#Totem | Programs & Examples on Totem

PHP - get base64 img string decode and save as jpg (resulting empty image )

Here's what finally worked for me. You'll have to convert the code to suit your own needs, but this will do it.

$fname = filter_input(INPUT_POST, "name");
$img = filter_input(INPUT_POST, "image");
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$img = base64_decode($img);

file_put_contents($fname, $img);

print "Image has been saved!";

css - position div to bottom of containing div

Add position: relative to .outside. (https://developer.mozilla.org/en-US/docs/CSS/position)

Elements that are positioned relatively are still considered to be in the normal flow of elements in the document. In contrast, an element that is positioned absolutely is taken out of the flow and thus takes up no space when placing other elements. The absolutely positioned element is positioned relative to nearest positioned ancestor. If a positioned ancestor doesn't exist, the initial container is used.

The "initial container" would be <body>, but adding the above makes .outside positioned.

Vertical and horizontal align (middle and center) with CSS

There is a better solution now: Vertical align anything with just 3 lines of CSS

How to turn off the Eclipse code formatter for certain sections of Java code?

AFAIK from Eclipse 3.5 M4 on the formatter has an option "Never Join Lines" which preserves user lines breaks. Maybe that does what you want.

Else there is this ugly hack

String query = //
    "SELECT FOO, BAR, BAZ" + //
    "  FROM ABC"           + //
    " WHERE BAR > 4";

PHP how to get value from array if key is in a variable

Your code seems to be fine, make sure that key you specify really exists in the array or such key has a value in your array eg:

$array = array(4 => 'Hello There');
print_r(array_keys($array));
// or better
print_r($array);

Output:

Array
(
    [0] => 4
)

Now:

$key = 4;
$value = $array[$key];
print $value;

Output:

Hello There

Creating temporary files in bash

Is there any advantage in creating a temporary file in a more careful way

The temporary files are usually created in the temporary directory (such as /tmp) where all other users and processes has read and write access (any other script can create the new files there). Therefore the script should be careful about creating the files such as using with the right permissions (e.g. read only for the owner, see: help umask) and filename should be be not easily guessed (ideally random). Otherwise if the filenames aren't unique, it can create conflict with the same script ran multiple times (e.g. race condition) or some attacker could either hijack some sensitive information (e.g. when permissions are too open and filename is easy to guess) or create/replacing the file with their own version of the code (like replacing the commands or SQL queries depending on what is being stored).

You could use the following approach to create the temporary directory:

TMPDIR=".${0##*/}-$$" && mkdir -v "$TMPDIR"

or temporary file:

TMPFILE=".${0##*/}-$$" && touch "$TMPFILE"

However it is still predictable and not considered safe.

As per man mktemp, we can read:

Traditionally, many shell scripts take the name of the program with the pid as a suffix and use that as a temporary file name. This kind of naming scheme is predictable and the race condition it creates is easy for an attacker to win.

So to be safe, it is recommended to use mktemp command to create unique temporary file or directory (-d).

Change Twitter Bootstrap Tooltip content on click

Thanks this code was very helpful for me, i found it effective on my projects

$(element).attr('title', 'message').tooltip('fixTitle').tooltip('show');

How to use WinForms progress bar?

Since .NET 4.5 you can use combination of async and await with Progress for sending updates to UI thread:

private void Calculate(int i)
{
    double pow = Math.Pow(i, i);
}

public void DoWork(IProgress<int> progress)
{
    // This method is executed in the context of
    // another thread (different than the main UI thread),
    // so use only thread-safe code
    for (int j = 0; j < 100000; j++)
    {
        Calculate(j);

        // Use progress to notify UI thread that progress has
        // changed
        if (progress != null)
            progress.Report((j + 1) * 100 / 100000);
    }
}

private async void button1_Click(object sender, EventArgs e)
{
    progressBar1.Maximum = 100;
    progressBar1.Step = 1;

    var progress = new Progress<int>(v =>
    {
        // This lambda is executed in context of UI thread,
        // so it can safely update form controls
        progressBar1.Value = v;
    });

    // Run operation in another thread
    await Task.Run(() => DoWork(progress));

    // TODO: Do something after all calculations
}

Tasks are currently the preferred way to implement what BackgroundWorker does.

Tasks and Progress are explained in more detail here:

Async in 4.5: Enabling Progress and Cancellation in Async APIs

Reporting Progress from Async Tasks by Stephen Cleary

Task parallel library replacement for BackgroundWorker?

Mockito - NullpointerException when stubbing Method

Ed Webb's answer helped in my case. And instead, you can also try add

  @Rule public Mocks mocks = new Mocks(this);

if you @RunWith(JUnit4.class).

In java how to get substring from a string till a character c?

You can just split the string..

public String[] split(String regex)

Note that java.lang.String.split uses delimiter's regular expression value. Basically like this...

String filename = "abc.def.ghi";     // full file name
String[] parts = filename.split("\\."); // String array, each element is text between dots

String beforeFirstDot = parts[0];    // Text before the first dot

Of course, this is split into multiple lines for clairity. It could be written as

String beforeFirstDot = filename.split("\\.")[0];

Check element exists in array

You may be able to use the built-in function dir() to produce similar behavior to PHP's isset(), something like:

if 'foo' in dir():  # returns False, foo is not defined yet.
    pass

foo = 'b'

if 'foo' in dir():  # returns True, foo is now defined and in scope.
   pass

dir() returns a list of the names in the current scope, more information can be found here: http://docs.python.org/library/functions.html#dir.

C# HttpWebRequest of type "application/x-www-form-urlencoded" - how to send '&' character in content body?

As long as the server allows the ampresand character to be POSTed (not all do as it can be unsafe), all you should have to do is URL Encode the character. In the case of an ampresand, you should replace the character with %26.

.NET provides a nice way of encoding the entire string for you though:

string strNew = "&uploadfile=true&file=" + HttpUtility.UrlEncode(iCalStr);

Django. Override save for model

What I did to achieve the goal was to make this..

# I added an extra_command argument that defaults to blank
def save(self, extra_command="", *args, **kwargs):

and below the save() method is this..

# override the save method to create an image thumbnail
if self.image and extra_command != "skip creating photo thumbnail":
    # your logic here

so when i edit some fields but not editing the image, I put this..

Model.save("skip creating photo thumbnail")

you can replace the "skip creating photo thumbnail" with "im just editing the description" or a more formal text.

Hope this one helps!

How to fully clean bin and obj folders within Visual Studio?

You can easily find and remove bin and obj folders in Far Manager.

Navigate to you solution and press Alt+F7
In search setting dialog:
- Type "bin,obj" in field "A file mask or several file masks"
- Check option "Search for folders"
- Press Enter
After the search is done, switch view to "Panel".
Select all files (with Ctrl+A) and delete folders (press "Shift+Del")

Hope it helps someone.

Rails: Get Client IP address

I would just use the request.remote_ip that's simple and it works. Any reason you need another method?

See: Get real IP address in local Rails development environment for some other things you can do with client server ip's.

Unpacking a list / tuple of pairs into two lists / tuples

>>> source_list = ('1','a'),('2','b'),('3','c'),('4','d')
>>> list1, list2 = zip(*source_list)
>>> list1
('1', '2', '3', '4')
>>> list2
('a', 'b', 'c', 'd')

Edit: Note that zip(*iterable) is its own inverse:

>>> list(source_list) == zip(*zip(*source_list))
True

When unpacking into two lists, this becomes:

>>> list1, list2 = zip(*source_list)
>>> list(source_list) == zip(list1, list2)
True

Addition suggested by rocksportrocker.

How to pass parameters to ThreadStart method in Thread?

Look at this example:

public void RunWorker()
{
    Thread newThread = new Thread(WorkerMethod);
    newThread.Start(new Parameter());
}

public void WorkerMethod(object parameterObj)
{
    var parameter = (Parameter)parameterObj;
    // do your job!
}

You are first creating a thread by passing delegate to worker method and then starts it with a Thread.Start method which takes your object as parameter.

So in your case you should use it like this:

    Thread thread = new Thread(download);
    thread.Start(filename);

But your 'download' method still needs to take object, not string as a parameter. You can cast it to string in your method body.

Change language of Visual Studio 2017 RC

For having a language at Visual Studio Ui , basically the language package of that language must be installed during the installation.

You can not select a language in options -> environment -> international settings that didn't installed.

If the language that you want to select in above path is not appearing than you have to modify your visual studio by re-executing installer and selecting Language Packages tab and check your language that you want to have.

And than at Visual Studio toolbar just click Tools --> Options --> Environment --> International Settings and than select your language from dropdown list.

how to toggle attr() in jquery

$("form > .form-group > i").click(function(){
    $('#icon').toggleClass('fa-eye fa-eye-slash');

    if($('#icon').hasClass('fa-eye')){
        $('#Password1').attr('type','text');
    } else {
        $('#Password1').attr('type','password');
    }
});

CSS: image link, change on hover

The problem with changing it via JavaScript or CSS is that if you have a slower connection, the image will take a second to change to the hovered version. This will cause an undesirable flash as one disappears while the other downloads.

What I've done before is have two images. Then hide and show each depending on the hover state. This will allow for a clean switch between the two images.

<a href="/settings">
    <img class="default" src="settings-default.svg"/>
    <img class="hover" src="settings-hover.svg"/>
    <span>Settings</span>
</a>

a img.hover {
    display: none;
}
a img.default {
    display: inherit;
}
a:hover img.hover {
    display: inherit;
}
a:hover img.default {
    display: none;
}

Best way to store date/time in mongodb

The best way is to store native JavaScript Date objects, which map onto BSON native Date objects.

> db.test.insert({date: ISODate()})
> db.test.insert({date: new Date()})
> db.test.find()
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:42.389Z") }
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:57.240Z") }

The native type supports a whole range of useful methods out of the box, which you can use in your map-reduce jobs, for example.

If you need to, you can easily convert Date objects to and from Unix timestamps¹⁾, using the getTime() method and Date(milliseconds) constructor, respectively.

¹⁾ Strictly speaking, the Unix timestamp is measured in seconds. The JavaScript Date object measures in milliseconds since the Unix epoch.

How can I remove item from querystring in asp.net using c#?

Try this ...

PropertyInfo isreadonly   =typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);    

isreadonly.SetValue(this.Request.QueryString, false, null);
this.Request.QueryString.Remove("foo");

how to open a jar file in Eclipse

Try JadClipse.It will open all your .class file. Add library to your project and when you try to open any object declared in the lib file it will open just like your .java file.

In eclipse->help-> marketplace -> go to popular tab. There you can find plugins for the same.

Update: For those who are unable to find above plug-in, try downloading this: https://github.com/java-decompiler/jd-eclipse/releases/download/v1.0.0/jd-eclipse-site-1.0.0-RC2.zip

Then import it into Eclipse.

If you have issues importing above plug-in, refer: How to install plugin for Eclipse from .zip

How can I make content appear beneath a fixed DIV element?

I just added a padding-top to the div below the nav. Hope it helps. I'm new on this. C:

#nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    margin: 0 auto;
    padding: 0;
    background: url(../css/patterns/black_denim.png);
    z-index: 9999;
}

#container {
    display: block;
    padding: 6em 0 3em;
}

How to convert List to Json in Java

Use GSONBuilder with setPrettyPrinting and disableHtml for nice output.

String json = new GsonBuilder().setPrettyPrinting().disableHtmlEscaping().
                            create().toJson(outputList  );
                    fileOut.println(json);

android - save image into gallery

In my case the solutions above did not work I had to do the following:

sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(f)));

Eclipse shows errors but I can't find them

This happens from time to time in Eclipse. In the "Project" menu there's a "Clean" option, that usually takes care of the problem.

Focus Next Element In Tab Index

I checked above solutions and found them quite lengthy. It can be accomplished with just one line of code:

currentElement.nextElementSibling.focus();

currentElement.previousElementSibling.focus();

here currentElement may be any i.e. document.activeElement or this if current element is in function's context.

I tracked tab and shift-tab events with keydown event Here is a snippet that relies on "JQuery":

let cursorDirection = ''
$(document).keydown(function (e) {
    let key = e.which || e.keyCode;
    if (e.shiftKey) {
        //does not matter if user has pressed tab key or not.
        //If it matters for you then compare it with 9
        cursorDirection = 'prev';
    }
    else if (key == 9) {
        //if tab key is pressed then move next.
        cursorDirection = 'next';
    }
    else {
        cursorDirection == '';
    }
});

once you have cursor direction then you can use nextElementSibling.focus or previousElementSibling.focus methods

On npm install: Unhandled rejection Error: EACCES: permission denied

This one works for me:

sudo chown -R $(whoami) ~/.npm

I did not use the -g because I am the only user. I used a MacBook Air.

How can I specify a local gem in my Gemfile?

If you want the branch too:

gem 'foo', path: "point/to/your/path", branch: "branch-name"

Support for "border-radius" in IE

What about support for border radius AND background gradient. Yes IE9 is to support them both seperately but if you mix the two the gradient bleeds out of the rounded corner. Below is a link to a poor example but i have seen it in my own testing as well. Should of taken a screen shot :(

Maybe the real question is when will IE support CSS standards without MS-FILTER proprietary hacks.

http://frugalcoder.us/post/2010/09/15/ie9-corner-plus-gradient-fail.aspx

Position DIV relative to another DIV?

First set position of the parent DIV to relative (specifying the offset, i.e. left, top etc. is not necessary) and then apply position: absolute to the child DIV with the offset you want.
It's simple and should do the trick well.

How do I put variable values into a text string in MATLAB?

