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What does .SD stand for in data.table in R
...history of baseball
fkt = c('teamIDBR', 'teamIDlahman45', 'teamIDretro')
# confirm that they're stored as `character`
Teams[ , sapply(.SD, is.character), .SDcols = fkt]
# teamIDBR teamIDlahman45 teamIDretro
# TRUE TRUE TRUE
If you're confused by the use of sapply here,...
How does the socket API accept() function work?
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Erlang's 99.9999999% (nine nines) reliability
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Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
...
What is `mt=8` in iTunes links for the App Store?
...values):
1 Music
2 Podcasts
3 Audiobooks
4 TV Shows
5 Music Videos
6 Movies
7 iPod Games
8 Mobile Software Applications
9 Ringtones
10 iTunes U
11 E-Books
12 Desktop Apps
So, to answer your question, the "mt=8" in iTunes links simply identifies it as being of type 'Mobile Sof...
How to programmatically take a screenshot on Android?
... // image naming and path to include sd card appending name you choose for file
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
// create bitmap screen capture
View v1 = getWindow().getDecorView().getRootView();
v1.se...
What is the maximum amount of RAM an app can use?
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What's the difference between deadlock and livelock?
...atedly
triggered. This can be avoided by
ensuring that only one process (chosen
randomly or by priority) takes action.
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How do I fix the Visual Studio compile error, “mismatch between processor architecture”?
...introduced with the new Visual Studio 11 Beta and .NET 4.5, although I suppose it might have been possible before.
First, it really is just a warning. It should not hurt anything if you are just dealing with x86 dependencies. Microsoft is just trying to warn you when you state that your project is ...
What makes a keychain item unique (in iOS)?
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