of your image here");
//print ("original", image, image.getWidth(), image.getHeight());
//crop(image,200,300);
print ("final", image, image.getWidth(), image.getHeight());

Dictionary returning a default value if the key does not exist

I created a DefaultableDictionary to do exactly what you are asking for!

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace DefaultableDictionary {
    public class DefaultableDictionary<TKey, TValue> : IDictionary<TKey, TValue> {
        private readonly IDictionary<TKey, TValue> dictionary;
        private readonly TValue defaultValue;

        public DefaultableDictionary(IDictionary<TKey, TValue> dictionary, TValue defaultValue) {
            this.dictionary = dictionary;
            this.defaultValue = defaultValue;
        }

        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() {
            return dictionary.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator();
        }

        public void Add(KeyValuePair<TKey, TValue> item) {
            dictionary.Add(item);
        }

        public void Clear() {
            dictionary.Clear();
        }

        public bool Contains(KeyValuePair<TKey, TValue> item) {
            return dictionary.Contains(item);
        }

        public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) {
            dictionary.CopyTo(array, arrayIndex);
        }

        public bool Remove(KeyValuePair<TKey, TValue> item) {
            return dictionary.Remove(item);
        }

        public int Count {
            get { return dictionary.Count; }
        }

        public bool IsReadOnly {
            get { return dictionary.IsReadOnly; }
        }

        public bool ContainsKey(TKey key) {
            return dictionary.ContainsKey(key);
        }

        public void Add(TKey key, TValue value) {
            dictionary.Add(key, value);
        }

        public bool Remove(TKey key) {
            return dictionary.Remove(key);
        }

        public bool TryGetValue(TKey key, out TValue value) {
            if (!dictionary.TryGetValue(key, out value)) {
                value = defaultValue;
            }

            return true;
        }

        public TValue this[TKey key] {
            get
            {
                try
                {
                    return dictionary[key];
                } catch (KeyNotFoundException) {
                    return defaultValue;
                }
            }

            set { dictionary[key] = value; }
        }

        public ICollection<TKey> Keys {
            get { return dictionary.Keys; }
        }

        public ICollection<TValue> Values {
            get
            {
                var values = new List<TValue>(dictionary.Values) {
                    defaultValue
                };
                return values;
            }
        }
    }

    public static class DefaultableDictionaryExtensions {
        public static IDictionary<TKey, TValue> WithDefaultValue<TValue, TKey>(this IDictionary<TKey, TValue> dictionary, TValue defaultValue ) {
            return new DefaultableDictionary<TKey, TValue>(dictionary, defaultValue);
        }
    }
}

This project is a simple decorator for an IDictionary object and an extension method to make it easy to use.

The DefaultableDictionary will allow for creating a wrapper around a dictionary that provides a default value when trying to access a key that does not exist or enumerating through all the values in an IDictionary.

Example: var dictionary = new Dictionary<string, int>().WithDefaultValue(5);

Blog post on the usage as well.

What is the difference between Digest and Basic Authentication?

Let us see the difference between the two HTTP authentication using Wireshark (Tool to analyse packets sent or received) .

1. Http Basic Authentication

As soon as the client types in the correct username:password,as requested by the Web-server, the Web-Server checks in the Database if the credentials are correct and gives the access to the resource .

Here is how the packets are sent and received :

In the first packet the Client fill the credentials using the POST method at the resource - lab/webapp/basicauth .In return the server replies back with http response code 200 ok ,i.e, the username:password were correct .

Now , In the Authorization header it shows that it is Basic Authorization followed by some random string .This String is the encoded (Base64) version of the credentials admin:aadd (including colon ) .

2 . Http Digest Authentication(rfc 2069)

So far we have seen that the Basic Authentication sends username:password in plaintext over the network .But the Digest Auth sends a HASH of the Password using Hash algorithm.

Here are packets showing the requests made by the client and response from the server .

As soon as the client types the credentials requested by the server , the Password is converted to a response using an algorithm and then is sent to the server , If the server Database has same response as given by the client the server gives the access to the resource , otherwise a 401 error .

