Finally it worked with the solution proposed by Aaron.. after an other
compilation..
I tried yours as well, but with 25*32 = 800 coefficients in the coeffs vector,
Faust doesn't want to compile.
Anyway the first solution is working for my use
Thank you a lot
Pierre
> How about this?
>
> import("music.lib");
>
> M = 4; // Number of rows
> N = 3; // Number of columns
>
> // 4x3 matrix of gains:
> coeffs = (
> 1, 2, 3,
> 4, 5, 6,
> 7, 8, 9,
> 10,11,12
> );
>
> row(i) = (bus(N) , (par(col,N,coeffs:selector(N*i+col,N*M))) :
> interleave(N,2)) : par(i,N,*) :> _;
> process = bus(N) <: par(i,M,row(i));
>
> At 01:42 PM 10/10/2014, Pierre Lecomte 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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> Professor of Music and, by courtesy, Electrical Engineering
> CCRMA, Stanford University
> http://ccrma.stanford.edu/~jos/
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