Maven 3 and JUnit 4 compilation problem: package org.junit does not exist

removing the scope tag in pom.xml for junit worked..

The type java.lang.CharSequence cannot be resolved in package declaration

Java 8 supports default methods in interfaces. And in JDK 8 a lot of old interfaces now have new default methods. For example, now in CharSequence we have chars and codePoints methods.
If source level of your project is lower than 1.8, then compiler doesn't allow you to use default methods in interfaces. So it cannot compile classes that directly on indirectly depend on this interfaces.
If I get your problem right, then you have two solutions. First solution is to rollback to JDK 7, then you will use old CharSequence interface without default methods. Second solution is to set source level of your project to 1.8, then your compiler will not complain about default methods in interfaces.

Can I remove the URL from my print css, so the web address doesn't print?

In Firefox, https://bug743252.bugzilla.mozilla.org/attachment.cgi?id=714383 (view page source :: tag HTML).

In your code, replace <html> with <html moznomarginboxes mozdisallowselectionprint>.

In others browsers, I don't know, but you can view http://www.mintprintables.com/print-tips/header-footer-windows/

How to convert string to XML using C#

string test = "<body><head>test header</head></body>";

XmlDocument xmltest = new XmlDocument();
xmltest.LoadXml(test);

XmlNodeList elemlist = xmltest.GetElementsByTagName("head");

string result = elemlist[0].InnerXml; 

//result -> "test header"

JWT (JSON Web Token) library for Java

JJWT aims to be the easiest to use and understand JWT library for the JVM and Android:

https://github.com/jwtk/jjwt

What is the command for cut copy paste a file from one directory to other directory

use the xclip which is command line interface to X selections

install

apt-get install xclip

usage

echo "test xclip " > /tmp/test.xclip
xclip -i < /tmp/test.xclip
xclip -o > /tmp/test.xclip.out

cat /tmp/test.xclip.out   # "test xclip"

enjoy.

Does Hive have a String split function?

Just a clarification on the answer given by Bkkbrad.

I tried this suggestion and it did not work for me.

For example,

split('aa|bb','\\|')

produced:

["","a","a","|","b","b",""]

But,

split('aa|bb','[|]')

produced the desired result:

["aa","bb"]

Including the metacharacter '|' inside the square brackets causes it to be interpreted literally, as intended, rather than as a metacharacter.

For elaboration of this behaviour of regexp, see: http://www.regular-expressions.info/charclass.html

Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user

New location for mysql config file is

/etc/mysql/mysql.conf.d/mysqld.cnf

Why is Chrome showing a "Please Fill Out this Field" tooltip on empty fields?

Are you using the HTML5 required attribute?

That will cause Chrome 10 to display a balloon prompting the user to fill out the field.

How to calculate the inverse of the normal cumulative distribution function in python?

# given random variable X (house price) with population muy = 60, sigma = 40
import scipy as sc
import scipy.stats as sct
sc.version.full_version # 0.15.1

#a. Find P(X<50)
sct.norm.cdf(x=50,loc=60,scale=40) # 0.4012936743170763

#b. Find P(X>=50)
sct.norm.sf(x=50,loc=60,scale=40) # 0.5987063256829237

#c. Find P(60<=X<=80)
sct.norm.cdf(x=80,loc=60,scale=40) - sct.norm.cdf(x=60,loc=60,scale=40)

#d. how much top most 5% expensive house cost at least? or find x where P(X>=x) = 0.05
sct.norm.isf(q=0.05,loc=60,scale=40)

#e. how much top most 5% cheapest house cost at least? or find x where P(X<=x) = 0.05
sct.norm.ppf(q=0.05,loc=60,scale=40)

setting system property

System.setProperty("gate.home", "/some/directory");

After that you can retrieve its value later by calling

String value =  System.getProperty("gate.home");

Bootstrap dropdown menu not working (not dropping down when clicked)

Just add both these files after opening of body tag. Keep in mind 'Only after Body tag' any where after body tag. If you add below mentioned files inside body tag then your problems would still be unresolved.

So paste them after or before close of body tag... This works 100%. I've tested and got it working!

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
 <!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>

Coerce multiple columns to factors at once

You can use mutate_if (dplyr):

For example, coerce integer in factor:

mydata=structure(list(a = 1:10, b = 1:10, c = c("a", "a", "b", "b", 
"c", "c", "c", "c", "c", "c")), row.names = c(NA, -10L), class = c("tbl_df", 
"tbl", "data.frame"))

# A tibble: 10 x 3
       a     b c    
   <int> <int> <chr>
 1     1     1 a    
 2     2     2 a    
 3     3     3 b    
 4     4     4 b    
 5     5     5 c    
 6     6     6 c    
 7     7     7 c    
 8     8     8 c    
 9     9     9 c    
10    10    10 c

Use the function:

library(dplyr)

mydata%>%
    mutate_if(is.integer,as.factor)

# A tibble: 10 x 3
       a     b c    
   <fct> <fct> <chr>
 1     1     1 a    
 2     2     2 a    
 3     3     3 b    
 4     4     4 b    
 5     5     5 c    
 6     6     6 c    
 7     7     7 c    
 8     8     8 c    
 9     9     9 c    
10    10    10 c

How Can I Set the Default Value of a Timestamp Column to the Current Timestamp with Laravel Migrations?

To create both of the created_at and updated_at columns:

$t->timestamp('created_at')->default(DB::raw('CURRENT_TIMESTAMP'));
$t->timestamp('updated_at')->default(DB::raw('CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP'));

You will need MySQL version >= 5.6.5 to have multiple columns with CURRENT_TIMESTAMP

How to detect if CMD is running as Administrator/has elevated privileges?

ADDENDUM: For Windows 8 this will not work; see this excellent answer instead.

Found this solution here: http://www.robvanderwoude.com/clevertricks.php

AT > NUL
IF %ERRORLEVEL% EQU 0 (
    ECHO you are Administrator
) ELSE (
    ECHO you are NOT Administrator. Exiting...
    PING 127.0.0.1 > NUL 2>&1
    EXIT /B 1
)

Assuming that doesn't work and since we're talking Win7 you could use the following in Powershell if that's suitable:

$principal = new-object System.Security.Principal.WindowsPrincipal([System.Security.Principal.WindowsIdentity]::GetCurrent())
$principal.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator)

If not (and probably not, since you explicitly proposed batch files) then you could write the above in .NET and return an exit code from an exe based on the result for your batch file to use.

animating addClass/removeClass with jQuery

You just need the jQuery UI effects-core (13KB), to enable the duration of the adding (just like Omar Tariq it pointed out)

How do I check if a variable is of a certain type (compare two types) in C?

This is crazily stupid, but if you use the code:

fprintf("%x", variable)

and you use the -Wall flag while compiling, then gcc will kick out a warning of that it expects an argument of 'unsigned int' while the argument is of type '____'. (If this warning doesn't appear, then your variable is of type 'unsigned int'.)

Best of luck!

Edit: As was brought up below, this only applies to compile time. Very helpful when trying to figure out why your pointers aren't behaving, but not very useful if needed during run time.

How can I show three columns per row?

Try this one using Grid Layout:

_x000D_

.grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: auto auto auto;_x000D_
  padding: 10px;_x000D_
}_x000D_
.grid-item {_x000D_
  background-color: rgba(255, 255, 255, 0.8);_x000D_
  border: 1px solid rgba(0, 0, 0, 0.8);_x000D_
  padding: 20px;_x000D_
  font-size: 30px;_x000D_
  text-align: center;_x000D_
}

_x000D_

<div class="grid-container">_x000D_
  <div class="grid-item">1</div>_x000D_
  <div class="grid-item">2</div>_x000D_
  <div class="grid-item">3</div>  _x000D_
  <div class="grid-item">4</div>_x000D_
  <div class="grid-item">5</div>_x000D_
  <div class="grid-item">6</div>  _x000D_
  <div class="grid-item">7</div>_x000D_
  <div class="grid-item">8</div>_x000D_
  <div class="grid-item">9</div>  _x000D_
</div>

_x000D_

How do I set up HttpContent for my HttpClient PostAsync second parameter?

To add to Preston's answer, here's the complete list of the HttpContent derived classes available in the standard library:

Credit: https://pfelix.wordpress.com/2012/01/16/the-new-system-net-http-classes-message-content/

There's also a supposed ObjectContent but I was unable to find it in ASP.NET Core.

Of course, you could skip the whole HttpContent thing all together with Microsoft.AspNet.WebApi.Client extensions (you'll have to do an import to get it to work in ASP.NET Core for now: https://github.com/aspnet/Home/issues/1558) and then you can do things like:

var response = await client.PostAsJsonAsync("AddNewArticle", new Article
{
    Title = "New Article Title",
    Body = "New Article Body"
});

Spring,Request method 'POST' not supported

You are missimg @ModelAttribute annotation for UserProfessionalForm professionalForm parameter in forgotPassword method.

@RequestMapping(value = "proffessional", method = RequestMethod.POST)
public @ResponseBody
String forgotPassword(@ModelAttribute UserProfessionalForm professionalForm,
        BindingResult result, Model model) {

    UserProfileVO userProfileVO = new UserProfileVO();
    userProfileVO.setUser(sessionData.getUser());
    userService.saveUserProfile(userProfileVO);
    model.addAttribute("professional", professionalForm);
    return "Your Professional Details Updated";
}

'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension method

if you unable to find assembly reference from when (Right click on reference ->add required assembly)

try this Package manager console
Install-Package System.Net.Http.Formatting.Extension -Version 5.2.3 and then add by using add reference .

Formula to check if string is empty in Crystal Reports

You can check for IsNull condition.

If IsNull({TABLE.FIELD}) or {TABLE.FIELD} = "" then
  // do something

Multiple actions were found that match the request in Web Api

After a lot of searching the web and trying to find the most suitable form for routing map if have found the following

config.Routes.MapHttpRoute("DefaultApiWithId", "Api/{controller}/{id}", new { id =RouteParameter.Optional }, new { id = @"\d+" });
config.Routes.MapHttpRoute("DefaultApiWithAction", "Api/{controller}/{action}");

These mapping applying to both action name mapping and basic http convention (GET,POST,PUT,DELETE)

Getting the location from an IP address

Assuming you want to do it yourself and not rely upon other providers, IP2Nation provides a MySQL database of the mappings which are updated as the regional registries change things around.

How to change a TextView's style at runtime

See doco for setText() in TextView http://developer.android.com/reference/android/widget/TextView.html

To style your strings, attach android.text.style.* objects to a SpannableString, or see the Available Resource Types documentation for an example of setting formatted text in the XML resource file.

Lightweight XML Viewer that can handle large files

I like Microsoft's XML Notepad 2007, but I don't know how it handles very large files, sorry.

python catch exception and continue try block

You could iterate through your methods...

for m in [do_smth1, do_smth2]:
    try:
        m()
    except:
        pass

How to open remote files in sublime text 3

You can use these plugins;

Sublime SFTP

sublime FTPSync

Accept server's self-signed ssl certificate in Java client

You have basically two options here: add the self-signed certificate to your JVM truststore or configure your client to

Option 1

Export the certificate from your browser and import it in your JVM truststore (to establish a chain of trust):

<JAVA_HOME>\bin\keytool -import -v -trustcacerts
-alias server-alias -file server.cer
-keystore cacerts.jks -keypass changeit
-storepass changeit

Option 2

Disable Certificate Validation:

// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[] { 
    new X509TrustManager() {     
        public java.security.cert.X509Certificate[] getAcceptedIssuers() { 
            return new X509Certificate[0];
        } 
        public void checkClientTrusted( 
            java.security.cert.X509Certificate[] certs, String authType) {
            } 
        public void checkServerTrusted( 
            java.security.cert.X509Certificate[] certs, String authType) {
        }
    } 
}; 

// Install the all-trusting trust manager
try {
    SSLContext sc = SSLContext.getInstance("SSL"); 
    sc.init(null, trustAllCerts, new java.security.SecureRandom()); 
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (GeneralSecurityException e) {
} 
// Now you can access an https URL without having the certificate in the truststore
try { 
    URL url = new URL("https://hostname/index.html"); 
} catch (MalformedURLException e) {
}

Note that I do not recommend the Option #2 at all. Disabling the trust manager defeats some parts of SSL and makes you vulnerable to man in the middle attacks. Prefer Option #1 or, even better, have the server use a "real" certificate signed by a well known CA.

How do I fetch only one branch of a remote Git repository?

git version 2.16.1.windows.4

Just doing a git fetch remoteRepositoryName branchName (eg: git fetch origin my_local_branch) is enough. Fetch will be done and a new local branch will be created with the same name and tracking will be set to remote branch.

Then perform git checkout branchName

How to create an exit message

I got here searching for a way to execute some code whenever the program ends.
Found this:

Kernel.at_exit { puts "sayonara" }
# do whatever
# [...]
# call #exit or #abort or just let the program end
# calling #exit! will skip the call

Called multiple times will register multiple handlers.

Reset input value in angular 2

I know this is an old thread but I just stumbled across.