In the above Authorization , the response string is calculated using the values of Username,Realm,Password,http-method,URI and Nonce as shown in the image :

(colons are included)

Hence , we can see that the Digest Authentication is more Secure as it involve Hashing (MD5 encryption) , So the packet sniffer tools cannot sniff the Password although in Basic Auth the exact Password was shown on Wireshark.

Difference between core and processor

Intel's picture is helpful, as shown by Tortuga's best answer. Here's a caption for it.

Processor: One semiconductor chip, the CPU (central processing unit) seated in one socket, circa 1950s-2010s. Over time, more functions have been packed onto the CPU chip. Prior to the 1950s releases of single-chip processors, one processor might have spread across multiple chips. In the mid 2010s the system-on-a-chip chips made it slightly more sketchy to equate one processor to one chip, though that's generally what people mean by processor, as in "this computer has an i7 processor" or "this computer system has four processors."

Core: One block of a CPU, executing one instruction at a time. (You'll see people say one instruction per clock cycle, but some CPUs use multiple clock cycles for some instructions.)

Serialize Property as Xml Attribute in Element

You will need wrapper classes:

public class SomeIntInfo
{
    [XmlAttribute]
    public int Value { get; set; }
}

public class SomeStringInfo
{
    [XmlAttribute]
    public string Value { get; set; }
}

public class SomeModel
{
    [XmlElement("SomeStringElementName")]
    public SomeStringInfo SomeString { get; set; }

    [XmlElement("SomeInfoElementName")]
    public SomeIntInfo SomeInfo { get; set; }
}

or a more generic approach if you prefer:

public class SomeInfo<T>
{
    [XmlAttribute]
    public T Value { get; set; }
}

public class SomeModel
{
    [XmlElement("SomeStringElementName")]
    public SomeInfo<string> SomeString { get; set; }

    [XmlElement("SomeInfoElementName")]
    public SomeInfo<int> SomeInfo { get; set; }
}

And then:

class Program
{
    static void Main()
    {
        var model = new SomeModel
        {
            SomeString = new SomeInfo<string> { Value = "testData" },
            SomeInfo = new SomeInfo<int> { Value = 5 }
        };
        var serializer = new XmlSerializer(model.GetType());
        serializer.Serialize(Console.Out, model);
    }
}

will produce:

<?xml version="1.0" encoding="ibm850"?>
<SomeModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <SomeStringElementName Value="testData" />
  <SomeInfoElementName Value="5" />
</SomeModel>

Plotting two variables as lines using ggplot2 on the same graph

For a small number of variables, you can build the plot manually yourself:

ggplot(test_data, aes(date)) + 
  geom_line(aes(y = var0, colour = "var0")) + 
  geom_line(aes(y = var1, colour = "var1"))

Pass arguments into C program from command line

Instead of getopt(), you may also consider using argp_parse() (an alternative interface to the same library).

From libc manual:

getopt is more standard (the short-option only version of it is a part of the POSIX standard), but using argp_parse is often easier, both for very simple and very complex option structures, because it does more of the dirty work for you.

But I was always happy with the standard getopt.

N.B. GNU getopt with getopt_long is GNU LGPL.

How to check if an array is empty?

To check array is null:

int arr[] = null;
if (arr == null) {
 System.out.println("array is null");
}

To check array is empty:

arr = new int[0];
if (arr.length == 0) {
 System.out.println("array is empty");
}

How do I execute cmd commands through a batch file?

cmd /k cd c:\ is the right answer

Flexbox Not Centering Vertically in IE

I found that ie browser have problem to vertically align inner containers, when only the min-height style is set or when height style is missing at all. What I did was to add height style with some value and that fix the issue for me.

for example :

.outer
    {
       display: -ms-flexbox;
       display: -webkit-flex;
       display: flex;

       /* Center vertically */
       align-items: center;

       /*Center horizontaly */
       justify-content: center;

       /*Center horizontaly ie */
       -ms-flex-pack: center;

        min-height: 220px; 
        height:100px;
    }

So now we have height style, but the min-height will overwrite it. That way ie is happy and we still can use min-height.