You can use fprintf/sprintf with familiar C syntax. Maybe something like:

fprintf('x = %d, y = %d \n x+y=%d \n x*y=%d \n x/y=%f\n', x,y,d,e,f)

reading your comment, this is how you use your functions from the main program:

x = 2;
y = 2;
[d e f] = answer(x,y);
fprintf('%d + %d = %d\n', x,y,d)
fprintf('%d * %d = %d\n', x,y,e)
fprintf('%d / %d = %f\n', x,y,f)

Also for the answer() function, you can assign the output values to a vector instead of three distinct variables:

function result=answer(x,y)
result(1)=addxy(x,y);
result(2)=mxy(x,y);
result(3)=dxy(x,y);

and call it simply as:

out = answer(x,y);

How do you count the number of occurrences of a certain substring in a SQL varchar?

In SQL 2017 or higher, you can use this:

declare @hits int = 0
set @hits = (select value from STRING_SPLIT('F609,4DFA,8499',','));
select count(@hits)

What is the Java equivalent for LINQ?

https://code.google.com/p/joquery/

Supports different possibilities,

Given collection,

Collection<Dto> testList = new ArrayList<>();

of type,

class Dto
{
    private int id;
    private String text;

    public int getId()
    {
        return id;
    }

    public int getText()
    {
        return text;
    }
}

Filter

Java 7

Filter<Dto> query = CQ.<Dto>filter(testList)
    .where()
    .property("id").eq().value(1);
Collection<Dto> filtered = query.list();

Java 8

Filter<Dto> query = CQ.<Dto>filter(testList)
    .where()
    .property(Dto::getId)
    .eq().value(1);
Collection<Dto> filtered = query.list();

Also,

Filter<Dto> query = CQ.<Dto>filter()
        .from(testList)
        .where()
        .property(Dto::getId).between().value(1).value(2)
        .and()
        .property(Dto::grtText).in().value(new string[]{"a","b"});

Sorting (also available for the Java 7)

Filter<Dto> query = CQ.<Dto>filter(testList)
        .orderBy()
        .property(Dto::getId)
        .property(Dto::getName)
    Collection<Dto> sorted = query.list();

Grouping (also available for the Java 7)

GroupQuery<Integer,Dto> query = CQ.<Dto,Dto>query(testList)
        .group()
        .groupBy(Dto::getId)
    Collection<Grouping<Integer,Dto>> grouped = query.list();

Joins (also available for the Java 7)

Given,

class LeftDto
{
    private int id;
    private String text;

    public int getId()
    {
        return id;
    }

    public int getText()
    {
        return text;
    }
}

class RightDto
{
    private int id;
    private int leftId;
    private String text;

    public int getId()
    {
        return id;
    }

    public int getLeftId()
        {
            return leftId;
        }

    public int getText()
    {
        return text;
    }
}

class JoinedDto
{
    private int leftId;
    private int rightId;
    private String text;

    public JoinedDto(int leftId,int rightId,String text)
    {
        this.leftId = leftId;
        this.rightId = rightId;
        this.text = text;
    }

    public int getLeftId()
    {
        return leftId;
    }

    public int getRightId()
        {
            return rightId;
        }

    public int getText()
    {
        return text;
    }
}

Collection<LeftDto> leftList = new ArrayList<>();

Collection<RightDto> rightList = new ArrayList<>();

Can be Joined like,

Collection<JoinedDto> results = CQ.<LeftDto, LeftDto>query().from(leftList)
                .<RightDto, JoinedDto>innerJoin(CQ.<RightDto, RightDto>query().from(rightList))
                .on(LeftFyo::getId, RightDto::getLeftId)
                .transformDirect(selection ->  new JoinedDto(selection.getLeft().getText()
                                                     , selection.getLeft().getId()
                                                     , selection.getRight().getId())
                                 )
                .list();

Expressions

Filter<Dto> query = CQ.<Dto>filter()
    .from(testList)
    .where()
    .exec(s -> s.getId() + 1).eq().value(2);

Select multiple columns using Entity Framework

var test_obj = from d in repository.DbPricing
join d1 in repository.DbOfficeProducts on d.OfficeProductId equals d1.Id
join d2 in repository.DbOfficeProductDetails on d1.ProductDetailsId equals d2.Id
    select new
    {
    PricingId = d.Id,
    LetterColor = d2.LetterColor,
    LetterPaperWeight = d2.LetterPaperWeight
    };


http://www.cybertechquestions.com/select-across-multiple-tables-in-entity-framework-resulting-in-a-generic-iqueryable_222801.html

What is the facade design pattern?

Facade Design Pattern comes under Structural Design Pattern. In short Facade means the exterior appearance. It means in Facade design pattern we hide something and show only what actually client requires. Read more at below blog: http://www.sharepointcafe.net/2017/03/facade-design-pattern-in-aspdotnet.html

HTML-5 date field shows as "mm/dd/yyyy" in Chrome, even when valid date is set

In chrome to set the value you need to do YYYY-MM-DD i guess because this worked : http://jsfiddle.net/HudMe/6/

So to make it work you need to set the date as 2012-10-01

What does '&' do in a C++ declaration?

string * and string& differ in a couple of ways. First of all, the pointer points to the address location of the data. The reference points to the data. If you had the following function:

int foo(string *param1);

You would have to check in the function declaration to make sure that param1 pointed to a valid location. Comparatively:

int foo(string &param1);

Here, it is the caller's responsibility to make sure the pointed to data is valid. You can't pass a "NULL" value, for example, int he second function above.

With regards to your second question, about the method return values being a reference, consider the following three functions:

string &foo();
string *foo();
string foo();

In the first case, you would be returning a reference to the data. If your function declaration looked like this:

string &foo()
{
    string localString = "Hello!";
    return localString;
}

You would probably get some compiler errors, since you are returning a reference to a string that was initialized in the stack for that function. On the function return, that data location is no longer valid. Typically, you would want to return a reference to a class member or something like that.

The second function above returns a pointer in actual memory, so it would stay the same. You would have to check for NULL-pointers, though.

Finally, in the third case, the data returned would be copied into the return value for the caller. So if your function was like this:

string foo()
{
    string localString = "Hello!";
    return localString;
}

You'd be okay, since the string "Hello" would be copied into the return value for that function, accessible in the caller's memory space.

C# Copy a file to another location with a different name

StreamReader reader = new StreamReader(Oldfilepath);
string fileContent = reader.ReadToEnd();

StreamWriter writer = new StreamWriter(NewFilePath);
writer.Write(fileContent);

Javascript decoding html entities

I think you are looking for this ?

$('#your_id').html('&lt;p&gt;name&lt;/p&gt;&lt;p&gt;&lt;span style="font-size:xx-small;"&gt;ajde&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;em&gt;da&lt;/em&gt;&lt;/p&gt;').text();

How can I set the initial value of Select2 when using AJAX?

Create simple ajax combo with de initial seleted value for select2 4.0.3

<select name="mycombo" id="mycombo""></select>                   
<script>
document.addEventListener("DOMContentLoaded", function (event) {
    selectMaker.create('table', 'idname', '1', $("#mycombo"), 2, 'type');                                
});
</script>

library .js

var selectMaker = {
create: function (table, fieldname, initialSelected, input, minimumInputLength = 3, type ='',placeholder = 'Select a element') {
    if (input.data('select2')) {
        input.select2("destroy");
    }
    input.select2({
        placeholder: placeholder,
        width: '100%',
        minimumInputLength: minimumInputLength,
        containerCssClass: type,
        dropdownCssClass: type,
        ajax: {
            url: 'ajaxValues.php?getQuery=true&table=' + table + '&fieldname=' + fieldname + '&type=' + type,
            type: 'post',
            dataType: 'json',
            contentType: "application/json",
            delay: 250,
            data: function (params) {
                return {
                    term: params.term, // search term
                    page: params.page
                };
            },
            processResults: function (data) {
                return {
                    results: $.map(data.items, function (item) {
                        return {
                            text: item.name,
                            id: item.id
                        }
                    })
                };
            }
        }
    });
    if (initialSelected>0) {
        var $option = $('<option selected>Cargando...</option>').val(0);
        input.append($option).trigger('change'); // append the option and update Select2
        $.ajax({// make the request for the selected data object
            type: 'GET',
            url: 'ajaxValues.php?getQuery=true&table=' + table + '&fieldname=' + fieldname + '&type=' + type + '&initialSelected=' + initialSelected,
            dataType: 'json'
        }).then(function (data) {
            // Here we should have the data object
            $option.text(data.items[0].name).val(data.items[0].id); // update the text that is displayed (and maybe even the value)
            $option.removeData(); // remove any caching data that might be associated
            input.trigger('change'); // notify JavaScript components of possible changes
        });
    }
}
};

and the php server side

<?php
if (isset($_GET['getQuery']) && isset($_GET['table']) && isset($_GET['fieldname'])) {
//parametros carga de petición
parse_str(file_get_contents("php://input"), $data);
$data = (object) $data;
if (isset($data->term)) {
    $term = pSQL($data->term);
}else{
    $term = '';
}
if (isset($_GET['initialSelected'])){
    $id =pSQL($_GET['initialSelected']);
}else{
    $id = '';
}
if ($_GET['table'] == 'mytable' && $_GET['fieldname'] == 'mycolname' && $_GET['type'] == 'mytype') {

    if (empty($id)){
        $where = "and name like '%" . $term . "%'";
    }else{
         $where = "and id= ".$id;
    }

    $rows = yourarrayfunctionfromsql("SELECT id, name 
                    FROM yourtable
                    WHERE 1 " . $where . "
                    ORDER BY name ");
}

$items = array("items" => $rows);
$var = json_encode($items);
echo $var;
?>

A column-vector y was passed when a 1d array was expected

Y = y.values[:,0]

Y - formated_train_y

y - train_y

Is it possible to set a timeout for an SQL query on Microsoft SQL server?

It sounds like more of an architectual issue, and any timeout/disconnect you can do would be more or less a band-aid. This has to be solved on SQL server side, by the way of read-only replica, transaction log shipping (to give you a read-only server to connect to), replication and such. Basically you give the DMZ sql server that heavy read can go to without killing stuff. This is very common. A well-designed SQL system won't be taken down by DDoS - that'd be like a car that dies if you step on the gas.

That said, if you are at the liberty to change the code, you could guesstimate if the query is too heavy and you could either reject or return only X rows in your stored procedure. If you are mated to some reporting tool and such and can't control the SELECT it generates, you could point it to a view and then do the safety valve in the view.

Also, if up-to-the-minute freshness isn't critical and you could compromise on that, like monthly sales data, then compiling a physical table of complex joins by job to avoid complex joins might do the trick - that way everything would be sub-second per query.

It entirely depends on what you are doing, but there is always a solution. Sometimes it takes extra coding to optimize it, sometimes it takes extra money to get you the secondary read-only DB, sometimes it needs time and attention in index tuning.

So it entirely depends, but I'd start with "what can I compromise? what can I change?" and go from there.

Spark - repartition() vs coalesce()

Justin's answer is awesome and this response goes into more depth.

The repartition algorithm does a full shuffle and creates new partitions with data that's distributed evenly. Let's create a DataFrame with the numbers from 1 to 12.

val x = (1 to 12).toList
val numbersDf = x.toDF("number")

numbersDf contains 4 partitions on my machine.

numbersDf.rdd.partitions.size // => 4

Here is how the data is divided on the partitions:

Partition 00000: 1, 2, 3
Partition 00001: 4, 5, 6
Partition 00002: 7, 8, 9
Partition 00003: 10, 11, 12

Let's do a full-shuffle with the repartition method and get this data on two nodes.

val numbersDfR = numbersDf.repartition(2)

Here is how the numbersDfR data is partitioned on my machine:

Partition A: 1, 3, 4, 6, 7, 9, 10, 12
Partition B: 2, 5, 8, 11

The repartition method makes new partitions and evenly distributes the data in the new partitions (the data distribution is more even for larger data sets).

Difference between coalesce and repartition

coalesce uses existing partitions to minimize the amount of data that's shuffled. repartition creates new partitions and does a full shuffle. coalesce results in partitions with different amounts of data (sometimes partitions that have much different sizes) and repartition results in roughly equal sized partitions.

Is coalesce or repartition faster?

coalesce may run faster than repartition, but unequal sized partitions are generally slower to work with than equal sized partitions. You'll usually need to repartition datasets after filtering a large data set. I've found repartition to be faster overall because Spark is built to work with equal sized partitions.

N.B. I've curiously observed that repartition can increase the size of data on disk. Make sure to run tests when you're using repartition / coalesce on large datasets.

Read this blog post if you'd like even more details.

When you'll use coalesce & repartition in practice

See this question on how to use coalesce & repartition to write out a DataFrame to a single file
It's critical to repartition after running filtering queries. The number of partitions does not change after filtering, so if you don't repartition, you'll have way too many memory partitions (the more the filter reduces the dataset size, the bigger the problem). Watch out for the empty partition problem.
partitionBy is used to write out data in partitions on disk. You'll need to use repartition / coalesce to partition your data in memory properly before using partitionBy.

Array of an unknown length in C#

You can create an array with the size set to a variable, i.e.

int size = 50;
string[] words = new string[size]; // contains 50 strings

However, that size can't change later on, if you decide you need 100 words. If you need the size to be really dynamic, you'll need to use a different sort of data structure. Try List.

