numpy.matrix.argsort
method
- 
matrix.argsort(axis=-1, kind='quicksort', order=None)
- 
Returns the indices that would sort this array. Refer to numpy.argsortfor full documentation.See also - 
 numpy.argsort
- equivalent function
 
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Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.matrix.argsort.html