fork download 
  1. function [nextc] = nextComb(oldc)
  2.    nextc = [];
  3.    o = find(oldc, 1);                 %// find the first one
  4.    z = find(~oldc(o+1:end), 1) + o;   %// find the first zero *after* the first one
  5.    if length(z) > 0
  6.       nextc = oldc;
  7.       nextc(1:z-1) = 0;
  8.       nextc(z) = 1;
  9.       nextc(1:nnz(oldc(1:z-2))) = 1;
  10.    else
  11.       nextc = zeros(size(oldc));
  12.       nextc(1:nnz(oldc)) = 1;         %// start over
  13.    end
  14. end
  15.  
  16. C = [1 2 3 4];
  17. n = 4; k = 2;
  18. nextCombination = zeros(1,n);
  19. nextCombination(1:k) = 1;
  20. allCombs(1,:) = C(find(nextCombination));
  21. for c = 2:nchoosek(n,k)   %// start from 2; we already have 1
  22.    nextCombination = nextComb(nextCombination);
  23.    allCombs(c,:) = C(find(nextCombination));
  24. end
  25. allCombs
  26.  
Success #stdin #stdout #stderr 0.19s 65080KB
comments (?)
stdin 
Standard input is empty
stdout 
allCombs =

   1   2
   1   3
   2   3
   1   4
   2   4
   3   4
stderr 
warning: time stamp for `/usr/share/octave/3.6.2/m/optimization/__all_opts__.m' is in the future
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https://ideone.com/99aoTG
language:
Octave (octave 4.4.1)
created:
8 years ago
visibility:
public

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