numpy.flipud — NumPy v1.13 Manual (original) (raw)

numpy. flipud(m)[source]

Flip array in the up/down direction.

Flip the entries in each column in the up/down direction. Rows are preserved, but appear in a different order than before.

Parameters: m : array_like Input array.
Returns: out : array_like A view of m with the rows reversed. Since a view is returned, this operation is \mathcal O(1).

See also

fliplr

Flip array in the left/right direction.

rot90

Rotate array counterclockwise.

Notes

Equivalent to m[::-1,...]. Does not require the array to be two-dimensional.

Examples

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

A = np.random.randn(2,3,5) np.all(np.flipud(A) == A[::-1,...]) True

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