numpy.union1d(ar1, ar2) [source]
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:
union1d : ndarray Unique, sorted union of the input arrays. See also
numpy.lib.arraysetops Module with a number of other functions for performing set operations on arrays. Examples >>> np.union1d([-1, 0, 1], [-2, 0, 2])
a