xbt_matrix_copy_values(C, result.C, submatrix_size, submatrix_size,
submatrix_size * result.linepos,
submatrix_size * result.rowpos, 0, 0, NULL);
xbt_matrix_copy_values(C, result.C, submatrix_size, submatrix_size,
submatrix_size * result.linepos,
submatrix_size * result.rowpos, 0, 0, NULL);