Re: gsl_complex_rect undefined?

[Fleur Kelpin <fleur@bio.vu.nl>]

Hi,

You need the include file gsl_complex_math.h
In case of similar trouble, grep the include files:
(in the /usr/local/include or similar:)
>cd gsl/complex
>grep gsl_complex_rect *.h
gsl_complex_math.h:gsl_complex gsl_complex_rect (double x, double y);  /*
r= real+i*imag */
gsl_complex_math.h:gsl_complex_rect (double x, double y)
gsl_complex_math.h:#define GSL_COMPLEX_ONE (gsl_complex_rect(1.0,0.0))
gsl_complex_math.h:#define GSL_COMPLEX_ZERO (gsl_complex_rect(0.0,0.0))
gsl_complex_math.h:#define GSL_COMPLEX_NEGONE (gsl_complex_rect(-1.0,0.0))

Greetings,
Fleur Kelpin

On Tue, 18 Dec 2001, 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>
> #include <gsl/gsl_complex.h>
> 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?
>
>
> --
> # 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. #
>