[Octave-bug-tracker] [bug #31709] simple routine which runs 20 times slower on octave vs. matlab!

[Rik]

Update of bug #31709 (project octave):

             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

See Appendix C.2 "Tips for Making Code Run Faster" in the Octave
documentation.  In general, you should avoid loops and vectorize the code. 
Matlab itself also has a very good reference on getting code to run faster
(http://www.mathworks.com/help/techdoc/matlab_prog/f8-784135.html).  

>From a cursory glance, I would try the following
1) Vectorize the inner loop.
2) Pre-allocate return arrays such as v to avoid repeated memory
allocations.
3) Use optimized library functions, such as find, rather than writing your
own code to search through vectors.

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