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Convert data.frame column format from character to factor
...e to the world of R.
mtcars #look at this built in data set
str(mtcars) #allows you to see the classes of the variables (all numeric)
#one approach it to index with the $ sign and the as.factor function
mtcars$am <- as.factor(mtcars$am)
#another approach
mtcars[, 'cyl'] <- as.factor(mtcars[...
Regex empty string or email
...hing an email address (that is, if you want wrong code that happens to (usually) work), use the regular-expressions.info link someone else submitted.
As for the empty string, ^$ is mentioned by multiple people and will work fine.
...
https connection using CURL from command line
... and Cacerts world and facing a problem while connecting to a server.
Basically, I need to test connectivity over https from one machine to another machine.
I have a URL to which I need to connect from Machine A (a linux machine)
I tried this on command prompt
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Avoid passing null as the view root (need to resolve layout parameters on the inflated layout's root
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I found a good article about LayoutInflater. The author explains how all the versions of the inflate method work and gives examples of ListView and AlertDialog
http://www.doubleencore.com/2013/05/layout-inflation-as-intended/
Update #1.
This answer recently helped me, too.
https://stackover...
SQL variable to hold list of integers
...an error saying the subquery returned more than one result and that is not allowed. Is there anyway to create a variable that will store an array if IDs from a subquery?
– Rafael Moreira
Jan 28 '16 at 15:24
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Vertical Text Direction
... the following property to your css.
white-space: pre;
So, the css class shall be
.vericaltext{
width:1px;
word-wrap: break-word;
font-family: monospace; /* this is just for good looks */
white-space: pre;/* this is for displaying whitespaces */
}
JSFiddle! Demo With Whitespace
Upda...
Android Studio quick documentation always “fetching documentation”
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The problem is Android Studio does not automatically update the source link of reference even when the documentation is already downloaded.
The default link in jdk.table.xml is http://developer.android.com/reference/ (android studio tries to connect to this online server ...
git replacing LF with CRLF
...ons transparently. And it does!
Bad news: value needs to be configured manually.
Good news: it should only be done ONE time per git installation (per project setting is also possible).
How autocrlf works:
core.autocrlf=true: core.autocrlf=input: core.autocrlf=false:
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grid controls for ASP.NET MVC? [closed]
...e some JQuery here and there for some niceties like pagination and that is all we really need.
If you need something a little more fully featured you could check out ExtJs grids here.
Also MvcContrib has a grid implementation that you could check out - try here. Or more specifically here.
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How to install a specific JDK on Mac OS X?
I want to install a specific JDK (the latest for example). For this, I went to the JDK download homepage: http://java.sun.com/javase/downloads/index.jsp .
I looked for a Mac version, but I'm a bit surprised to only see downloadable versions for Linux, Windows and Solaris ...
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