numpy.rot90#

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.This means for a 2D array with the defaultk andaxes, therotation will be counterclockwise.

Parameters:
marray_like

Array of two or more dimensions.

kinteger

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:
yndarray

A rotated view ofm.

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 ofrot90(m,k=1,axes=(0,1))

rot90(m,k=1,axes=(1,0)) is equivalent torot90(m,k=-1,axes=(0,1))

Examples

>>>importnumpyasnp>>>m=np.array([[1,2],[3,4]],int)>>>marray([[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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