راه1:

reverse matrix: x=[1 3 8 20 100 121] -> y=[121 100 20 8 3 1]
x=[1 3 8 20 100 121];
r = randperm(length(x));
t1 = x(r);
[t2,t3] = sort(r,'descend');
y = t1(t3);

راه2: 

x=[1 3 8 20 100 121];y=x(end:-1:1)

راه 3:

fliplr - Flip matrix left to right

Syntax

Description

B = fliplr(A) returns A with columns flipped in the left-right direction, that is, about a vertical axis.

If A is a row vector, then fliplr(A) returns a vector of the same length with the order of its elements reversed. If A is a column vector, then fliplr(A) simply returns A.

Examples

If A is the 3-by-2 matrix,

A =
    1    4
    2    5
    3    6

then fliplr(A) produces

    4    1
    5    2
    6    3

If A is a row vector,

A =
    1    3    5    7    9

then fliplr(A) produces

    9    7    5    3    1

Limitations

The array being operated on cannot have more than two dimensions. This limitation exists because the axis upon which to flip a multidimensional array would be undefined.

See Also

flipdim | flipud | rot90

به نقل از:

http://www.mathworks.co.uk/help/techdoc/ref/fliplr.html