[Gambas-user] curve fitting library ?

Wally wally at ...2037...
Mon Jan 23 19:09:14 CET 2012 

Marcin Wojdyr , author of fityk told me he will post his opinion 
directlty here to the mailinglist today or tomorrow.

On Monday, January 23, 2012 09:59:16 Randall Morgan wrote:
> Thanks, Wally.
> 
> I'll go over both but get back to me once you have an answer from the
> author of fityk. I would still love to see a plot and GSL module for
> Gambas. But fityk looks like a lot less work right now. GSL has grown quite
> a bit since I last used it.
> 
> On Mon, Jan 23, 2012 at 4:29 AM, Wally <wally at ...2037...> wrote:
> > The spline example is member of Gambas3 examples
> > "Examples-> Drawing->GSLSpline"
> > or see attachment
> > 
> > I'll try to contact the author of fityk to get his opinion about what
> > we want to do. Fityk seems more clear and easier to implement.
> > On the other hand GSL covers a much wider range of functionality.
> > 
> > On Monday, January 23, 2012 03:42:32 Randall Morgan wrote:
> > > I don't think this app is licensed OSS. So I am not sure if you can
> > 
> > legally
> > 
> > > write a module with it. The GSL or similar library is the way to go.
> > > 
> > > I have my plate full at the moment but I will try to give you as
> > > much guidance as I can. Be forewarned I too am still learning. Give
> > > me a day or two to go over the GSL and then we'll see what we can
> > > get done.
> > > 
> > > send me your demo of the spline as well.
> > > 
> > > On Mon, Jan 23, 2012 at 3:29 AM, Wally <wally at ...2037...> wrote:
> > > > Randall, Benoit
> > > > 
> > > > this example, using the spline stuff from the GSL is one of the
> > > > most
> > > > simple functions in GSL. All the intersting rest is much more
> > > > confusing.
> > > > 
> > > > Have a look how easy fityk doing a peakfind on very noisy data:
> > > > (not sure the mailinglist allow me to attach screenshots )
> > > > honmepage: fityk.nieto.pl
> > > > 
> > > > On the other hand this fityk is not really free opensource i
> > > > think.
> > > > 
> > > > But here is a code example of guessing gaussian peak from a
> > > > clean exp function:
> > > > 
> > > > #include <iostream>
> > > > #include <cmath>
> > > > 
> > > > #include <fityk.h>
> > > > 
> > > > using namespace std;
> > > > using namespace fityk;
> > > > 
> > > > int main()
> > > > {
> > > > 
> > > >    Fityk *f = new Fityk;
> > > >    cout << f->get_info("version", true) << endl;
> > > >    cout << "ln(2) = " << f->calculate_expr("ln(2)") << endl;
> > > >    const double mu = 12.345;
> > > >    for (int i = 0; i != 500; ++i) {
> > > >    
> > > >        double x = i / 100. + 10;
> > > >        double y = ceil(100 * exp(-(x-mu)*(x-mu)/2));
> > > >        f->add_point(x, y, sqrt(y));
> > > >    
> > > >    }
> > > >    f->execute("Y = randnormal(y, s)");
> > > >    f->execute("guess %gauss = Gaussian");
> > > >    f->execute("fit");
> > > >    cout << "peak center: " <<
> > > >    f->calculate_expr("%gauss.Center") <<
> > > >    endl;
> > > >    delete f;
> > > >    return 0;
> > > > 
> > > > }
> > > > 
> > > > output:
> > > > 
> > > > Fityk 0.9.8
> > > > ln(2) = 0.693147
> > > > peak center: 12.3485
> > > > 
> > > > So ithink an implematation of GSL (or similar, maybe gnuplot))
> > > > would be great - but i'm not able to do it without help.
> > > > 
> > > > On Monday, January 23, 2012 03:06:29 Randall Morgan wrote:
> > > > > You must be familiar with C at some level? I'd be surprised
> > > > > if the
> > > > > GSL
> > > > > doesn't already have a C wrapper somewhere. I haven't used
> > > > > it in
> > > > > many
> > > > 
> > > > years
> > > > 
> > > > > so I can't recall, and I am sure it has changed. It sounds
> > > > > like
> > > > > you've
> > > > > already got a start. So you just need to invest more time
> > > > > into
> > > > > porting
> > > > 
> > > > GSL
> > > > 
> > > > > to Gambas.
> > > > > 
> > > > > On Mon, Jan 23, 2012 at 2:59 AM, Wally <wally at ...2037...> wrote:
> > > > > > On Monday, January 23, 2012 11:47:47 Benoît Minisini wrote:
> > > > > > > Le 22/01/2012 09:54, Wally a écrit :
> > > > > > > > Does anyone have experience with curve fitting
> > > > > > > > and/or
> > > > > > > > peakfinding
> > > > > > > > using gambas ?    (e.g. example code)
> > > > > > > > 
> > > > > > > > Is there a plain C library (Linux) known,
> > > > > > > > suitable to
> > > > > > > > this
> > > > > > > > problem
> > > > > > > > and gambas ?
> > > > > > > > 
> > > > > > > > Something like "fityk" (which is written in C++)
> > > > > > > > but
> > > > > > > > written in
> > > > > > > > plain C to use with "EXTERN"
> > > > > > > > 
> > > > > > > > I might wrap the fityk C++ or try Gnu Scientific
> > > > > > > > Library, but
> > > > > > > > i'm still searching for alternatives.
> > > > > > > > 
> > > > > > > > wally
> > > > > > > 
> > > > > > > There is a GSLSpline example provided with Gambas.
> > > > > > > Does it
> > > > > > > help?
> > > > > > 
> > > > > > I did this example :)
> > 
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