void free_matrix_double ( double **a );
void free_matrix_float ( float **a );
void free_vector_double ( double *v );
void free_vector_float ( float *v );
double **make_matrix_double ( int m, int n );
float **make_matrix_float ( int m, int n );
double *make_vector_double ( int n );
float *make_vector_float ( int n );
void timestamp ( );