Vectorization with a loop and repmat

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yoshiyuki
yoshiyuki 2014-8-14
回答： Matt J 2014-8-14
i would like to vectoralize the following codes with loop;
n=5;
k=3;
x=(k:n)';
m=[];
for i = 1 : (n-k+1)
m=[m,x];
x=circshift(x,-1);
end
example;
k=3, n=5
3 4 5,
4 5 3,
5 3 4
please help me out

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采纳的回答

Michael Haderlein
Michael Haderlein 2014-8-14
That sounds like a nice cody task ;-) I'm sure there are dozens of solution, so my suggestion is:
m=k+mod(bsxfun(@(x,y) y+x,(0:n-k)',0:n-k),n-k+1);

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-8-14
编辑：Azzi Abdelmalek 2014-8-14
n=5;
k=3;
x=(k:n)'
idx=rem(bsxfun(@plus,(0:n-k)',(0:n-k)),n-k+1)+1
out=x(idx)
Matt J
Matt J 2014-8-14
y=k:n-1;
m = fliplr(toeplitz([n,y],[n,fliplr(y)]))

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