Hope this is helpful for someone.

SQL Server query - Selecting COUNT(*) with DISTINCT

Count all the DISTINCT program names by program type and push number

SELECT COUNT(DISTINCT program_name) AS Count,
  program_type AS [Type] 
FROM cm_production 
WHERE push_number=@push_number 
GROUP BY program_type

DISTINCT COUNT(*) will return a row for each unique count. What you want is COUNT(DISTINCT <expression>): evaluates expression for each row in a group and returns the number of unique, non-null values.

Turn off display errors using file "php.ini"

It is not enough in case of PHP fpm. It was one more configuration file which can enable display_error. You should find www.conf. In my case it is in directory /etc/php/7.1/fpm/pool.d/

You should find php_flag[display_errors] = on and disable it, php_flag[display_errors] = off. This should solve the issue.

Fatal error: Namespace declaration statement has to be the very first statement in the script in

Make sure there is no whitespace before your php tag

// whitespace
<?php
    namespace HelloWorld
?>

Remove the white space before your php tag starts

<?php
    namespace HelloWorld
?>

ActiveXObject in Firefox or Chrome (not IE!)

ActiveX resolved in Chrome!
Hello all this is not the solution but the successful workaround and I have implemented as well.
This required some implementation on client machine as well that why is most suitable for intranet environment and not recommended for public sites. Even though one can implement it for public sites as well the only problem is end user has to download/implement solution.
Lets understand the key problem
Chrome cannot communicate with ActiceX
Solution: Since Chorme cannot communicate with ActiveX but still it can communicate with the API hosted on the client machine. So develop API using .Net MVC or any other technology so that through Ajax call it can communicate with the API and API communicate with the ActiveX object situated on the client machine. Since API also resides in Client machine that why there is no problem in communication. This API works as mediator between Chrome browser and ActiveX.
During API implementation you might encounter CORS issues, Use JSONP to deal with it.
Pictorial view of the solution

Other solution : Use URI Scheme like MailTo: or MS-Word to deal with outlook and word application. If your requirement is different then you can implement your customized URI Scheme.

How to enable LogCat/Console in Eclipse for Android?

Write "LogCat" in Quick Access edit box in your eclipse window (top right corner, just before Open Prospective button). And just select LogCat it will open-up the LogCat window in your current prospect

enter image description here

How to compare objects by multiple fields

You can implement a Comparator which compares two Person objects, and you can examine as many of the fields as you like. You can put in a variable in your comparator that tells it which field to compare to, although it would probably be simpler to just write multiple comparators.

Spring @Transactional - isolation, propagation

Isolation level defines how the changes made to some data repository by one transaction affect other simultaneous concurrent transactions, and also how and when that changed data becomes available to other transactions. When we define a transaction using the Spring framework we are also able to configure in which isolation level that same transaction will be executed.

@Transactional(isolation=Isolation.READ_COMMITTED)
public void someTransactionalMethod(Object obj) {

}

READ_UNCOMMITTED isolation level states that a transaction may read data that is still uncommitted by other transactions.

READ_COMMITTED isolation level states that a transaction can't read data that is not yet committed by other transactions.

REPEATABLE_READ isolation level states that if a transaction reads one record from the database multiple times the result of all those reading operations must always be the same.

SERIALIZABLE isolation level is the most restrictive of all isolation levels. Transactions are executed with locking at all levels (read, range and write locking) so they appear as if they were executed in a serialized way.

Propagation is the ability to decide how the business methods should be encapsulated in both logical or physical transactions.

Spring REQUIRED behavior means that the same transaction will be used if there is an already opened transaction in the current bean method execution context.

REQUIRES_NEW behavior means that a new physical transaction will always be created by the container.

The NESTED behavior makes nested Spring transactions to use the same physical transaction but sets savepoints between nested invocations so inner transactions may also rollback independently of outer transactions.

The MANDATORY behavior states that an existing opened transaction must already exist. If not an exception will be thrown by the container.

The NEVER behavior states that an existing opened transaction must not already exist. If a transaction exists an exception will be thrown by the container.

