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how does multiplication differ for NumPy Matrix vs Array classes?
...find it more trouble than it's worth, though.
For arrays (prior to Python 3.5), use dot instead of matrixmultiply.
E.g.
import numpy as np
x = np.arange(9).reshape((3,3))
y = np.arange(3)
print np.dot(x,y)
Or in newer versions of numpy, simply use x.dot(y)
Personally, I find it much more read...
How to find the installed pandas version
...
375
Check pandas.__version__:
In [76]: import pandas as pd
In [77]: pd.__version__
Out[77]: '0.1...
How can I get the intersection, union, and subset of arrays in Ruby?
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3 Answers
3
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Is it possible to use 'else' in a list comprehension? [duplicate]
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337
The syntax a if b else c is a ternary operator in Python that evaluates to a if the condition ...
How to randomly select an item from a list?
..., 'horse', 'staple']
print(secrets.choice(foo))
secrets is new in Python 3.6, on older versions of Python you can use the random.SystemRandom class:
import random
secure_random = random.SystemRandom()
print(secure_random.choice(foo))
...
How do I override nested NPM dependency versions?
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243
You can use npm shrinkwrap functionality, in order to override any dependency or sub-dependency....
Finding the index of elements based on a condition using python list comprehension
... of a list.
>>> import numpy
>>> a = numpy.array([1, 2, 3, 1, 2, 3])
>>> a
array([1, 2, 3, 1, 2, 3])
>>> numpy.where(a > 2)
(array([2, 5]),)
>>> a > 2
array([False, False, True, False, False, True], dtype=bool)
>>> a[numpy.where(a > 2...
Converting JavaScript object with numeric keys into array
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328
It's actually very straight forward with jQuery's $.map
var arr = $.map(obj, function(el) { r...
How can I create a Set of Sets in Python?
... answered May 9 '11 at 0:18
a3nma3nm
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How would you implement an LRU cache in Java?
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edited Aug 10 '10 at 16:36
answered Dec 23 '09 at 15:43
H...