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crosscorr(array1, array2 [, axes, /keepdims])
Returns the cross-correlation coefficient between array1
and array2, which must both be numerical arrays (real or
complex) and must have the same dimensions. If axes is
specified, then the function returns cross-correlations of all samples
along the specified axes. The result lacks the dimensions listed in
axes, unless /keepdims is specified, in which case
the affected dimensions are replaced by dimensions of 1.