count unique values numpy

import numpy as np

x = np.array([1,1,1,2,2,2,5,25,1,1])
unique, counts = np.unique(x, return_counts=True)

print np.asarray((unique, counts)).T

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Veepsk 80 points

                                    &gt;&gt;&gt; a = np.array(['a', 'b', 'b', 'c', 'a'])
&gt;&gt;&gt; u, indices = np.unique(a, return_index=True)
&gt;&gt;&gt; u
array(['a', 'b', 'c'], dtype='&lt;U1')
&gt;&gt;&gt; indices
array([0, 1, 3])
&gt;&gt;&gt; a[indices]
array(['a', 'b', 'c'], dtype='&lt;U1')

Thank you! 0

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Mediterranean 105 points

                                    number_list = numpy.array([1, 1, 2, 3, 4, 4, 1])
(unique, counts) = numpy.unique(number_list, return_counts=True)

Thank you! 2

4 (2 Votes)

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