numpy.rot90

numpy.rot90(m, k=1, axes=(0, 1))[源代码]

Rotate an array by 90 degrees in the plane specified by axes.

Rotation direction is from the first towards the second axis.

Parameters:
m : array_like

Array of two or more dimensions.

k : integer

Number of times the array is rotated by 90 degrees.

axes: (2,) array_like

The array is rotated in the plane defined by the axes. Axes must be different.

1.12.0 新版功能.

Returns:
y : ndarray

A rotated view of m.

参见

flip
Reverse the order of elements in an array along the given axis.
fliplr
Flip an array horizontally.
flipud
Flip an array vertically.

Notes

rot90(m, k=1, axes=(1,0)) is the reverse of rot90(m, k=1, axes=(0,1)) rot90(m, k=1, axes=(1,0)) is equivalent to rot90(m, k=-1, axes=(0,1))

Examples

>>> m = np.array([[1,2],[3,4]], int)
>>> m
array([[1, 2],
       [3, 4]])
>>> np.rot90(m)
array([[2, 4],
       [1, 3]])
>>> np.rot90(m, 2)
array([[4, 3],
       [2, 1]])
>>> m = np.arange(8).reshape((2,2,2))
>>> np.rot90(m, 1, (1,2))
array([[[1, 3],
        [0, 2]],
       [[5, 7],
        [4, 6]]])