gsl

[Ranjan Maitra]

I am late to this thread and confused: isn't there an example in the manual?

https://www.gnu.org/software/gsl/manual/html_node/Example-programs-for-Nonlinear-Least_002dSquares-Fitting.html#Example-programs-for-Nonlinear-Least_002dSquares-Fitting

Does this above work?

Ranjan


On Thu, 4 Jun 2015 09:53:59 -0400 Fred Smith <fredex at fcshome.stoneham.ma.us> wrote:

> On Thu, Jun 04, 2015 at 03:30:18PM +0200, Patrick Dupre wrote:
> > 
> >     const gsl_multifit_fsolver_type T_ ;
> >     gsl_multifit_fsolver *s_ = gsl_multifit_fsolver_alloc (&T_, 10, 5);
> > 
> > 
> > Gives the same
> >  Segmentation fault (core dumped)
> 
> I installed gsl and gsl-devel, but didn't find any man pages, so I cannot
> tell what it says (or would say) about how to call that function. As a
> result, I had to guess.
> 
> perhps it wants you to locally allocate an actual structure instance
> (not merely a pointer) and pass its address?
> 
> in that case, remove thne * from the declaration and add the & to the call.
> 
> Fred
> > 
> > ===========================================================================
> >  Patrick DUPRÉ                                 | | email: pdupre at gmx.com
> >  Laboratoire de Physico-Chimie de l'Atmosphère | |
> >  Université du Littoral-Côte d'Opale           | |
> >  Tel.  (33)-(0)3 28 23 76 12                   | | Fax: 03 28 65 82 44
> >  189A, avenue Maurice Schumann                 | | 59140 Dunkerque, France
> > ===========================================================================
> > 
> > 
> > > Sent: Thursday, June 04, 2015 at 3:15 PM
> > > From: "Fred Smith" <fredex at fcshome.stoneham.ma.us>
> > > To: users at lists.fedoraproject.org
> > > Subject: Re: gsl
> > >
> > > On Thu, Jun 04, 2015 at 02:01:41PM +0100, Jonathan Underwood wrote:
> > > > On 3 June 2015 at 22:23, Patrick Dupre <pdupre at gmx.com> wrote:
> > > > > Hello,
> > > > >
> > > > > Can somebody help me?
> > > > >
> > > > > This short piece of code fails.
> > > > > It seems to be due to the gsl library!
> > > > >
> > > > > Thank for your help.
> > > > >
> > > > > #include <gsl/gsl_multifit_nlin.h>
> > > > >
> > > > > int main () {
> > > > >   const gsl_multifit_fsolver_type *T_ ;
> > > > >   gsl_multifit_fsolver *s_ = gsl_multifit_fsolver_alloc (T_, 10, 1);
> > > > >   }
> > > > >
> > > > 
> > > > 
> > > > You haven't initialized T_, so when you call
> > > > gsl_multifit_fsolver_alloc, it fails because it doesn't know what
> > > > solver type to allocate for.
> > > > 
> > > > So, try initializing it, eg.
> > > > 
> > > > const gsl_multifit_fsolver_type *T_ = gsl_multifit_fdfsolver_lmsder;
> > > 
> > > the other thought I had is that you may need to pass the address of 
> > > T_ so the function knows where your local gsl_multifit_fsolver_type
> > > is, so it can store data there. Try passing "&T_" instead. In this case
> > > you wouldn't need to initialize it because the routine will use
> > > the address of your local variable.
> > > 
> > > 
> > > -- 
> > > ---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
> > >    "For the word of God is living and active. Sharper than any double-edged 
> > >    sword, it penetrates even to dividing soul and spirit, joints and marrow; 
> > >               it judges the thoughts and attitudes of the heart."  
> > > ---------------------------- Hebrews 4:12 (niv) ------------------------------
> > > -- 
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> -- 
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