[Gambas-user] Gambas3 and Gnu scientific library
wally
wally at ...2037...
Fri May 20 12:57:37 CEST 2011
Of course i want to try some other functionality of GSL too.
and of course I'm too stupid :)
now 1st derivative
the code contains also the working C original and the necessary header files
containing the necessary definitions.
error message is : FMain class line 50
"VarPtr() argument must be a dynamic, a static or a local variable"
wally
On Wednesday, May 18, 2011 18:07:56 Jussi Lahtinen wrote:
> Seems to work (Gambas 3 rev 3850 @ Ubuntu 10.10 64bit), though, I haven't
> check if the results are correct.
> I'm out of time.
>
> Source attached.
>
> BTW. Why 'Library "libgsl"' doesn't find *any* library? However 'Library
> "libgsl:0"' does!
>
> Jussi
>
> On Wed, May 18, 2011 at 18:53, wally <wally at ...2037...> wrote:
> > Yes, few surprises in direction science are highly appreciated :)
> >
> > I have compile problems with the new "extern"
> > At revision 3850. OpenSuse 11.3
> >
> >
> > gambas3_svn/trunk/main/gbx/gbx_c_application.c:401: undefined reference
> > to `EXTERN_get_symbol'
> > collect2: ld returned 1 exit status
> >
> > wally
> >
> > On Wednesday, May 18, 2011 17:33:31 Jussi Lahtinen wrote:
> > > Benoit keeps on amazing us!
> > >
> > > Jussi
> > > P.S. I haven't test it yet...
> > >
> > > On Wed, May 18, 2011 at 18:21, wally <wally at ...2037...> wrote:
> > > > Thanks a lot ! :)
> > > > wally
> > > >
> > > > On Wednesday, May 18, 2011 17:07:09 Benoît Minisini wrote:
> > > > > > Hello Jussi,
> > > > > >
> > > > > > in C the stuff works pretty nice, so i agree to your suggestion
> > > > > > 2.
> > > > > >
> > > > > > Do all math stuff directly in Gambas is an option i should check.
> > > > > >
> > > > > > I think i mentioned that i use Gambas3 and want to make
> > > > > > interpolations, derivatives and integrals from an integrarray.
> > > > > > The array contains ADC outputs from a CCD linear array sensor
> > > >
> > > > measurment
> > > >
> > > > > > wally
> > > > > >
> > > > > > On Monday, May 16, 2011 17:46:51 Jussi Lahtinen wrote:
> > > > > > > Not very easy task...
> > > > > > > Here is interpolation example in C.
> >
> > http://www.gnu.org/software/gsl/manual/html_node/Interpolation-Example-
> >
> > > > > > > pr og rams.html
> > > > > > >
> > > > > > > As you can see, you need to call several functions to get what
> >
> > you
> >
> > > > > > > want. Declaring those in Gambas is OK, except determining
> > > > > > > interpolation type!
> > > > > > >
> > > > > > > You can find definition of interpolation type from
> >
> > "gsl_interp.h",
> >
> > > > > > > and unfortunately it is not anything simple;
> > > > > > >
> > > > > > > typedef struct {
> > > > > > >
> > > > > > > const char * name;
> > > > > > > unsigned int min_size;
> > > > > > > void * (*alloc) (size_t size);
> > > > > > > int (*init) (void *, const double xa[], const double
> >
> > ya[],
> >
> > > > > > > size_t
> > > > > > >
> > > > > > > size);
> > > > > > >
> > > > > > > int (*eval) (const void *, const double xa[], const
> >
> > double
> >
> > > > > > > ya[],
> > > > > > >
> > > > > > > size_t size, double x, gsl_interp_accel *, double * y);
> > > > > > >
> > > > > > > int (*eval_deriv) (const void *, const double xa[],
> > > > > > > const
> > > >
> > > > double
> > > >
> > > > > > > ya[], size_t size, double x, gsl_interp_accel *, double * y_p);
> > > > > > >
> > > > > > > int (*eval_deriv2) (const void *, const double xa[],
> > > > > > > const
> > > >
> > > > double
> > > >
> > > > > > > ya[], size_t size, double x, gsl_interp_accel *, double *
> > > > > > > y_pp);
> > > > > > >
> > > > > > > int (*eval_integ) (const void *, const double xa[],
> > > > > > > const
> > > >
> > > > double
> > > >
> > > > > > > ya[], size_t size, gsl_interp_accel *, double a, double b,
> > > > > > > double
> >
> > *
> >
> > > > > > > result); void (*free) (void *);
> > > > > > >
> > > > > > > } gsl_interp_type;
> > > > > > >
> > > > > > > GSL_VAR const gsl_interp_type * gsl_interp_cspline; * <-- this
> > > > > > > is
> > > >
> > > > used
> > > >
> > > > > > > in example*
> > > > > > >
> > > > > > >
> > > > > > > Right now I don't know how to implement that reasonably in
> >
> > Gambas.
> >
> > > > > > > There are at least three possibilities to overcome this
> > > > > > > problem:
> > > > > > >
> > > > > > > 1. Hope that Benoit will implement new feature to use external
> > > > > > > structures. 2. Use C to write your own interface between GSL
> > > > > > > and Gambas. Perhaps easiest option.
> > > > > > > 3. Do not use GSL at all, and write what you need purely with
> > > > > > > Gambas.
> > > > > > >
> > > > > > > That's all I can say...
> > > > > > > Also because you didn't specify what you need exactly, nor are
> >
> > you
> >
> > > > > > > using Gambas 2 or 3.
> > > > > > >
> > > > > > > Jussi
> > > > >
> > > > > Hi,
> > > > >
> > > > > I added a System.GetExternSymbol() method in the last revision so
> >
> > that
> >
> > > > you
> > > >
> > > > > can get the address of the interpolation type structure.
> > > > >
> > > > > You have to do something like that:
> > > > > Dim gsl_interp_cspline As Pointer
> > > > >
> > > > > gsl_interp_cspline =
> > > > > Pointer@(System.GetExternSymbol("libgsl",
> > > > >
> > > > > "gsl_interp_cspline"))
> > > > >
> > > > > Maybe the Pointer@() is not needed, I don't know. The symbol can be
> > > > > directly the address of the structure (no Pointer@ needed), or a
> > > > > pointer to the address of the structure.
> > > > >
> > > > > Try and tell me.
> > > > >
> > > > > Regards,
> >
> > -------------------------------------------------------------------------
> >
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> >
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> > --
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> > > Read this article and learn how Intel has extended the reach of its
> > > next-generation tools to help Windows* and Linux* C/C++ and Fortran
> > > developers boost performance applications - including clusters.
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> >
> > -------------------------------------------------------------------------
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> > Read this article and learn how Intel has extended the reach of its
> > next-generation tools to help Windows* and Linux* C/C++ and Fortran
> > developers boost performance applications - including clusters.
> > http://p.sf.net/sfu/intel-dev2devmay
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