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Split column at delimiter in data frame [duplicate]
...),
+ bar=c('p|q', 'r|s', 's|t'), stringsAsFactors=F)
> transform(df, test=do.call(rbind, strsplit(foo, '|', fixed=TRUE)), stringsAsFactors=F)
id foo bar test.1 test.2
1 1 a|b p|q a b
2 2 b|c r|s b c
3 3 c|d s|t c d
Multiple columns:
> transform(df, lapp...
Changing the selected option of an HTML Select element
.... I used post-increment instead of pre-increment, and then I added another test which is slightly faster than your 3rd test.
– kzh
Nov 4 '13 at 14:03
1
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BackgroundWorker vs background Thread
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Only use CancelAsync (and test for CancellationPending if your thread will be polling on short intervals, if you want to have an exception raised instead, use a System.Threading.Thread.Abort() which raises an exception within the thread block itself, ...
How to connect to SQL Server database from JavaScript in the browser?
...iver={SQL Server};... connection string, but a named DSN was OK :
I set up TestDSN and it tested OK, and then var strConn= "DSN=TestDSN"; worked, so I carried on experimenting for my in-house testing and learning purposes.
Our server has several instances running, e.g. server1\dev and server1\Test ...
How can I pass data from Flask to JavaScript in a template?
...e';
</script>
<script type="text/javascript" src="/static/test123.js"></script>
If I input jinja variables in test123.js it doesn't work and you will get an error.
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Create module variables in Ruby
...name
end
end
Site.name # => "StackOverflow"
Site.setName("Test")
Site.name # => "Test"
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Writing Unicode text to a text file?
...file:
foo = u'Δ, Й, ק, م, ๗, あ, 叶, 葉, and 말.'
f = open('test', 'w')
f.write(foo.encode('utf8'))
f.close()
When you read that file again, you'll get a unicode-encoded string that you can decode to a unicode object:
f = file('test', 'r')
print f.read().decode('utf8')
...
Event handling for iOS - how hitTest:withEvent: and pointInside:withEvent: are related?
...clear as other documents, so here is my answer.
The implementation of hitTest:withEvent: in UIResponder does the following:
It calls pointInside:withEvent: of self
If the return is NO, hitTest:withEvent: returns nil. the end of the story.
If the return is YES, it sends hitTest:withEvent: message...
differences between 2 JUnit Assert classes
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The old method (of JUnit 3) was to mark the test-classes by extending junit.framework.TestCase. That inherited junit.framework.Assert itself and your test class gained the ability to call the assert methods this way.
Since version 4 of JUnit, the framework uses Annota...
Why is there no String.Empty in Java?
... anything into.
If you think there is a performance advantage, you should test it. If you don't think its worth testing for yourself, its a good indication it really isn't worth it.
It sounds like to you try to solve a problem which was solved when the language was designed more than 15 years ago...