#include <stdio.h>

#include <gsl/gsl_blas.h>

int

main (void)

{

  double a[] = { 0.11, 0.12, 0.13,

                 0.21, 0.22, 0.23 };

  double b[] = { 1011, 1012,

                 1021, 1022,

                 1031, 1032 };

  double c[] = { 0.00, 0.00,

                 0.00, 0.00 };

  gsl_matrix_view A = gsl_matrix_view_array(a, 2, 3);

  gsl_matrix_view B = gsl_matrix_view_array(b, 3, 2);

  gsl_matrix_view C = gsl_matrix_view_array(c, 2, 2);

  /* Compute C = A B */

  gsl_blas_dgemm (CblasNoTrans, CblasNoTrans,

                  1.0, &A.matrix, &B.matrix,

                  0.0, &C.matrix);

  printf ("[ %g, %g\n", c[0], c[1]);

  printf ("  %g, %g ]\n", c[2], c[3]);

  return 0;  

}