Python idiom to return first item or None

Out of curiosity, I ran timings on two of the solutions. The solution which uses a return statement to prematurely end a for loop is slightly more costly on my machine with Python 2.5.1, I suspect this has to do with setting up the iterable.

import random
import timeit

def index_first_item(some_list):
    if some_list:
        return some_list[0]


def return_first_item(some_list):
    for item in some_list:
        return item


empty_lists = []
for i in range(10000):
    empty_lists.append([])

assert empty_lists[0] is not empty_lists[1]

full_lists = []
for i in range(10000):
    full_lists.append(list([random.random() for i in range(10)]))

mixed_lists = empty_lists[:50000] + full_lists[:50000]
random.shuffle(mixed_lists)

if __name__ == '__main__':
    ENV = 'import firstitem'
    test_data = ('empty_lists', 'full_lists', 'mixed_lists')
    funcs = ('index_first_item', 'return_first_item')
    for data in test_data:
        print "%s:" % data
        for func in funcs:
            t = timeit.Timer('firstitem.%s(firstitem.%s)' % (
                func, data), ENV)
            times = t.repeat()
            avg_time = sum(times) / len(times)
            print "  %s:" % func
            for time in times:
                print "    %f seconds" % time
            print "    %f seconds avg." % avg_time

These are the timings I got:

empty_lists:
  index_first_item:
    0.748353 seconds
    0.741086 seconds
    0.741191 seconds
    0.743543 seconds avg.
  return_first_item:
    0.785511 seconds
    0.822178 seconds
    0.782846 seconds
    0.796845 seconds avg.
full_lists:
  index_first_item:
    0.762618 seconds
    0.788040 seconds
    0.786849 seconds
    0.779169 seconds avg.
  return_first_item:
    0.802735 seconds
    0.878706 seconds
    0.808781 seconds
    0.830074 seconds avg.
mixed_lists:
  index_first_item:
    0.791129 seconds
    0.743526 seconds
    0.744441 seconds
    0.759699 seconds avg.
  return_first_item:
    0.784801 seconds
    0.785146 seconds
    0.840193 seconds
    0.803380 seconds avg.

Why would Oracle.ManagedDataAccess not work when Oracle.DataAccess does?

I received the same error message. To resolve this I just replaced the Oracle.ManagedDataAccess assembly with the older Oracle.DataAccess assembly. This solution may not work if you require new features found in the new assembly. In my case I have many more higher priority issues then trying to configure the new Oracle assembly.

MySQL VARCHAR size?

Actually, it will takes 101 bytes.

MySQL Reference

Pass entire form as data in jQuery Ajax function

In general use serialize() on the form element.

Please be mindful that multiple <select> options are serialized under the same key, e.g.

<select id="foo" name="foo" multiple="multiple">
    <option value="1">one</option>
    <option value="2">two</option>
    <option value="3">three</option>
</select>

will result in a query string that includes multiple occurences of the same query parameter:

[path]?foo=1&foo=2&foo=3&someotherparams...

which may not be what you want in the backend.

I use this JS code to reduce multiple parameters to a comma-separated single key (shamelessly copied from a commenter's response in a thread over at John Resig's place):

function compress(data) {
    data = data.replace(/([^&=]+=)([^&]*)(.*?)&\1([^&]*)/g, "$1$2,$4$3");
    return /([^&=]+=).*?&\1/.test(data) ? compress(data) : data;
}

which turns the above into:

[path]?foo=1,2,3&someotherparams...

In your JS code you'd call it like this:

var inputs = compress($("#your-form").serialize());

Hope that helps.

Should CSS always preceed Javascript?

Personally, I would not place too much emphasis on such "folk wisdom." What may have been true in the past might well not be true now. I would assume that all of the operations relating to a web-page's interpretation and rendering are fully asynchronous ("fetching" something and "acting upon it" are two entirely different things that might be being handled by different threads, etc.), and in any case entirely beyond your control or your concern.

I'd put CSS references in the "head" portion of the document, along with any references to external scripts. (Some scripts may demand to be placed in the body, and if so, oblige them.)

Beyond that ... if you observe that "this seems to be faster/slower than that, on this/that browser," treat this observation as an interesting but irrelevant curiosity and don't let it influence your design decisions. Too many things change too fast. (Anyone want to lay any bets on how many minutes it will be before the Firefox team comes out with yet another interim-release of their product? Yup, me neither.)

Can you force Vue.js to reload/re-render?

I found a way. It's a bit hacky but works.

vm.$set("x",0);
vm.$delete("x");

Where vm is your view-model object, and x is a non-existent variable.

Vue.js will complain about this in the console log but it does trigger a refresh for all data. Tested with version 1.0.26.

SOAP vs REST (differences)

What is REST

REST stands for representational state transfer, it's actually an architectural style for creating Web API which treats everything(data or functionality) as recourse. It expects; exposing resources through URI and responding in multiple formats and representational transfer of state of the resources in stateless manner. Here I am talking about two things:

Stateless manner: Provided by HTTP.
Representational transfer of state: For example if we are adding an employee. . into our system, it's in POST state of HTTP, after this it would be in GET state of HTTP, PUT and DELETE likewise.

REST can use SOAP web services because it is a concept and can use any protocol like HTTP, SOAP.SOAP uses services interfaces to expose the business logic. REST uses URI to expose business logic.

REST is not REST without HATEOAS. This means that a client only knows the entry point URI and the resources are supposed to return links the client should follow. Those fancy documentation generators that give URI patterns for everything you can do in a REST API miss the point completely. They are not only documenting something that's supposed to be following the standard, but when you do that, you're coupling the client to one particular moment in the evolution of the API, and any changes on the API have to be documented and applied, or it will break.

HATEOAS, an abbreviation for Hypermedia As The Engine Of Application State, is a constraint of the REST application architecture that distinguishes it from most other network application architectures. The principle is that a client interacts with a network application entirely through hypermedia provided dynamically by application servers. A REST client needs no prior knowledge about how to interact with any particular application or server beyond a generic understanding of hypermedia. By contrast, in some service-oriented architectures (SOA), clients and servers interact through a fixed interface shared through documentation or an interface description language (IDL).

Reference 1 Reference 2

Curl and PHP - how can I pass a json through curl by PUT,POST,GET

PUT

$data = array('username'=>'dog','password'=>'tall');
$data_json = json_encode($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json','Content-Length: ' . strlen($data_json)));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

POST

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

GET See @Dan H answer

DELETE

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response  = curl_exec($ch);
curl_close($ch);

How do I verify that a string only contains letters, numbers, underscores and dashes?

As an alternative to using regex you could do it in Sets:

from sets import Set

allowed_chars = Set('0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-')

if Set(my_little_sting).issubset(allowed_chars):
    # your action
    print True

Inserting records into a MySQL table using Java

There is a mistake in your insert statement chage it to below and try : String sql = "insert into table_name values ('" + Col1 +"','" + Col2 + "','" + Col3 + "')";

Awaiting multiple Tasks with different results

After you use WhenAll, you can pull the results out individually with await:

var catTask = FeedCat();
var houseTask = SellHouse();
var carTask = BuyCar();

await Task.WhenAll(catTask, houseTask, carTask);

var cat = await catTask;
var house = await houseTask;
var car = await carTask;

You can also use Task.Result (since you know by this point they have all completed successfully). However, I recommend using await because it's clearly correct, while Result can cause problems in other scenarios.

How do I pass JavaScript variables to PHP?

Is your function, which sets the hidden form value, being called? It is not in this example. You should have no problem modifying a hidden value before posting the form back to the server.

What is the difference between bottom-up and top-down?

Top down and bottom up DP are two different ways of solving the same problems. Consider a memoized (top down) vs dynamic (bottom up) programming solution to computing fibonacci numbers.

fib_cache = {}

def memo_fib(n):
  global fib_cache
  if n == 0 or n == 1:
     return 1
  if n in fib_cache:
     return fib_cache[n]
  ret = memo_fib(n - 1) + memo_fib(n - 2)
  fib_cache[n] = ret
  return ret

def dp_fib(n):
   partial_answers = [1, 1]
   while len(partial_answers) <= n:
     partial_answers.append(partial_answers[-1] + partial_answers[-2])
   return partial_answers[n]

print memo_fib(5), dp_fib(5)

I personally find memoization much more natural. You can take a recursive function and memoize it by a mechanical process (first lookup answer in cache and return it if possible, otherwise compute it recursively and then before returning, you save the calculation in the cache for future use), whereas doing bottom up dynamic programming requires you to encode an order in which solutions are calculated, such that no "big problem" is computed before the smaller problem that it depends on.

Store List to session

Yes, you can store any object (I assume you are using ASP.NET with default settings, which is in-process session state):

Session["test"] = myList;

You should cast it back to the original type for use:

var list = (List<int>)Session["test"];
// list.Add(something);

As Richard points out, you should take extra care if you are using other session state modes (e.g. SQL Server) that require objects to be serializable.

round value to 2 decimals javascript

If you want it visually formatted to two decimals as a string (for output) use toFixed():

var priceString = someValue.toFixed(2);

The answer by @David has two problems:

It leaves the result as a floating point number, and consequently holds the possibility of displaying a particular result with many decimal places, e.g. 134.1999999999 instead of "134.20".

If your value is an integer or rounds to one tenth, you will not see the additional decimal value:

var n = 1.099;
(Math.round( n * 100 )/100 ).toString() //-> "1.1"
n.toFixed(2)                            //-> "1.10"

var n = 3;
(Math.round( n * 100 )/100 ).toString() //-> "3"
n.toFixed(2)                            //-> "3.00"

And, as you can see above, using toFixed() is also far easier to type. ;)

Angular ng-if="" with multiple arguments

It is possible.

<span ng-if="checked && checked2">
  I'm removed when the checkbox is unchecked.
</span>

http://plnkr.co/edit/UKNoaaJX5KG3J7AswhLV?p=preview

Create a menu Bar in WPF?

<Container>
    <Menu>
        <MenuItem Header="File">
            <MenuItem Header="New">
               <MenuItem Header="File1"/>
               <MenuItem Header="File2"/>
               <MenuItem Header="File3"/>
            </MenuItem>
            <MenuItem Header="Open"/>
            <MenuItem Header="Save"/>
        </MenuItem>
    </Menu>
</Container>

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

The use-case for CORS is simple. Imagine the site alice.com has some data that the site bob.com wants to access. This type of request traditionally wouldn’t be allowed under the browser’s same origin policy. However, by supporting CORS requests, alice.com can add a few special response headers that allows bob.com to access the data. In order to understand it well, please visit this nice tutorial.. How to solve the issue of CORS

Authentication plugin 'caching_sha2_password' cannot be loaded

Open my sql command promt:

then enter mysql password

finally use:

ALTER USER 'username'@'ip_address' IDENTIFIED WITH mysql_native_password BY 'password';

refer:https://stackoverflow.com/a/49228443/6097074

Thanks.

PHP Deprecated: Methods with the same name

As mentioned in the error, the official manual and the comments:

Replace

public function TSStatus($host, $queryPort)

with

public function __construct($host, $queryPort)

Is there a way to 'uniq' by column?

Here is a very nifty way.

First format the content such that the column to be compared for uniqueness is a fixed width. One way of doing this is to use awk printf with a field/column width specifier ("%15s").

Now the -f and -w options of uniq can be used to skip preceding fields/columns and to specify the comparison width (column(s) width).

Here are three examples.

In the first example...

1) Temporarily make the column of interest a fixed width greater than or equal to the field's max width.

2) Use -f uniq option to skip the prior columns, and use the -w uniq option to limit the width to the tmp_fixed_width.

3) Remove trailing spaces from the column to "restore" it's width (assuming there were no trailing spaces beforehand).

printf "%s" "$str" \
| awk '{ tmp_fixed_width=15; uniq_col=8; w=tmp_fixed_width-length($uniq_col); for (i=0;i<w;i++) { $uniq_col=$uniq_col" "}; printf "%s\n", $0 }' \
| uniq -f 7 -w 15 \
| awk '{ uniq_col=8; gsub(/ */, "", $uniq_col); printf "%s\n", $0 }'

In the second example...

Create a new uniq column 1. Then remove it after the uniq filter has been applied.

printf "%s" "$str" \
| awk '{ uniq_col_1=4; printf "%15s %s\n", uniq_col_1, $0 }' \
| uniq -f 0 -w 15 \
| awk '{ $1=""; gsub(/^ */, "", $0); printf "%s\n", $0 }'

The third example is the same as the second, but for multiple columns.

printf "%s" "$str" \
| awk '{ uniq_col_1=4; uniq_col_2=8; printf "%5s %15s %s\n", uniq_col_1, uniq_col_2, $0 }' \
| uniq -f 0 -w 5 \
| uniq -f 1 -w 15 \
| awk '{ $1=$2=""; gsub(/^ */, "", $0); printf "%s\n", $0 }'

Passing HTML to template using Flask/Jinja2

Some people seem to turn autoescape off which carries security risks to manipulate the string display.

If you only want to insert some linebreaks into a string and convert the linebreaks into <br />, then you could take a jinja macro like:

{% macro linebreaks_for_string( the_string ) -%}
{% if the_string %}
{% for line in the_string.split('\n') %}
<br />
{{ line }}
{% endfor %}
{% else %}
{{ the_string }}
{% endif %}
{%- endmacro %}

and in your template just call this with

{{ linebreaks_for_string( my_string_in_a_variable ) }}

How to represent a fix number of repeats in regular expression?

The finite repetition syntax uses {m,n} in place of star/plus/question mark.

From java.util.regex.Pattern:

X{n}      X, exactly n times
X{n,}     X, at least n times
X{n,m}    X, at least n but not more than m times

All repetition metacharacter have the same precedence, so just like you may need grouping for *, +, and ?, you may also for {n,m}.

ha* matches e.g. "haaaaaaaa"
ha{3} matches only "haaa"
(ha)* matches e.g. "hahahahaha"
(ha){3} matches only "hahaha"

Also, just like *, +, and ?, you can add the ? and + reluctant and possessive repetition modifiers respectively.

