How can I extract random data from a matrix?

2012 9 14
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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.

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Azzi Abdelmalek
Azzi Abdelmalek 2012-9-14
编辑：Azzi Abdelmalek 2012-9-14

0 个投票

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))

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Gerardo
Gerardo 2012-9-16
Thanks for your help Azzi, it works great.
Azzi Abdelmalek
Azzi Abdelmalek 2012-9-16
using Sean Wolski suggestion (randperm)
A=rand(10,5) %your matrix aray
Samples=A(randperm(numel(A),20))

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