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Generate matrices of the form [a b c d]

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laurie
laurie 2015-3-11
评论： Stephen23 2015-3-11
If I have matrices of the form [a b c d]
where
2<=a<=4
1<=b<=2
3<=c<=4
2<=d<=4
Could someone help me with the code/pseudo code to generate all possible matrices?
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Stephen23
Stephen23 2015-3-11
You can easily generate a cell array containing the requested permutations:
X = cell(1,4);
[~,X{:}] = ndgrid(1,2:4,1:2,3:4,2:4);
X = num2cell(cat(1,X{:}),1);

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Image Analyst
Image Analyst 2015-3-11
Of course you could just do a trivial, brute force way of 4 nested "for" loops, which I'm sure you can do. (If not, let us know.) But I'm thinking that you're wanting some more clever method, right? Or not right, and the trivial way is fine?
Oh well, here's the trivial way, just to save time:
for a = 2:4
for b = 1:2
for c = 3:4
for d = 2:4
out = [a,b,c,d]
end
end
end
end

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