    System.out.println(
        "xxxxx".replaceAll("x{2,3}", "[x]")
    ); "[x][x]"

    System.out.println(
        "xxxxx".replaceAll("x{2,3}?", "[x]")
    ); "[x][x]x"

Essentially anywhere a * is a repetition metacharacter for "zero-or-more", you can use {...} repetition construct. Note that it's not true the other way around: you can use finite repetition in a lookbehind, but you can't use * because Java doesn't officially support infinite-length lookbehind.

References

regular-expressions.info/Repetition

How to test if a list contains another list?

If we refine the problem talking about testing if a list contains another list with as a sequence, the answer could be the next one-liner:

def contains(subseq, inseq):
    return any(inseq[pos:pos + len(subseq)] == subseq for pos in range(0, len(inseq) - len(subseq) + 1))

Here unit tests I used to tune up this one-liner:

https://gist.github.com/anonymous/6910a85b4978daee137f

Python list directory, subdirectory, and files

Use os.path.join to concatenate the directory and file name:

for path, subdirs, files in os.walk(root):
    for name in files:
        print(os.path.join(path, name))

Note the usage of path and not root in the concatenation, since using root would be incorrect.

In Python 3.4, the pathlib module was added for easier path manipulations. So the equivalent to os.path.join would be:

pathlib.PurePath(path, name)

The advantage of pathlib is that you can use a variety of useful methods on paths. If you use the concrete Path variant you can also do actual OS calls through them, like changing into a directory, deleting the path, opening the file it points to and much more.

Reading Xml with XmlReader in C#

I am not experiented .But i think XmlReader is unnecessary. It is very hard to use.
XElement is very easy to use.
If you need performance ( faster ) you must change file format and use StreamReader and StreamWriter classes.

Convert Pandas DataFrame to JSON format

convert data-frame to list of dictionary

list_dict = []

for index, row in list(df.iterrows()):
    list_dict.append(dict(row))

save file

with open("output.json", mode) as f:
    f.write("\n".join(str(item) for item in list_dict))

Matplotlib tight_layout() doesn't take into account figure suptitle

I have struggled with the matplotlib trimming methods, so I've now just made a function to do this via a bash call to ImageMagick's mogrify command, which works well and gets all extra white space off the figure's edge. This requires that you are using UNIX/Linux, are using the bash shell, and have ImageMagick installed.

Just throw a call to this after your savefig() call.

def autocrop_img(filename):
    '''Call ImageMagick mogrify from bash to autocrop image'''
    import subprocess
    import os

    cwd, img_name = os.path.split(filename)

    bashcmd = 'mogrify -trim %s' % img_name
    process = subprocess.Popen(bashcmd.split(), stdout=subprocess.PIPE, cwd=cwd)

Virtualhost For Wildcard Subdomain and Static Subdomain

This also works for https needed a solution to making project directories this was it. because chrome doesn't like non ssl anymore used free ssl. Notice: My Web Server is Wamp64 on Windows 10 so I wouldn't use this config because of variables unless your using wamp.

<VirtualHost *:443>
ServerAdmin [email protected]
ServerName test.com
ServerAlias *.test.com

SSLEngine On
SSLCertificateFile "conf/key/certificatecom.crt"
SSLCertificateKeyFile "conf/key/privatecom.key"

VirtualDocumentRoot "${INSTALL_DIR}/www/subdomains/%1/"

DocumentRoot "${INSTALL_DIR}/www/subdomains"
<Directory "${INSTALL_DIR}/www/subdomains/">
    Options +Indexes +Includes +FollowSymLinks +MultiViews
AllowOverride All
Require all granted
</Directory>

How to add lines to end of file on Linux

The easiest way is to redirect the output of the echo by >>:

echo 'VNCSERVERS="1:root"' >> /etc/sysconfig/configfile
echo 'VNCSERVERARGS[1]="-geometry 1600x1200"' >> /etc/sysconfig/configfile

MySQL: Can't create table (errno: 150)

If the PK table is created in one CHARSET and then you create FK table in another CHARSET..then also you might get this error...I too got this error but after changing the charset to PK charset then it got executed without errors

create table users
(
------------
-------------
)DEFAULT CHARSET=latin1;


create table Emp
(
---------
---------
---------
FOREIGN KEY (userid) REFERENCES users(id) on update cascade on delete cascade)ENGINE=InnoDB, DEFAULT CHARSET=latin1;

Could not find a version that satisfies the requirement tensorflow

Running this before the tensorflow installation solved it for me:

pip install "pip>=19"

As the tensorflow's system requirements states:

pip 19.0 or later

Disable dragging an image from an HTML page

window.ondragstart = function() { return false; }

Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied

If you literally want a one line equivalent to the commands in your original question, you could alias:

mongo --eval "db.getSiblingDB('admin').shutdownServer()"

https://stackoverflow.com/a/11777141/7160782

How can I reset or revert a file to a specific revision?

You can do it in 4 steps:

revert the entire commit with the file you want to specifically revert - it will create a new commit on your branch
soft reset that commit - removes the commit and moves the changes to the working area
handpick the files to revert and commit them
drop all other files in your work area

What you need to type in your terminal:

git revert <commit_hash>
git reset HEAD~1
git add <file_i_want_to_revert> && git commit -m 'reverting file'
git checkout .

good luck

Defining an abstract class without any abstract methods

Yes you can. The abstract class used in java signifies that you can't create an object of the class. And an abstract method the subclasses have to provide an implementation for that method.

So you can easily define an abstract class without any abstract method.

As for Example :

public abstract class AbstractClass{

    public String nonAbstractMethodOne(String param1,String param2){
        String param = param1 + param2;
        return param;
    }

    public static void nonAbstractMethodTwo(String param){
        System.out.println("Value of param is "+param);
    }
}

This is fine.

SQL multiple column ordering

Multiple column ordering depends on both column's corresponding values: Here is my table example where are two columns named with Alphabets and Numbers and the values in these two columns are asc and desc orders.

Now I perform Order By in these two columns by executing below command:

Now again I insert new values in these two columns, where Alphabet value in ASC order:

and the columns in Example table look like this. Now again perform the same operation:

You can see the values in the first column are in desc order but second column is not in ASC order.

Android emulator failed to allocate memory 8

I had the same problem and what ended up being the issue was the RAM size: apparently 1024 (or whatever size) is different from 1024MB. Make sure you specify the units and it should work for you.

This Activity already has an action bar supplied by the window decor

Go to the 'style.xml' of your project and make windowActionBar to false

<style name="AppCompatTheme" parent="@style/Theme.AppCompat.Light">
        <item name="android:windowActionBar">false</item>
</style>

Static methods - How to call a method from another method?

You can’t call non-static methods from static methods, but by creating an instance inside the static method.

It should work like that

class test2(object):
    def __init__(self):
        pass

    @staticmethod
    def dosomething():
        print "do something"
        # Creating an instance to be able to
        # call dosomethingelse(), or you
        # may use any existing instance
        a = test2()
        a.dosomethingelse()

    def dosomethingelse(self):
        print "do something else"

test2.dosomething()

What is the maximum length of data I can put in a BLOB column in MySQL?

A BLOB can be 65535 bytes maximum. If you need more consider using a MEDIUMBLOB for 16777215 bytes or a LONGBLOB for 4294967295 bytes.

Hope, it will help you.

JavaScript require() on client side

I asked myself the very same questions. When I looked into it I found the choices overwhelming.

Fortunately I found this excellent spreadsheet that helps you choice the best loader based on your requirements:

https://spreadsheets.google.com/lv?key=tDdcrv9wNQRCNCRCflWxhYQ

Where to change the value of lower_case_table_names=2 on windows xampp

ADD following -

look up for: # The MySQL server [mysqld]
add this right below it: lower_case_table_names = 1 In file - /etc/mysql/mysql.conf.d/mysqld.cnf

It's works for me.

Amazon S3 direct file upload from client browser - private key disclosure

You can do this by AWS S3 Cognito try this link here :

http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/browser-examples.html#Amazon_S3

Also try this code

Just change Region, IdentityPoolId and Your bucket name

_x000D_

<!DOCTYPE html>_x000D_
<html>_x000D_
_x000D_
<head>_x000D_
    <title>AWS S3 File Upload</title>_x000D_
    <script src="https://sdk.amazonaws.com/js/aws-sdk-2.1.12.min.js"></script>_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
    <input type="file" id="file-chooser" />_x000D_
    <button id="upload-button">Upload to S3</button>_x000D_
    <div id="results"></div>_x000D_
    <script type="text/javascript">_x000D_
    AWS.config.region = 'your-region'; // 1. Enter your region_x000D_
_x000D_
    AWS.config.credentials = new AWS.CognitoIdentityCredentials({_x000D_
        IdentityPoolId: 'your-IdentityPoolId' // 2. Enter your identity pool_x000D_
    });_x000D_
_x000D_
    AWS.config.credentials.get(function(err) {_x000D_
        if (err) alert(err);_x000D_
        console.log(AWS.config.credentials);_x000D_
    });_x000D_
_x000D_
    var bucketName = 'your-bucket'; // Enter your bucket name_x000D_
    var bucket = new AWS.S3({_x000D_
        params: {_x000D_
            Bucket: bucketName_x000D_
        }_x000D_
    });_x000D_
_x000D_
    var fileChooser = document.getElementById('file-chooser');_x000D_
    var button = document.getElementById('upload-button');_x000D_
    var results = document.getElementById('results');_x000D_
    button.addEventListener('click', function() {_x000D_
_x000D_
        var file = fileChooser.files[0];_x000D_
_x000D_
        if (file) {_x000D_
_x000D_
            results.innerHTML = '';_x000D_
            var objKey = 'testing/' + file.name;_x000D_
            var params = {_x000D_
                Key: objKey,_x000D_
                ContentType: file.type,_x000D_
                Body: file,_x000D_
                ACL: 'public-read'_x000D_
            };_x000D_
_x000D_
            bucket.putObject(params, function(err, data) {_x000D_
                if (err) {_x000D_
                    results.innerHTML = 'ERROR: ' + err;_x000D_
                } else {_x000D_
                    listObjs();_x000D_
                }_x000D_
            });_x000D_
        } else {_x000D_
            results.innerHTML = 'Nothing to upload.';_x000D_
        }_x000D_
    }, false);_x000D_
    function listObjs() {_x000D_
        var prefix = 'testing';_x000D_
        bucket.listObjects({_x000D_
            Prefix: prefix_x000D_
        }, function(err, data) {_x000D_
            if (err) {_x000D_
                results.innerHTML = 'ERROR: ' + err;_x000D_
            } else {_x000D_
                var objKeys = "";_x000D_
                data.Contents.forEach(function(obj) {_x000D_
                    objKeys += obj.Key + "<br>";_x000D_
                });_x000D_
                results.innerHTML = objKeys;_x000D_
            }_x000D_
        });_x000D_
    }_x000D_
    </script>_x000D_
</body>_x000D_
_x000D_
</html>

_x000D_

For more details, Please check - Github

CSS getting text in one line rather than two

The best way to use is white-space: nowrap; This will align the text to one line.

How to convert integers to characters in C?

In C, int, char, long, etc. are all integers.

They typically have different memory sizes and thus different ranges as in INT_MIN to INT_MAX. char and arrays of char are often used to store characters and strings. Integers are stored in many types: int being the most popular for a balance of speed, size and range.

ASCII is by far the most popular character encoding, but others exist. The ASCII code for an 'A' is 65, 'a' is 97, '\n' is 10, etc. ASCII data is most often stored in a char variable. If the C environment is using ASCII encoding, the following all store the same value into the integer variable.

int i1 = 'a';
int i2 = 97;
char c1 = 'a';
char c2 = 97;

To convert an int to a char, simple assign:

int i3 = 'b';
int i4 = i3;
char c3;
char c4;
c3 = i3;
// To avoid a potential compiler warning, use a cast `char`.
c4 = (char) i4;

This warning comes up because int typically has a greater range than char and so some loss-of-information may occur. By using the cast (char), the potential loss of info is explicitly directed.

To print the value of an integer:

printf("<%c>\n", c3); // prints <b>

// Printing a `char` as an integer is less common but do-able
printf("<%d>\n", c3); // prints <98>

// Printing an `int` as a character is less common but do-able.
// The value is converted to an `unsigned char` and then printed.
printf("<%c>\n", i3); // prints <b>

printf("<%d>\n", i3); // prints <98>

There are additional issues about printing such as using %hhu or casting when printing an unsigned char, but leave that for later. There is a lot to printf().

Copying an array of objects into another array in javascript

A great way for cloning an array is with an array literal and the spread syntax. This is made possible by ES2015.

const objArray = [{name:'first'}, {name:'second'}, {name:'third'}, {name:'fourth'}];

const clonedArr = [...objArray];

console.log(clonedArr) // [Object, Object, Object, Object]

You can find this copy option in MDN's documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator#Copy_an_array

It is also an Airbnb's best practice. https://github.com/airbnb/javascript#es6-array-spreads

Note: The spread syntax in ES2015 goes one level deep while copying an array. Therefore, they are unsuitable for copying multidimensional arrays.

Where does the iPhone Simulator store its data?

One of the most easy ways to find where the app is within the simulator. User "NSTemporaryDirectory()"

Steps-

Apply breakpoint anywhere within the app and run the app.
When the app stops at the breakpoint, type following command in Xcode console.

po NSTemporaryDirectory()

See the below image for a proper insight

Now you have the exact path upto temporary folder. You can go back and see all app related folders.

