#include <stdio.h>

#include <gsl/gsl_vector.h>

int

main (void)

{

  int i; 

  gsl_vector * v = gsl_vector_alloc (100);

  for (i = 0; i < 100; i++)

    {

      gsl_vector_set (v, i, 1.23 + i);

    }

  {  

     FILE * f = fopen ("test.dat", "w");

     gsl_vector_fprintf (f, v, "%.5g");

     fclose (f);

  }

  gsl_vector_free (v);

  return 0;

}