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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...t, year + month ~ variable, sum)
# year month x1 x2
1 2000 1 -80.83405 -224.9540159
2 2000 2 -223.76331 -288.2418017
3 2000 3 -188.83930 -481.5601913
4 2000 4 -197.47797 -473.7137420
5 2000 5 -259.07928 -372.4563522
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How to check if array element exists or not in javascript?
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techfoobartechfoobar
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How to automatically indent source code?
How can I automatically indent source code in Visual Studio 2010?
7 Answers
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usr/bin/ld: cannot find -l
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If your library name is say libxyz.so and it is located on path say:
/home/user/myDir
then t...
What is the point of noreturn?
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edited May 10 '12 at 16:42
answered May 10 '12 at 16:27
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Remove property for all objects in array
... Denys SéguretDenys Séguret
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How to programmatically create and read WEP/EAP WiFi configurations in Android?
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Part 1: Creating a WEP WiFi configuration programmatically
This is pretty much straightforwa...
How do I parse command line arguments in Java?
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20 Answers
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Tree data structure in C#
...sn't one provided. An Extensive Examination of Data Structures Using C# 2.0 explains a bit about why. Is there a convenient library which is commonly used to provide this functionality? Perhaps through a strategy pattern to solve the issues presented in the article.
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Changing the maximum length of a varchar column?
...'m trying to update the length of a varchar column from 255 characters to 500 without losing the contents. I've dropped and re-created tables before but I've never been exposed to the alter statement which is what I believe I need to use to do this. I found the documentation here: ALTER TABLE (Tran...