So heres how I would do it, with your local template variable on the input field you can set the value of the input like below

<input mdInput placeholder="Name" #filterName name="filterName" >

@ViewChild() input: ElementRef

public clear() {
    this.input.NativeElement.value = '';
}

Pretty sure this will not set the form back to pristine but you can then reset this in the same function using the markAsPristine() function

Javascript Click on Element by Class

If you want to click on all elements selected by some class, you can use this example (used on last.fm on the Loved tracks page to Unlove all).

var divs = document.querySelectorAll('.love-button.love-button--loved'); 

for (i = 0; i < divs.length; ++i) {
  divs[i].click();
};

With ES6 and Babel (cannot be run in the browser console directly)

[...document.querySelectorAll('.love-button.love-button--loved')]
   .forEach(div => { div.click(); })

TypeError: no implicit conversion of Symbol into Integer

You probably meant this:

require 'active_support/core_ext' # for titleize

myHash = {company_name:"MyCompany", street:"Mainstreet", postcode:"1234", city:"MyCity", free_seats:"3"}

def cleanup string
  string.titleize
end

def format(hash)
  output = {}
  output[:company_name] = cleanup(hash[:company_name])
  output[:street] = cleanup(hash[:street])
  output
end

format(myHash) # => {:company_name=>"My Company", :street=>"Mainstreet"}

Please read documentation on Hash#each

How can I recover the return value of a function passed to multiprocessing.Process?

A simple solution:

import multiprocessing

output=[]
data = range(0,10)

def f(x):
    return x**2

def handler():
    p = multiprocessing.Pool(64)
    r=p.map(f, data)
    return r

if __name__ == '__main__':
    output.append(handler())

print(output[0])

Output:

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

How to join two sets in one line without using "|"

Suppose you have 2 lists

 A = [1,2,3,4]
 B = [3,4,5,6]

so you can find A Union B as follow

 union = set(A).union(set(B))

also if you want to find intersection and non-intersection you do that as follow

 intersection = set(A).intersection(set(B))
 non_intersection = union - intersection

Extension mysqli is missing, phpmyadmin doesn't work

For Ubuntu 20.04 users with php-fpm I fixed the issue by adding the full path in the php conf:

edit /etc/php/7.4/fpm/conf.d/20-mysqli.ini

and replace

extension=mysqli.so

with:

extension=/usr/lib/php/20190902/mysqli.so

insert data into database using servlet and jsp in eclipse

Same problem fetch main problem in PreparedStatement use simple statement then you successfully insert record same use below.

String  st2="insert into 
user(gender,name,address,telephone,fax,email,
     destination,sdate,edate,Participant,hcategory,
     Culture,Nature,People,Cities,Beaches,Festivals,username,password) 
values('"+gender+"','"+name+"','"+address+"','"+phone+"','"+fax+"',
       '"+email+"','"+desti+"','"+sdate+"','"+edate+"','"+parti+"',
       '"+hotel+"','"+chk1+"','"+chk2+"','"+chk3+"','"+chk4+"',
       '"+chk5+"','"+chk6+"','"+user+"','"+password+"')";


int i=stm.executeUpdate(st2);

getApplication() vs. getApplicationContext()

It seems to have to do with context wrapping. Most classes derived from Context are actually a ContextWrapper, which essentially delegates to another context, possibly with changes by the wrapper.

The context is a general abstraction that supports mocking and proxying. Since many contexts are bound to a limited-lifetime object such as an Activity, there needs to be a way to get a longer-lived context, for purposes such as registering for future notifications. That is achieved by Context.getApplicationContext(). A logical implementation is to return the global Application object, but nothing prevents a context implementation from returning a wrapper or proxy with a suitable lifetime instead.

Activities and services are more specifically associated with an Application object. The usefulness of this, I believe, is that you can create and register in the manifest a custom class derived from Application and be certain that Activity.getApplication() or Service.getApplication() will return that specific object of that specific type, which you can cast to your derived Application class and use for whatever custom purpose.

In other words, getApplication() is guaranteed to return an Application object, while getApplicationContext() is free to return a proxy instead.

How to insert current_timestamp into Postgres via python

from datetime import datetime as dt

then use this in your code:

cur.execute('INSERT INTO my_table (dt_col) VALUES (%s)', (dt.now(),))

jQuery deferreds and promises - .then() vs .done()

then() always means it will be called in whatever case. But the parameters passing are different in different jQuery versions.

Prior to jQuery 1.8, then() equals done().fail(). And all of the callback functions share same parameters.

But as of jQuery 1.8, then() returns a new promise, and if it has return a value, it will be passed into the next callback function.

Let's see the following example:

var defer = jQuery.Deferred();

defer.done(function(a, b){
            return a + b;
}).done(function( result ) {
            console.log("result = " + result);
}).then(function( a, b ) {
            return a + b;
}).done(function( result ) {
            console.log("result = " + result);
}).then(function( a, b ) {
            return a + b;
}).done(function( result ) {
            console.log("result = " + result);
});

defer.resolve( 3, 4 );

Prior to jQuery 1.8, the answer should be

result = 3
result = 3
result = 3

All result takes 3. And then() function always passes the same deferred object to the next function.

But as of jQuery 1.8, the result should be:

result = 3
result = 7
result = NaN

Because the first then() function returns a new promise, and the value 7 (and this is the only parameter that will passed on)is passed to the next done(), so the second done() write result = 7. The second then() takes 7 as the value of a and takes undefined as the value of b, so the second then() returns a new promise with the parameter NaN, and the last done() prints NaN as its result.

COALESCE with Hive SQL

From Language DDL & UDF of Hive

NVL(value, default value)

Returns default value if value is null else returns value

Get bottom and right position of an element

// Returns bottom offset value + or - from viewport top
function offsetBottom(el, i) { i = i || 0; return $(el)[i].getBoundingClientRect().bottom }

// Returns right offset value
function offsetRight(el, i) { i = i || 0; return $(el)[i].getBoundingClientRect().right }

var bottom = offsetBottom('#logo');
var right = offsetRight('#logo');

This will find the distance from the top and left of your viewport to your element's exact edge and nothing beyond that. So say your logo was 350px and it had a left margin of 50px, variable 'right' will hold a value of 400 because that's the actual distance in pixels it took to get to the edge of your element, no matter if you have more padding or margin to the right of it.

If your box-sizing CSS property is set to border-box it will continue to work just as if it were set as the default content-box.

How do you find what version of libstdc++ library is installed on your linux machine?

What exactly do you want to know?

The shared library soname? That's part of the filename, libstdc++.so.6, or shown by readelf -d /usr/lib64/libstdc++.so.6 | grep soname.

The minor revision number? You should be able to get that by simply checking what the symlink points to:

$ ls -l  /usr/lib/libstdc++.so.6
lrwxrwxrwx. 1 root root 19 Mar 23 09:43 /usr/lib/libstdc++.so.6 -> libstdc++.so.6.0.16

That tells you it's 6.0.16, which is the 16th revision of the libstdc++.so.6 version, which corresponds to the GLIBCXX_3.4.16 symbol versions.

Or do you mean the release it comes from? It's part of GCC so it's the same version as GCC, so unless you've screwed up your system by installing unmatched versions of g++ and libstdc++.so you can get that from:

$ g++ -dumpversion
4.6.3

Or, on most distros, you can just ask the package manager. On my Fedora host that's

$ rpm -q libstdc++
libstdc++-4.6.3-2.fc16.x86_64
libstdc++-4.6.3-2.fc16.i686

As other answers have said, you can map releases to library versions by checking the ABI docs

How to bring view in front of everything?

Arrange them in the order you wants to show. Suppose, you wanna show view 1 on top of view 2. Then write view 2 code then write view 1 code. If you cant does this ordering, then call bringToFront() to the root view of the layout you wants to bring in front.

How do I reference the input of an HTML <textarea> control in codebehind?

You should reference the textarea ID and include the runat="server" attribute to the textarea

message.Body = TextArea1.Text;

What is test123?

How do I "commit" changes in a git submodule?

Before you can commit and push, you need to init a working repository tree for a submodule. I am using tortoise and do following things:

First check if there exist .git file (not a directory)

if there is such file it contains path to supermodule git directory
delete this file
do git init
do git add remote path the one used for submodule
follow instructions below

If there was .git file, there surly was .git directory which tracks local tree. You still need to a branch (you can create one) or switch to master (which sometimes does not work). Best to do is - git fetch - git pull. Do not omit fetch.

Now your commits and pulls will be synchronized with your origin/master

check / uncheck checkbox using jquery?

For jQuery 1.6+ :

.attr() is deprecated for properties; use the new .prop() function instead as:

$('#myCheckbox').prop('checked', true); // Checks it
$('#myCheckbox').prop('checked', false); // Unchecks it

For jQuery < 1.6:

To check/uncheck a checkbox, use the attribute checked and alter that. With jQuery you can do:

$('#myCheckbox').attr('checked', true); // Checks it
$('#myCheckbox').attr('checked', false); // Unchecks it

Cause you know, in HTML, it would look something like:

<input type="checkbox" id="myCheckbox" checked="checked" /> <!-- Checked -->
<input type="checkbox" id="myCheckbox" /> <!-- Unchecked -->

However, you cannot trust the .attr() method to get the value of the checkbox (if you need to). You will have to rely in the .prop() method.

What does "The following object is masked from 'package:xxx'" mean?

The message means that both the packages have functions with the same names. In this particular case, the testthat and assertive packages contain five functions with the same name.

When two functions have the same name, which one gets called?

R will look through the search path to find functions, and will use the first one that it finds.

search()
 ##  [1] ".GlobalEnv"        "package:assertive" "package:testthat" 
 ##  [4] "tools:rstudio"     "package:stats"     "package:graphics" 
 ##  [7] "package:grDevices" "package:utils"     "package:datasets" 
 ## [10] "package:methods"   "Autoloads"         "package:base"

In this case, since assertive was loaded after testthat, it appears earlier in the search path, so the functions in that package will be used.

is_true
## function (x, .xname = get_name_in_parent(x)) 
## {
##     x <- coerce_to(x, "logical", .xname)
##     call_and_name(function(x) {
##         ok <- x & !is.na(x)
##         set_cause(ok, ifelse(is.na(x), "missing", "false"))
##     }, x)
## }
<bytecode: 0x0000000004fc9f10>
<environment: namespace:assertive.base>

The functions in testthat are not accessible in the usual way; that is, they have been masked.

What if I want to use one of the masked functions?

You can explicitly provide a package name when you call a function, using the double colon operator, ::. For example:

testthat::is_true
## function () 
## {
##     function(x) expect_true(x)
## }
## <environment: namespace:testthat>

How do I suppress the message?

If you know about the function name clash, and don't want to see it again, you can suppress the message by passing warn.conflicts = FALSE to library.

library(testthat)
library(assertive, warn.conflicts = FALSE)
# No output this time

Alternatively, suppress the message with suppressPackageStartupMessages:

library(testthat)
suppressPackageStartupMessages(library(assertive))
# Also no output

Impact of R's Startup Procedures on Function Masking

If you have altered some of R's startup configuration options (see ?Startup) you may experience different function masking behavior than you might expect. The precise order that things happen as laid out in ?Startup should solve most mysteries.

For example, the documentation there says:

Note that when the site and user profile files are sourced only the base package is loaded, so objects in other packages need to be referred to by e.g. utils::dump.frames or after explicitly loading the package concerned.

Which implies that when 3rd party packages are loaded via files like .Rprofile you may see functions from those packages masked by those in default packages like stats, rather than the reverse, if you loaded the 3rd party package after R's startup procedure is complete.

How do I list all the masked functions?

First, get a character vector of all the environments on the search path. For convenience, we'll name each element of this vector with its own value.

library(dplyr)
envs <- search() %>% setNames(., .)

For each environment, get the exported functions (and other variables).

fns <- lapply(envs, ls)

Turn this into a data frame, for easy use with dplyr.

fns_by_env <- data_frame(
  env = rep.int(names(fns), lengths(fns)),
  fn  = unlist(fns)
)

Find cases where the object appears more than once.

fns_by_env %>% 
  group_by(fn) %>% 
  tally() %>% 
  filter(n > 1) %>% 
  inner_join(fns_by_env)

To test this, try loading some packages with known conflicts (e.g., Hmisc, AnnotationDbi).

How do I prevent name conflict bugs?

The conflicted package throws an error with a helpful error message, whenever you try to use a variable with an ambiguous name.

library(conflicted)
library(Hmisc)
units
## Error: units found in 2 packages. You must indicate which one you want with ::
##  * Hmisc::units
##  * base::units

Disable Transaction Log

There is a third recovery mode not mentioned above. The recovery mode ultimately determines how large the LDF files become and how ofter they are written to. In cases where you are going to be doing any type of bulk inserts, you should set the DB to be in "BULK/LOGGED". This makes bulk inserts move speedily along and can be changed on the fly.

To do so,

USE master ;
ALTER DATABASE model SET RECOVERY BULK_LOGGED ;

To change it back:

USE master ;
ALTER DATABASE model SET RECOVERY FULL ;

In the spirit of adding to the conversation about why someone would not want an LDF, I add this: We do multi-dimensional modelling. Essentially we use the DB as a large store of variables that are processed in bulk using external programs. We do not EVER require rollbacks. If we could get a performance boost by turning of ALL logging, we'd take it in a heart beat.

Choose File Dialog

Was looking for a file/folder browser myself recently and decided to make a new explorer activity (Android library): https://github.com/vaal12/AndroidFileBrowser

Matching Test application https://github.com/vaal12/FileBrowserTestApplication- is a sample how to use.

