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pandas: filter rows of DataFrame with operator chaining
...the boolean index.
In [96]: df
Out[96]:
A B C D
a 1 4 9 1
b 4 5 0 2
c 5 5 1 0
d 1 3 9 6
In [99]: df[(df.A == 1) & (df.D == 6)]
Out[99]:
A B C D
d 1 3 9 6
If you want to chain methods, you can add your own mask method and use that one.
In [90]: def mask(df, ke...
How to get an array of specific “key” in multidimensional array without looping
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265
Since php 5.5, you can use array_column:
$ids = array_column($users, 'id');
This is the prefe...
How to sort a list in Scala by two fields?
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answered Apr 5 '12 at 11:25
seniasenia
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Using numpy to build an array of all combinations of two arrays
...lementation:
@pv's solution
In [113]:
%timeit cartesian(([1, 2, 3], [4, 5], [6, 7]))
10000 loops, best of 3: 135 µs per loop
In [114]:
cartesian(([1, 2, 3], [4, 5], [6, 7]))
Out[114]:
array([[1, 4, 6],
[1, 4, 7],
[1, 5, 6],
[1, 5, 7],
[2, 4, 6],
[2, 4, 7],
...
Java `final` method: what does it promise?
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5 Answers
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Merge Images Side by Side(Horizontally)
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5 Answers
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How do I get the type name of a generic type argument?
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edited Aug 3 '18 at 15:24
cja
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answered ...
in_array multiple values
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answered Sep 24 '11 at 23:51
Mark ElliotMark Elliot
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Difference between `mod` and `rem` in Haskell
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answered May 4 '11 at 23:54
Fred FooFred Foo
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