random
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I have a Matrix as follows
x = [1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20];
I want to generate a matrix from it that will be for example 100 combination of each element but for example for the first iteration, from first colum only one of them select then from the second as well then from the third as well and untill the end
so I may have like this
x = [ 6 2 18 4 20
16 17 3 4 10
and so on
采纳的回答
Andrei Bobrov
2012-6-6
x = [1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20];
EDIT after Mohammad's coment
[m,n] = size(x);
df = bsxfun(@plus,fullfact(m*ones(1,n)),(0:n-1)*m);
k = randperm(size(df,1));
out = x(df(k(1:min(100,numel(k))),:));
OR
[m,n] = size(x);
xc = mat2cell(x,m,ones(n,1));
cc = cell(1,n);
[cc{:}] = ndgrid(xc{:});
k = randperm(numel(cc{1}));
out = cell2mat(cellfun(@(x)x(k(1:min(100,numel(k)))'),cc,'un',0));
3 个评论
Niki
2012-6-6
Niki
2012-6-6
Andrei Bobrov
2012-6-6
full number of permutation for matricies with size m x n : N = m^n
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