[Gambas-user] curve fitting library ?
Wally
wally at ...2037...
Mon Jan 23 19:58:10 CET 2012
Rqandall,
let us listen Marcin first. Maybe he has some interesting informations.
In fityk i found that the favourie mehtod is "chi squares method".
Gsl offers this also :
— Function: double gsl_cdf_chisq_P (double x, double nu)
— Function: double gsl_cdf_chisq_Q (double x, double nu)
— Function: double gsl_cdf_chisq_Pinv (double P, double nu)
— Function: double gsl_cdf_chisq_Qinv (double Q, double nu)
On Monday, January 23, 2012 10:41:55 Randall Morgan wrote:
> Looks to me that as long as any derivative work is lincesed GPL and we
> follow it's terms we should be good to go with the fityk library.
>
> On Mon, Jan 23, 2012 at 10:18 AM, Randall Morgan <rmorgan62 at ...626...>wrote:
> > Wally,
> >
> > I just found this: http://fityk.nieto.pl/intro.html#about
> >
> > If you scroll down you'll find that the fityk library is licensed under
> > the GPL 2 or later. This should allow us to create derivative works.
> >
> > Take a look at the license and I will too.
> >
> > Randall
> >
> > On Mon, Jan 23, 2012 at 10:11 AM, Randall Morgan
<rmorgan62 at ...626...>wrote:
> >> OK thank you.
> >>
> >> On Mon, Jan 23, 2012 at 10:09 AM, Wally <wally at ...2037...> wrote:
> >>> 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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> >>
> >> --
> >> If you ask me if it can be done. The answer is YES, it can always be
> >> done. The correct questions however are... What will it cost, and how
> >> long will it take?
> >
> > --
> > If you ask me if it can be done. The answer is YES, it can always be
> > done. The correct questions however are... What will it cost, and how
> > long will it take?
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