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 = 
  0  7  2  6 
  5  7 10  1 
  2  6  8  0 
  1  0  9  8 

--> flipud(x)

ans = 
  1  0  9  8 
  2  6  8  0 
  5  7 10  1 
  0  7  2  6

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

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

x = 

(:,:,1) = 
  8  4  6  7 
  6  0  7  6 
  8  9  9  0 
  1  2 10  5 

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

(:,:,3) = 
  3  1  5  0 
  0  6  5  1 
  9  4  9  2 
  6 10  8 10 

--> flipud(x)

ans = 

(:,:,1) = 
  1  2 10  5 
  8  9  9  0 
  6  0  7  6 
  8  4  6  7 

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

(:,:,3) = 
  6 10  8 10 
  9  4  9  2 
  0  6  5  1 
  3  1  5  0