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How to sort a dataframe by multiple column(s)
... code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A 8 1
3 Hi A 9 1
Edit some 2+ years later: It was just asked how to do this by column index. The answer is to simply pass the desired sorting column(s) to the order() function:
R> dd[order(-dd[,4], dd[,1]), ...
gunicorn autoreload on source change
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edited Sep 2 at 5:30
Martlark
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How are GCC and g++ bootstrapped?
...re were others when it was written. The very first C compiler ever (ca. 1973, IIRC) was implemented either in PDP-11 assembly, or in the B programming language which preceded it, but in any case the B compiler was written in assembly. Similarly, the first ever C++ compiler (CPre/Cfront, 1979-1983) w...
Django: How to completely uninstall a Django app?
...ass():
print "deleting %s"%c # print(f"deleting {c}") # for Python 3.6+
c.delete()
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When should I mock?
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edited May 6 '13 at 18:33
Drew Stephens
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Path to Powershell.exe (v 2.0)
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I believe it's in C:\Windows\System32\WindowsPowershell\v1.0\. In order to confuse the innocent, MS kept it in a directory labeled "v1.0". Running this on Windows 7 and checking the version number via $Host.Version (Determine installed PowerShell version) show...
Map to String in Java
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answered May 13 '10 at 15:56
BalusCBalusC
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How to extract the decision rules from scikit-learn decision-tree?
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143
I believe that this answer is more correct than the other answers here:
from sklearn.tree impor...
How to add semicolon after method call when inside parameter list in IntelliJ IDEA?
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Build Maven Project Without Running Unit Tests
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answered Oct 22 '09 at 13:47
alphazeroalphazero
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