How can I extract random data from a matrix?

Hi everyone.

I have a M rows by N columns matrix and I need to extract X random samples of it of the same size. I suposse is a simple task but I'm new at Matlab.

Thanks a lot.

Answer 1

[Azzi Abdelmalek]

A=rand(10,5) %your matrix aray
B=A(:)
X=20; %number of random sample
[v,idx]=sort(rand(1,numel(A)));
Samples=B(idx(1:X))

[Gerardo]

Thanks for your help Azzi, it works great.

[Azzi Abdelmalek]

using Sean Wolski suggestion (randperm)

   A=rand(10,5) %your matrix aray
   Samples=A(randperm(numel(A),20))

Answer 2

[Sean de Wolski]

doc randperm