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C++ API

: rot90 (A)

: rot90 (A, k)

Rotate array by 90 degree increments.

Return a copy of A with the elements rotated counterclockwise in 90-degree increments.

The second argument is optional, and specifies how many 90-degree rotations are to be applied (the default value is 1). Negative values of k rotate the matrix in a clockwise direction. For example,

rot90 ([1, 2; 3, 4], -1)
    ⇒  3  1
        4  2

rotates the given matrix clockwise by 90 degrees. The following are all equivalent statements:

rot90 ([1, 2; 3, 4], -1)
rot90 ([1, 2; 3, 4], 3)
rot90 ([1, 2; 3, 4], 7)

The rotation is always performed on the plane of the first two dimensions, i.e., rows and columns. To perform a rotation on any other plane, use rotdim.

See also: rotdim, fliplr, flipud, flip.

Package: octave