[Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter

[Rik]

Update of bug #41839 (project octave):

                  Status:                    None => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #5:

I reviewed your patch and checked it in here
(http://hg.savannah.gnu.org/hgweb/octave/rev/35a5e7740a6d).

sprand/sprandn had not been reviewed in a long time so I followed it up by
overhauling the functions in this changeset
(http://hg.savannah.gnu.org/hgweb/octave/rev/54a1e95365e1).

I did some tricks, like replacing the do/until loop with randperm and
pre-calculating the speye() portion of the U/V matrices outside the loop, to
speed things up.  Although the algorithm works, it seems pretty slow for large
matrices.


tic; x = sprand (1e3, 1e3, 0.3, 0.7); toc
Elapsed time is 11.2219 seconds.





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