numpy.intersect1d(ar1, ar2, assume_unique=False, return_indices=False)
[source]
Find the intersection of two arrays.
Return the sorted, unique values that are in both of the input arrays.
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See also
numpy.lib.arraysetops
>>> np.intersect1d([1, 3, 4, 3], [3, 1, 2, 1]) array([1, 3])
To intersect more than two arrays, use functools.reduce:
>>> from functools import reduce >>> reduce(np.intersect1d, ([1, 3, 4, 3], [3, 1, 2, 1], [6, 3, 4, 2])) array([3])
To return the indices of the values common to the input arrays along with the intersected values:
>>> x = np.array([1, 1, 2, 3, 4]) >>> y = np.array([2, 1, 4, 6]) >>> xy, x_ind, y_ind = np.intersect1d(x, y, return_indices=True) >>> x_ind, y_ind (array([0, 2, 4]), array([1, 0, 2])) >>> xy, x[x_ind], y[y_ind] (array([1, 2, 4]), array([1, 2, 4]), array([1, 2, 4]))
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.intersect1d.html