Hi Pierre,
I took a 25x32 matrix of random numbers between -1 and +1 and made a VST
plugin using this code. On my MacBook with Plogue Bidule as the host, it
uses about 3% of the CPU. Perhaps you can describe your application a bit.
Aaron
On Fri, Oct 10, 2014 at 1:42 PM, Pierre Lecomte <[email protected]>
wrote:
> Thank you for your solution !
> It's working for small matrix dimensions.
> I tried with a big matrix (32 inputs, 25 outputs) but unfortunately it's
> killing the CPU, lots of xruns, and no sound..
> Maybe an alternate solutions for big matrix .. ?
>
> Thanks
> Pierre
>
> > Pierre,
> >
> > There's probably a better way, but this works for what I need.
> >
> >
> > // bus with gains
> > gain(c) = R(c) with {
> > R((c,cl)) = R(c),R(cl);
> > R(1) = _;
> > R(0) = !;
> > //R(0) = !:0; // if you need to preserve the number of outputs
> > R(float(0)) = R(0);
> > R(float(1)) = R(1);
> > R(c) = *(c);
> > };
> >
> > // n = number of inputs
> > // m = number of output
> > matrix(n,m) = par(i,n,_) <: par(i,m,gain(a(i)):>_);
> >
> > a(0) = (0.5, -0.5, 1.1, 1.2,0);
> > a(1) = (1,2,3,4,-1);
> > a(2) = (0.5,0.5,0,0.25,1/3);
> > a(3) = (0,0,0,.1, sqrt(2));
> >
> > process = matrix(5,4);
> >
> > Aaron ([email protected])
> > Menlo Park, CA US
> >
> >
> > On Mon, Sep 22, 2014 at 8:12 AM, Pierre Lecomte <[email protected]
> >
> >
> > wrote:
> > > Hello,
> > >
> > > I would like to know if there is a easy-way to perform matrix
> > > multiplication in FAUST :
> > >
> > > More precisely, I would like to multiply N input audio streams by a
> > > constant matrix (M x N) to obtain M output audio streams :
> > >
> > > a0 a1 a2 in1 out1
> > > a3 a4 a5 X in2 = out2
> > >
> > > in3
> > >
> > > I would like to avoid to explicitely write the matrix operation :
> > > out1 = a0 in1 + a1 in2 + a2 in3, etc.
> > >
> > > Thank you for your help
> > >
> > > Pierre
>
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