Hope this also helps. Happy Coding :)

Gradle - Could not find or load main class

I fixed this by running a clean of by gradle build (or delete the gradle build folder mannually)

This occurs if you move the main class to a new package and the old main class is still referenced in the claspath

How do I remove repeated elements from ArrayList?

It is possible to remove duplicates from arraylist without using HashSet or one more arraylist.

Try this code..

    ArrayList<String> lst = new ArrayList<String>();
    lst.add("ABC");
    lst.add("ABC");
    lst.add("ABCD");
    lst.add("ABCD");
    lst.add("ABCE");

    System.out.println("Duplicates List "+lst);

    Object[] st = lst.toArray();
      for (Object s : st) {
        if (lst.indexOf(s) != lst.lastIndexOf(s)) {
            lst.remove(lst.lastIndexOf(s));
         }
      }

    System.out.println("Distinct List "+lst);

Output is

Duplicates List [ABC, ABC, ABCD, ABCD, ABCE]
Distinct List [ABC, ABCD, ABCE]

What is a "slug" in Django?

Also auto slug at django-admin. Added at ModelAdmin:

prepopulated_fields = {'slug': ('title', )}

As here:

class ArticleAdmin(admin.ModelAdmin):
    list_display = ('title', 'slug')
    search_fields = ('content', )

    prepopulated_fields = {'slug': ('title', )}

How can I remove duplicate rows?

Now lets look elasticalsearch table which this tables has duplicated rows and Id is identical uniq field. We know if some id exist by a group criteria then we can delete other rows outscope of this group. My manner shows this criteria.

So many case of this thread are in the like state of mine. Just change your target group criteria according your case for deleting repeated (duplicated) rows.

DELETE 
FROM elasticalsearch
WHERE Id NOT IN 
               (SELECT min(Id)
                     FROM elasticalsearch
                     GROUP BY FirmId,FilterSearchString
                     )

cheers

Difference of keywords 'typename' and 'class' in templates?

No difference
Template type parameter Container is itself a template with two type parameters.

Printing all properties in a Javascript Object

Your syntax is incorrect. The var keyword in your for loop must be followed by a variable name, in this case its propName

var propValue;
for(var propName in nyc) {
    propValue = nyc[propName]

    console.log(propName,propValue);
}

I suggest you have a look here for some basics:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Cannot resolve method 'getSupportFragmentManager ( )' inside Fragment

I tried all above, but none working

Finally tried this my own

getBaseActivity().getFragmentManager()

and is working .. :)

Difference between save and saveAndFlush in Spring data jpa

On saveAndFlush, changes will be flushed to DB immediately in this command. With save, this is not necessarily true, and might stay just in memory, until flush or commit commands are issued.

But be aware, that even if you flush the changes in transaction and do not commit them, the changes still won't be visible to the outside transactions until the commit in this transaction.

In your case, you probably use some sort of transactions mechanism, which issues commit command for you if everything works out fine.

Returning a value from callback function in Node.js

Example code for node.js - async function to sync function:

var deasync = require('deasync');

function syncFunc()
{
    var ret = null;
    asyncFunc(function(err, result){
        ret = {err : err, result : result}
    });

    while((ret == null))
    {
         deasync.runLoopOnce();
    }

    return (ret.err || ret.result);
}

Session variables in ASP.NET MVC

You can use ViewModelBase as base class for all models , this class will take care of pulling data from session

class ViewModelBase 
{
  public User CurrentUser 
  {
     get { return System.Web.HttpContext.Current.Session["user"] as User };
     set 
     {
        System.Web.HttpContext.Current.Session["user"]=value; 
     }
  }
}

You can write a extention method on HttpContextBase to deal with session data

T FromSession<T>(this HttpContextBase context ,string key,Action<T> getFromSource=null) 
{
    if(context.Session[key]!=null) 
    {
        return (T) context.Session[key];
    }
  else if(getFromSource!=null) 
  {
    var value = getFromSource();
   context.Session[key]=value; 
   return value; 
   }
  else 
  return null;
}

Use this like below in controller

User userData = HttpContext.FromSession<User>("userdata",()=> { return user object from service/db  });

The second argument is optional it will be used fill session data for that key when value is not present in session.

Can I hide the HTML5 number input’s spin box?

I've encountered this problem with a input[type="datetime-local"], which is similar to this problem.

And I've found a way to overcome this kind of problems.

First, you must turn on chrome's shadow-root feature by "DevTools -> Settings -> General -> Elements -> Show user agent shadow DOM"

Then you can see all shadowed DOM elements, for example, for <input type="number">, the full element with shadowed DOM is:

_x000D_

<input type="number">_x000D_
  <div id="text-field-container" pseudo="-webkit-textfield-decoration-container">_x000D_
    <div id="editing-view-port">_x000D_
      <div id="inner-editor"></div>_x000D_
    </div>_x000D_
    <div pseudo="-webkit-inner-spin-button" id="spin"></div>_x000D_
  </div>_x000D_
</input>

_x000D_

And according to these info, you can draft some CSS to hide unwanted elements, just as @Josh said.

Convert array of strings to List<string>

Just use this constructor of List<T>. It accepts any IEnumerable<T> as an argument.

string[] arr = ...
List<string> list = new List<string>(arr);

Add MIME mapping in web.config for IIS Express

I'm not using IIS Express but developing against my Local Full IIS 7.

So if anyone else get's here trying to do that, I had to add the mime type for woff via IIS Manager

Mime Types >> Click Add link on right and then enter Extension: .woff MIME type: application/font-woff

How do I plot list of tuples in Python?

With gnuplot using gplot.py

from gplot import *

l = [(0, 6.0705199999997801e-08), (1, 2.1015700100300739e-08), 
 (2, 7.6280656623374823e-09), (3, 5.7348209304555086e-09), 
 (4, 3.6812203579604238e-09), (5, 4.1572516753310418e-09)]

gplot.log('y')
gplot(*zip(*l))

enter image description here

IE8 issue with Twitter Bootstrap 3

I had this same issue when transitioning from Bootstrap 2 to 3. I'd already got respond.js and html5shiv.js and set my meta to edge. I'd missed that from 2 to 3 the navbar element type had changed. In Bootstrap 2 it was nav. In Bootstrap 3 it's now header. So to fully resolve the problem I had to

<meta http-equiv="X-UA-Compatible" content="IE=edge">

Put this right after I'd loaded my css:

<!--[if lt IE 9]>  
    <script src="~/Content/compatibility/html5shiv.js"></script>
    <script src="~/Content/compatibility/respond.min.js"></script>
<![endif]-->

and then change

<nav class="navbar" role="navigation">
</nav>

<header class="navbar" role="navigation">
</header>

Oh and for good measure I also added

<meta name="viewport" content="width=device-width, initial-scale=1.0">

simply because that's what the Bootstrap site itself has.

How do change the color of the text of an <option> within a <select>?

Suresh, you don't need use anything in your codes. What you need is just something like this:

_x000D_

.others {_x000D_
    color:black_x000D_
}

_x000D_

<select id="select">_x000D_
    <option style="color:gray" value="null">select one option</option>_x000D_
    <option value="1" class="others">one</option>_x000D_
    <option value="2" class="others">two</option>_x000D_
</select>

_x000D_

But as you can see, because your first item in options is the first thing that your select control shows, you can not see its assigned color. While if you open the select list and see the opened items, you will see you could assign a gray color to the first option. So you need something else in jQuery.

$(document).ready(function() {
   $('#select').css('color','gray');
   $('#select').change(function() {
      var current = $('#select').val();
      if (current != 'null') {
          $('#select').css('color','black');
      } else {
          $('#select').css('color','gray');
      }
   }); 
});

This is my code in jsFiddle.

Doctrine and LIKE query

You can use the createQuery method (direct in the controller) :

$query = $em->createQuery("SELECT o FROM AcmeCodeBundle:Orders o WHERE o.OrderMail =  :ordermail and o.Product like :searchterm")
->setParameter('searchterm', '%'.$searchterm.'%')
->setParameter('ordermail', '[email protected]');

You need to change AcmeCodeBundle to match your bundle name

Or even better - create a repository class for the entity and create a method in there - this will make it reusable

How to find all duplicate from a List<string>?

I'm assuming each string in your list contains several words, let me know if that's incorrect.

List<string> list = File.RealAllLines("foobar.txt").ToList();

var words = from line in list
            from word in line.Split(new[] { ' ', ';', ',', '.', ':', '(', ')' }, StringSplitOptions.RemoveEmptyEntries)
            select word;

var duplicateWords = from w in words
                     group w by w.ToLower() into g
                     where g.Count() > 1
                     select new
                     {
                         Word = g.Key,
                         Count = g.Count()
                     }

C: scanf to array

The %d conversion specifier will only convert one decimal integer. It doesn't know that you're passing an array, it can't modify its behavior based on that. The conversion specifier specifies the conversion.

There is no specifier for arrays, you have to do it explicitly. Here's an example with four conversions:

if(scanf("%d %d %d %d", &array[0], &array[1], &array[2], &array[3]) == 4)
  printf("got four numbers\n");

Note that this requires whitespace between the input numbers.

If the id is a single 11-digit number, it's best to treat as a string:

char id[12];

if(scanf("%11s", id) == 1)
{
  /* inspect the *character* in id[0], compare with '1' or '2' for instance. */
}

Unable to start debugging on the web server. Could not start ASP.NET debugging VS 2010, II7, Win 7 x64

I had the same problem when I created application in Visual Studio, and then in properties created virtual directory for use with local IIS. If someone has this error it is because VS creates application under wrong AppPool, i.e. under AppPool which doesn't suit your needs.
If this is the case, go to IIS Manager, select App, Go to Basic settings and change AppPool for App and you are good to go.

Using a Python subprocess call to invoke a Python script

Windows? Unix?

Unix will need a shebang and exec attribute to work:

#!/usr/bin/env python

as the first line of script and:

chmod u+x script.py

at command-line or

call('python script.py'.split())

as mentioned previously.

Windows should work if you add the shell=True parameter to the "call" call.

How to Extract Year from DATE in POSTGRESQL

answer is;

select date_part('year', timestamp '2001-02-16 20:38:40') as year,
       date_part('month', timestamp '2001-02-16 20:38:40') as month,
       date_part('day', timestamp '2001-02-16 20:38:40') as day,
       date_part('hour', timestamp '2001-02-16 20:38:40') as hour,
       date_part('minute', timestamp '2001-02-16 20:38:40') as minute

How to get the CUDA version?

Open a terminal and run these commands:

cd /usr/local/cuda/samples/1_Utilities/deviceQuery
sudo make
./deviceQuery

You can get the information of CUDA Driver version, CUDA Runtime Version, and also detailed information for GPU(s). An image example of the output from my end is as below.

You can find the image here.

How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?

You can also use a pretty simple for loop:

for f in `find . -not -name "*Music*"`
do
    cp $f /target/dir
done

How to create roles in ASP.NET Core and assign them to users?

I have created an action in the Accounts controller that calls a function to create the roles and assign the Admin role to the default user. (You should probably remove the default user in production):

    private async Task CreateRolesandUsers()
    {  
        bool x = await _roleManager.RoleExistsAsync("Admin");
        if (!x)
        {
            // first we create Admin rool    
            var role = new IdentityRole();
            role.Name = "Admin";
            await _roleManager.CreateAsync(role);

            //Here we create a Admin super user who will maintain the website                   

            var user = new ApplicationUser();
            user.UserName = "default";
            user.Email = "[email protected]";

            string userPWD = "somepassword";

            IdentityResult chkUser = await _userManager.CreateAsync(user, userPWD);

            //Add default User to Role Admin    
            if (chkUser.Succeeded)
            {
                var result1 = await _userManager.AddToRoleAsync(user, "Admin");
            }
        }

        // creating Creating Manager role     
        x = await _roleManager.RoleExistsAsync("Manager");
        if (!x)
        {
            var role = new IdentityRole();
            role.Name = "Manager";
            await _roleManager.CreateAsync(role);
        }

        // creating Creating Employee role     
        x = await _roleManager.RoleExistsAsync("Employee");
        if (!x)
        {
            var role = new IdentityRole();
            role.Name = "Employee";
            await _roleManager.CreateAsync(role);
        }
  }

After you could create a controller to manage roles for the users.

An error occurred while executing the command definition. See the inner exception for details

In my case, I messed up the connectionString property in a publish profile, trying to access the wrong database (Initial Catalog). Entity Framework then complains that the entities do not match the database, and rightly so.

'POCO' definition

Interesting. The only thing I knew that had to do with programming and had POCO in it is the POCO C++ framework.

Java heap terminology: young, old and permanent generations?

Memory in SunHotSpot JVM is organized into three generations: young generation, old generation and permanent generation.

Young Generation : the newly created objects are allocated to the young gen.
Old Generation : If the new object requests for a larger heap space, it gets allocated directly into the old gen. Also objects which have survived a few GC cycles gets promoted to the old gen i.e long lived objects house in old gen.
Permanent Generation : The permanent generation holds objects that the JVM finds convenient to have the garbage collector manage, such as objects describing classes and methods, as well as the classes and methods themselves.

FYI: The permanent gen is not considered a part of the Java heap.

How does the three generations interact/relate to each other? Objects(except the large ones) are first allocated to the young generation. If an object remain alive after x no. of garbage collection cycles it gets promoted to the old/tenured gen. Hence we can say that the young gen contains the short lived objects while the old gen contains the objects having a long life. The permanent gen does not interact with the other two generations.

