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Mod of negative number is melting my brain
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arrayLength works fine for positive numbers but for negative numbers it all goes wrong.
12 Answers
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Difference between File.separator and slash in paths
...ies for dealing with files, you can safely use / (slash, not backslash) on all platforms. The library code handles translating things into platform-specific paths internally.
You might want to use File.separator in UI, however, because it's best to show people what will make sense in their OS, rath...
What is REST? Slightly confused [closed]
...ps go over it a few times slowly, but you will grasp the concept, it's actually not hard at all. People just have a tendency to explain it poorly.
– Anders
Jan 12 '11 at 0:01
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HTML 5: Is it , , or ?
I've tried checking other answers , but I'm still confused — especially after seeing W3schools HTML 5 reference .
27 An...
Check if value exists in Postgres array
...is works great. It has a side effect of automatic casting. Ex: SELECT 1::smallint = ANY ('{1,2,3}'::int[]) works. Just make sure to put ANY() on the right side of expression.
– Mike Starov
Jun 27 '12 at 23:52
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Tar a directory, but don't store full absolute paths in the archive
...-C works; just for clarification I'll post 2 examples:
creation of a tarball without the full path:
full path /home/testuser/workspace/project/application.war and what we want is just project/application.war so:
tar -cvf output_filename.tar -C /home/testuser/workspace project
Note: there is a ...
Convert column classes in data.table
...hat is the idiomatic way of doing this for a subset of columns (instead of all of them)? I've defined a character vector convcols of columns. dt[,lapply(.SD,as.numeric),.SDcols=convcols] is almost instant while dt[,convcols:=lapply(.SD,as.numeric),.SDcols=convcols] almost freezes up R, so I'm guessi...
Why does Git say my master branch is “already up to date” even though it is not?
I just deleted ALL the code from a file in my project and committed the change to my local git (on purpose). I did
7 Answe...
How do I exit the Vim editor?
...ite if there are changes)
:exit to write and exit (same as :x)
:qa to quit all (short for :quitall)
:cq to quit without saving and make Vim return non-zero error (i.e. exit with error)
You can also exit Vim directly from "Normal mode" by typing ZZ to save and quit (same as :x) or ZQ to just quit (...
Setting DEBUG = False causes 500 Error
...erver), and there is no error info in Apache error log and it will run normally when I change debug to True .
31 Answer...