I need to randomly permute a set of data, and I need to do it 10,000 or more times, so I need to do it efficiently. Below is an example of how I'm doing it (with randomly generated data standing in for real data). I feel like there should be a way to vectorize the permutation process instead of the for-loop I'm using, but I can't think of how to do it. I need a method that works for any number of data points--i.e., below I am permuting two data points for each hypothetical subject, but I need to generalize to three, four, etc.
data = rand(24, 2);
for j = 1:24
perm_data(i, :) = data(i, randperm(2));