[Octave-bug-tracker] [bug #50426] perms() sort order different than Matlab

[Rik]

Follow-up Comment #10, bug #50426 (project octave):

I benchmarked the old and new perms functions.  The new function is slightly
faster, about 16% improvement at N = 10.

bm_perms.m code


N = 50;

bm = zeros (N, 1);
x = zeros (3628800, 10); 

for i = 1:N
  tic;
#  x = perms (1:10);
  x = perms_new (1:10);
  bm(i) = toc;
endfor


Results
perms : median = .189
perms_new : median = .157
-16.9% improvement

If I switch to using 'uint8' then the median is .187 which basically erases
any savings.

So, I think this just needs to be updated to follow Octave coding
conventions.


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