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@xxxxxxx
> 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@xxxxxxxxxxxxxxxxxxxxxx>
> > To: users@xxxxxxxxxxxxxxxxxxxxxxx
> > 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@xxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxx -----------------------------
> > "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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