numpy.ediff1d()
numpy.ediff1d
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numpy.ediff1d(ary, to_end=None, to_begin=None)[source] -
The differences between consecutive elements of an array.
Parameters: ary : array_like
If necessary, will be flattened before the differences are taken.
to_end : array_like, optional
Number(s) to append at the end of the returned differences.
to_begin : array_like, optional
Number(s) to prepend at the beginning of the returned