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From ND to 1D arrays
... np.ndarray.flat (for an 1D iterator):
In [12]: a = np.array([[1,2,3], [4,5,6]])
In [13]: b = a.ravel()
In [14]: b
Out[14]: array([1, 2, 3, 4, 5, 6])
Note that ravel() returns a view of a when possible. So modifying b also modifies a. ravel() returns a view when the 1D elements are contiguous i...
How to count the number of true elements in a NumPy bool array
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265
You have multiple options. Two options are the following.
numpy.sum(boolarr)
numpy.count_nonzer...
Converting a column within pandas dataframe from int to string
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Connect to a locally built Jekyll Server using mobile devices in the LAN
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edited May 5 at 17:24
answered May 17 '13 at 12:11
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Iterate a list with indexes in Python
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356
>>> a = [3,4,5,6]
>>> for i, val in enumerate(a):
... print i, val
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0 ...
Simple C example of doing an HTTP POST and consuming the response
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+50
A message has a header part and a message body separated by a blank line. The blank line is ALWAYS needed even if there is no messag...
How does numpy.histogram() work?
...n choose them automatically from the input, if none are specified. If bins=5, for example, it will use 5 bins of equal width spread between the minimum input value and the maximum input value.
The input values are 1, 2 and 1. Therefore, bin "1 to 2" contains two occurrences (the two 1 values), and ...
“ValueError: zero length field name in format” error in Python 3.0,3.1,3.2
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edited Apr 26 '15 at 22:12
answered Mar 27 '11 at 4:01
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What's the (hidden) cost of Scala's lazy val?
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answered Jun 15 '10 at 7:51
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Dynamically select data frame columns using $ and a character value
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185
You can't do that kind of subsetting with $. In the source code (R/src/main/subset.c) it states:...