How to get random values from a matrix
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Iftekharuddin Syed
on 10 Nov 2020
Commented: Bruno Luong
on 10 Nov 2020
There is a matrix A (size:12x1000)
How can I select 5 random entries out of 1000( from a matrix of size 12x1000), with each randomly selected value contains all the 12 rows from the original matrix. And store it into another matrix of size 12x5.
Can anyone help me with the code.
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Accepted Answer
Ameer Hamza
on 10 Nov 2020
You can use randperm() in a for-loop
M = rand(12, 1000);
rand_elements = zeros(12, 5);
for i = 1:12
idx = randperm(1000, 5);
rand_elements(i,:) = M(i, idx);
end
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More Answers (2)
Bruno Luong
on 10 Nov 2020
rcols = randperm(size(A,2),5);
B = A(:,rcols)
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Bruno Luong
on 10 Nov 2020
I just interpret the question like this. I don't know if it's what OP wants or not.
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