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Module « numpy.matlib »

Fonction rot90 - module numpy.matlib

Signature de la fonction rot90

def rot90(m, k=1, axes=(0, 1)) 

Description

help(numpy.matlib.rot90)

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

Rotation direction is from the first towards the second axis.
This means for a 2D array with the default `k` and `axes`, the
rotation will be counterclockwise.

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.

Returns
-------
y : ndarray
    A rotated view of `m`.

See Also
--------
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
--------
>>> import numpy as np
>>> 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]]])

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