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

[Eduardo Ramos Fernández]

Follow-up Comment #6, bug #41839 (project octave):

Rik that definitly looks better. I have tried at college your test case plus
one with n and m being 2e3 in both Matlab and Octave (same pc).


Matlab:
>> tic; x = sprand (1e3, 1e3, 0.3, 0.7); toc
Elapsed time is 4.792556 seconds.

>> tic; x = sprand (2e3, 2e3, 0.3, 0.7); toc
Elapsed time is 48.590979 seconds.

Octave:
octave:42> tic; x = sprand (1e3, 1e3, 0.3, 0.7); toc
Elapsed time is 7 seconds.

octave:43> tic; x = sprand (2e3, 2e3, 0.3, 0.7); toc
Elapsed time is 56 seconds.



As you can see there is not such a difference in execution times between
Matlab's version and ours, so I am not unhappy. But yes it is not the fastest
algorithm for large matrices. Maybe a C++ implementation would speed up things
for the critical part of the code.

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