int gsl_sf_psi_int_e(int n,double* result);
double gsl_sf_psi_int(int n);
int gsl_sf_psi_e(double x,double* result);
double gsl_sf_psi(double x);
int gsl_sf_psi_1piy_e(double y,double* result);
double gsl_sf_psi_1piy(double y);
int gsl_sf_psi_1_int_e(int n,double* result);
double gsl_sf_psi_1_int(int n);
int gsl_sf_psi_1_e(double x,double* result);
double gsl_sf_psi_1(double x);
int gsl_sf_psi_n_e(int n,double x,double* result);
double gsl_sf_psi_n(int n,double x);