redhat man page for pdl::gslsf::psi

PSI(3)							User Contributed Perl Documentation						    PSI(3)

NAME
       PDL::GSLSF::PSI - PDL interface to GSL Special Functions

DESCRIPTION
       This is an interface to the Special Function package present in the GNU Scientific Library.

       Poly-Gamma Functions

       psi(m,x) := (d/dx)^m psi(0,x) = (d/dx)^{m+1} log(gamma(x))

SYNOPSIS
Functions
FUNCTIONS
       gsl_sf_psi

	 Signature: (double x(); double [o]y(); double [o]e())

       Di-Gamma Function psi(x).

       gsl_sf_psi_1piy

	 Signature: (double x(); double [o]y(); double [o]e())

       Di-Gamma Function Re[psi(1 + I y)]

       gsl_sf_psi_n

	 Signature: (double x(); double [o]y(); double [o]e(); int n)

       Poly-Gamma Function psi^(n)(x)

AUTHOR
       This file copyright (C) 1999 Christian Pellegrin <chri@infis.univ.trieste.it> All rights reserved. There is no warranty. You are allowed to
       redistribute this software / documentation under certain conditions. For details, see the file COPYING in the PDL distribution. If this
       file is separated from the PDL distribution, the copyright notice should be included in the file.

       The GSL SF modules were written by G. Jungman.

perl v5.8.0							    2003-01-29								    PSI(3)