0

this is a small example from the gsl example online

I need to get the value from the "&evec_i.vector " into a 4x4 dimensional array

such that

abc[4][4]= vector elements

how can I do this ? those 16 values will create the 4x4 matrix

```
#include <stdio.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_eigen.h>
int main (void)
{
double data[] = { 1.0 , 1/2.0, 1/3.0, 1/4.0,
1/2.0, 1/3.0, 1/4.0, 1/5.0,
1/3.0, 1/4.0, 1/5.0, 1/6.0,
1/4.0, 1/5.0, 1/6.0, 1/7.0 };
gsl_matrix_view m = gsl_matrix_view_array(data, 4, 4);
gsl_vector *eval = gsl_vector_alloc (4);
gsl_matrix *evec = gsl_matrix_alloc (4, 4);
gsl_eigen_symmv_workspace * w = gsl_eigen_symmv_alloc (4);
gsl_eigen_symmv (&m.matrix, eval, evec, w);
gsl_eigen_symmv_free(w);
gsl_eigen_symmv_sort (eval, evec, GSL_EIGEN_SORT_ABS_ASC);
{
int i;
for (i = 0; i < 4; i++)
{
double eval_i = gsl_vector_get(eval, i);
gsl_vector_view evec_i = gsl_matrix_column(evec, i);
printf("eigenvalue = %g\n", eval_i);
printf("eigenvector = \n");
gsl_vector_fprintf(stdout, &evec_i.vector, "%g");
}
}
return 0;
}
```