Hi,
Thanks, that worked :). Just had to review a bit of Pointers & structures
from textbook to understand what was goin on.
AR
On 2/19/06, Analabha Roy <[EMAIL PROTECTED]> wrote:
>
> Thanks, I'll give it a whirl.
>
> ---------- Forwarded message ----------
> From: Joakim Hove <[EMAIL PROTECTED]>
> Date: Feb 19, 2006 3:46 PM
> Subject: Re: [Help-gsl] passing multiple parameters to func() & jac()
> while integrating ODE's in gsl
> To: Analabha Roy <[EMAIL PROTECTED]>
>
> "Analabha Roy" < [EMAIL PROTECTED]> writes:
>
> > I assumed that, in order to do it for multiple parameters, I'd have
> > to put the parameters in an array and pass the base address to the
> > gsl_odeiv_system datatype, then use pointer arithmetic in the
>
>
> 1. I would strongly recommend defining a struct to contain your set of
> parameters; that is considerably less error prone than an array:
>
> typedef struct {
> double mass;
> double w;
> } harmonic_type;
>
>
>
>
> int func(double t, const double y[], double dydt[], void *params) {
> harmonic_type *p = (harmonic_type *) params;
> double mass = p->mass;
> double w = w->w;
> ...
> ....
>
> double mass,w;
>
> mass=*(double *)params;
>
> 2. I guess this pointer arithimitc comes out wrong, becuse params is
> *not* of type double.
>
> params++;
>
> Anyway, you do not have to worry about that when using a struct.
>
> HTH - Joakim
>
> --
> Joakim Hove
> hove AT ntnu.no /
> Tlf: +47 (55 5)8 27 13 / Stabburveien 18
> Fax: +47 (55 5)8 94 40 / N-5231 Paradis
> http://www.ift.uib.no/~hove/ <http://www.ift.uib.no/%7Ehove/> /
> 55 91 28 18 / 92 68 57 04
>
>
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