The NOT_SUPPORTED behavior will execute outside of the scope of any transaction. If an opened transaction already exists it will be paused.

The SUPPORTS behavior will execute in the scope of a transaction if an opened transaction already exists. If there isn't an already opened transaction the method will execute anyway but in a non-transactional way.

Angularjs checkbox checked by default on load and disables Select list when checked

Do it in the controller ( controller as syntax below)

controller:

vm.question= {};
vm.question.active = true;

form

<input ng-model="vm.question.active" type="checkbox" id="active" name="active">

Unprotect workbook without password

No longer works for spreadsheets Protected with Excel 2013 or later -- they improved the pw hash. So now need to unzip .xlsx and hack the internals.

Best method for reading newline delimited files and discarding the newlines?

Here's a generator that does what you requested. In this case, using rstrip is sufficient and slightly faster than strip.

lines = (line.rstrip('\n') for line in open(filename))

However, you'll most likely want to use this to get rid of trailing whitespaces too.

lines = (line.rstrip() for line in open(filename))

RESTful call in Java

Most Easy Solution will be using Apache http client library. refer following sample code.. this code uses basic security for authenticating.

Add following Dependency.

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4</version>
</dependency>

CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
Credentials credentials = new UsernamePasswordCredentials("username", "password");
credentialsProvider.setCredentials(AuthScope.ANY, credentials);
HttpClient client = HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider).build();
HttpPost request = new HttpPost("https://api.plivo.com/v1/Account/MAYNJ3OT/Message/");HttpResponse response = client.execute(request);
    // Get the response
    BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
    String line = "";
    while ((line = rd.readLine()) != null) {    
    textView = textView + line;
    }
    System.out.println(textView);

using awk with column value conditions

If you're looking for a particular string, put quotes around it:

awk '$1 == "findtext" {print $3}'

Otherwise, awk will assume it's a variable name.

Check if string doesn't contain another string

Or alternatively, you could use this:

WHERE CHARINDEX(N'Apples', someColumn) = 0

Not sure which one performs better - you gotta test it! :-)

Marc

UPDATE: the performance seems to be pretty much on a par with the other solution (WHERE someColumn NOT LIKE '%Apples%') - so it's really just a question of your personal preference.

Best way to store chat messages in a database?

If you can avoid the need for concurrent writes to a single file, it sounds like you do not need a database to store the chat messages.

Just append the conversation to a text file (1 file per user\conversation). and have a directory/ file structure

Here's a simplified view of the file structure:

chat-1-bob.txt
        201101011029, hi
        201101011030, fine thanks.

chat-1-jen.txt
        201101011030, how are you?
        201101011035, have you spoken to bill recently?

chat-2-bob.txt
        201101021200, hi
        201101021222, about 12:22
chat-2-bill.txt
        201101021201, Hey Bob,
        201101021203, what time do you call this?

You would then only need to store the userid, conversation id (guid ?) & a reference to the file name.

I think you will find it hard to get a more simple scaleable solution.

You can use LOAD_FILE to get the data too see: http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

If you have a requirement to rebuild a conversation you will need to put a value (date time) alongside your sent chat message (in the file) to allow you to merge & sort the files, but at this point it is probably a good idea to consider using a database.

Python 3 - ValueError: not enough values to unpack (expected 3, got 2)

1. First should understand the error meaning

Error not enough values to unpack (expected 3, got 2) means:

a 2 part tuple, but assign to 3 values

and I have written demo code to show for you:


#!/usr/bin/python
# -*- coding: utf-8 -*-
# Function: Showing how to understand ValueError 'not enough values to unpack (expected 3, got 2)'
# Author: Crifan Li
# Update: 20191212

def notEnoughUnpack():
    """Showing how to understand python error `not enough values to unpack (expected 3, got 2)`"""
    # a dict, which single key's value is two part tuple
    valueIsTwoPartTupleDict = {
        "name1": ("lastname1", "email1"),
        "name2": ("lastname2", "email2"),
    }

