numpy.union1d(ar1, ar2)

Find the union of two arrays.

Return the unique, sorted array of values that are in either of the two input arrays.

Parameters :

ar1, ar2 : array_like

Input arrays. They are flattened if they are not already 1D.

Returns :

union : ndarray

Unique, sorted union of the input arrays.

See also

Module with a number of other functions for performing set operations on arrays.


>>> np.union1d([-1, 0, 1], [-2, 0, 2])
array([-2, -1,  0,  1,  2])

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