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What does the “@” symbol mean in reference to lists in Haskell?
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edited Jul 20 '09 at 14:26
answered Jul 20 '09 at 13:10
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Laravel - Eloquent or Fluent random row
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edited Aug 20 at 13:45
D Malan
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an...
Redirecting to previous page after authentication in node.js using passport.js
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answered Nov 11 '12 at 22:20
chovychovy
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php static function
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edited Dec 20 '14 at 3:01
Makyen♦
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How to sum all the values in a dictionary?
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edited Sep 23 '19 at 20:51
answered Feb 2 '11 at 23:02
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
... if (l == 0)
{
Canny(gray0, gray, 10, 20, 3); //
// Dilate helps to remove potential holes between edge segments
dilate(gray, gray, Mat(), Point(-1,-1));
}
else
{
gray = gra...
How do I build a numpy array from a generator?
... allocation.
– Cuadue
Feb 19 '13 at 20:50
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Why numpy.array doesn't do the memory allocation the ...
How to install node.js as windows service?
... CoreyCorey
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How to develop or migrate apps for iPhone 5 screen resolution?
... if it exists.
– tvon
Sep 13 '12 at 20:34
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Is adding "Default-568h@2x.png" enough or are there a...
Multiple aggregations of the same column using pandas GroupBy.agg()
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You can simply pass the functions as a list:
In [20]: df.groupby("dummy").agg({"returns": [np.mean, np.sum]})
Out[20]:
mean sum
dummy
1 0.036901 0.369012
or as a dictionary:
In [21]: df.groupby('dummy').agg({'returns':
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