double annulus_area ( double center[], double r1, double r2 );
double *annulus_sample ( double center[], double r1, double r2, int n, int &seed );
double disk01_monomial_integral ( int e[2] );
double *monomial_value ( int m, int n, int e[], double x[] );
double r8_uniform_01 ( int &seed );
double *r8vec_normal_01_new ( int n, int &seed );
double r8vec_sum ( int n, double a[] );
double *r8vec_uniform_01_new ( int n, int &seed );
void timestamp ( );