Gsl

[davoudi]

Hi everybody,

So I recently installed gsl library using sudo apt-get install libgsl0-dev.

I use a simple example

#include <stdio.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>

int
main (void)
{
const gsl_rng_type * T;
gsl_rng * r;

int i, n = 10;
double mu = 3.0;

/* create a generator chosen by the
environment variable GSL_RNG_TYPE */

gsl_rng_env_setup();

T = gsl_rng_default;
r = gsl_rng_alloc (T);

/* print n random variates chosen from
the poisson distribution with mean
parameter mu */

for (i = 0; i < n; i++)
{
unsigned int k = gsl_ran_poisson (r, mu);
printf (" %u", k);
}

printf ("\n");
gsl_rng_free (r);
return 0;
}

and using g++ -o exe_file -lgsl file.cpp
but I get the following errors

A.cpp.text+0x1e): undefined reference to `gsl_rng_env_setup'
A.cpp.text+0x25): undefined reference to `gsl_rng_default'
A.cpp.text+0x35): undefined reference to `gsl_rng_alloc'
A.cpp.text+0x53): undefined reference to `gsl_ran_poisson'
A.cpp.text+0x91): undefined reference to `gsl_rng_free'

Any help is appreciated.

[davoudi]

By the way I am using Ubuntu 11.10.

[196sigma]

Having the same issue on 11.10. Any help would be much appreciated.

[196sigma]

Actually just found the solution.
Basically, you have to put the compiler flags in the correct order. That is, after the compile statement:

$ gcc temp.c -o temp -lgsl -lgslcblas

Background:
<a href="http://askubuntu.com/questions/71623/why-does-gsl-library-not-compile-link-in-11-10-despite-that-it-did-under-11-04">http://askubuntu.com/questions/71623/why-does-gsl-library-not-compile-link-in-11-10-despite-that-it-did-under-11-04</a>

and
<a href="http://ubuntuforums.org/archive/index.php/t-1833136.html">http://ubuntuforums.org/archive/index.php/t-1833136.html</a>

HTH