Hello,
I am used to work with Matlab, but for economical reason I am switching to Octave. I tried ''as it is'' my matlab code in octave and it works! Now, on a test set of variables, Matlab needs 0.91 s while Octave 15 s. My question is: is it normal? Or maybe, even if it works, it is better to change the code (for instance ''end'' in Matlab to ''endfor'' or ''endif'')? What are your experience? Thank you very much! Lorenzo. 
Sorry,
maybe, considering the previous messages, it is needed to say that I am using some for loops. I tryied to vectorialize as much as possible, but I am working with a piecewise potential so I do not see any way to avoid some of them. Any hints? Thank you! 
On Thu, Apr 16, 2009 at 7:16 AM, lorenzosan <[hidden email]> wrote:
> > Sorry, > maybe, considering the previous messages, it is needed to say that I am > using some for loops. I tryied to vectorialize as much as possible, but I am > working with a piecewise potential so I do not see any way to avoid some of > them. > > Any hints? > Post the code. Maybe someone else will see a vectorized way. Also, loopy code can be quite easily handled in writing a DLD function in C++ to be called from Octave.  RNDr. Jaroslav Hajek computing expert & GNU Octave developer Aeronautical Research and Test Institute (VZLU) Prague, Czech Republic url: www.highegg.matfyz.cz _______________________________________________ Helpoctave mailing list [hidden email] https://wwwold.cae.wisc.edu/mailman/listinfo/helpoctave 
Thanks to all,
unfortunately I am not the only person who has written the code and I can not post it here! In the meanwhile I have avoided another loop with a series of floor and rem, may be not optimized but I have seen a slight improvement in Matlab but a good one in Octave. Now it is ''only'' twice slower. I think I will try C++, at the end... Thanks!

On Fri, Apr 17, 2009 at 8:02 AM, lorenzosan <[hidden email]> wrote:
> > Thanks to all, > unfortunately I am not the only person who has written the code and I can > not post it here! Maybe you can isolate just the bottlenecks and post them, or post an equivalent code to avoid violating copyright. > In the meanwhile I have avoided another loop with a series of floor and rem, > may be not optimized but I have seen a slight improvement in Matlab but a > good one in Octave. Now it is ''only'' twice slower. > > > I think I will try C++, at the end... > > Thanks! > that's up to you, of course, but maybe that's not needed. in any case without more information you can't get more help.  RNDr. Jaroslav Hajek computing expert & GNU Octave developer Aeronautical Research and Test Institute (VZLU) Prague, Czech Republic url: www.highegg.matfyz.cz _______________________________________________ Helpoctave mailing list [hidden email] https://wwwold.cae.wisc.edu/mailman/listinfo/helpoctave 
In reply to this post by lorenzosan
On 17 Apr 2009, at 08:02, lorenzosan wrote: > > Thanks to all, > unfortunately I am not the only person who has written the code and > I can > not post it here! > In the meanwhile I have avoided another loop with a series of floor > and rem, > may be not optimized but I have seen a slight improvement in Matlab > but a > good one in Octave. Now it is ''only'' twice slower. > > > I think I will try C++, at the end... Lorenzo, From your previous emails I deduced that 1) As you are not allowed to share the code of your prgram it probably is not free software 2) As you mentioned "end users", I believe your program is being distributed. if these assumptions are correct then consider that: "Code written using Octave's native plugin interface (also known as a .oct file) necessarily links with Octave internals and is considered a derivative work of Octave and therefore must be released under terms that are compatible with the GPL." [1] so if you distribute your code as .oct files you might be required to share the source. If my assumptions were incorrect then sorry for the noise. > Thanks! c. [1] http://www.nabble.com/proposedFAQentriesaboutlicensingtd22685608.html#a22685608 _______________________________________________ Helpoctave mailing list [hidden email] https://wwwold.cae.wisc.edu/mailman/listinfo/helpoctave 
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