# Generate matrices of the form [a b c d]

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laurie il 11 Mar 2015
Commentato: Stephen23 il 11 Mar 2015
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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laurie il 11 Mar 2015
yes they are whole numbers
Stephen23 il 11 Mar 2015
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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### Risposta accettata

Image Analyst il 11 Mar 2015
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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laurie il 11 Mar 2015
I thought of this, but was wondering if there was another way...

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