Function Reference
— Function File: rot90 (x, n)

Return a copy of x 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 n 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)

Due to the difficulty of defining an axis about which to rotate the matrix rot90 only work with 2-D arrays. To rotate N-d arrays use rotdim instead.