(Ask again)Show every combination of N-dim vector.

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C Zeng 2012-5-24

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Hello, I asked it the day before yesterday but the code some expert told does not work well.

He wrote:

[C{1:N}]=ndgrid(0:2);
M=reshape(vertcat(C{:}),[],N);

However, it does show 3^N rows, but not every combination of N-dim vector of {0,1,2}. Is there another way to show all 3^N combinations and put it in a matrix?

Thank you so much!

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Sean de Wolski 2012-5-24

huh, your fullfact one is better anyway.

C Zeng 2012-5-25

Yes, Sean, your code gives 3^N rows, but they have repeated one. Also I do not understand what does it mean? It seems that it is going to construct a grid in graphics, right? But I want all factorial combinations.

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Daniel Shub 2012-5-24

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I will repeat the answer I gave to your original question

x = fullfact([3,3,3])-1

EDIT

For a general N

N = 3;
x = fullfact(repmat(3, N, 1))-1

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Daniel Shub 2012-5-25

See my edit.

C Zeng 2012-5-25

Oh, yes, or using combinator.m file:

combinator(3,N)-1

Thank you so much!

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Daniel Shub 2012-5-24

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I think http://www.mathworks.com/matlabcentral/fileexchange/10064-allcomb might do it also.

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