String comparison technique used by Python

Take a look also at How do I sort unicode strings alphabetically in Python? where the discussion is about sorting rules given by the Unicode Collation Algorithm (http://www.unicode.org/reports/tr10/).

To reply to the comment

What? How else can ordering be defined other than left-to-right?

by S.Lott, there is a famous counter-example when sorting French language. It involves accents: indeed, one could say that, in French, letters are sorted left-to-right and accents right-to-left. Here is the counter-example: we have e < é and o < ô, so you would expect the words cote, coté, côte, côté to be sorted as cote < coté < côte < côté. Well, this is not what happens, in fact you have: cote < côte < coté < côté, i.e., if we remove "c" and "t", we get oe < ôe < oé < ôé, which is exactly right-to-left ordering.

And a last remark: you shouldn't be talking about left-to-right and right-to-left sorting but rather about forward and backward sorting.

Indeed there are languages written from right to left and if you think Arabic and Hebrew are sorted right-to-left you may be right from a graphical point of view, but you are wrong on the logical level!

Indeed, Unicode considers character strings encoded in logical order, and writing direction is a phenomenon occurring on the glyph level. In other words, even if in the word ???? the letter shin appears on the right of the lamed, logically it occurs before it. To sort this word one will first consider the shin, then the lamed, then the vav, then the mem, and this is forward ordering (although Hebrew is written right-to-left), while French accents are sorted backwards (although French is written left-to-right).

Is the practice of returning a C++ reference variable evil?

Function as lvalue (aka, returning of non-const references) should be removed from C++. It's terribly unintuitive. Scott Meyers wanted a min() with this behavior.

min(a,b) = 0;  // What???

which isn't really an improvement on

setmin (a, b, 0);

The latter even makes more sense.

I realize that function as lvalue is important for C++ style streams, but it's worth pointing out that C++ style streams are terrible. I'm not the only one that thinks this... as I recall Alexandrescu had a large article on how to do better, and I believe boost has also tried to create a better type safe I/O method.

What is the iPhone 4 user-agent?

iOS 4.3.2's User Agent, which came out this week, is:

Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5

Linux command: How to 'find' only text files?

Here's how I've done it ...

1 . make a small script to test if a file is plain text istext:

#!/bin/bash
[[ "$(file -bi $1)" == *"file"* ]]

2 . use find as before

find . -type f -exec istext {} \; -exec grep -nHi mystring {} \;

Failed to add a service. Service metadata may not be accessible. Make sure your service is running and exposing metadata.`

In my case, on commenting out the

<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>

in the web.config file was throwing "Failed to add a service. Service metadata may not be accessible. Make sure your service is running and exposing metadata".

HTML Input="file" Accept Attribute File Type (CSV)

You can know the correct content-type for any file by just doing the following:

1) Select interested file,

2) And run in console this:

console.log($('.file-input')[0].files[0].type);

You can also set attribute "multiple" for your input to check content-type for several files at a time and do next:

for (var i = 0; i < $('.file-input')[0].files.length; i++){
    console.log($('.file-input')[0].files[i].type);
}

Attribute accept has some problems with multiple attribute and doesn't work correctly in this case.

Using @property versus getters and setters

I feel like properties are about letting you get the overhead of writing getters and setters only when you actually need them.

Java Programming culture strongly advise to never give access to properties, and instead, go through getters and setters, and only those which are actually needed. It's a bit verbose to always write these obvious pieces of code, and notice that 70% of the time they are never replaced by some non-trivial logic.

In Python, people actually care for that kind of overhead, so that you can embrace the following practice :

Do not use getters and setters at first, when if they not needed
Use @property to implement them without changing the syntax of the rest of your code.

How does Git handle symbolic links?

Git just stores the contents of the link (i.e. the path of the file system object that it links to) in a 'blob' just like it would for a normal file. It then stores the name, mode and type (including the fact that it is a symlink) in the tree object that represents its containing directory.

When you checkout a tree containing the link, it restores the object as a symlink regardless of whether the target file system object exists or not.

If you delete the file that the symlink references it doesn't affect the Git-controlled symlink in any way. You will have a dangling reference. It is up to the user to either remove or change the link to point to something valid if needed.

python JSON object must be str, bytes or bytearray, not 'dict

You are passing a dictionary to a function that expects a string.

This syntax:

{"('Hello',)": 6, "('Hi',)": 5}

is both a valid Python dictionary literal and a valid JSON object literal. But loads doesn't take a dictionary; it takes a string, which it then interprets as JSON and returns the result as a dictionary (or string or array or number, depending on the JSON, but usually a dictionary).

If you pass this string to loads:

'''{"('Hello',)": 6, "('Hi',)": 5}'''

then it will return a dictionary that looks a lot like the one you are trying to pass to it.

You could also exploit the similarity of JSON object literals to Python dictionary literals by doing this:

json.loads(str({"('Hello',)": 6, "('Hi',)": 5}))

But in either case you would just get back the dictionary that you're passing in, so I'm not sure what it would accomplish. What's your goal?

How to use lodash to find and return an object from Array?

Import lodash using

$ npm i --save lodash

var _ = require('lodash'); 

var objArrayList = 
    [
         { name: "user1"},
         { name: "user2"}, 
         { name: "user2"}
    ];

var Obj = _.find(objArrayList, { name: "user2" });

// Obj ==> { name: "user2"}

Set value of hidden field in a form using jQuery's ".val()" doesn't work

I had same problem. oddly enough google chrome and possibly others (not sure) did not like

$("#thing").val(0);

input type="hidden" id="thing" name="thing" value="1" />

(no change)

$("#thing").val("0");

input type="hidden" id="thing" name="thing" value="1" />

(no change)

but this works!!!!

$("#thing").val("no");

input type="hidden" id="thing" name="thing" value="no" />

CHANGES!!

$("#thing").val("yes");

input type="hidden" id="thing" name="thing" value="yes" />

CHANGES!!

must be a "string thing"

How to convert ASCII code (0-255) to its corresponding character?

This is an example, which shows that by converting an int to char, one can determine the corresponding character to an ASCII code.

public class sample6
{
    public static void main(String... asf)
    {

        for(int i =0; i<256; i++)
        {
            System.out.println( i + ". " + (char)i);
        }
    }
}

Why are there no ++ and --? operators in Python?

This may be because @GlennMaynard is looking at the matter as in comparison with other languages, but in Python, you do things the python way. It's not a 'why' question. It's there and you can do things to the same effect with x+=. In The Zen of Python, it is given: "there should only be one way to solve a problem." Multiple choices are great in art (freedom of expression) but lousy in engineering.

How do I measure time elapsed in Java?

If you're getting your timestamps from System.currentTimeMillis(), then your time variables should be longs.

Collectors.toMap() keyMapper -- more succinct expression?

List<Person> roster = ...;

Map<String, Person> map = 
    roster
        .stream()
        .collect(
            Collectors.toMap(p -> p.getLast(), p -> p)
        );

that would be the translation, but i havent run this or used the API. most likely you can substitute p -> p, for Function.identity(). and statically import toMap(...)

Sys is undefined

I have been seeing the exact same error today, but it was not a config or direct JavaScript issue.

An external .net project had been updated but the changes not picked up properly in the compilation of the web site. My presumption is that ASP.NET ajax was not able to construct the client representations of the .NET objects properly and so was failing to load correctly.

To resolve, I rebuilt the external project(s), and rebuilt my solution that was experiencing issues. The problem went away.

What does <T> denote in C#

It is a generic type parameter, see Generics documentation.

T is not a reserved keyword. T, or any given name, means a type parameter. Check the following method (just as a simple example).

T GetDefault<T>()
{
    return default(T);
}

Note that the return type is T. With this method you can get the default value of any type by calling the method as:

GetDefault<int>(); // 0
GetDefault<string>(); // null
GetDefault<DateTime>(); // 01/01/0001 00:00:00
GetDefault<TimeSpan>(); // 00:00:00

.NET uses generics in collections, ... example:

List<int> integerList = new List<int>();

This way you will have a list that only accepts integers, because the class is instancited with the type T, in this case int, and the method that add elements is written as:

public class List<T> : ...
{
    public void Add(T item);
}

Some more information about generics.

You can limit the scope of the type T.

The following example only allows you to invoke the method with types that are classes:

void Foo<T>(T item) where T: class
{
}

The following example only allows you to invoke the method with types that are Circle or inherit from it.

void Foo<T>(T item) where T: Circle
{
}

And there is new() that says you can create an instance of T if it has a parameterless constructor. In the following example T will be treated as Circle, you get intellisense...

void Foo<T>(T item) where T: Circle, new()
{
    T newCircle = new T();
}

As T is a type parameter, you can get the object Type from it. With the Type you can use reflection...

void Foo<T>(T item) where T: class
{
    Type type = typeof(T);
}

As a more complex example, check the signature of ToDictionary or any other Linq method.

public static Dictionary<TKey, TSource> ToDictionary<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector);

There isn't a T, however there is TKey and TSource. It is recommended that you always name type parameters with the prefix T as shown above.

You could name TSomethingFoo if you want to.

ARM compilation error, VFP registers used by executable, not object file

This answer may appear at the surface to be unrelated, but there is an indirect cause of this error message.

First, the "Uses VFP register..." error message is directly caused from mixing mfloat-abi=soft and mfloat-abi=hard options within your build. This setting must be consistent for all objects that are to be linked. This fact is well covered in the other answers to this question.

The indirect cause of this error may be due to the Eclipse editor getting confused by a self-inflicted error in the project's ".cproject" file. The Eclipse editor frequently reswizzles file links and sometimes it breaks itself when you make changes to your directory structures or file locations. This can also affect the path settings to your gcc compiler - and only for a subset of your project's files. While I'm not yet sure of exactly what causes this failure, replacing the .cproject file with a backup copy corrected this problem for me. In my case I noticed .java.null.pointer errors after adding an include directory path and started receiving the "VFP register error" messages out of the blue. In the build log I noticed that a different path to the gcc compiler was being used for some of my sources that were local to the workspace, but not all of them!? The two gcc compilers were using different float settings for unknown reasons - hence the VFP register error.

I compared the .cproject settings with a older copy and observed differences in entries for the sources causing the trouble - even though the overriding of project settings was disabled. By replacing the .cproject file with the old version the problem went away, and I'm leaving this answer as a reminder of what happened.

Add single element to array in numpy

a[0] isn't an array, it's the first element of a and therefore has no dimensions.

Try using a[0:1] instead, which will return the first element of a inside a single item array.

Getting Current time to display in Label. VB.net

There are several problems here:

Your assignment is the wrong way round; you're trying to assign a value to DateTime.Now instead of Start
DateTime.Now is a value of type DateTime, not Integer, so the assignment wouldn't work anyway
There's no need to have the Start variable anyway; it's doing no good
total.Text is a property of type String - not DateTime or Integer

(Some of these would only show up at execution time unless you have Option Strict on, which you really should.)

You should use:

total.Text = DateTime.Now.ToString()

... possibly specifying a culture and/or format specifier if you want the result in a particular format.

How to disable all div content

How to disable the contents of a DIV

The CSS pointer-events property alone doesn't disable child elements from scrolling, and it's not supported by IE10 and under for DIV elements (only for SVG). http://caniuse.com/#feat=pointer-events

To disable the contents of a DIV on all browsers.

Javascript:

$("#myDiv")
  .addClass("disable")
  .click(function () {
    return false;
  });

Css:

.disable {
  opacity: 0.4;
}
// Disable scrolling on child elements
.disable div,
.disable textarea {
  overflow: hidden;
}

To disable the contents of a DIV on all browsers, except IE10 and under.

Javascript:

$("#myDiv").addClass("disable");

Css:

.disable {
  // Note: pointer-events not supported by IE10 and under
  pointer-events: none;
  opacity: 0.4;
}
// Disable scrolling on child elements
.disable div,
.disable textarea {
  overflow: hidden;
}

How to perform OR condition in django queryset?

from django.db.models import Q
User.objects.filter(Q(income__gte=5000) | Q(income__isnull=True))

via Documentation

How to add footnotes to GitHub-flavoured Markdown?

Although I am not aware if it's officially documented anywhere, you can do footer notes in Github.

Mark the place where you want to insert footer link with a number enclosed in square brackets, I.E. [1]
On the bottom of the post, make a reference of the numbered marker and followed by a colon and the link, I.E. [1]: http://www.example.com/link1

And once you preview it, it will be rendered as numbered links in the body of the post.

CSS vertical alignment of inline/inline-block elements

Give vertical-align:top; in a & span. Like this:

a, span{
 vertical-align:top;
}

Check this http://jsfiddle.net/TFPx8/10/

How to convert object array to string array in Java

If you want to get a String representation of the objects in your array, then yes, there is no other way to do it.

If you know your Object array contains Strings only, you may also do (instread of calling toString()):

for (int i=0;i<String_Array.length;i++) String_Array[i]= (String) Object_Array[i];

The only case when you could use the cast to String[] of the Object_Array would be if the array it references would actually be defined as String[] , e.g. this would work:

    Object[] o = new String[10];
    String[] s = (String[]) o;

Align DIV to bottom of the page

Nathan Lee's answer is perfect. I just wanted to add something about position:absolute;. If you wanted to use position:absolute; like you had in your code, you have to think of it as pushing it away from one side of the page.

For example, if you wanted your div to be somewhere in the bottom, you would have to use position:absolute; top:500px;. That would push your div 500px from the top of the page. Same rule applies for all other directions.

