[Help-gsl] Gsl ODE sample program compiling erro.

[Ming Lu]

Dear All:
I am trying to compiling a sample program from gsl official website.
Here is the program LINK
<https://www.gnu.org/software/gsl/manual/html_node/ODE-Example-programs.html#ODE-Example-programs>,
I will also paste it below:
****************************************************************************************************
#include <stdio.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_odeiv2.h>

int func (double t, const double y[], double f[], void *params)
{
  double mu = *(double *)params;  //purpose?
  f[0] = y[1];
  f[1] = -y[0] - mu*y[1]*(y[0]*y[0] - 1);
  return GSL_SUCCESS;
}

int jac (double t, const double y[], double *dfdy, double dfdt[], void
*params)
{
  double mu = *(double *)params;
  gsl_matrix_view dfdy_mat  = gsl_matrix_view_array (dfdy, 2, 2);
  gsl_matrix * m = &dfdy_mat.matrix;
  gsl_matrix_set (m, 0, 0, 0.0);
  gsl_matrix_set (m, 0, 1, 1.0);
  gsl_matrix_set (m, 1, 0, -2.0*mu*y[0]*y[1] - 1.0);
  gsl_matrix_set (m, 1, 1, -mu*(y[0]*y[0] - 1.0));
  dfdt[0] = 0.0;
  dfdt[1] = 0.0;
  return GSL_SUCCESS;
}
int main (void)
{
  double mu = 10;
  gsl_odeiv2_system sys = {func, jac, 2, &mu};

  gsl_odeiv2_driver * d = gsl_odeiv2_driver_alloc_y_new (&sys,
gsl_odeiv2_step_rk8pd,1e-6, 1e-6, 0.0);
  int i;
  double t = 0.0, t1 = 100.0;
  double y[2] = { 1.0, 0.0 };

  for (i = 1; i <= 100; i++)
    {
      double ti = i * t1 / 100.0;
      int status = gsl_odeiv2_driver_apply (d, &t, ti, y);

      if (status != GSL_SUCCESS)
  {
    printf ("error, return value=%d\n", status);
    break;
  }

      printf ("%.5e %.5e %.5e\n", t, y[0], y[1]);
    }

  gsl_odeiv2_driver_free (d);
  return 0;
}
**************************************************************************************************
I have installed gsl in the default place. When I tried to compile it use *gcc
-Wall example.c -c* , I have no
error shown. However when I use* gcc example.o* I got the errors:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
ode_exp.o: In function `jac':
ode_exp.c:(.text+0xd1): undefined reference to `gsl_matrix_view_array'
ode_exp.c:(.text+0xf3): undefined reference to `gsl_matrix_set'
ode_exp.c:(.text+0x111): undefined reference to `gsl_matrix_set'
ode_exp.c:(.text+0x160): undefined reference to `gsl_matrix_set'
ode_exp.c:(.text+0x1ab): undefined reference to `gsl_matrix_set'
ode_exp.o: In function `main':
ode_exp.c:(.text+0x20b): undefined reference to `gsl_odeiv2_step_rk8pd'
ode_exp.c:(.text+0x22e): undefined reference to
`gsl_odeiv2_driver_alloc_y_new'
ode_exp.c:(.text+0x2a0): undefined reference to `gsl_odeiv2_driver_apply'
ode_exp.c:(.text+0x2fd): undefined reference to `gsl_odeiv2_driver_free'
collect2: ld returned 1 exit status
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Then I search the website and found actually someone have asked in this
maillist before about the
exactly the same problem. HERE IS THE LINK
<http://lists.gnu.org/archive/html/help-gsl/2012-05/msg00000.html> to that
question. I've tried the suggestion given by
the repliers.

That is: when I use: *gcc -o example exmaple.c -lgsl -lgslcblas -lm*

I got the error message:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
/tmp/ccCF5OM2.o: In function `main':
ode_exp.c:(.text+0x20b): undefined reference to `gsl_odeiv2_step_rk8pd'
ode_exp.c:(.text+0x22e): undefined reference to
`gsl_odeiv2_driver_alloc_y_new'
ode_exp.c:(.text+0x2a0): undefined reference to `gsl_odeiv2_driver_apply'
ode_exp.c:(.text+0x2fd): undefined reference to `gsl_odeiv2_driver_free'
collect2: ld returned 1 exit status
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Can someone help me? If you need more information, please let me know.
-- 
Regards,
   Ming Lu

----
Ming Lu, graduate student of  second year,
ICQM, Peking University <http://icqm.pku.edu.cn>