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Rank items in an array using Python/NumPy, without sorting array twice

... Use slicing on the left-hand side in the last step: array = numpy.array([4,2,7,1]) temp = array.argsort() ranks = numpy.empty_like(temp) ranks[temp] = numpy.arange(len(array)) This avoids sorting twice by inverting the permutation in the last step. ...
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How to get the difference between two arrays in JavaScript?

...:52 Ivar 4,0401111 gold badges3939 silver badges4747 bronze badges answered Jul 27 '09 at 11:20 ThinkerThinker...
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Find indices of elements equal to zero in a NumPy array

... numpy.where() is my favorite. >>> x = numpy.array([1,0,2,0,3,0,4,5,6,7,8]) >>> numpy.where(x == 0)[0] array([1, 3, 5]) share | improve this answer | fol...
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What is the Swift equivalent of isEqualToString in Objective-C?

... 434 With Swift you don't need anymore to check the equality with isEqualToString You can now use ...
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Pandas groupby: How to get a union of strings

... In [4]: df = read_csv(StringIO(data),sep='\s+') In [5]: df Out[5]: A B C 0 1 0.749065 This 1 2 0.301084 is 2 3 0.463468 a 3 4 0.643961 random 4 1 0.866521 string 5 2 0.120737 !...
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python dataframe pandas drop column using int

...| edited Feb 16 '16 at 10:48 frederikf 333 bronze badges answered Nov 30 '13 at 15:06 ...
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How do you echo a 4-digit Unicode character in Bash?

...can't figure out the magic incantation to make echo spit it, or any other, 4-digit Unicode character. Two-digit one's are easy. For example, echo -e "\x55", . ...
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Convert floats to ints in Pandas?

... df Out[33]: a 0 0.0000000 1 1.0000000 2 2.0000000 3 3.0000000 4 4.0000000 pd.options.display.float_format = '{:,.0f}'.format df Out[35]: a 0 0 1 1 2 2 3 3 4 4 share | improv...
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What is :: (double colon) in Python when subscripting sequences?

I know that I can use something like string[3:4] to get a substring in Python, but what does the 3 mean in somesequence[::3] ? ...
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How to create an array containing 1…N

... 409 If I get what you are after, you want an array of numbers 1..n that you can later loop through...