Allows picking directories and files from phone file structure.

Determine if a String is an Integer in Java

You can use Integer.parseInt() or Integer.valueOf() to get the integer from the string, and catch the exception if it is not a parsable int. You want to be sure to catch the NumberFormatException it can throw.

It may be helpful to note that valueOf() will return an Integer object, not the primitive int.

How can I pass POST parameters in a URL?

You could use a form styled as a link. No JavaScript is required:

<form action="/do/stuff.php" method="post">
    <input type="hidden" name="user_id" value="123" />
    <button>Go to user 123</button>
</form>

CSS:

button {
    border: 0;
    padding: 0;
    display: inline;
    background: none;
    text-decoration: underline;
    color: blue;
}
button:hover {
    cursor: pointer;
}

See: http://jsfiddle.net/SkQRN/

what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

In my case this was caused by an integer overflow. I had a UInt16, and was doubling the value to put into an Int. The faulty code was

let result = Int(myUInt16 * 2)

However, this multiplies as a UInt16, then converts to Int. So if myUInt16 contains a value over 32767 then an overflow occurs.

All was well once I corrected the code to

let result = Int(myUint16) * 2

Hibernate Group by Criteria Object

If you have to do group by using hibernate criteria use projections.groupPropery like the following,

@Autowired
private SessionFactory sessionFactory;
Criteria crit = sessionFactory.getCurrentSession().createCriteria(studentModel.class);
crit.setProjection(Projections.projectionList()
            .add(Projections.groupProperty("studentName").as("name"))
List result = crit.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP).list(); 
return result;

Disabling SSL Certificate Validation in Spring RestTemplate

Java code example for HttpClient > 4.3

package com.example.teocodownloader;

import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

public class Example {
    public static void main(String[] args) {
        CloseableHttpClient httpClient
                = HttpClients.custom()
                .setSSLHostnameVerifier(new NoopHostnameVerifier())
                .build();
        HttpComponentsClientHttpRequestFactory requestFactory
                = new HttpComponentsClientHttpRequestFactory();
        requestFactory.setHttpClient(httpClient);
        RestTemplate restTemplate = new RestTemplate(requestFactory);
    }
}

By the way, don't forget to add the following dependencies to the pom file:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>

You could find Java code example for HttpClient < 4.3 as well.

Defining arrays in Google Scripts

This may be of help to a few who are struggling like I was:

var data = myform.getRange("A:AA").getValues().pop();
var myvariable1 = data[4];
var myvariable2 = data[7];

Edit line thickness of CSS 'underline' attribute

My Solution : https://codepen.io/SOLESHOE/pen/QqJXYj

{
    display: inline-block;
    border-bottom: 1px solid;
    padding-bottom: 0;
    line-height: 70%;
}

You can adjust underline position with line-height value, underline thickness and style with border-bottom.

Beware to disable default underline behavior if you want to underline an href.

Use of "instanceof" in Java

Basically, you check if an object is an instance of a specific class. You normally use it, when you have a reference or parameter to an object that is of a super class or interface type and need to know whether the actual object has some other type (normally more concrete).

Example:

public void doSomething(Number param) {
  if( param instanceof Double) {
    System.out.println("param is a Double");
  }
  else if( param instanceof Integer) {
    System.out.println("param is an Integer");
  }

  if( param instanceof Comparable) {
    //subclasses of Number like Double etc. implement Comparable
    //other subclasses might not -> you could pass Number instances that don't implement that interface
    System.out.println("param is comparable"); 
  }
}

Note that if you have to use that operator very often it is generally a hint that your design has some flaws. So in a well designed application you should have to use that operator as little as possible (of course there are exceptions to that general rule).

How do you push a Git tag to a branch using a refspec?

For pushing a single tag: git push <reponame> <tagname>

For instance, git push production 1.0.0. Tags are not bound to branches, they are bound to commits.

When you want to have the tag's content in the master branch, do that locally on your machine. I would assume that you continued developing in your local master branch. Then just a git push origin master should suffice.

java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

I was facing the same issue. In my case, I had a dependency of httpclient with an older version while sendgrid required a newer version of httpclient. Just make sure that the version of httpclient is correct in your dependencies and it would work fine.

How to remove leading whitespace from each line in a file

You can use AWK:

$ awk '{$1=$1}1' file
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)

sed

$ sed 's|^[[:blank:]]*||g' file
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)
for (i = 0; i < 100; i++)

The shell's `while`/`read` loop

while read -r line
do
    echo $line
done <"file"

Twitter Bootstrap add active class to li

Here is complete Twitter bootstrap example and applied active class based on query string.

Few steps to follow to achieve correct solution:

1) Include latest jquery.js and bootstrap.js javascript file.

2) Include latest bootstrap.css file

3) Include querystring-0.9.0.js for getting query string variable value in js.

4) HTML:

<div class="navbar">
  <div class="navbar-inner">
    <div class="container">
      <ul class="nav">
        <li class="active">
          <a href="#?page=0">
            Home
          </a>
        </li>
        <li>
          <a href="#?page=1">
            Forums
          </a>
        </li>
        <li>
          <a href="#?page=2">
            Blog
          </a>
        </li>
        <li>
          <a href="#?page=3">
            FAQ's
          </a>
        </li>
        <li>
          <a href="#?page=4">
            Item
          </a>
        </li>
        <li>
          <a href="#?page=5">
            Create
          </a>
        </li>
      </ul>
    </div>
  </div>
</div>

JQuery in Script Tag:

$(function() {
    $(".nav li").click(function() {
        $(".nav li").removeClass('active');
        setTimeout(function() {
            var page = $.QueryString("page");
            $(".nav li:eq(" + page + ")").addClass("active");
        }, 300);

    });
});

I have done complete bin, so please click here http://codebins.com/bin/4ldqpaf

How to Join to first row

I know this question was answered a while ago, but when dealing with large data sets, nested queries can be costly. Here is a different solution where the nested query will only be ran once, instead of for each row returned.

SELECT 
  Orders.OrderNumber,
  LineItems.Quantity, 
  LineItems.Description
FROM 
  Orders
  INNER JOIN (
    SELECT
      Orders.OrderNumber,
      Max(LineItem.LineItemID) AS LineItemID
    FROM
      Orders INNER JOIN LineItems
      ON Orders.OrderNumber = LineItems.OrderNumber
    GROUP BY Orders.OrderNumber
  ) AS Items ON Orders.OrderNumber = Items.OrderNumber
  INNER JOIN LineItems 
  ON Items.LineItemID = LineItems.LineItemID

OpenCV & Python - Image too big to display

Looks like opencv lib is pretty sensitive to parameters passed to the methods. The following code worked for me using opencv 4.3.0:

win_name = "visualization"  #  1. use var to specify window name everywhere
cv2.namedWindow(win_name, cv2.WINDOW_NORMAL)  #  2. use 'normal' flag
img = cv2.imread(filename)
h,w = img.shape[:2]  #  suits for image containing any amount of channels
h = int(h / resize_factor)  #  one must compute beforehand
w = int(w / resize_factor)  #  and convert to INT
cv2.resizeWindow(win_name, w, h)  #  use variables defined/computed BEFOREHAND
cv2.imshow(win_name, img)

Copy / Put text on the clipboard with FireFox, Safari and Chrome

There is now a way to easily do this in most modern browsers using

document.execCommand('copy');

This will copy currently selected text. You can select a textArea or input field using

document.getElementById('myText').select();

To invisibly copy text you can quickly generate a textArea, modify the text in the box, select it, copy it, and then delete the textArea. In most cases this textArea wont even flash onto the screen.

For security reasons, browsers will only allow you copy if a user takes some kind of action (ie. clicking a button). One way to do this would be to add an onClick event to a html button that calls a method which copies the text.

A full example:

_x000D_

function copier(){_x000D_
  document.getElementById('myText').select();_x000D_
  document.execCommand('copy');_x000D_
}

_x000D_

<button onclick="copier()">Copy</button>_x000D_
<textarea id="myText">Copy me PLEASE!!!</textarea>

_x000D_

Convert named list to vector with values only

Use unlist with use.names = FALSE argument.

unlist(myList, use.names=FALSE)

Using sendmail from bash script for multiple recipients

Use option -t for sendmail.

in your case - echo -e $mail | /usr/sbin/sendmail -t and add yout Recepient list to message itself like To: [email protected] [email protected] right after the line From:.....

-t option means - Read message for recipients. To:, Cc:, and Bcc: lines will be scanned for recipient addresses. The Bcc: line will be deleted before transmission.

Execute stored procedure with an Output parameter?

The easy way is to right-click on the procedure in Sql Server Management Studio(SSMS),

select execute stored procedure...

and add values for the input parameters as prompted.

SSMS will then generate the code to run the proc in a new query window, and execute it for you. You can study the generated code to see how it is done.

When is the init() function run?

Here is another example - https://play.golang.org/p/9P-LmSkUMKY

package main

import (
    "fmt"
)

func callOut() int {
    fmt.Println("Outside is beinge executed")
    return 1
}

var test = callOut()

func init() {
    fmt.Println("Init3 is being executed")
}

func init() {
    fmt.Println("Init is being executed")
}

func init() {
    fmt.Println("Init2 is being executed")
}

func main() {
    fmt.Println("Do your thing !")
}

Output of the above program

$ go run init/init.go
Outside is being executed
Init3 is being executed
Init is being executed
Init2 is being executed
Do your thing !

How to set delay in android?

If you use delay frequently in your app, use this utility class

import android.os.Handler;


public class Utils {

    // Delay mechanism

    public interface DelayCallback{
        void afterDelay();
    }

    public static void delay(int secs, final DelayCallback delayCallback){
        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                delayCallback.afterDelay();
            }
        }, secs * 1000); // afterDelay will be executed after (secs*1000) milliseconds.
    }
}

Usage:

// Call this method directly from java file

int secs = 2; // Delay in seconds

Utils.delay(secs, new Utils.DelayCallback() {
    @Override
    public void afterDelay() {
        // Do something after delay

    }
});

Missing artifact com.sun:tools:jar

Check the JDK version on your machine and in pom.xml both should be same

<dependency>
    <groupId>sun.jdk</groupId>
    <artifactId>tools</artifactId>
    <version>1.8</version>
    <scope>system</scope>
    <systemPath>C:\Program Files\Java\jdk1.8.0_192\lib\tools.jar</systemPath>
</dependency>

What are the "spec.ts" files generated by Angular CLI for?

if you generate new angular project using "ng new", you may skip a generating of spec.ts files. For this you should apply --skip-tests option.

ng new ng-app-name --skip-tests

How to change symbol for decimal point in double.ToString()?

If you have an Asp.Net web application, you can also set it in the web.config so that it is the same throughout the whole web application

<system.web>
    ...
    <globalization 
        requestEncoding="utf-8" 
        responseEncoding="utf-8" 
        culture="en-GB" 
        uiCulture="en-GB" 
        enableClientBasedCulture="false"/>
    ...
</system.web>

How to connect Robomongo to MongoDB

I exported the following connection from Studio 3T:

mongodb://youn-nosql-grej-test:[email protected]:10255/admin?3t.uriVersion=2&3t.certificatePreference=RootCACert:accept_any&3t.databases=admin&3t.connectionMode=direct&3t.useClientCertPassword=false&3t.connection.name=Grej-Test&readPreference=primary&ssl=true

And I filled it in in the following screens:

Sorting a Dictionary in place with respect to keys

Try using SortedDictionary

Java AES encryption and decryption

You state that you want to encrypt/decrypt a password. I'm not sure exactly of what your specific use case is but, generally, passwords are not stored in a form where they can be decrypted. General practice is to salt the password and use suitably powerful one-way hash (such as PBKDF2).

Take a look at the following link for more information.

http://crackstation.net/hashing-security.htm

How to get height of Keyboard?

I uses below code,

override func viewDidLoad() {
    super.viewDidLoad()
    self.registerObservers()
}

func registerObservers(){

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillAppear(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}

@objc func keyboardWillAppear(notification: Notification){
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
        self.view.transform = CGAffineTransform(translationX: 0, y: -keyboardHeight)
    }
}

@objc func keyboardWillHide(notification: Notification){
        self.view.transform = .identity
}

Python Replace \\ with \

r'a\\nb'.replace('\\\\', '\\')

'a\nb'.replace('\n', '\\n')

How to add a button dynamically in Android?

Button myButton = new Button(this);
myButton.setId(123);
myButton.setText("Push Me");


LinearLayout ll = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ll.addView(myButton, lp);
 myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Toast.makeText(DynamicLayout.this,
                        "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                        .show();
            }
        });

Read Numeric Data from a Text File in C++

Repeat >> reads in loop.

#include <iostream>
#include <fstream>
int main(int argc, char * argv[])
{
    std::fstream myfile("D:\\data.txt", std::ios_base::in);

    float a;
    while (myfile >> a)
    {
        printf("%f ", a);
    }

    getchar();

    return 0;
}

Result:

45.779999 67.900002 87.000000 34.889999 346.000000 0.980000

If you know exactly, how many elements there are in a file, you can chain >> operator:

int main(int argc, char * argv[])
{
    std::fstream myfile("D:\\data.txt", std::ios_base::in);

    float a, b, c, d, e, f;

    myfile >> a >> b >> c >> d >> e >> f;

    printf("%f\t%f\t%f\t%f\t%f\t%f\n", a, b, c, d, e, f);

    getchar();

    return 0;
}

Edit: In response to your comments in main question.

