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python numpy machine epsilon
... given float type is to use np.finfo():
print(np.finfo(float).eps)
# 2.22044604925e-16
print(np.finfo(np.float32).eps)
# 1.19209e-07
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How to count the frequency of the elements in an unordered list?
...tertools package if the list is an ordered list.
a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
from itertools import groupby
[len(list(group)) for key, group in groupby(a)]
Output:
[4, 4, 2, 1, 2]
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PHP: merge two arrays while keeping keys instead of reindexing?
...
564
You can simply 'add' the arrays:
>> $a = array(1, 2, 3);
array (
0 => 1,
1 => 2...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... return x*2, x*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]:
a b A1 A2
0 1 2 2 3
1 2 3 4 6
2 3 4 6 9
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Bootstrap 3 - Why is row class is wider than its container?
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edited Feb 4 '16 at 14:50
Seonghyeon Cho
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answered Sep ...
Reloading module giving NameError: name 'reload' is not defined
...module in Python 3, you should use either:
importlib.reload for Python 3.4 and above
imp.reload for Python 3.0 to 3.3 (deprecated since Python 3.4 in favour of importlib)
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What's the difference between tilde(~) and caret(^) in package.json?
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4053
See the NPM docs and semver docs:
~version “Approximately equivalent to version”, will u...
Remove all occurrences of a value from a list?
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524
Functional approach:
Python 3.x
>>> x = [1,2,3,2,2,2,3,4]
>>> list(filter((2...
What is sys.maxint in Python 3?
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martineau
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answered Dec 10 '12 at 5:58
Diego BaschDiego Basch
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Pass a data.frame column name to a function
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edited Apr 11 '16 at 21:42
joran
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answered...