[jitter] Re: Problems with speed of patch using Expr and Matrix

yeah, that's going to be slowwww (-er using expr and potentially
faster using jit.ops because of vector operations).  BTW, your last
cos has 0*PI*snorm[1] which will always be 1.

wes

On 8/1/07, Carl Knott <carl.knott at gmail.com> wrote:
>
> Okay I see. Though I'm not entirely sure what you mean by an optimized pipeline. Do you have a reference? Btw, just for clarification, this is one of my formulas.
>
> (-0.034886*pow(norm[0]\\,6)-0.087331*pow(norm[0]\\,5)+0.58852*pow(norm[0]\\,4)-0.024326*pow(norm[0]\\,3)-1.4418*pow(norm[0]\\,2)-0.00025598*norm[0]+1)*sin(norm[0]*2)*cos(0*PI*snorm[1])
>
> jeanfrancois.charles, ahh yes, I solved that one with a delay.
>
> Quote: wesley.hoke at gmail.com wrote on Wed, 01 August 2007 09:24
> ----------------------------------------------------
> > It's not creating a new matrix that's the problem, it's more than
> > likely the speed of jit.expr's evaluation.  It's not a fast object by
> > its very nature, especially if you have decently sized exressions.  If
> > you have a fixed number of expressions, I would recommend building an
> > optimized pipeline for each and switching between those.  If you're
> > using JAVA than this is fairly easy to do because you can make a
> > function for each expression and switch between them based on a
> > parameter.
> >
> > wes
> >
> > On 8/1/07, Carl Knott <carl.knott at gmail.com> wrote:
> > > Okay, I've looked at my patch again and it is not the 'virtual sand' that I orignally thought was the problem.
> > >
> > > [img]index.php?t=getfile&id=777&private=0[/img]
> > >
> > > I have 20 or so formula's in a java external. They are selected using values, n and m in inlet 2 and 3 - no processing at all. The selected formula is passed out of the outlet into jit.expr. As the formula is be passed into jit.expr it starts a bang, where a new matrix is also passed into jit.expr. If I scroll through the values n/m I get lots of slow down! I'm sure it has something to do with creating a new matrix for each expr! Though I dont know a better approach? Any ideas?
> > >
> > > Thanks.
> > >
> > >
> > >
> > >
> > >
> > >
> >
> ----------------------------------------------------
>
>
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