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).

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