MATLAB: How to sample a random value from a matrix

Question

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?

Answer 1

If you want to obtain k samples randomly from A, the following will do that.

ind = randperm(numel(A),k);
output = A(ind);