void design_matrix_set_case_count (struct design_matrix *, const struct variable *, size_t);
-void design_matrix_get_case_count (struct design_matrix *, const struct variable *);
+size_t design_matrix_get_case_count (const struct design_matrix *, const struct variable *);
+size_t design_matrix_get_n_cols (const struct design_matrix *);
+size_t design_matrix_get_n_rows (const struct design_matrix *);
#endif