You have two options.

You can run previous code in a loop (or two loops) and throw away a defined number of values - for example, if you need the value at point (97, 60), you have to skip 5996 (= 60 * 100 + 96) values and use the last one. This will work if you're interested only in specified value.
You can load the data into an array - as Jerry Coffin sugested. He already gave you quite nice class, which will solve the problem. Alternatively, you can use simple array to store the data.

Edit: How to skip values in file

To choose the 1234th value, use the following code:

int skipped = 1233;
for (int i = 0; i < skipped; i++)
{
    float tmp;
    myfile >> tmp;
}
myfile >> value;

How to export settings?

You can now sync all your settings across devices with VSCode's built-in Settings Sync. It's found under Code > Preferences > Turn on Settings Sync...

Read more about it in the official docs here

How do I set the path to a DLL file in Visual Studio?

I know this question had been answered years ago, but for those like me who needed to change where the debugger starts the application, change the command property under Project Properties -> Debugging.

Warning: Cannot modify header information - headers already sent by ERROR

There is likely whitespace outside of your php tags.

VBA test if cell is in a range

I don't work with contiguous ranges all the time. My solution for non-contiguous ranges is as follows (includes some code from other answers here):

Sub test_inters()
    Dim rng1 As Range
    Dim rng2 As Range
    Dim inters As Range

    Set rng2 = Worksheets("Gen2").Range("K7")
    Set rng1 = ExcludeCell(Worksheets("Gen2").Range("K6:K8"), rng2)

    If (rng2.Parent.name = rng1.Parent.name) Then
        Dim ints As Range
        MsgBox rng1.Address & vbCrLf _
        & rng2.Address & vbCrLf _

        For Each cell In rng1
            MsgBox cell.Address
            Set ints = Application.Intersect(cell, rng2)
            If (Not (ints Is Nothing)) Then
                MsgBox "Yes intersection"
            Else
                MsgBox "No intersection"
            End If
        Next cell
    End If
End Sub

What does -z mean in Bash?

-z

string is null, that is, has zero length

String=''   # Zero-length ("null") string variable.

if [ -z "$String" ]
then
  echo "\$String is null."
else
  echo "\$String is NOT null."
fi     # $String is null.

MVC 4 @Scripts "does not exist"

I upgraded from Beta to RC and faced 'Scripts' does not exist issue. Surfed all over the web and the final solution is what N40JPJ said plus another workaroudn:

Copy the following in View\Web.config :

  <namespaces>
    <add namespace="System.Web.Mvc" />
    <add namespace="System.Web.Mvc.Ajax" />
    <add namespace="System.Web.Mvc.Html" />
    <add namespace="System.Web.Routing" />
    <add namespace="System.Web.Optimization"/>
    <add namespace="System.Web.Helpers"/>
  </namespaces>

and the following inside View\Shared_Layout.cshtml

@if (IsSectionDefined("scripts")) 
{
       @RenderSection("scripts", required: false)
}

Hope it helps.

How do I deal with special characters like \^$.?*|+()[{ in my regex?

I think the easiest way to match the characters like

\^$.?*|+()[

are using character classes from within R. Consider the following to clean column headers from a data file, which could contain spaces, and punctuation characters:

> library(stringr)
> colnames(order_table) <- str_replace_all(colnames(order_table),"[:punct:]|[:space:]","")

This approach allows us to string character classes to match punctation characters, in addition to whitespace characters, something you would normally have to escape with \\ to detect. You can learn more about the character classes at this cheatsheet below, and you can also type in ?regexp to see more info about this.

https://www.rstudio.com/wp-content/uploads/2016/09/RegExCheatsheet.pdf

Select all occurrences of selected word in VSCode

Ctrl + F2 works for me in Windows 10.

Ctrl + Shift + L starts performance logging

String concatenation in Jinja

If stuffs is a list of strings, just this would work:

{{ stuffs|join(", ") }}

Link to join filter documentation, link to filters in general documentation.

p.s.

More reader friendly way {{ my ~ ', ' ~ string }}

How to secure MongoDB with username and password

after you create new user, please don't forget to grant read/write/root permission to the user. you can try the

cmd: db.grantRolesToUser('yourNewUsername',[{ role: "root", db: "admin" }])

Are 'Arrow Functions' and 'Functions' equivalent / interchangeable?

To use arrow functions with function.prototype.call, I made a helper function on the object prototype:

  // Using
  // @func = function() {use this here} or This => {use This here}
  using(func) {
    return func.call(this, this);
  }

usage

  var obj = {f:3, a:2}
  .using(This => This.f + This.a) // 5

Edit

You don't NEED a helper. You could do:

var obj = {f:3, a:2}
(This => This.f + This.a).call(undefined, obj); // 5

How does String.Index work in Swift

Create a UITextView inside of a tableViewController. I used function: textViewDidChange and then checked for return-key-input. then if it detected return-key-input, delete the input of return key and dismiss keyboard.

func textViewDidChange(_ textView: UITextView) {
    tableView.beginUpdates()
    if textView.text.contains("\n"){
        textView.text.remove(at: textView.text.index(before: textView.text.endIndex))
        textView.resignFirstResponder()
    }
    tableView.endUpdates()
}

What is the ellipsis (...) for in this method signature?

The three dot (...) notation is actually borrowed from mathematics, and it means "...and so on".

As for its use in Java, it stands for varargs, meaning that any number of arguments can be added to the method call. The only limitations are that the varargs must be at the end of the method signature and there can only be one per method.

fatal error LNK1104: cannot open file 'libboost_system-vc110-mt-gd-1_51.lib'

I had same issue reported here. I solved the issue moving the mainTest.cpp from a subfolder src/mainTest/ to the main folder src/ I guess this was your problem too.

How can I check if a directory exists in a Bash shell script?

Using the -e check will check for files and this includes directories.

if [ -e ${FILE_PATH_AND_NAME} ]
then
    echo "The file or directory exists."
fi

How to insert a row between two rows in an existing excel with HSSF (Apache POI)

Referencing Qwerty's answer, if the destRow isnot null, sheet.shiftRows() will change the destRow's reference to the next row; so we should always create a new row:

if (destRow != null) {
  sheet.shiftRows(destination, sheet.getLastRowNum(), 1);
}
destRow = sheet.createRow(destination);

Running multiple commands with xargs

I prefer style which allows dry run mode (without | sh) :

cat a.txt | xargs -I % echo "command1; command2; ... " | sh

Works with pipes too:

cat a.txt | xargs -I % echo "echo % | cat " | sh

How to run an application as "run as administrator" from the command prompt?

Try this:

runas.exe /savecred /user:administrator "%sysdrive%\testScripts\testscript1.ps1"

It saves the password the first time and never asks again. Maybe when you change the administrator password you will be prompted again.

Integer.valueOf() vs. Integer.parseInt()

parseInt() parses String to int while valueOf() additionally wraps this int into Integer. That's the only difference.

If you want to have full control over parsing integers, check out NumberFormat with various locales.

How do I alter the position of a column in a PostgreSQL database table?

Open the table in PGAdmin and in the SQL pane at the bottom copy the SQL Create Table statement. Then open the Query Tool and paste. If the table has data, change the table name to 'new_name', if not, delete the comment "--" in the Drop Table line. Edit the column sequence as required. Mind the missing/superfluous comma in the last column in case you have moved it. Execute the new SQL Create Table command. Refresh and ... voilà.

For empty tables in the design stage this method is quite practical.

In case the table has data, we need to rearrange the column sequence of the data as well. This is easy: use INSERT to import the old table into its new version with:

INSERT INTO new ( c2, c3, c1 ) SELECT * from old;

... where c2, c3, c1 are the columns c1, c2, c3 of the old table in their new positions. Please note that in this case you must use a 'new' name for the edited 'old' table, or you will lose your data. In case the column names are many, long and/or complex use the same method as above to copy the new table structure into a text editor, and create the new column list there before copying it into the INSERT statement.

After checking that all is well, DROP the old table and change the the 'new' name to 'old' using ALTER TABLE new RENAME TO old; and you are done.

Float a div in top right corner without overlapping sibling header

If you can change the order of the elements, floating will work.

_x000D_

section {_x000D_
  position: relative;_x000D_
  width: 50%;_x000D_
  border: 1px solid;_x000D_
}_x000D_
h1 {_x000D_
  display: inline;_x000D_
}_x000D_
div {_x000D_
  float: right;_x000D_
}

_x000D_

<section>_x000D_
  <div>_x000D_
    <button>button</button>_x000D_
  </div>_x000D_
_x000D_
  <h1>some long long long long header, a whole line, 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6</h1>_x000D_
</section>

_x000D_

?By placing the div before the h1 and floating it to the right, you get the desired effect.

How to write "Html.BeginForm" in Razor

The following code works fine:

@using (Html.BeginForm("Upload", "Upload", FormMethod.Post, 
                                      new { enctype = "multipart/form-data" }))
{
    @Html.ValidationSummary(true)
    <fieldset>
        Select a file <input type="file" name="file" />
        <input type="submit" value="Upload" />
    </fieldset>
}

and generates as expected:

<form action="/Upload/Upload" enctype="multipart/form-data" method="post">    
    <fieldset>
        Select a file <input type="file" name="file" />
        <input type="submit" value="Upload" />
    </fieldset>
</form>

On the other hand if you are writing this code inside the context of other server side construct such as an if or foreach you should remove the @ before the using. For example:

@if (SomeCondition)
{
    using (Html.BeginForm("Upload", "Upload", FormMethod.Post, 
                                      new { enctype = "multipart/form-data" }))
    {
        @Html.ValidationSummary(true)
        <fieldset>
            Select a file <input type="file" name="file" />
            <input type="submit" value="Upload" />
        </fieldset>
    }
}

As far as your server side code is concerned, here's how to proceed:

[HttpPost]
public ActionResult Upload(HttpPostedFileBase file) 
{
    if (file != null && file.ContentLength > 0) 
    {
        var fileName = Path.GetFileName(file.FileName);
        var path = Path.Combine(Server.MapPath("~/content/pics"), fileName);
        file.SaveAs(path);
    }
    return RedirectToAction("Upload");
}

What is the effect of extern "C" in C++?

It changes the linkage of a function in such a way that the function is callable from C. In practice that means that the function name is not mangled.

ArrayList vs List<> in C#

I think, the differences between ArrayList and List<T> are:

List<T>, where T is value-type is faster than ArrayList. This is because List<T> avoids boxing/unboxing (where T is value-type).
Many sources say - usually ArrayList used just for backward compatibility. (is not a real difference, but i think it is important note).
Reflection is easier with nongeneric ArrayList then List<T>

ArrayList has IsSynchronized property. So, It is easy to create and use syncronised ArrayList. I didin't found IsSynchronized property for List<T>. Also Keep in mind this type of synchronization is relatively inefficient, msdn):

var arraylist = new ArrayList();
var arrayListSyncronized = ArrayList.Synchronized(arraylist
Console.WriteLine($"syncronized {arraylist.IsSynchronized}");
Console.WriteLine($"syncronized {arrayListSyncronized.IsSynchronized}");

var list = new List<object>();
var listSyncronized = ArrayList.Synchronized(list);
Console.WriteLine($"syncronized {list.IsSynchronized}");//error, no such prop
Console.WriteLine($"syncronized {list.IsSynchronized}");//error, no such prop

ArrayList has ArrayList.SyncRoot property which can be used for syncronisation (msdn). List<T> hasn't SyncRoot property, so in the following construction you need to use some object if you use List<T>:

ArrayList myCollection = new ArrayList();
lock(myCollection.SyncRoot) //  ofcourse you can use another object for this goal
{
    foreach (object item in myCollection)
    {
        // ...
    }
}

How can I parse a local JSON file from assets folder into a ListView?

{ // json object node
    "formules": [ // json array formules
    { // json object 
      "formule": "Linear Motion", // string
      "url": "qp1"
    }

What you are doing

  Context context = null; // context is null 
    try {
        String jsonLocation = AssetJSONFile("formules.json", context);

So change to

   try {
        String jsonLocation = AssetJSONFile("formules.json", CatList.this);

To parse

I believe you get the string from the assests folder.

try
{
String jsonLocation = AssetJSONFile("formules.json", context);
JSONObject jsonobject = new JSONObject(jsonLocation);
JSONArray jarray = (JSONArray) jsonobject.getJSONArray("formules");
for(int i=0;i<jarray.length();i++)
{
JSONObject jb =(JSONObject) jarray.get(i);
String formula = jb.getString("formule");
String url = jb.getString("url");
}
} catch (IOException e) {
        e.printStackTrace();
} catch (JSONException e) {
        e.printStackTrace();
}

percentage of two int?

One of them has to be a float going in. One possible way of ensuring that is:

float percent = (float) n/v * 100;

Otherwise, you're doing integer division, which truncates the numbers. Also, you should be using double unless there's a good reason for the float.