DEMO

Get all rows from SQLite

I have been looking into the same problem! I think your problem is related to where you identify the variable that you use to populate the ArrayList that you return. If you define it inside the loop, then it will always reference the last row in the table in the database. In order to avoid this, you have to identify it outside the loop:

String name;
if (cursor.moveToFirst()) {

        while (cursor.isAfterLast() == false) {
            name = cursor.getString(cursor
                    .getColumnIndex(countyname));

            list.add(name);
            cursor.moveToNext();
        }
}

Background color in input and text fields

input[type="text"], textarea {

  background-color : #d1d1d1; 

}

Hope that helps :)

Edit: working example, http://jsfiddle.net/C5WxK/

Differences between utf8 and latin1

In latin1 each character is exactly one byte long. In utf8 a character can consist of more than one byte. Consequently utf8 has more characters than latin1 (and the characters they do have in common aren't necessarily represented by the same byte/bytesequence).

How to write log to file

I usually print the logs on screen and write into a file as well. Hope this helps someone.

f, err := os.OpenFile("/tmp/orders.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
    log.Fatalf("error opening file: %v", err)
}
defer f.Close()
wrt := io.MultiWriter(os.Stdout, f)
log.SetOutput(wrt)
log.Println(" Orders API Called")

How do you completely remove Ionic and Cordova installation from mac?

command to remove cordova and ionic

sudo npm uninstall -g ionic

Warning: comparison with string literals results in unspecified behaviour

if (args[i] == "&")

Ok, let's disect what this does.

args is an array of pointers. So, here you are comparing args[i] (a pointer) to "&" (also a pointer). Well, the only way this will every be true is if somewhere you have args[i]="&" and even then, "&" is not guaranteed to point to the same place everywhere.

I believe what you are actually looking for is either strcmp to compare the entire string or your wanting to do if (*args[i] == '&') to compare the first character of the args[i] string to the & character

Generate insert script for selected records?

CREATE PROCEDURE sp_generate_insertscripts
(
    @TABLENAME VARCHAR(MAX),
    @FILTER_CONDITION VARCHAR(MAX)=''   -- where TableId = 5 or some value
)
AS
BEGIN

SET NOCOUNT ON

DECLARE @TABLE_NAME VARCHAR(MAX),
        @CSV_COLUMN VARCHAR(MAX),
        @QUOTED_DATA VARCHAR(MAX),
        @TEXT VARCHAR(MAX),
        @FILTER VARCHAR(MAX) 

SET @TABLE_NAME=@TABLENAME

SELECT @FILTER=@FILTER_CONDITION

SELECT @CSV_COLUMN=STUFF
(
    (
     SELECT ',['+ NAME +']' FROM sys.all_columns 
     WHERE OBJECT_ID=OBJECT_ID(@TABLE_NAME) AND 
     is_identity!=1 FOR XML PATH('')
    ),1,1,''
)

SELECT @QUOTED_DATA=STUFF
(
    (
     SELECT ' ISNULL(QUOTENAME('+NAME+','+QUOTENAME('''','''''')+'),'+'''NULL'''+')+'','''+'+' FROM sys.all_columns 
     WHERE OBJECT_ID=OBJECT_ID(@TABLE_NAME) AND 
     is_identity!=1 FOR XML PATH('')
    ),1,1,''
)

SELECT @TEXT='SELECT ''INSERT INTO '+@TABLE_NAME+'('+@CSV_COLUMN+')VALUES('''+'+'+SUBSTRING(@QUOTED_DATA,1,LEN(@QUOTED_DATA)-5)+'+'+''')'''+' Insert_Scripts FROM '+@TABLE_NAME + @FILTER

--SELECT @CSV_COLUMN AS CSV_COLUMN,@QUOTED_DATA AS QUOTED_DATA,@TEXT TEXT

EXECUTE (@TEXT)

SET NOCOUNT OFF

END

How are cookies passed in the HTTP protocol?

create example script as resp :

#!/bin/bash

http_code=200
mime=text/html

echo -e "HTTP/1.1 $http_code OK\r"
echo "Content-type: $mime"
echo
echo "Set-Cookie: name=F"

then make executable and execute like this.

./resp | nc -l -p 12346

open browser and browse URL: http://localhost:1236 you will see Cookie value which is sent by Browser

    [aaa@bbbbbbbb ]$ ./resp | nc -l -p 12346
    GET / HTTP/1.1
    Host: xxx.xxx.xxx.xxx:12346
    Connection: keep-alive
    Cache-Control: max-age=0
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
    Upgrade-Insecure-Requests: 1
    User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
    Accept-Encoding: gzip, deflate, sdch
    Accept-Language: en-US,en;q=0.8,ru;q=0.6
    Cookie: name=F

Commenting code in Notepad++

In your n++ editor, you can go to Setting > Shortcut mapper and find all shortcut information as well as you can edit them :)

Change drive in git bash for windows

In order to navigate to a different drive just use

cd /E/Study/Codes

It will solve your problem.

Print a list of space-separated elements in Python 3

Joining elements in a list space separated:

word = ["test", "crust", "must", "fest"]
word.reverse()
joined_string = ""
for w in word:
   joined_string = w + joined_string + " "
print(joined_string.rstrim())

Creating a new directory in C

You can use mkdir:

$ man 2 mkdir

#include <sys/stat.h>
#include <sys/types.h>

int result = mkdir("/home/me/test.txt", 0777);

"SDK Platform Tools component is missing!"

The latest version of the Android SDK ships with two different applications: an SDK Manager and an AVD Manager rather than one single app that was valid when this question was originally asked.

My particular problem was unrelated to the other suggestions. I'm on a network at the moment where HTTPS traffic is mostly disallowed. In order to install the Android Platform Tools I needed to turn on the option to "Force https://... sources to be fetched using http://..." and then this allowed me to install the other tools.

Changing EditText bottom line color with appcompat v7

If you are using appcompat-v7:22.1.0+ you can use the DrawableCompat to tint your widgets

    public static void tintWidget(View view, int color) {
        Drawable wrappedDrawable = DrawableCompat.wrap(view.getBackground());
        DrawableCompat.setTint(wrappedDrawable.mutate(), getResources().getColor(color));
        view.setBackgroundDrawable(wrappedDrawable);
    }

How to extract request http headers from a request using NodeJS connect

To see a list of HTTP request headers, you can use :

console.log(JSON.stringify(req.headers));

to return a list in JSON format.

{
"host":"localhost:8081",
"connection":"keep-alive",
"cache-control":"max-age=0",
"accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
"upgrade-insecure-requests":"1",
"user-agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.107 Safari/537.36",
"accept-encoding":"gzip, deflate, sdch",
"accept-language":"en-US,en;q=0.8,et;q=0.6"
}

Import functions from another js file. Javascript

You can try as follows:

//------ js/functions.js ------
export function square(x) {
    return x * x;
}
export function diag(x, y) {
    return sqrt(square(x) + square(y));
}

//------ js/main.js ------
import { square, diag } from './functions.js';
console.log(square(11)); // 121
console.log(diag(4, 3)); // 5

You can also import completely:

//------ js/main.js ------
import * as lib from './functions.js';
console.log(lib.square(11)); // 121
console.log(lib.diag(4, 3)); // 5

Normally we use ./fileName.js for importing own js file/module and fileName.js is used for importing package/library module

When you will include the main.js file to your webpage you must set the type="module" attribute as follows:

<script type="module" src="js/main.js"></script>

For more details please check ES6 modules

What is Haskell used for in the real world?

From the Haskell Wiki:

Haskell has a diverse range of use commercially, from aerospace and defense, to finance, to web startups, hardware design firms and lawnmower manufacturers. This page collects resources on the industrial use of Haskell.

According to Wikipedia, the Haskell language was created out of the need to consolidate existing functional languages into a common one which could be used for future research in functional-language design.

It is apparent based on the information available that it has outgrown it's original purpose and is used for much more than research. It is now considered a general purpose functional programming language.

If you're still asking yourself, "Why should I use it?", then read the Why use it? section of the Haskell Wiki Introduction.

Installing ADB on macOS

Note that if you use Android Studio and download through its SDK Manager, the SDK is downloaded to ~/Library/Android/sdk by default, not ~/.android-sdk-macosx.

I would rather add this as a comment to @brismuth's excellent answer, but it seems I don't have enough reputation points yet.

How do I echo and send console output to a file in a bat script?

I like atn's answer, but it was not as trivial for me to download as wintee, which is also open source and only gives the tee functionality (useful if you just want tee and not the entire set of unix utilities). I learned about this from davor's answer to Displaying Windows command prompt output and redirecting it to a file, where you also find reference to the unix utilities.

new DateTime() vs default(DateTime)

The simpliest way to understand it is that DateTime is a struct. When you initialize a struct it's initialize to it's minimum value : DateTime.Min

Therefore there is no difference between default(DateTime) and new DateTime() and DateTime.Min

Using true and false in C

I prefer the third solution, i.e. using 1 and 0, because it is particularly useful when you have to test if a condition is true or false: you can simply use a variable for the if argument.
If you use other methods, I think that, to be consistent with the rest of the code, I should use a test like this:

if (variable == TRUE)
{
   ...
}

instead of:

if (variable)
{
   ...
}

How to determine tables size in Oracle

If you don't have DBA rights then you can use user_segments table:

select bytes/1024/1024 MB from user_segments where segment_name='Table_name'

How to debug a bash script?

I built a Bash debugger. Just give it a try. I hope it will help https://sourceforge.net/projects/bashdebugingbash

SmartGit Installation and Usage on Ubuntu

What it correct way of installing SmartGit on Ubuntu? Thus I can have normal icon

In smartgit/bin folder, there's a shell script waiting for you: add-menuitem.sh. It does just that.

Eclipse IDE for Java - Full Dark Theme

If you are in ubuntu 12+ get compiz settings manager, in accessibility enable negative, set the shortcuts. The default is super+n. Now make eclipse be in focus and press the super+n or the key you set it as. This will apply negative filter on eclipse.

HttpWebRequest-The remote server returned an error: (400) Bad Request

Are you sure you should be using POST not PUT?

POST is usually used with application/x-www-urlencoded formats. If you are using a REST API, you should maybe be using PUT? If you are uploading a file you probably need to use multipart/form-data. Not always, but usually, that is the right thing to do..

Also you don't seem to be using the credentials to log in - you need to use the Credentials property of the HttpWebRequest object to send the username and password.

How to prevent going back to the previous activity?

My suggestion would be to finish the activity that you don't want the users to go back to. For instance, in your sign in activity, right after you call startActivity, call finish(). When the users hit the back button, they will not be able to go to the sign in activity because it has been killed off the stack.

How can I resolve the error "The security token included in the request is invalid" when running aws iam upload-server-certificate?

In my situation, the problem was due to running powershell as an admin, so it was looking for the aws credentials in the root of my admin user. There's probably a better way to resolve this, but what worked quickly for me was recreating my .aws folder in the root of my admin user.

HTML form with two submit buttons and two "target" attributes

HTML:

<form method="get">
<input type="text" name="id" value="123"/>
<input type="submit" name="action" value="add"/>
<input type="submit" name="action" value="delete"/>
</form>

JS:

$('form').submit(function(ev){ 
ev.preventDefault();
console.log('clicked',ev.originalEvent,ev.originalEvent.explicitOriginalTarget) 
})

http://jsfiddle.net/arzo/unhc3/

Good ways to sort a queryset? - Django

Here's a way that allows for ties for the cut-off score.

author_count = Author.objects.count()
cut_off_score = Author.objects.order_by('-score').values_list('score')[min(30, author_count)]
top_authors = Author.objects.filter(score__gte=cut_off_score).order_by('last_name')

You may get more than 30 authors in top_authors this way and the min(30,author_count) is there incase you have fewer than 30 authors.

How to access the elements of a function's return array?

<?php
function demo($val,$val1){
    return $arr=array("value"=>$val,"value1"=>$val1);

}
$arr_rec=demo(25,30);
echo $arr_rec["value"];
echo $arr_rec["value1"];
?>

How can I implement static methods on an interface?

How to set the context path of a web application in Tomcat 7.0

For me both answers worked.

Adding a file called ROOT.xml in /conf/Catalina/localhost/

<Context
    docBase="/tmp/wars/hpong"
  path=""
  reloadable="true"
/>

Adding entry in server.xml

<Service name="Catalina2">
    <Connector port="8070" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8743" />
    <Engine name="Catalina2" defaultHost="localhost">
        <Host name="localhost"
            unpackWARs="true" autoDeploy="true">
            <Context path="" docBase="/tmp/wars/hpong"  reloadable="true">
                <WatchedResource>WEB-INF/web.xml</WatchedResource>
            </Context>
      </Host>
    </Engine>
</Service>

Note: when you declare docBase under context then ignore appBase at Host.

However I have preferred converting my war name as ROOT.war and place it under webapps. So now unmatched url requests from other wars(contextpaths) will land into this war. This is better way to handle ROOT ("/**") context path.

The second option is (double) loading the wars from Webapps folder as well. Also it only needs uncompressed war folder which is a headache.

NGINX to reverse proxy websockets AND enable SSL (wss://)?

If you want to add SSL in your test environment, then you can use mkcert. Below I mentioned the GitHub URL.
https://github.com/FiloSottile/mkcert
And also below I mentioned sample nginx configuration for reverse proxy.

server {
        listen 80;
        server_name test.local;
        return 301 https://test.local$request_uri;
}
server {
  listen 443 ssl;
  server_name test.local;
  ssl_certificate /etc/nginx/ssl/test.local.pem;
  ssl_certificate_key /etc/nginx/ssl/test.local-key.pem;

   location / {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $remote_addr;
      proxy_set_header X-Client-Verify SUCCESS;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_pass http://localhost:3000;
      proxy_redirect off;
      proxy_buffering off;
    }
}

How to convert unix timestamp to calendar date moment.js

UNIX timestamp it is count of seconds from 1970, so you need to convert it to JS Date object:

var date = new Date(unixTimestamp*1000);

Named colors in matplotlib

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

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

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

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

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


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

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

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

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

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

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

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

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

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

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

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

Additional named colors

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

xkcd

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

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

Now you have access to a plethora of named colors!

