#### Previous topic

numpy.roll

#### Next topic

Binary operations

# numpy.rot90

`numpy.``rot90`(m, k=1)

  Rotate an array by 90 degrees in the counter-clockwise direction.

  The first two dimensions are rotated; therefore, the array must be at least 2-D.

  Parameters : | m : array_like Array of two or more dimensions. k : integer Number of times the array is rotated by 90 degrees.
  Returns : | y : ndarray Rotated array.

  See also

  `fliplr`
    Flip an array horizontally.
  `flipud`
    Flip an array vertically.

  Examples

      >>> m = np.array([[1,2],[3,4]], int)
      >>> m
      array([[1, 2],
             [3, 4]])
      >>> np.rot90(m)
      array([[2, 4],
             [1, 3]])
      >>> np.rot90(m, 2)
      array([[4, 3],
             [2, 1]])