The next issue you'll run into is that some of your percentages might look like 24.9999999999999% instead of 25%. This is due to precision loss in floating point representation. You'll have to decide how to deal with that, too. Options include a DecimalFormat to "fix" the formatting or BigDecimal to represent exact values.

json_encode() escaping forward slashes

On the flip side, I was having an issue with PHPUNIT asserting urls was contained in or equal to a url that was json_encoded -

my expected:

http://localhost/api/v1/admin/logs/testLog.log

would be encoded to:

http:\/\/localhost\/api\/v1\/admin\/logs\/testLog.log

If you need to do a comparison, transforming the url using:

addcslashes($url, '/')

allowed for the proper output during my comparisons.

Using SQL LIKE and IN together

You can use a sub-query with wildcards:

 SELECT 'Valid Expression'
 WHERE 'Source Column' LIKE (SELECT '%Column' --FROM TABLE)

Or you can use a single string:

 SELECT 'Valid Expression'
 WHERE 'Source Column' LIKE ('%Source%' + '%Column%')

How to quickly and conveniently disable all console.log statements in my code?

My comprehensive solution to disable/override all console.* functions is here.

Of course, please make sure you are including it after checking necessary context. For example, only including in production release, it's not bombing any other crucial components etc.

Quoting it here:

_x000D_

"use strict";_x000D_
(() => {_x000D_
  var console = (window.console = window.console || {});_x000D_
  [_x000D_
    "assert", "clear", "count", "debug", "dir", "dirxml",_x000D_
    "error", "exception", "group", "groupCollapsed", "groupEnd",_x000D_
    "info", "log", "markTimeline", "profile", "profileEnd", "table",_x000D_
    "time", "timeEnd", "timeStamp", "trace", "warn"_x000D_
  ].forEach(method => {_x000D_
    console[method] = () => {};_x000D_
  });_x000D_
  console.log("This message shouldn't be visible in console log");_x000D_
})();

_x000D_

Uncaught TypeError: $(...).datepicker is not a function(anonymous function)

Including more than one reference to Jquery library is the reason for the error Only Include one reference to the Jquery library and that will resolve the issue

Validating file types by regular expression

You can embed case insensitity into the regular expression like so:

\.(?i:)(?:jpg|gif|doc|pdf)$

How do I loop over a hash of hashes?

How to remove css property in jQuery

How do you add UI inside cells in a google spreadsheet using app script?

Status 2018:

There seems to be no way to place buttons (drawings, images) within cells in a way that would allow them to be linked to Apps Script functions.

This being said, there are some things that you can indeed do:

You can...

You can place images within cells using IMAGE(URL), but they cannot be linked to Apps Script functions.

You can place images within cells and link them to URLs using:
=HYPERLINK("http://example.com"; IMAGE("http://example.com/myimage.png"; 1))

You can create drawings as described in the answer of @Eduardo and they can be linked to Apps Script functions, but they will be stand-alone items that float freely "above" the spreadsheet and cannot be positioned in cells. They cannot be copied from cell to cell and they do not have a row or col position that the script function could read.

Android Emulator sdcard push error: Read-only file system

Alternate way: Dismount the drive (from settings/storage) and re-mount the sdcard also fixes the problem. (verify by moving a file from internal storage to sdcard) In any case, this simple method saved my butt this time :)

numpy division with RuntimeWarning: invalid value encountered in double_scalars

You can't solve it. Simply answer1.sum()==0, and you can't perform a division by zero.

This happens because answer1 is the exponential of 2 very large, negative numbers, so that the result is rounded to zero.

nan is returned in this case because of the division by zero.

Now to solve your problem you could:

go for a library for high-precision mathematics, like mpmath. But that's less fun.
as an alternative to a bigger weapon, do some math manipulation, as detailed below.
go for a tailored scipy/numpy function that does exactly what you want! Check out @Warren Weckesser answer.

Here I explain how to do some math manipulation that helps on this problem. We have that for the numerator:

exp(-x)+exp(-y) = exp(log(exp(-x)+exp(-y)))
                = exp(log(exp(-x)*[1+exp(-y+x)]))
                = exp(log(exp(-x) + log(1+exp(-y+x)))
                = exp(-x + log(1+exp(-y+x)))

where above x=3* 1089 and y=3* 1093. Now, the argument of this exponential is

-x + log(1+exp(-y+x)) = -x + 6.1441934777474324e-06

For the denominator you could proceed similarly but obtain that log(1+exp(-z+k)) is already rounded to 0, so that the argument of the exponential function at the denominator is simply rounded to -z=-3000. You then have that your result is

exp(-x + log(1+exp(-y+x)))/exp(-z) = exp(-x+z+log(1+exp(-y+x)) 
                                   = exp(-266.99999385580668)

which is already extremely close to the result that you would get if you were to keep only the 2 leading terms (i.e. the first number 1089 in the numerator and the first number 1000 at the denominator):

exp(3*(1089-1000))=exp(-267)

For the sake of it, let's see how close we are from the solution of Wolfram alpha (link):

Log[(exp[-3*1089]+exp[-3*1093])/([exp[-3*1000]+exp[-3*4443])] -> -266.999993855806522267194565420933791813296828742310997510523

The difference between this number and the exponent above is +1.7053025658242404e-13, so the approximation we made at the denominator was fine.

The final result is

'exp(-266.99999385580668) = 1.1050349147204485e-116

From wolfram alpha is (link)

1.105034914720621496.. × 10^-116 # Wolfram alpha.

and again, it is safe to use numpy here too.

Recommended method for escaping HTML in Java

An alternative to Apache Commons: Use Spring's HtmlUtils.htmlEscape(String input) method.

Iterate through 2 dimensional array

These functions should work.

// First, cache your array dimensions so you don't have to
//  access them during each iteration of your for loops.
int rowLength = array.length,       // array width (# of columns)
    colLength = array[0].length;    // array height (# of rows)

//     This is your function:
// Prints array elements row by row
var rowString = "";
for(int x = 0; x < rowLength; x++){     // x is the column's index
    for(int y = 0; y < colLength; y++){ // y is the row's index
        rowString += array[x][y];
    } System.out.println(rowString)
}

//      This is the one you want:
// Prints array elements column by column
var colString = "";
for(int y = 0; y < colLength; y++){      // y is the row's index
    for(int x = 0; x < rowLength; x++){  // x is the column's index
        colString += array[x][y];
    } System.out.println(colString)
}

In the first block, the inner loop iterates over each item in the row before moving to the next column.

In the second block (the one you want), the inner loop iterates over all the columns before moving to the next row.

tl;dr: Essentially, the for() loops in both functions are switched. That's it.

I hope this helps you to understand the logic behind iterating over 2-dimensional arrays.

Also, this works whether you have a string[,] or string[][]

What is declarative programming?

It depends on how you submit the answer to the text. Overall you can look at the programme at a certain view but it depends what angle you look at the problem. I will get you started with the programme: Dim Bus, Car, Time, Height As Integr

Again it depends on what the problem is an overall. You might have to shorten it due to the programme. Hope this helps and need the feedback if it does not. Thank You.

How to set width of a div in percent in JavaScript?

document.getElementById('header').style.width = '50%';

If you are using Firebug or the Chrome/Safari Developer tools, execute the above in the console, and you'll see the Stack Overflow header shrink by 50%.

Initialize/reset struct to zero/null

 struct x myX;
 ...
 memset(&x, 0, sizeof(myX));

Can't update: no tracked branch

Create a new folder and run git init in it.

Then try git remote add origin <your-repository-url>.

Copy all the files in your project folder to the new folder, except the .git folder (it may be invisible).

Then you can push your code by doing:
git add --all; or git add -A;
git commit -m "YOUR MESSAGE";
git push -u origin master.

I think it will work!

Strip last two characters of a column in MySQL

To select all characters except the last n from a string (or put another way, remove last n characters from a string); use the SUBSTRING and CHAR_LENGTH functions together:

SELECT col
     , /* ANSI Syntax  */ SUBSTRING(col FROM 1 FOR CHAR_LENGTH(col) - 2) AS col_trimmed
     , /* MySQL Syntax */ SUBSTRING(col,     1,    CHAR_LENGTH(col) - 2) AS col_trimmed
FROM tbl

To remove a specific substring from the end of string, use the TRIM function:

SELECT col
     , TRIM(TRAILING '.php' FROM col)
-- index.php becomes index
-- index.txt remains index.txt

Add a UIView above all, even the navigation bar

You need to add a subview to the first window with the UITextEffectsWindow type. To the first, because custom keyboards add their UITextEffectsWindow, and if you add a subview to it this won't work correctly. Also, you cannot add a subview to the last window because the keyboard, for example, is also a window and you can`t present from the keyboard window. So the best solution I found is to add subview (or even push view controller) to the first window with UITextEffectsWindow type, this window covers accessory view, navbar - everything.

let myView = MyView()
myView.frame = UIScreen.main.bounds

guard let textEffectsWindow = NSClassFromString("UITextEffectsWindow") else { return }
let window = UIApplication.shared.windows.first { window in
    window.isKind(of: textEffectsWindow)
}
window?.rootViewController?.view.addSubview(myView)

Python Socket Multiple Clients

accept can continuously provide new client connections. However, note that it, and other socket calls are usually blocking. Therefore you have a few options at this point:

Open new threads to handle clients, while the main thread goes back to accepting new clients
As above but with processes, instead of threads
Use asynchronous socket frameworks like Twisted, or a plethora of others

Why is my JQuery selector returning a n.fn.init[0], and what is it?

Error is that you are using 'ID' in lower case like 'checkbox1' but when you loop json object its return in upper case. So you need to replace checkbox1 to CHECKBOX1.

In my case :-

var response = jQuery.parseJSON(response);

$.each(response, function(key, value) {
   $.each(value, function(key, value){
        $('#'+key).val(value);
   });
});

Before

  <input type="text" name="abc" id="abc" value="">

I am getting the same error but when i replace the id in html code its work fine.

After

<input type="text" name="abc" id="ABC" value="">

Getting the closest string match

A sample using C# is here.

public static void Main()
{
    Console.WriteLine("Hello World " + LevenshteinDistance("Hello","World"));
    Console.WriteLine("Choice A " + LevenshteinDistance("THE BROWN FOX JUMPED OVER THE RED COW","THE RED COW JUMPED OVER THE GREEN CHICKEN"));
    Console.WriteLine("Choice B " + LevenshteinDistance("THE BROWN FOX JUMPED OVER THE RED COW","THE RED COW JUMPED OVER THE RED COW"));
    Console.WriteLine("Choice C " + LevenshteinDistance("THE BROWN FOX JUMPED OVER THE RED COW","THE RED FOX JUMPED OVER THE BROWN COW"));
}

public static float LevenshteinDistance(string a, string b)
{
    var rowLen = a.Length;
    var colLen = b.Length;
    var maxLen = Math.Max(rowLen, colLen);

    // Step 1
    if (rowLen == 0 || colLen == 0)
    {
        return maxLen;
    }

    /// Create the two vectors
    var v0 = new int[rowLen + 1];
    var v1 = new int[rowLen + 1];

    /// Step 2
    /// Initialize the first vector
    for (var i = 1; i <= rowLen; i++)
    {
        v0[i] = i;
    }

    // Step 3
    /// For each column
    for (var j = 1; j <= colLen; j++)
    {
        /// Set the 0'th element to the column number
        v1[0] = j;

        // Step 4
        /// For each row
        for (var i = 1; i <= rowLen; i++)
        {
            // Step 5
            var cost = (a[i - 1] == b[j - 1]) ? 0 : 1;

            // Step 6
            /// Find minimum
            v1[i] = Math.Min(v0[i] + 1, Math.Min(v1[i - 1] + 1, v0[i - 1] + cost));
        }

        /// Swap the vectors
        var vTmp = v0;
        v0 = v1;
        v1 = vTmp;
    }

    // Step 7
    /// The vectors were swapped one last time at the end of the last loop,
    /// that is why the result is now in v0 rather than in v1
    return v0[rowLen];
}

The output is:

Hello World 4
Choice A 15
Choice B 6
Choice C 8

How to loop through all the files in a directory in c # .net?

You can have a look at this page showing Deep Folder Copy, it uses recursive means to iterate throught the files and has some really nice tips, like filtering techniques etc.

http://www.codeproject.com/Tips/512208/Folder-Directory-Deep-Copy-including-sub-directori

Purpose of Unions in C and C++

You can use a a union for two main reasons:

A handy way to access the same data in different ways, like in your example
A way to save space when there are different data members of which only one can ever be 'active'

1 Is really more of a C-style hack to short-cut writing code on the basis you know how the target system's memory architecture works. As already said you can normally get away with it if you don't actually target lots of different platforms. I believe some compilers might let you use packing directives also (I know they do on structs)?

A good example of 2. can be found in the VARIANT type used extensively in COM.

Spring security CORS Filter

There's 8 hours of my life I will never get back...

Make sure that you set both Exposed Headers AND Allowed Headers in your CorsConfiguration

@Bean
CorsConfigurationSource corsConfigurationSource() {
    CorsConfiguration configuration = new CorsConfiguration();
    configuration.setAllowedOrigins(Collections.singletonList("http://localhost:3000"));
    configuration.setAllowedMethods(Arrays.asList("GET","POST", "PUT", "DELETE", "PATCH", "OPTIONS"));
    configuration.setExposedHeaders(Arrays.asList("Authorization", "content-type"));
    configuration.setAllowedHeaders(Arrays.asList("Authorization", "content-type"));
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", configuration);
    return source;
}

How to select last child element in jQuery?

