Function trigamma

inst/include/Rcpp/Rmath.h:195–195

    inline double psigamma(double x, double deriv)	{ return ::Rf_psigamma(x, deriv); }
    inline double digamma(double x)	{ return ::Rf_digamma(x); }
    inline double trigamma(double x)	{ return ::Rf_trigamma(x); }
    inline double tetragamma(double x)	{ return ::Rf_tetragamma(x); }
    inline double pentagamma(double x)	{ return ::Rf_pentagamma(x); }