How do I sample a random value from a matrix?

2018 5 2
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更新时间：2018 5 2
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Let's say I have a random matrix:
A = rand(10,4)
How can I sample a random value from this matrix (without replacement)? Essentially how can I perform a randsample but for a matrix instead of a vector?

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Akira Agata
Akira Agata 2018-5-2

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If you want to obtain k samples randomly from A, the following will do that.
ind = randperm(numel(A),k);
output = A(ind);

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