For 2019 ...

jQuery 3.4.0 is deprecating :first, :last, :eq, :even, :odd, :lt, :gt, and :nth. When we remove Sizzle, we’ll replace it with a small wrapper around querySelectorAll, and it would be almost impossible to reimplement these selectors without a larger selector engine.

We think this trade-off is worth it. Keep in mind we will still support the positional methods, such as .first, .last, and .eq. Anything you can do with positional selectors, you can do with positional methods instead. They perform better anyway.

https://blog.jquery.com/2019/04/10/jquery-3-4-0-released/

So you should be now be using .first(), .last() instead (or no jQuery).

Convert javascript object or array to json for ajax data

I'm not entirely sure but I think you are probably surprised at how arrays are serialized in JSON. Let's isolate the problem. Consider following code:

var display = Array();
display[0] = "none";
display[1] = "block";
display[2] = "none";

console.log( JSON.stringify(display) );

This will print:

["none","block","none"]

This is how JSON actually serializes array. However what you want to see is something like:

{"0":"none","1":"block","2":"none"}

To get this format you want to serialize object, not array. So let's rewrite above code like this:

var display2 = {};
display2["0"] = "none";
display2["1"] = "block";
display2["2"] = "none";

console.log( JSON.stringify(display2) );

This will print in the format you want.

You can play around with this here: http://jsbin.com/oDuhINAG/1/edit?js,console

When should iteritems() be used instead of items()?

The six library helps with writing code that is compatible with both python 2.5+ and python 3. It has an iteritems method that will work in both python 2 and 3. Example:

import six

d = dict( foo=1, bar=2 )

for k, v in six.iteritems(d):
    print(k, v)

How to set UICollectionViewCell Width and Height programmatically

The collection view has a layout object. In your case, it is probably a flow layout (UICollectionViewFlowLayout). Set the flow layout's itemSize property.

error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '0' doesn't match value '2' in main.obj

I had a mismatch between projects: one with multi-byte character set, the other with Unicode. Correcting these to agree on Unicode corrected the problem.

PHP Fatal Error Failed opening required File

It's not actually an Apache related question. Nor even a PHP related one. To understand this error you have to distinguish a path on the virtual server from a path in the filesystem.

require operator works with files. But a path like this

                          /common/configs/config_templates.inc.php

only exists on the virtual HTTP server, while there is no such path in the filesystem. The correct filesystem path would be

/home/viapics1/public_html/common/configs/config_templates.inc.php

where

/home/viapics1/public_html

part is called the Document root and it connects the virtual world with the real one. Luckily, web-servers usually have the document root in a configuration variable that they share with PHP. So if you change your code to something like this

require_once $_SERVER['DOCUMENT_ROOT'].'/common/configs/config_templates.inc.php';

it will work from any file placed in any directory!

Update: eventually I wrote an article that explains the difference between relative and absolute paths, in the file system and on the web server, which explains the matter in detail, and contains some practical solutions. Like, such a handy variable doesn't exist when you run your script from a command line. In this case a technique called "a single entry point" is to the rescue. You may refer to the article above for the details as well.

Get the Highlighted/Selected text

Use window.getSelection().toString().

You can read more on developer.mozilla.org

Create a Maven project in Eclipse complains "Could not resolve archetype"

This might sound silly, but make sure the "Offline" checkbox in Maven settings is unchecked. I was trying to create a project and got this error until I noticed the checkbox.

What are bitwise shift (bit-shift) operators and how do they work?

One gotcha is that the following is implementation dependent (according to the ANSI standard):

char x = -1;
x >> 1;

x can now be 127 (01111111) or still -1 (11111111).

In practice, it's usually the latter.

How to get text of an element in Selenium WebDriver, without including child element text?

You don't have to do a replace, you can get the length of the children text and subtract that from the overall length, and slice into the original text. That should be substantially faster.

How to fetch all Git branches

We can put all branch or tag names in a temporary file, then do git pull for each name/tag:

git branch -r | grep origin | grep -v HEAD| awk -F/ '{print $NF}' > /tmp/all.txt
git tag -l >> /tmp/all.txt
for tag_or_branch in `cat /tmp/all.txt`; do git checkout $tag_or_branch; git pull origin $tag_or_branch; done

Selenium Webdriver move mouse to Point

Why use java.awt.Robot when org.openqa.selenium.interactions.Actions.class would probably work fine? Just sayin.

Actions builder = new Actions(driver);

builder.keyDown(Keys.CONTROL)
   .click(someElement)
   .moveByOffset( 10, 25 );
   .click(someOtherElement)
   .keyUp(Keys.CONTROL).build().perform();

setContentView(R.layout.main); error

Simply:

Right click on your project.
Go to properties.
Select android (second option in the Left panel).
Click "add..." (in library), select your project.
Click ok.
And finally, clean your project.

If this doesn't work, make sure that "android-support-v7-appcompat" is in your Project Explorer.

If it isn't there, you can add it by importing a simple project from: C:/android-sdks\extras\android\support\v7\appcompat

How do I edit an incorrect commit message in git ( that I've pushed )?

(From http://git.or.cz/gitwiki/GitTips#head-9f87cd21bcdf081a61c29985604ff4be35a5e6c0)

How to change commits deeper in history

Since history in Git is immutable, fixing anything but the most recent commit (commit which is not branch head) requires that the history is rewritten from the changed commit and forward.

You can use StGIT for that, initialize branch if necessary, uncommitting up to the commit you want to change, pop to it if necessary, make a change then refresh patch (with -e option if you want to correct commit message), then push everything and stg commit.

Or you can use rebase to do that. Create new temporary branch, rewind it to the commit you want to change using git reset --hard, change that commit (it would be top of current head), then rebase branch on top of changed commit, using git rebase --onto .

Or you can use git rebase --interactive, which allows various modifications like patch re-ordering, collapsing, ...

I think that should answer your question. However, note that if you have pushed code to a remote repository and people have pulled from it, then this is going to mess up their code histories, as well as the work they've done. So do it carefully.

How to SELECT the last 10 rows of an SQL table which has no ID field?

you can with code select 10 row from end of table. select * from (SELECT * FROM table1 order by id desc LIMIT 10) as table2 order by id"

How to get the current time in milliseconds from C in Linux?

C11 timespec_get

It returns up to nanoseconds, rounded to the resolution of the implementation.

It is already implemented in Ubuntu 15.10. API looks the same as the POSIX clock_gettime.

#include <time.h>
struct timespec ts;
timespec_get(&ts, TIME_UTC);
struct timespec {
    time_t   tv_sec;        /* seconds */
    long     tv_nsec;       /* nanoseconds */
};

More details here: https://stackoverflow.com/a/36095407/895245

This Handler class should be static or leaks might occur: IncomingHandler

I am not sure but you can try intialising handler to null in onDestroy()

What is the best way to clone/deep copy a .NET generic Dictionary<string, T>?

(Note: although the cloning version is potentially useful, for a simple shallow copy the constructor I mention in the other post is a better option.)

How deep do you want the copy to be, and what version of .NET are you using? I suspect that a LINQ call to ToDictionary, specifying both the key and element selector, will be the easiest way to go if you're using .NET 3.5.

For instance, if you don't mind the value being a shallow clone:

var newDictionary = oldDictionary.ToDictionary(entry => entry.Key,
                                               entry => entry.Value);

If you've already constrained T to implement ICloneable:

var newDictionary = oldDictionary.ToDictionary(entry => entry.Key, 
                                               entry => (T) entry.Value.Clone());

(Those are untested, but should work.)

How to read .pem file to get private and public key

Well, my code is like yours, with little diferences...

public static X509Certificate loadPublicX509(String fileName) 
        throws GeneralSecurityException {
    InputStream is = null;
    X509Certificate crt = null;
    try {
        is = fileName.getClass().getResourceAsStream("/" + fileName);
        CertificateFactory cf = CertificateFactory.getInstance("X.509");
        crt = (X509Certificate)cf.generateCertificate(is);
    } finally {
        closeSilent(is);
    }
    return crt;
}

public static PrivateKey loadPrivateKey(String fileName) 
        throws IOException, GeneralSecurityException {
    PrivateKey key = null;
    InputStream is = null;
    try {
        is = fileName.getClass().getResourceAsStream("/" + fileName);
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        StringBuilder builder = new StringBuilder();
        boolean inKey = false;
        for (String line = br.readLine(); line != null; line = br.readLine()) {
            if (!inKey) {
                if (line.startsWith("-----BEGIN ") && 
                        line.endsWith(" PRIVATE KEY-----")) {
                    inKey = true;
                }
                continue;
            }
            else {
                if (line.startsWith("-----END ") && 
                        line.endsWith(" PRIVATE KEY-----")) {
                    inKey = false;
                    break;
                }
                builder.append(line);
            }
        }
        //
        byte[] encoded = DatatypeConverter.parseBase64Binary(builder.toString());
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        key = kf.generatePrivate(keySpec);
    } finally {
        closeSilent(is);
    }
    return key;
}

public static void closeSilent(final InputStream is) {
    if (is == null) return;
    try { is.close(); } catch (Exception ign) {}
}

foreach vs someList.ForEach(){}

Behind the scenes, the anonymous delegate gets turned into an actual method so you could have some overhead with the second choice if the compiler didn't choose to inline the function. Additionally, any local variables referenced by the body of the anonymous delegate example would change in nature because of compiler tricks to hide the fact that it gets compiled to a new method. More info here on how C# does this magic:

http://blogs.msdn.com/oldnewthing/archive/2006/08/04/688527.aspx

How to add bootstrap in angular 6 project?

For Angular Version 11+

Configuration

The styles and scripts options in your angular.json configuration now allow to reference a package directly:

before: "styles": ["../node_modules/bootstrap/dist/css/bootstrap.css"]
after: "styles": ["bootstrap/dist/css/bootstrap.css"]

          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/ng6",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.css","bootstrap/dist/css/bootstrap.min.css"

            ],
            "scripts": [
                       "jquery/dist/jquery.min.js",
                       "bootstrap/dist/js/bootstrap.min.js"
                       ]
          },

Angular Version 10 and below

You are using Angular v6 not 2

Angular v6 Onwards

CLI projects in angular 6 onwards will be using angular.json instead of .angular-cli.json for build and project configuration.

Each CLI workspace has projects, each project has targets, and each target can have configurations.Docs

. {
  "projects": {
    "my-project-name": {
      "projectType": "application",
      "architect": {
        "build": {
          "configurations": {
            "production": {},
            "demo": {},
            "staging": {},
          }
        },
        "serve": {},
        "extract-i18n": {},
        "test": {},
      }
    },
    "my-project-name-e2e": {}
  },
}

OPTION-1
execute npm install bootstrap@4 jquery --save
The JavaScript parts of Bootstrap are dependent on jQuery. So you need the jQuery JavaScript library file too.

In your angular.json add the file paths to the styles and scripts array in under build target
NOTE: Before v6 the Angular CLI project configuration was stored in <PATH_TO_PROJECT>/.angular-cli.json. As of v6 the location of the file changed to angular.json. Since there is no longer a leading dot, the file is no longer hidden by default and is on the same level.
which also means that file paths in angular.json should not contain leading dots and slash

i.e you can provide an absolute path instead of a relative path

In .angular-cli.json file Path was "../node_modules/"
In angular.json it is "node_modules/"

 "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/ng6",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.css","node_modules/bootstrap/dist/css/bootstrap.min.css"
               
            ],
            "scripts": ["node_modules/jquery/dist/jquery.min.js",
                       "node_modules/bootstrap/dist/js/bootstrap.min.js"]
          },

OPTION 2
Add files from CDN (Content Delivery Network) to your project CDN LINK

Open file src/index.html and insert

the <link> element at the end of the head section to include the Bootstrap CSS file
a <script> element to include jQuery at the bottom of the body section
a <script> element to include Popper.js at the bottom of the body section
a <script> element to include the Bootstrap JavaScript file at the bottom of the body section

  <!doctype html>
    <html>
    <head>
      <meta charset="utf-8">
      <title>Angular</title>
      <base href="/">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link rel="icon" type="image/x-icon" href="favicon.ico">
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    </head>
    <body>
      <app-root>Loading...</app-root>
      <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
    </body>
    </html>

OPTION 3
Execute npm install bootstrap
In src/styles.css add the following line:

@import "~bootstrap/dist/css/bootstrap.css";

OPTION-4
ng-bootstrap It contains a set of native Angular directives based on Bootstrap’s markup and CSS. As a result, it's not dependent on jQuery or Bootstrap’s JavaScript

npm install --save @ng-bootstrap/ng-bootstrap

After Installation import it in your root module and register it in @NgModule imports` array

import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
@NgModule({
  declarations: [AppComponent, ...],
  imports: [NgbModule.forRoot(), ...],
  bootstrap: [AppComponent]
})

NOTE
ng-bootstrap requires Bootstrap's 4 css to be added in your project. you need to Install it explicitly via:
npm install bootstrap@4 --save In your angular.json add the file paths to the styles array in under build target

   "styles": [
      "src/styles.css",
      "node_modules/bootstrap/dist/css/bootstrap.min.css"
   ],

P.S Do Restart Your server

`ng serve || npm start`

Inserting into Oracle and retrieving the generated sequence ID

Doing it as a stored procedure does have lot of advantages. You can get the sequence that is inserted into the table using syntax insert into table_name values returning.

