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

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..

Answer 1

[Jos (10584)]

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)

[Triveni]

I have to generate atleast 500 permutations....can i call Y_permuted for 50 times and store generated value??

[Jos (10584)]

No, change N. Each row of Y_permuted will hold a specific permutation.