D.16.2 rmath miscellaneous functions

Some less frequently used real valued mathematical functions are also accessible by the rmath library interface. The functions with names in this group take a single real operand.

     gammafn         lgammafn        digamma
     trigamma        tetragamma      pentagamma

The ones in this group take a pair of real operands (x,y).

     beta            lbeta           bessel_j       bessel_y

Those remaining take a triple of real operands (x,(y,z)).

     bessel_i        bessel_k

An alternative and better documented selection of Bessel functions is provided by the bes library interface (bes).