numpy.flipud#

numpy.flipud(m)[source]#

Reverse the order of elements along axis 0 (up/down).

For a 2-D array, this flips the entries in each column in the up/downdirection. Rows are preserved, but appear in a different order than before.

Parameters:

marray_like

Input array.

Returns:

outarray_like

A view ofm with the rows reversed. Since a view isreturned, this operation is\(\mathcal O(1)\).

See also

fliplr

Flip array in the left/right direction.

flip

Flip array in one or more dimensions.

rot90

Rotate array counterclockwise.

Notes

Equivalent tom[::-1,...] ornp.flip(m,axis=0).Requires the array to be at least 1-D.

Examples

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>>>importnumpyasnp>>>A=np.diag([1.0,2,3])>>>Aarray([[1.,  0.,  0.],       [0.,  2.,  0.],       [0.,  0.,  3.]])>>>np.flipud(A)array([[0.,  0.,  3.],       [0.,  2.,  0.],       [1.,  0.,  0.]])

>>>rng=np.random.default_rng()>>>A=rng.normal(size=(2,3,5))>>>np.all(np.flipud(A)==A[::-1,...])True

>>>np.flipud([1,2])array([2, 1])

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