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Can dplyr package be used for conditional mutating?
...mark might not be quite fair - in addition to not receiving the same input from the 2nd iteration forward (which might affect timing since DT$g is already allocated?), the result also propagates back to ans1 and therefore might (if R's optimizer deems it necessary? Not sure on this...) avoid another...
What is a postback?
...to web development and have seen the word postback thrown around. Coming from a non-web based background, what does a new web developer have to know about postbacks? (i.e. what are they and when do they arise?)
...
How to check if a Unix .tar.gz file is a valid file without uncompressing?
...e files integrity
http://linux.about.com/od/commands/l/blcmdl1_gzip.htm
from: http://unix.ittoolbox.com/groups/technical-functional/shellscript-l/how-to-test-file-integrity-of-targz-1138880
To test the gzip file is not corrupt:
gunzip -t file.tar.gz
To test the tar file inside is not corrupt:...
Count number of lines in a git repository
...stat 4b825dc642cb6eb9a060e54bf8d69288fbee4904
This shows the differences from the empty tree to your current working tree. Which happens to count all lines in your current working tree.
To get the numbers in your current working tree, do this:
git diff --shortstat `git hash-object -t tree /dev/...
Multiple actions were found that match the request in Web Api
...r in another way. Since you are saying that the methods are returning data from the same entity then just let the parameters do the describing for you.
For example your two methods could be turned into:
public HttpResponseMessage Get()
{
return null;
}
public HttpResponseMessage Get(MyVm vm)
...
Difference between outline and border
...
From: http://webdesign.about.com/od/advancedcss/a/outline_style.htm
The CSS outline property is a confusing property. When you first learn about it, it's hard to understand how it is even remotely different from the border p...
Determine installed PowerShell version
...
thank you! NB: On my XP where I manually upgraded from v1 Powershell, the actual folder and registry paths (misleadingly?!) reference v1 NOT v2. This is as others here specify, but it was the reason why I was so worried whether I had installed it. My path is ; C:\WINDOWS\sys...
React.js - input losing focus when rerendering
...t I was re-rendering the input on state change.
Buggy Code:
import React from 'react';
import styled from 'styled-components';
class SuperAwesomeComp extends React.Component {
state = {
email: ''
};
updateEmail = e => {
e.preventDefault();
this.setState({ email: e.target.valu...
The calling thread cannot access this object because a different thread owns it
... problem with people getting started. Whenever you update your UI elements from a thread other than the main thread, you need to use:
this.Dispatcher.Invoke(() =>
{
...// your code here.
});
You can also use control.Dispatcher.CheckAccess() to check whether the current thread owns the cont...
How do I print debug messages in the Google Chrome JavaScript Console?
...
Executing following code from the browser address bar:
javascript: console.log(2);
successfully prints message to the "JavaScript Console" in Google Chrome.
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