numpy.matrix.searchsorted
method
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matrix.searchsorted(v, side='left', sorter=None)
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Find indices where elements of v should be inserted in a to maintain order. For full documentation, see numpy.searchsortedSee also - 
 numpy.searchsorted
- equivalent function
 
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    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.matrix.searchsorted.html