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How to add an extra column to a NumPy array
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b = np.zeros((N,N+1))
b[:,:-1] = a
And timings:
In [23]: N = 10
In [24]: a = np.random.rand(N,N)
In [25]: %timeit b = np.hstack((a,np.zeros((a.shape[0],1))))
10000 loops, best of 3: 19.6 us per loop
In [27]: %timeit b = np.zeros((a.shape[0],a.shape[1]+1)); b[:,:-1] = a
100000 loops, best of ...
Cast Int to enum in Java
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594
Try MyEnum.values()[x] where x must be 0 or 1, i.e. a valid ordinal for that enum.
Note that i...
Regular Expression for alphanumeric and underscores
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the Tin Man
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answered Dec 3 '08 at 4:33
CharlieCharlie...
Initialising an array of fixed size in python [duplicate]
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247
You can use:
>>> lst = [None] * 5
>>> lst
[None, None, None, None, None]
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Undefined method 'task' using Rake 0.9.0
I just updated Rake to the latest version ( 0.9.0.beta.4 ) and the rake command ends up with the following error message:
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Trim a string based on the string length
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answered Dec 14 '11 at 5:16
Stephen CStephen C
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GroupBy pandas DataFrame and select most common value
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141
You can use value_counts() to get a count series, and get the first row:
import pandas as pd
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Why does Java switch on contiguous ints appear to run faster with added cases?
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4 Answers
4
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Check if element exists in jQuery [duplicate]
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edited Oct 29 '15 at 11:48
Arslan Ali
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answered...
Rebuild or regenerate 'ic_launcher.png' from images in Android Studio
...some external .PNG file, and then when that dialog completes,
it generates 4 different pixel-sizes of images for use as
a launcher-icon.
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