numpy.rot90 — NumPy v1.15 Manual (original) (raw)
numpy. rot90(m, k=1, axes=(0, 1))[source]¶
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. New in version 1.12.0. |
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| Returns: | y : ndarray A rotated view of m. |
See also
Reverse the order of elements in an array along the given axis.
Flip an array horizontally.
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]]])