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How to reorder data.table columns (without copying)
... 2 2
# [3,] 0.3297416 1 3
From ?setcolorder:
In data.table parlance, all set* functions change their input by reference. That is, no copy is made at all, other than temporary working memory, which is as large as one column.
so should be pretty efficient. See ?setcolorder for details.
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Stop Visual Studio from mixing line endings in files
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I don't have this menu item on my VS2010 ultimate install.
– Palantir
Oct 22 '10 at 8:16
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MIN and MAX in C
Where are MIN and MAX defined in C, if at all?
14 Answers
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How to implement an ordered, default dict? [duplicate]
...deredDict() and defaultdict() from collections in one object, which shall be an ordered, default dict .
Is this possible?
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Why cast an unused function parameter value to void?
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@Benoit what does casting to void actually do? Is its only function to show the compiler that you're intentionally ignoring something or does (void) actually do something and when the compiler sees it, it'll just count it as having done something with the variabl...
Build .so file from .c file using gcc command line
...lo.c
to do it in one step. – Jonathan Leffler
I also suggest to add -Wall to get all warnings, and -g to get debugging information, to your gcc commands. – Basile Starynkevitch
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How to configure postgresql for the first time?
I have just installed postgresql and I specified password x during installation.
When I try to do createdb and specify any password I get the message:
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How to refresh / invalidate $resource cache in AngularJS
..., thank you! Exactly what I was looking for. For those wondering, you can call $cacheFactory.get('$http').remove(key), with key being the relative URL of your resource (ex: /api/user/current/51a9020d91799f1e9b8db12f).
– Alexandre Bulté
Jun 12 '13 at 12:25
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Reference: Comparing PHP's print and echo
...hat while they appear to users as two distinct constructs, they are both really shades of echo if you get down to basics, i.e. look at the internal source code. That source code involves the parser as well as opcode handlers. Consider a simple action such as displaying the number zero. Whether you ...
Return from lambda forEach() in java
...ching player from the (ordered) stream but simply any matching item. This allows for better efficiency when there's parallelism involved.
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