Sort bidimentional numpy array

Question

The numpy arrays symbols and ocurrence both have the same size/len.

bidimentional_array = np.array([symbols,occurrence])

What I want is, do a descending sort in ocurrence and make it so that symbols index will change in function of the sort. What's the most effective way?

possible duplicate of Sort NumPy float array column by column — YXD
– YXD, Commented Apr 18, 2015 at 14:20

Saullo G. P. Castro · Accepted Answer · 2015-04-19 11:35:26Z

1

Use np.argsort to obtain the sorting indices according to the second column and fancy indexing to obtain the sorted array:

bidimentional_array = bidimentional_array[np.argsort(bidimentional_array[:,1])]

To reverse the sorted array:

bidimentional_array = bidimentional_array[::-1]

edited Apr 19, 2015 at 11:35

answered Apr 18, 2015 at 14:02

Saullo G. P. Castro

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