MATLAB: How to extract random data from a matrix

random sample

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.

Best Answer

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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MATLAB: How to select random rows from a matrix and delete it from the original matrix for another random selection.

A=rand(100); % a random matrix
n=10;. 
idx=randsample(1:size(A,1),n) ;
B = A(idx,:) ; % pick rows randomly 
A(idx,:)=[]; % remove those rows
idx = randsample(1:size(A,1),n) ;
C= A(idx,:);

MATLAB: How to generate multiple random samples of size 200

rnv=randn(200,1000); % generate 1000 column samples of 200

Refer to the subsample sets as rnv(:,idx) where idx is the desired sample number. Don't even think of trying to build named variables for this.

Best Answer

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MATLAB: How to select random rows from a matrix and delete it from the original matrix for another random selection.

MATLAB: How to generate multiple random samples of size 200

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