## FLIPUD Reverse the Columns of a Matrix

Section: Array Generation and Manipulations

### USAGE

Reverses the rows of a matrix. The syntax for its use is

       y = flipud(x)

where `x` is matrix. If `x` is an N-dimensional array then the first dimension is reversed.

### Example

The following example shows `flipud` applied to a 2D matrix.

    --> x = int32(rand(4)*10)
    x =
      <int32>  - size: [4 4]

    Columns 1 to 4
     7  3  1  1
     1  4  4  3
     8  7  8  2
     5  3  1  8
    --> flipud(x)
    ans =
      <int32>  - size: [4 4]

    Columns 1 to 4
     5  3  1  8
     8  7  8  2
     1  4  4  3
     7  3  1  1

For a 3D array, note how the rows in each slice are flipped.

    --> x = int32(rand(4,4,3)*10)
    x =
      <int32>  - size: [4 4 3]
    (:,:,1) =

    Columns 1 to 4
     7  6  0  2
     7  8  6  9
     5  7  0  9
     3  6  9  4
    (:,:,2) =

    Columns 1 to 4
     8  6  9  5
     9  6  3  3
     3  4  5  4
     7  3  6  9
    (:,:,3) =

    Columns 1 to 4
     6  4  6  1
     3  6  6  8
     1  5  4  4
     7  9  6  6
    --> flipud(x)
    ans =
      <int32>  - size: [4 4 3]
    (:,:,1) =

    Columns 1 to 4
     3  6  9  4
     5  7  0  9
     7  8  6  9
     7  6  0  2
    (:,:,2) =

    Columns 1 to 4
     7  3  6  9
     3  4  5  4
     9  6  3  3
     8  6  9  5
    (:,:,3) =

    Columns 1 to 4
     7  9  6  6
     1  5  4  4
     3  6  6  8
     6  4  6  1