    # Test case 1: got value from key
    gotLastname, gotEmail = valueIsTwoPartTupleDict["name1"] # OK
    print("gotLastname=%s, gotEmail=%s" % (gotLastname, gotEmail))
    # gotLastname, gotEmail, gotOtherSomeValue = valueIsTwoPartTupleDict["name1"] # -> ValueError not enough values to unpack (expected 3, got 2)

    # Test case 2: got from dict.items()
    for eachKey, eachValues in valueIsTwoPartTupleDict.items():
        print("eachKey=%s, eachValues=%s" % (eachKey, eachValues))
    # same as following:
    # Background knowledge: each of dict.items() return (key, values)
    # here above eachValues is a tuple of two parts
    for eachKey, (eachValuePart1, eachValuePart2) in valueIsTwoPartTupleDict.items():
        print("eachKey=%s, eachValuePart1=%s, eachValuePart2=%s" % (eachKey, eachValuePart1, eachValuePart2))
    # but following:
    for eachKey, (eachValuePart1, eachValuePart2, eachValuePart3) in valueIsTwoPartTupleDict.items(): # will -> ValueError not enough values to unpack (expected 3, got 2)
        pass

if __name__ == "__main__":
    notEnoughUnpack()

using VSCode debug effect:

notEnoughUnpack CrifanLi

2. For your code

for name, email, lastname in unpaidMembers.items():

but error ValueError: not enough values to unpack (expected 3, got 2)

means each item(a tuple value) in unpaidMembers, only have 1 parts:email, which corresponding above code

    unpaidMembers[name] = email

so should change code to:

for name, email in unpaidMembers.items():

to avoid error.

But obviously you expect extra lastname, so should change your above code to

    unpaidMembers[name] = (email, lastname)

and better change to better syntax:

for name, (email, lastname) in unpaidMembers.items():

then everything is OK and clear.

fs.writeFile in a promise, asynchronous-synchronous stuff

Because fs.writefile is a traditional asynchronous callback - you need to follow the promise spec and return a new promise wrapping it with a resolve and rejection handler like so:

return new Promise(function(resolve, reject) {
    fs.writeFile("<filename.type>", data, '<file-encoding>', function(err) {
        if (err) reject(err);
        else resolve(data);
    });
});

So in your code you would use it like so right after your call to .then():

 .then(function(results) {
    return new Promise(function(resolve, reject) {
            fs.writeFile(ASIN + '.json', JSON.stringify(results), function(err) {
               if (err) reject(err);
               else resolve(data);
            });
    });
  }).then(function(results) {
       console.log("results here: " + results)
  }).catch(function(err) {
       console.log("error here: " + err);
  });

How to send email by using javascript or jquery

The short answer is that you can't do it using JavaScript alone. You'd need a server-side handler to connect with the SMTP server to actually send the mail. There are many simple mail scripts online, such as this one for PHP:

Simple PHP mail script

Using a script like that, you'd POST the contents of your web form to the script, using a function like this:

jQuery.post

And then the script would take those values, plus a username and password for the mail server, and connect to the server to send the mail.

JQuery: Change value of hidden input field

Seems to work

$(".selector").change(function() {

    var $value = $(this).val();

    var $title = $(this).children('option[value='+$value+']').html();

    $('#bacon').val($title);

});

Just check with your firebug. And don't put css on hidden input.

Android App Not Install. An existing package by the same name with a conflicting signature is already installed

There may be another reason when your application will not update when you either change/add/remove shareId in AndroidManifiest.

"android:sharedUserId"

Please check that also.

To prevent would recommend to use sharedUserId in your application despite in your current requirement you need or now.

Cannot simply use PostgreSQL table name ("relation does not exist")

From what I've read, this error means that you're not referencing the table name correctly. One common reason is that the table is defined with a mixed-case spelling, and you're trying to query it with all lower-case.

In other words, the following fails:

CREATE TABLE "SF_Bands" ( ... );

SELECT * FROM sf_bands;  -- ERROR!

Use double-quotes to delimit identifiers so you can use the specific mixed-case spelling as the table is defined.

