# rot90

## Purpose

Rotate matrix 90°.

## Synopsis

    B = rot90(A)
    B = rot90(A,k)

## Description

`B` `=` `rot90(A)` rotates the matrix `A` counterclockwise by 90 degrees.

`B` `=` `rot90(A,k)` rotates the matrix `A` counterclockwise by `k*90` degrees. `k` must be an integer.

## Examples

The matrix

    X =
        1    2    3
        4    5    6
        7    8    9

rotated by 90 degrees is

    Y = rot90(X)

    Y =
        3    6    9
        2    5    8
        1    4    7

## See Also

    fliplr, flipud, reshape

(c) Copyright 1994 by The MathWorks, Inc.