nlcpy.flip

nlcpy.flip(m, axis=None)

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

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

Parameters

marray_like

Input array.

axisNone or int or tuple of ints, optional

Axis or axes along which to flip over. The default, axis=None, will flip over all of the axes of the input array. If axis is negative it counts from the last to the first axis. If axis is a tuple of ints, flipping is performed on all of the axes specified in the tuple.

Returns

outndarray

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

参考

flipud

Flips array in the up/down direction.

fliplr

Flips array in the left/right direction.

注釈

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.

flip(m) corresponds to m[::-1,::-1,...,::-1] with ::-1 at all positions.

flip(m, (0, 1)) corresponds to m[::-1,::-1,...] with ::-1 at position 0 and position 1.

Examples

>>> import nlcpy as vp
>>> A = vp.arange(8).reshape((2,2,2))
>>> A
array([[[0, 1],
        [2, 3]],

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

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

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

       [[3, 2],
        [1, 0]]])
>>> vp.flip(A, (0, 2))
array([[[5, 4],
        [7, 6]],

       [[1, 0],
        [3, 2]]])
>>> A = vp.random.randn(3, 4, 5)
>>> vp.all(vp.flip(A, 2) == A[:, :, ::-1, ...])
array(True)