Like:

declare
some_seq_val  number;
lv_seq        number;
begin
some_seq_val := your_seq.nextval;
insert into your_tab (col1, col2, col3) 
values (some_seq_val, val2, val3) returning some_seq_val into lv_seq;

dbms_output.put_line('The inserted sequence is: '||to_char(lv_seq));
end;
/

Or just return some_seq_val. In case you are not making use of SEQUENCE, and arriving the sequence on some calculation, you can make use of returning into effectively.

ssh server connect to host xxx port 22: Connection timed out on linux-ubuntu

I got this error and found that I don't have my SSH port (non standard number) whitelisted in config server firewall.

postgres default timezone

To acomplish the timezone change in Postgres 9.1 you must:

1.- Search in your "timezones" folder in /usr/share/postgresql/9.1/ for the appropiate file, in my case would be "America.txt", in it, search for the closest location to your zone and copy the first letters in the left column.

For example: if you are in "New York" or "Panama" it would be "EST":

#  - EST: Eastern Standard Time (Australia)
EST    -18000    # Eastern Standard Time (America)
                 #     (America/New_York)
                 #     (America/Panama)

2.- Uncomment the "timezone" line in your postgresql.conf file and put your timezone as shown:

#intervalstyle = 'postgres'
#timezone = '(defaults to server environment setting)'
timezone = 'EST'
#timezone_abbreviations = 'EST'     # Select the set of available time zone
                                        # abbreviations.  Currently, there are
                                        #   Default
                                        #   Australia

3.- Restart Postgres

How to check if a variable is equal to one string or another string?

for a in soup("p",{'id':'pagination'})[0]("a",{'href': True}):
        if createunicode(a.text) in ['<','<']:
            links.append(a.attrMap['href'])
        else:
            continue

It works for me.

Detect end of ScrollView

We should always add scrollView.getPaddingBottom() to match full scrollview height because some time scroll view has padding in xml file so that case its not going to work.

scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
        @Override
        public void onScrollChanged() {
            if (scrollView != null) {
               View view = scrollView.getChildAt(scrollView.getChildCount()-1);
               int diff = (view.getBottom()+scrollView.getPaddingBottom()-(scrollView.getHeight()+scrollView.getScrollY()));

          // if diff is zero, then the bottom has been reached
               if (diff == 0) {
               // do stuff
                }
            }
        }
    });

java.text.ParseException: Unparseable date

Your pattern does not correspond to the input string at all... It is not surprising that it does not work. This would probably work better:

SimpleDateFormat sdf = new SimpleDateFormat("EE MMM dd HH:mm:ss z yyyy",
                                            Locale.ENGLISH);

Then to print with your required format you need a second SimpleDateFormat:

Date parsedDate = sdf.parse(date);
SimpleDateFormat print = new SimpleDateFormat("MMM d, yyyy HH:mm:ss");
System.out.println(print.format(parsedDate));

Notes:

you should include the locale as if your locale is not English, the day name might not be recognised
IST is ambiguous and can lead to problems so you should use the proper time zone name if possible in your input.

HTML tag inside JavaScript

<div id="demo"></div>

<script type="text/javascript">
    if(document.getElementById('number1').checked) {
        var demo = document.getElementById("demo");    
        demo.innerHtml='<h1>Hello member</h1>';
    } else {
        demo.innerHtml='';
    }
</script>

Change tab bar item selected color in a storyboard

You can change colors UITabBarItem by storyboard but if you want to change colors by code it's very easy:

// Use this for change color of selected bar

   [[UITabBar appearance] setTintColor:[UIColor blueColor]];

// This for change unselected bar (iOS 10)

   [[UITabBar appearance] setUnselectedItemTintColor:[UIColor yellowColor]];

// And this line for change color of all tabbar

   [[UITabBar appearance] setBarTintColor:[UIColor whiteColor]];

How to set Status Bar Style in Swift 3

There seems to be a small issue about the status bar text colour when dealing with navigation bars.

If you want the .plist entry View controller-based status bar appearance set to YES, it sometimes won't work when you have a coloured nav bar.

For example:

override func viewWillAppear(_ animated: Bool) {
    let nav = self.navigationController?.navigationBar
    nav?.barTintColor = .red
    nav?.tintColor = .white
    nav?.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
    setNeedsStatusBarAppearanceUpdate()
}

and

override var preferredStatusBarStyle: UIStatusBarStyle {return .lightContent}

The code above won't work even if you have set the following in the AppDelegate:

UIApplication.shared.statusBarStyle = .lightContent

For those still struggling, apparently it somehow judges if the status bar needs to be light or dark by the styles in the nav bar. So, I managed to fix this by adding the following line in viewWillAppear:

nav?.barStyle = UIBarStyle.black

When the bar style is black, then it listens to your overridden variable. Hope this helps someone :)

How to add images to README.md on GitHub?

I am just extending or adding an example to the already accepted answer.

Once you have put the image on your Github repo.

Then:

Open the corresponding Github repo on your browser.
Navigate to the target image file Then just open the image in a new tab.
Copy the url
And finally insert the url to the following pattern ![alt text](https://raw.githubusercontent.com/username/projectname/branch/path/to/img.png)

On my case it is

![In a single picture](https://raw.githubusercontent.com/shadmazumder/Xcode/master/InOnePicture.png)

Where

shadmazumder is my username
Xcode is the projectname
master is the branch
InOnePicture.png is the image, On my case InOnePicture.png is in the root directory.

Converting characters to integers in Java

43 is the dec ascii number for the "+" symbol. That explains why you get a 43 back. http://en.wikipedia.org/wiki/ASCII

What's the difference between Html.Label, Html.LabelFor and Html.LabelForModel

suppose you need a label with text customername than you can achive it using 2 ways

[1]@Html.Label("CustomerName")

[2]@Html.LabelFor(a => a.CustomerName)  //strongly typed

2nd method used a property from your model. If your view implements a model then you can use the 2nd method.

How to get a cross-origin resource sharing (CORS) post request working

This is a summary of what worked for me:

Define a new function (wrapped $.ajax to simplify):

jQuery.postCORS = function(url, data, func) {
  if(func == undefined) func = function(){};
  return $.ajax({
    type: 'POST', 
    url: url, 
    data: data, 
    dataType: 'json', 
    contentType: 'application/x-www-form-urlencoded', 
    xhrFields: { withCredentials: true }, 
    success: function(res) { func(res) }, 
    error: function() { 
            func({}) 
    }
  });
}

Usage:

$.postCORS("https://example.com/service.json",{ x : 1 },function(obj){
      if(obj.ok) {
           ...
      }
});

Also works with .done,.fail,etc:

$.postCORS("https://example.com/service.json",{ x : 1 }).done(function(obj){
      if(obj.ok) {
           ...
      }
}).fail(function(){
    alert("Error!");
});

Server side (in this case where example.com is hosted), set these headers (added some sample code in PHP):

header('Access-Control-Allow-Origin: https://not-example.com');
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 604800');
header("Content-type: application/json");
$array = array("ok" => $_POST["x"]);
echo json_encode($array);

This is the only way I know to truly POST cross-domain from JS.

JSONP converts the POST into GET which may display sensitive information at server logs.

How can I list ALL grants a user received?

If you want more than just direct table grants (e.g., grants via roles, system privileges such as select any table, etc.), here are some additional queries:

System privileges for a user:

SELECT PRIVILEGE
  FROM sys.dba_sys_privs
 WHERE grantee = <theUser>
UNION
SELECT PRIVILEGE 
  FROM dba_role_privs rp JOIN role_sys_privs rsp ON (rp.granted_role = rsp.role)
 WHERE rp.grantee = <theUser>
 ORDER BY 1;

Direct grants to tables/views:

SELECT owner, table_name, select_priv, insert_priv, delete_priv, update_priv, references_priv, alter_priv, index_priv 
  FROM table_privileges
 WHERE grantee = <theUser>
 ORDER BY owner, table_name;

Indirect grants to tables/views:

SELECT DISTINCT owner, table_name, PRIVILEGE 
  FROM dba_role_privs rp JOIN role_tab_privs rtp ON (rp.granted_role = rtp.role)
 WHERE rp.grantee = <theUser>
 ORDER BY owner, table_name;

ORA-00054: resource busy and acquire with NOWAIT specified

You'll have to wait. The session that was killed was in the middle of a transaction and updated lots of records. These records have to be rollbacked and some background process is taking care of that. In the meantime you cannot modify the records that were touched.

How to represent empty char in Java Character class

char means exactly one character. You can't assign zero characters to this type.

That means that there is no char value for which String.replace(char, char) would return a string with a diffrent length.

pandas groupby sort within groups

You could also just do it in one go, by doing the sort first and using head to take the first 3 of each group.

In[34]: df.sort_values(['job','count'],ascending=False).groupby('job').head(3)

Out[35]: 
   count     job source
4      7   sales      E
2      6   sales      C
1      4   sales      B
5      5  market      A
8      4  market      D
6      3  market      B

Changing the child element's CSS when the parent is hovered

Use toggleClass().

$('.parent').hover(function(){
$(this).find('.child').toggleClass('color')
});

where color is the class. You can style the class as you like to achieve the behavior you want. The example demonstrates how class is added and removed upon mouse in and out.

Check Working example here.

Sql Query to list all views in an SQL Server 2005 database

Run this adding DatabaseName in where condition.

  SELECT TABLE_NAME, ROW_NUMBER() OVER(ORDER BY TABLE_NAME) AS 'RowNumber' 
  FROM INFORMATION_SCHEMA.VIEWS 
  WHERE TABLE_CATALOG = 'DatabaseName'

or remove where condition adding use.

  use DataBaseName

  SELECT TABLE_NAME, ROW_NUMBER() OVER(ORDER BY TABLE_NAME) AS 'RowNumber' 
  FROM INFORMATION_SCHEMA.VIEWS

Fastest way to check if a value exists in a list

7 in a

Clearest and fastest way to do it.

You can also consider using a set, but constructing that set from your list may take more time than faster membership testing will save. The only way to be certain is to benchmark well. (this also depends on what operations you require)

How can I make directory writable?

chmod +w <directory> or chmod a+w <directory> - Write permission for user, group and others
chmod u+w <directory> - Write permission for user
chmod g+w <directory> - Write permission for group
chmod o+w <directory> - Write permission for others

Try-catch block in Jenkins pipeline script

This answer worked for me:

pipeline {
  agent any
  stages {
    stage("Run unit tests"){
      steps {
        script {
          try {
            sh  '''
              # Run unit tests without capturing stdout or logs, generates cobetura reports
              cd ./python
              nosetests3 --with-xcoverage --nocapture --with-xunit --nologcapture --cover-package=application
              cd ..
              '''
          } finally {
            junit 'nosetests.xml'
          }
        }
      }
    }
    stage ('Speak') {
      steps{
        echo "Hello, CONDITIONAL"
      }
    }
  }
}

no target device found android studio 2.1.1

I had the same thing on Windows 7 where I had the device properly set and the driver installed, and I was routinely running on the device. Then suddenly I started getting this error every time. I opened the Edit Configurations dialog as described above, switched to an emulator, tried one run, then went to the same dialog and changed back to USB. Then if worked again.

Concatenate multiple node values in xpath

If you need to join xpath-selected text nodes but can not use string-join (when you are stuck with XSL 1.0) this might help:

<xsl:variable name="x">
    <xsl:apply-templates select="..." mode="string-join-mode"/>
</xsl:variable>
joined and normalized: <xsl:value-of select="normalize-space($x)"/>

<xsl:template match="*" mode="string-join-mode">
    <xsl:apply-templates mode="string-join-mode"/>
</xsl:template>    

<xsl:template match="text()" mode="string-join-mode">
    <xsl:value-of select="."/>
</xsl:template>

Binding IIS Express to an IP Address

Below are the complete changes I needed to make to run my x64 bit IIS application using IIS Express, so that it was accessible to a remote host:

iisexpress /config:"C:\Users\test-user\Documents\IISExpress\config\applicationhost.config" /site:MyWebSite
Starting IIS Express ...
Successfully registered URL "http://192.168.2.133:8080/" for site "MyWebSite" application "/"
Registration completed for site "MyWebSite"
IIS Express is running.
Enter 'Q' to stop IIS Express

The configuration file (applicationhost.config) had a section added as follows:

<sites>
  <site name="MyWebsite" id="2">
    <application path="/" applicationPool="Clr4IntegratedAppPool">
      <virtualDirectory path="/" physicalPath="C:\build\trunk\MyWebsite" />
    </application>
    <bindings>
      <binding protocol="http" bindingInformation=":8080:192.168.2.133" />
    </bindings>
  </site>

The 64 bit version of the .NET framework can be enabled as follows:

<globalModules>
    <!--
        <add name="ManagedEngine" image="%windir%\Microsoft.NET\Framework\v2.0.50727\webengine.dll" preCondition="integratedMode,runtimeVersionv2.0,bitness32" />
        <add name="ManagedEngineV4.0_32bit" image="%windir%\Microsoft.NET\Framework\v4.0.30319\webengine4.dll" preCondition="integratedMode,runtimeVersionv4.0,bitness32" />
    -->             
    <add name="ManagedEngine64" image="%windir%\Microsoft.NET\Framework64\v4.0.30319\webengine4.dll" preCondition="integratedMode,runtimeVersionv4.0,bitness64" />

Biggest differences of Thrift vs Protocol Buffers?

