Generate nchoosek vectors line-by-line

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Howard Wilton
Howard Wilton 2022-5-28
回答： Bjorn Gustavsson 2022-5-28
I would like to interate through combinations according to the code,
combos = nchoosek(1:512,6);
for c = 1:size(combos,1)
% code
end
However, the number of combinations, 2.4295e+13, is too big. Is there a way to generate the combinations line-by-line? I have no intention of running code for every single one, but I would like to index and get a specific combination for that index.

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回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2022-5-28
There are loads of nchoosek functions available on the file exchange: nchoosek. Some of those should help you with this. I recall using versions by Jos, Bruno Luong, or/and Jan.
HTH

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