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

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Triveni
Triveni 2016-3-3
评论： Jos (10584) 2016-3-4
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..

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Jos (10584)
Jos (10584) 2016-3-3
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)
  2 个评论
Triveni
Triveni 2016-3-3
编辑：Triveni 2016-3-4
I have to generate atleast 500 permutations....can i call Y_permuted for 50 times and store generated value??

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