FreeMat: FLIPUD Reverse the Columns of a Matrix

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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 =
     9 4 5 3
     8 9 7 4
     4 8 6 3
     6 7 0 9

    --> flipud(x)

    ans =
     6 7 0 9
     4 8 6 3
     8 9 7 4
     9 4 5 3

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

    --> x = int32(rand(4,4,3)*10)

    x =

    (:,:,1) =
      7  4  3  3
      0 10 10  6
      2  8  1  8
      1  1  9  8

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

    (:,:,3) =
      9  7  7  5
      8  9  5  6
      5 10  6  8
      4  2  8  3

    --> flipud(x)

    ans =

    (:,:,1) =
      1  1  9  8
      2  8  1  8
      0 10 10  6
      7  4  3  3

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

    (:,:,3) =
      4  2  8  3
      5 10  6  8
      8  9  5  6
      9  7  7  5