numpy.flip

numpy.flip(m, axis)

Reverse the order of elements in an array along the given axis.

The shape of the array is preserved, but the elements are reordered.

New in version 1.12.0.

Parameters:

m : array_like

Input array.

axis : integer

Axis in array, which entries are reversed.

Returns:

out : array_like

A view of m with the entries of axis reversed. Since a view is returned, this operation is done in constant time.

See also

flipud

Flip an array vertically (axis=0).

fliplr

Flip an array horizontally (axis=1).

Notes

flip(m, 0) is equivalent to flipud(m). flip(m, 1) is equivalent to fliplr(m). flip(m, n) corresponds to m[...,::-1,...] with ::-1 at position n.

Examples

>>> A = np.arange(8).reshape((2,2,2))
>>> A
array([[[0, 1],
        [2, 3]],

[[4, 5],

[6, 7]]])

>>> flip(A, 0)
array([[[4, 5],
        [6, 7]],

[[0, 1],

[2, 3]]])

>>> flip(A, 1)
array([[[2, 3],
        [0, 1]],

[[6, 7],

[4, 5]]])

>>> A = np.random.randn(3,4,5)
>>> np.all(flip(A,2) == A[:,:,::-1,...])
True