I think most of these points have missed the basic fact that Thrift is an RPC framework, which happens to have the ability to serialize data using a variety of methods (binary, XML, etc).

Protocol Buffers are designed purely for serialization, it's not a framework like Thrift.

List of zeros in python

If you want a function which will return an arbitrary number of zeros in a list, try this:

def make_zeros(number):
    return [0] * number

list = make_zeros(10)

# list now contains: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

How to make several plots on a single page using matplotlib?

To answer your main question, you want to use the subplot command. I think changing plt.figure(i) to plt.subplot(4,4,i+1) should work.

Hive query output to file

I agree with tnguyen80's response. Please note that when there is a specific string value in query better to given entire query in double quotes.

For example:

$hive -e "select * from table where city = 'London' and id >=100" > /home/user/outputdirectory/city details.csv

Git commit date

The show command may be what you want. Try

git show -s --format=%ci <commit>

Other formats for the date string are available as well. Check the manual page for details.

How do I check if a type is a subtype OR the type of an object?

If you're trying to do it in a Xamarin Forms PCL project, the above solutions using IsAssignableFrom gives an error:

Error: 'Type' does not contain a definition for 'IsAssignableFrom' and no extension method 'IsAssignableFrom' accepting a first argument of type 'Type' could be found (are you missing a using directive or an assembly reference?)

because IsAssignableFrom asks for a TypeInfo object. You can use the GetTypeInfo() method from System.Reflection:

typeof(BaseClass).GetTypeInfo().IsAssignableFrom(typeof(unknownType).GetTypeInfo())

How do I use reflection to invoke a private method?

Could you not just have a different Draw method for each type that you want to Draw? Then call the overloaded Draw method passing in the object of type itemType to be drawn.

Your question does not make it clear whether itemType genuinely refers to objects of differing types.

T-SQL string replace in Update

The syntax for REPLACE:

REPLACE (string_expression,string_pattern,string_replacement)

So that the SQL you need should be:

UPDATE [DataTable] SET [ColumnValue] = REPLACE([ColumnValue], 'domain2', 'domain1')

How to call VS Code Editor from terminal / command line

When installing on Windows, you will be prompted to add VS Code to your PATH.

I was trying to figure out how to open files with VS Code from the command line and I already had the capability - I just forgot I had already added it. You might already have it installed - check by navigating to a folder you want to open and running the command code . to open that folder.

git stash apply version

The keys into the stash are actually the stash@{n} items on the left. So try:

git stash apply stash@{0}

(note that in some shells you need to quote "stash@{0}", like zsh, fish and powershell).

Since version 2.11, it's pretty easy, you can use the N stack number instead of using stash@{n}. So now instead of using:

git stash apply "stash@{n}"

You can type:

git stash apply n

To get list of stashes:

git stash list

In fact stash@{0} is a revision in git that you can switch to... but git stash apply ... should figure out how to DTRT to apply it to your current location.

Razor-based view doesn't see referenced assemblies

There is a new configuration section that is used to reference namespaces for Razor views.

Open the web.config file in your Views folder, and make sure it has the following:

<configuration>
    <configSections>
        <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
            <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
            <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
        </sectionGroup>
    </configSections>

    <system.web.webPages.razor>
        <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <pages pageBaseType="System.Web.Mvc.WebViewPage">
            <namespaces>
                <add namespace="System.Web.Mvc" />
                <add namespace="System.Web.Mvc.Ajax" />
                <add namespace="System.Web.Mvc.Html" />
                <add namespace="System.Web.Routing" />
                <add namespace="SquishIt.Framework" />
                <add namespace="Your.Namespace.Etc" />
            </namespaces>
        </pages>
    </system.web.webPages.razor>
</configuration>

Alternatively, you can add using statements to your shared layout:

@using Your.Namespace.Etc;
<!DOCTYPE html>
<head>
....

After editing the Web.config, restart Visual Studio to apply the changes.

How to get the start time of a long-running Linux process?

 ps -eo pid,etime,cmd|sort -n -k2

Is there a difference between using a dict literal and a dict constructor?

These two approaches produce identical dictionaries, except, as you've noted, where the lexical rules of Python interfere.

Dictionary literals are a little more obviously dictionaries, and you can create any kind of key, but you need to quote the key names. On the other hand, you can use variables for keys if you need to for some reason:

a = "hello"
d = {
    a: 'hi'
    }

The dict() constructor gives you more flexibility because of the variety of forms of input it takes. For example, you can provide it with an iterator of pairs, and it will treat them as key/value pairs.

I have no idea why PyCharm would offer to convert one form to the other.

Docker remove <none> TAG images

To remove dangling images please use :

docker image rm $(docker images --format "{{.ID}}" --filter "dangling=true")

Please refer to my answer here for a more detailed description : https://unix.stackexchange.com/a/445664/292327

INFO: No Spring WebApplicationInitializer types detected on classpath

I also had the same problem. My maven had tomcat7 plugin but the JRE environment was 1.6. I changed my tomcat7 to tomcat6 and the error was gone.

What is The difference between ListBox and ListView

Listview derives from listbox control. One most important difference is listview uses the extended selection mode by default . listview also adds a property called view which enables you to customize the view in a richer way than a custom itemspanel. One real life example of listview with gridview is file explorer's details view. Listview with grid view is a less powerful data grid. After the introduction of datagrid control listview lost its importance.

Using NOT operator in IF conditions

It is generally not a bad idea to avoid the !-operator if you have the choice. One simple reason is that it can be a source of errors, because it is possible to overlook it. More readable can be: if(conditionA==false) in some cases. This mainly plays a role if you skip the else part. If you have an else-block anyway you should not use the negation in the if-condition.

Except for composed-conditions like this:

if(!isA() && isB() && !isNotC())

Here you have to use some sort of negation to get the desired logic. In this case, what really is worth thinking about is the naming of the functions or variables. Try to name them so you can often use them in simple conditions without negation.

In this case you should think about the logic of isNotC() and if it could be replaced by a method isC() if it makes sense.

Finally your example has another problem when it comes to readability which is even more serious than the question whether to use negation or not: Does the reader of the code really knows when doSomething() returns true and when false? If it was false was it done anyway? This is a very common problem, which ends in the reader trying to find out what the return values of functions really mean.

plot a circle with pyplot

Hello I have written a code for drawing a circle. It will help for drawing all kind of circles. The image shows the circle with radius 1 and center at 0,0 The center and radius can be edited of any choice.

## Draw a circle with center and radius defined
## Also enable the coordinate axes
import matplotlib.pyplot as plt
import numpy as np
# Define limits of coordinate system
x1 = -1.5
x2 = 1.5
y1 = -1.5
y2 = 1.5

circle1 = plt.Circle((0,0),1, color = 'k', fill = False, clip_on = False)
fig, ax = plt.subplots()
ax.add_artist(circle1)
plt.axis("equal")
ax.spines['left'].set_position('zero')
ax.spines['bottom'].set_position('zero')
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
plt.xlim(left=x1)
plt.xlim(right=x2)
plt.ylim(bottom=y1)
plt.ylim(top=y2)
plt.axhline(linewidth=2, color='k')
plt.axvline(linewidth=2, color='k')

##plt.grid(True)
plt.grid(color='k', linestyle='-.', linewidth=0.5)
plt.show()

Good luck

Trim last character from a string

string helloOriginal = "Hello! World!";
string newString = helloOriginal.Substring(0,helloOriginal.LastIndexOf('!'));

Check if a process is running or not on Windows with Python

Try this code:

import subprocess
def process_exists(process_name):
    progs = str(subprocess.check_output('tasklist'))
    if process_name in progs:
        return True
    else:
        return False

And to check if the process is running:

if process_exists('example.exe'):
    #do something

How to get the selected date of a MonthCalendar control in C#

"Just set the MaxSelectionCount to 1 so that users cannot select more than one day. Then in the SelectionRange.Start.ToString(). There is nothing available to show the selection of only one day." - Justin Etheredge

From here.

Change size of axes title and labels in ggplot2

To change the size of (almost) all text elements, in one place, and synchronously, rel() is quite efficient:
g+theme(text = element_text(size=rel(3.5))

You might want to tweak the number a bit, to get the optimum result. It sets both the horizontal and vertical axis labels and titles, and other text elements, on the same scale. One exception is faceted grids' titles which must be manually set to the same value, for example if both x and y facets are used in a graph:
theme(text = element_text(size=rel(3.5)), strip.text.x = element_text(size=rel(3.5)), strip.text.y = element_text(size=rel(3.5)))

How to Change color of Button in Android when Clicked?

public void onPressed(Button button, int drawable) {
            if (!isPressed) {
                button.setBackgroundResource(R.drawable.bg_circle);
                isPressed = true;
            } else {
                button.setBackgroundResource(drawable);
                isPressed = false;
            }
        }


    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.circle1:
                onPressed(circle1, R.drawable.bg_circle_gradient);
                break;
            case R.id.circle2:
                onPressed(circle2, R.drawable.bg_circle2_gradient);
                break;
            case R.id.circle3:
                onPressed(circle3, R.drawable.bg_circle_gradient3);
                break;
            case R.id.circle4:
                onPressed(circle4, R.drawable.bg_circle4_gradient);
                break;
            case R.id.circle5:
                onPressed(circle5, R.drawable.bg_circle5_gradient);
                break;
            case R.id.circle6:
                onPressed(circle6, R.drawable.bg_circle_gradient);
                break;
            case R.id.circle7:
                onPressed(circle7, R.drawable.bg_circle4_gradient);
                break;

        }

please try this, in this code i m trying to change the background of button on button click this works fine.

Transaction marked as rollback only: How do I find the cause

I struggled with this exception while running my application.

Finally the problem was on the sql query. i mean that the query is wrong.

please verify your query. This is my suggestion

Programs & Examples On #Junit3

Maven 3 and JUnit 4 compilation problem: package org.junit does not exist

The type java.lang.CharSequence cannot be resolved in package declaration

Can I remove the URL from my print css, so the web address doesn't print?

How to convert string to XML using C#

JWT (JSON Web Token) library for Java

What is the command for cut copy paste a file from one directory to other directory

install

usage

Does Hive have a String split function?

Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user

Why is Chrome showing a "Please Fill Out this Field" tooltip on empty fields?

How to calculate the inverse of the normal cumulative distribution function in python?

setting system property

Bootstrap dropdown menu not working (not dropping down when clicked)

Coerce multiple columns to factors at once

How Can I Set the Default Value of a Timestamp Column to the Current Timestamp with Laravel Migrations?

How to detect if CMD is running as Administrator/has elevated privileges?

animating addClass/removeClass with jQuery

How do I check if a variable is of a certain type (compare two types) in C?

How can I show three columns per row?

How do I set up HttpContent for my HttpClient PostAsync second parameter?

Spring,Request method 'POST' not supported

'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension method

Formula to check if string is empty in Crystal Reports

Multiple actions were found that match the request in Web Api

Getting the location from an IP address

How to change a TextView's style at runtime

Lightweight XML Viewer that can handle large files

python catch exception and continue try block

How to open remote files in sublime text 3

Accept server's self-signed ssl certificate in Java client

Option 1

Option 2

How do I fetch only one branch of a remote Git repository?

How to create an exit message

Reset input value in angular 2

Javascript Click on Element by Class

TypeError: no implicit conversion of Symbol into Integer

How can I recover the return value of a function passed to multiprocessing.Process?

How to join two sets in one line without using "|"

Extension mysqli is missing, phpmyadmin doesn't work

insert data into database using servlet and jsp in eclipse

getApplication() vs. getApplicationContext()

How to insert current_timestamp into Postgres via python

jQuery deferreds and promises - .then() vs .done()

COALESCE with Hive SQL

Get bottom and right position of an element

How do you find what version of libstdc++ library is installed on your linux machine?

How to bring view in front of everything?

How do I reference the input of an HTML <textarea> control in codebehind?

How do I "commit" changes in a git submodule?

check / uncheck checkbox using jquery?

What does "The following object is masked from 'package:xxx'" mean?

When two functions have the same name, which one gets called?

What if I want to use one of the masked functions?

How do I suppress the message?

Impact of R's Startup Procedures on Function Masking

How do I list all the masked functions?

How do I prevent name conflict bugs?

Disable Transaction Log

Choose File Dialog

Determine if a String is an Integer in Java

How can I pass POST parameters in a URL?

what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

Hibernate Group by Criteria Object

Disabling SSL Certificate Validation in Spring RestTemplate

Defining arrays in Google Scripts

Edit line thickness of CSS 'underline' attribute

Use of "instanceof" in Java

How do you push a Git tag to a branch using a refspec?

java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

How to remove leading whitespace from each line in a file

sed

The shell's while/read loop

Twitter Bootstrap add active class to li

How to Join to first row

OpenCV & Python - Image too big to display

Copy / Put text on the clipboard with FireFox, Safari and Chrome

Convert named list to vector with values only

The shell's `while`/`read` loop