Re: gsl_complex_rect undefined?

[Tisserand Patrice <Patrice.Tisserand@ircam.fr>]

Abraham David Smith wrote:

> I am trying to use GSL 1.0 on an ix86 running an essentially normal RedHat
> Linux 7.1 installation (with all of RedHat's published patches applied
> to gcc, etc).
>
> Consider the following code snippet:
>
> #include <iostream.h>

/*
    Humm: It's out of topic but it's better to use:
    #include <iostream> instead of #include <iostream.h> old version of include
file
    and add:
    using namespace std;
*/

>
> #include <gsl/gsl_complex.h>

#include <gsl/gsl_complex_math.h> /* See comments lower */

>
> void main()
>   {
>   gsl_complex a = gsl_complex_rect(1.0,2.0);
>   cout << GSL_REAL(a) << ", " << GSL_IMAG(a) << endl;
>   GSL_SET_COMPLEX (&a, 3.0, 4.0);
>   cout << GSL_REAL(a) << ", " << GSL_IMAG(a) << endl;
>   }
>
> Compiling this with g++ gives:
>
> testcomplex.cpp: In function `int main (...)':
> testcomplex.cpp:9: `gsl_complex_rect' undeclared (first use this
> function)
> testcomplex.cpp:9: (Each undeclared identifier is reported only once
> for each function it appears in.)
>
> now consider the snippet:
>
> #include <iostream.h>
> #include <gsl/gsl_complex.h>
> void main()
>   {
>   gsl_complex a;
>   cout << GSL_REAL(a) << ", " << GSL_IMAG(a) << endl;
>   GSL_SET_COMPLEX (&a, 3.0, 4.0);
>   cout << GSL_REAL(a) << ", " << GSL_IMAG(a) << endl;
>   }
>
> this compiles and gives:
> 2.10391, 7.02217
> 3, 4
>
> According to page 18 of the GSL manual
> [ http://sources.redhat.com/gsl/ref/gsl-ref_5.html#SEC34 ], the function
> gsl_complex_rect should be defined.  What's up here?
>

According to the same page of the GSL Manual:
The complex types are defined in the header file `gsl_complex.h', while the
corresponding complex functions and arithmetic operations are defined in
`gsl_complex_math.h'.
I made the same mistake some time ago and I take some time to understand why it
doesn't work.

Thanks to be open source

Patrice


>
> --
> # Abraham David Smith       UW--Madison Mathematics/Physics Undergraduate [*] #
> # <abrahamsmith@students.wisc.edu>  Y!:abrahamdavidsmith  AOL-IM:abrahamsmith #
> # http://euclid.dsl.wisc.edu/~abe     Molon Labe!       Defend your rights!   #
> # [*]: The views I express are not necessarily those of the UW--Madison, etc. #