MATLAB: How to generate 500 permutations of any vector length 20? I am getting error

MATLAB

y = [45 45 45 45 45 45 0 0 30 30 0 0 0 0 45 45 45 45 45 45];
[count,element]  = hist(y,unique(y));
N1 = 5000;
x1 = permute(randi(numel(y), [1 20 N1]),[3 2 1]);
y = y(x1);
out = y(sum([ones(size(y,1),1),diff(sort(y,2),[],2)~=0],2) >= 3,:);
I am getting wrong result…I want to present 2 numbers of 30, 6 numbers of 0 and 12 numbers of 45…in every row..

Best Answer

To generate one permutation of y you can use randperm
Y = [45 45 45 45 45 45 0 0 30 30 0 0 0 0 45 45 45 45 45 45];
R = randperm(numel(Y)) % indices into y in random order
Y_permuted = Y(R)
To generate multiple rows of indices
N = 10 ; 
[~, R] = sort(rand(N,numel(Y)),2) 
Y_permuted = Y(R)
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