Tableau

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

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

There are ten distinct colors:

HTML

You can also plot colors by their HTML hex code:

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

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

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

Create ArrayList from array

Simplest way to do so is by adding following code. Tried and Tested.

String[] Array1={"one","two","three"};
ArrayList<String> s1= new ArrayList<String>(Arrays.asList(Array1));

How to print variables in Perl

How do I print out my $ids and $nIds?

print "$ids\n";
print "$nIds\n";

I tried simply print $ids, but Perl complains.

Complains about what? Uninitialised value? Perhaps your loop was never entered due to an error opening the file. Be sure to check if open returned an error, and make sure you are using use strict; use warnings;.

my ($ids, $nIds) is a list, right? With two elements?

It's a (very special) function call. $ids,$nIds is a list with two elements.

jQuery animated number counter from zero to value

What the code does, is that the number 8000 is counting up from 0 to 8000. The problem is, that it is placed at the middle of quite long page, and once user scroll down and actually see the number, the animation is already dine. I would like to trigger the counter, once it appears in the viewport.

JS:

$('.count').each(function () {
                $(this).prop('Counter',0).animate({
                        Counter: $(this).text()
                }, {
                        duration: 4000,
                        easing: 'swing',
                        step: function (now) {
                                $(this).text(Math.ceil(now));
                        }
                });
            });

And HTML:

 <span class="count">8000</span>

What bitrate is used for each of the youtube video qualities (360p - 1080p), in regards to flowplayer?

Looking at this official google link: Youtube Live encoder settings, bitrates and resolutions they have this table:

                   240p       360p        480p        720p        1080p
Resolution      426 x 240   640 x 360   854x480     1280x720    1920x1080
Video Bitrates                   
Maximum         700 Kbps    1000 Kbps   2000 Kbps   4000 Kbps   6000 Kbps
Recommended     400 Kbps    750 Kbps    1000 Kbps   2500 Kbps   4500 Kbps
Minimum         300 Kbps    400 Kbps    500 Kbps    1500 Kbps   3000 Kbps

It would appear as though this is the case, although the numbers dont sync up to the google table above:

// the bitrates, video width and file names for this clip
      bitrates: [
        { url: "bbb-800.mp4", width: 480, bitrate: 800 }, //360p video
        { url: "bbb-1200.mp4", width: 720, bitrate: 1200 }, //480p video
        { url: "bbb-1600.mp4", width: 1080, bitrate: 1600 } //720p video
      ],

Unable to compile simple Java 10 / Java 11 project with Maven

As of 30Jul, 2018 to fix the above issue, one can configure the java version used within maven to any up to JDK/11 and make use of the maven-compiler-plugin:3.8.0 to specify a release of either 9,10,11 without any explicit dependencies.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <release>11</release>  <!--or <release>10</release>-->
    </configuration>
</plugin>

Note:- The default value for source/target has been lifted from 1.5 to 1.6 with this version. -- release notes.

Edit [30.12.2018]

In fact, you can make use of the same version of maven-compiler-plugin while compiling the code against JDK/12 as well.

More details and a sample configuration in how to Compile and execute a JDK preview feature with Maven.

InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately

If you are not able to upgrade your Python version to 2.7.9, and want to suppress warnings,

you can downgrade your 'requests' version to 2.5.3:

pip install requests==2.5.3

Bugfix disclosure / Warning introduced in 2.6.0

How to ping an IP address

InetAddress.isReachable() according to javadoc:

".. A typical implementation will use ICMP ECHO REQUESTs if the privilege can be obtained, otherwise it will try to establish a TCP connection on port 7 (Echo) of the destination host..".

Option #1 (ICMP) usually requires administrative (root) rights.

How to parse JSON without JSON.NET library?

using System;
using System.IO;
using System.Runtime.Serialization.Json;
using System.Text;

namespace OTL
{
    /// <summary>
    /// Before usage: Define your class, sample:
    /// [DataContract]
    ///public class MusicInfo
    ///{
    ///   [DataMember(Name="music_name")]
    ///   public string Name { get; set; }
    ///   [DataMember]
    ///   public string Artist{get; set;}
    ///}
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class OTLJSON<T> where T : class
    {
        /// <summary>
        /// Serializes an object to JSON
        /// Usage: string serialized = OTLJSON&lt;MusicInfo&gt;.Serialize(musicInfo);
        /// </summary>
        /// <param name="instance"></param>
        /// <returns></returns>
        public static string Serialize(T instance)
        {
            var serializer = new DataContractJsonSerializer(typeof(T));
            using (var stream = new MemoryStream())
            {
                serializer.WriteObject(stream, instance);
                return Encoding.Default.GetString(stream.ToArray());
            }
        }

        /// <summary>
        /// DeSerializes an object from JSON
        /// Usage:  MusicInfo deserialized = OTLJSON&lt;MusicInfo&gt;.Deserialize(json);
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static T Deserialize(string json)
        {
            if (string.IsNullOrEmpty(json))
                throw new Exception("Json can't empty");
            else
                try
                {
                    using (var stream = new MemoryStream(Encoding.Default.GetBytes(json)))
                    {

                        var serializer = new DataContractJsonSerializer(typeof(T));
                        return serializer.ReadObject(stream) as T;
                    }
                }
                catch (Exception e)
                {
                    throw new Exception("Json can't convert to Object because it isn't correct format.");
                }
        }
    }
}

Mercurial undo last commit

Its workaround.

If you not push to server, you will clone into new folder else washout(delete all files) from your repository folder and clone new.

Plotting using a CSV file

You can also plot to a png file using gnuplot (which is free):

terminal commands

gnuplot> set title '<title>'
gnuplot> set ylabel '<yLabel>'
gnuplot> set xlabel '<xLabel>'
gnuplot> set grid
gnuplot> set term png
gnuplot> set output '<Output file name>.png'
gnuplot> plot '<fromfile.csv>'

note: you always need to give the right extension (.png here) at set output

Then it is also possible that the ouput is not lines, because your data is not continues. To fix this simply change the 'plot' line to:

plot '<Fromfile.csv>' with line lt -1 lw 2

More line editing options (dashes and line color ect.) at: http://gnuplot.sourceforge.net/demo_canvas/dashcolor.html

gnuplot is available in most linux distros via the package manager (e.g. on an apt based distro, run apt-get install gnuplot)
gnuplot is available in windows via Cygwin
gnuplot is available on macOS via homebrew (run brew install gnuplot)

Python, add items from txt file into a list

Read the documentation:

with open('names.txt', 'r') as f:
    myNames = f.readlines()

The others already provided answers how to get rid of the newline character.

Update:

Fred Larson provides a nice solution in his comment:

with open('names.txt', 'r') as f:
    myNames = [line.strip() for line in f]

log4net hierarchy and logging levels

For most applications you would like to set a minimum level but not a maximum level.

For example, when debugging your code set the minimum level to DEBUG, and in production set it to WARN.

What is the difference between Normalize.css and Reset CSS?

This question has been answered already several times, I'll short summary for each of them, an example and insights as of September 2019:

Normalize.css - as the name suggests, it normalizes styles in the browsers for their user agents, i.e. makes them the same across all browsers due to the reason by default they're slightly different.

Example: <h1> tag inside <section> by default Google Chrome will make smaller than the "expected" size of <h1> tag. Microsoft Edge on the other hand is making the "expected" size of <h1> tag. Normalize.css will make it consistent.

Current status: the npm repository shows that normalize.css package has currently more than 500k downloads per week. GitHub stars in the project of the repository are more than 36k.

Reset CSS - as the name suggests, it resets all styles, i.e. it removes all browser's user agent styles.

Example: it would do something like that below:

html, body, div, span, ..., audio, video {  
   margin: 0;  
   padding: 0;  
   border: 0;  
   font-size: 100%;  
   font: inherit;  
   vertical-align: baseline; 
}

Current status: it's much less popular than Normalize.css, the reset-css package shows it's something around 26k downloads per week. GitHub stars are only 200, as it can be noticed from the project's repository.

How does true/false work in PHP?

Zero is false, nonzero is true.

In php you can test more explicitly using the === operator.

if (0==false) 
    echo "works"; // will echo works

if (0===false) 
    echo "works"; // will not echo anything

How to SHUTDOWN Tomcat in Ubuntu?

Try using this command : (this will stop tomcat servlet this really helps)

sudo service tomcat7 stop

sudo tomcat7 restart (if you need a restart)

How can I directly view blobs in MySQL Workbench

In short:

Go to Edit > Preferences
Choose SQL Editor
Under SQL Execution, check Treat BINARY/VARBINARY as nonbinary character string
Restart MySQL Workbench (you will not be prompted or informed of this requirement).

In MySQL Workbench 6.0+

Go to Edit > Preferences
Choose SQL Queries
Under Query Results, check Treat BINARY/VARBINARY as nonbinary character string
It's not mandatory to restart MySQL Workbench (you will not be prompted or informed of this requirement).*

With this setting you will be able to concatenate fields without getting blobs.

I think this applies to versions 5.2.22 and later and is the result of this MySQL bug.

Disclaimer: I don't know what the downside of this setting is - maybe when you are selecting BINARY/VARBINARY values you will see it as plain text which may be misleading and/or maybe it will hinder performance if they are large enough?

How do I import a specific version of a package using go get?

Really surprised nobody has mentioned gopkg.in.

gopkg.in is a service that provides a wrapper (redirect) that lets you express versions as repo urls, without actually creating repos. E.g. gopkg.in/yaml.v1 vs gopkg.in/yaml.v2, even though they both live at https://github.com/go-yaml/yaml

gopkg.in/yaml.v1 redirects to https://github.com/go-yaml/yaml/tree/v1
gopkg.in/yaml.v2 redirects to https://github.com/go-yaml/yaml/tree/v2

This isn't perfect if the author is not following proper versioning practices (by incrementing the version number when breaking backwards compatibility), but it does work with branches and tags.

Programs & Examples On #Totem

PHP - get base64 img string decode and save as jpg (resulting empty image )

css - position div to bottom of containing div

Vertical and horizontal align (middle and center) with CSS

How to turn off the Eclipse code formatter for certain sections of Java code?

PHP how to get value from array if key is in a variable

Creating temporary files in bash

Change Twitter Bootstrap Tooltip content on click

How to use WinForms progress bar?

Mockito - NullpointerException when stubbing Method

In java how to get substring from a string till a character c?

Check element exists in array

C# HttpWebRequest of type "application/x-www-form-urlencoded" - how to send '&' character in content body?

Django. Override save for model

How to fully clean bin and obj folders within Visual Studio?

Rails: Get Client IP address

Unpacking a list / tuple of pairs into two lists / tuples

How to pass parameters to ThreadStart method in Thread?

Change language of Visual Studio 2017 RC

how to toggle attr() in jquery

CSS: image link, change on hover

Best way to store date/time in mongodb

How can I remove item from querystring in asp.net using c#?

how to open a jar file in Eclipse

How can I make content appear beneath a fixed DIV element?

How to convert List to Json in Java

android - save image into gallery

Eclipse shows errors but I can't find them

Focus Next Element In Tab Index

On npm install: Unhandled rejection Error: EACCES: permission denied

How can I specify a local gem in my Gemfile?

Support for "border-radius" in IE

Position DIV relative to another DIV?

How do I put variable values into a text string in MATLAB?

How do you count the number of occurrences of a certain substring in a SQL varchar?

What is the Java equivalent for LINQ?

Select multiple columns using Entity Framework

What is the facade design pattern?

HTML-5 date field shows as "mm/dd/yyyy" in Chrome, even when valid date is set

What does '&' do in a C++ declaration?

C# Copy a file to another location with a different name

Javascript decoding html entities

How can I set the initial value of Select2 when using AJAX?

A column-vector y was passed when a 1d array was expected

Is it possible to set a timeout for an SQL query on Microsoft SQL server?

Spark - repartition() vs coalesce()

Array of an unknown length in C#

Python idiom to return first item or None

Why would Oracle.ManagedDataAccess not work when Oracle.DataAccess does?

MySQL VARCHAR size?

Pass entire form as data in jQuery Ajax function

Should CSS always preceed Javascript?

Can you force Vue.js to reload/re-render?

SOAP vs REST (differences)

Curl and PHP - how can I pass a json through curl by PUT,POST,GET

How do I verify that a string only contains letters, numbers, underscores and dashes?

Inserting records into a MySQL table using Java

Awaiting multiple Tasks with different results

How do I pass JavaScript variables to PHP?

What is the difference between bottom-up and top-down?

Store List to session

round value to 2 decimals javascript

Angular ng-if="" with multiple arguments

Create a menu Bar in WPF?

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

Authentication plugin 'caching_sha2_password' cannot be loaded

PHP Deprecated: Methods with the same name

Is there a way to 'uniq' by column?

Passing HTML to template using Flask/Jinja2

How to represent a fix number of repeats in regular expression?

References

Related questions

How to test if a list contains another list?

Python list directory, subdirectory, and files

Reading Xml with XmlReader in C#

Convert Pandas DataFrame to JSON format

Matplotlib tight_layout() doesn't take into account figure suptitle

Virtualhost For Wildcard Subdomain and Static Subdomain

How to add lines to end of file on Linux

MySQL: Can't create table (errno: 150)