gsl

[Patrick Dupre]

    const gsl_multifit_fsolver_type T_ ;
    gsl_multifit_fsolver *s_ = gsl_multifit_fsolver_alloc (&T_, 10, 5);


Gives the same
 Segmentation fault (core dumped)

===========================================================================
 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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