SELECT * FROM "SF_Bands";

Re your comment, you can add a schema to the "search_path" so that when you reference a table name without qualifying its schema, the query will match that table name by checked each schema in order. Just like PATH in the shell or include_path in PHP, etc. You can check your current schema search path:

SHOW search_path
  "$user",public

You can change your schema search path:

SET search_path TO showfinder,public;

Replace duplicate spaces with a single space in T-SQL

update mytable
set myfield = replace (myfield, '  ',  ' ')
where charindex('  ', myfield) > 0

Replace will work on all the double spaces, no need to put in multiple replaces. This is the set-based solution.

Opening Chrome From Command Line

Have a look into the start command. It should do what you're trying to achieve.

Also, you might be able to leave out path to chrome. The following works on Windows 7:

start chrome "site1.com" "site2.com"

Appending an id to a list if not already present in a string

What you are trying to do can almost certainly be achieved with a set.

>>> x = set([1,2,3])
>>> x.add(2)
>>> x
set([1, 2, 3])
>>> x.add(4)
>>> x.add(4)
>>> x
set([1, 2, 3, 4])
>>>

using a set's add method you can build your unique set of ids very quickly. Or if you already have a list

unique_ids = set(id_list)

as for getting your inputs in numeric form you can do something like

>>> ids = [int(n) for n in '350882 348521 350166\r\n'.split()]
>>> ids
[350882, 348521, 350166]

Cassandra "no viable alternative at input"

Wrong syntax. Here you are:

insert into user_by_category (game_category,customer_id) VALUES ('Goku','12');

or:

insert into user_by_category ("game_category","customer_id") VALUES ('Kakarot','12');

The second one is normally used for case-sensitive column names.

Error: cannot open display: localhost:0.0 - trying to open Firefox from CentOS 6.2 64bit and display on Win7

So, it turns out that X11 wasn't actually installed on the centOS. There didn't seem to be any indication anywhere of it not being installed. I did the following command and now firefox opens:

yum groupinstall 'X Window System'

Hope this answer will help others that are confused :)

What port number does SOAP use?

SOAP (Simple Object Access Protocol) is the communication protocol in the web service scenario.

One benefit of SOAP is that it allowas RPC to execute through a firewall. But to pass through a firewall, you will probably want to use 80. it uses port no.8084 To the firewall, a SOAP conversation on 80 looks like a POST to a web page. However, there are extensions in SOAP which are specifically aimed at the firewall. In the future, it may be that firewalls will be configured to filter SOAP messages. But as of today, most firewalls are SOAP ignorant.

so exclusively open SOAP Port in Firewalls

How to convert a huge list-of-vector to a matrix more efficiently?

I think you want

output <- do.call(rbind,lapply(z,matrix,ncol=10,byrow=TRUE))

i.e. combining @BlueMagister's use of do.call(rbind,...) with an lapply statement to convert the individual list elements into 11*10 matrices ...

Benchmarks (showing @flodel's unlist solution is 5x faster than mine, and 230x faster than the original approach ...)

n <- 1000
z <- replicate(n,matrix(1:110,ncol=10,byrow=TRUE),simplify=FALSE)
library(rbenchmark)
origfn <- function(z) {
    output <- NULL 
    for(i in 1:length(z))
        output<- rbind(output,matrix(z[[i]],ncol=10,byrow=TRUE))
}
rbindfn <- function(z) do.call(rbind,lapply(z,matrix,ncol=10,byrow=TRUE))
unlistfn <- function(z) matrix(unlist(z), ncol = 10, byrow = TRUE)

##          test replications elapsed relative user.self sys.self 
## 1   origfn(z)          100  36.467  230.804    34.834    1.540  
## 2  rbindfn(z)          100   0.713    4.513     0.708    0.012 
## 3 unlistfn(z)          100   0.158    1.000     0.144    0.008

If this scales appropriately (i.e. you don't run into memory problems), the full problem would take about 130*0.2 seconds = 26 seconds on a comparable machine (I did this on a 2-year-old MacBook Pro).

Split String into an array of String

String[] result = "hi i'm paul".split("\\s+"); to split across one or more cases.

Or you could take a look at Apache Common StringUtils. It has StringUtils.split(String str) method that splits string using white space as delimiter. It also has other useful utility methods

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