[Gambas-user] curve fitting library ?

Mon Jan 23 19:41:55 CET 2012

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?
>

-- 
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?