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 does not process bad values.	It will set the bad-value flag of all output piddles if the flag is set for any of the input
       piddles.

   gsl_sf_psi_1piy
	 Signature: (double x(); double [o]y(); double [o]e())

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

       gsl_sf_psi_1piy does not process bad values.  It will set the bad-value flag of all output piddles if the flag is set for any of the input
       piddles.

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

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

       gsl_sf_psi_n does not process bad values.  It will set the bad-value flag of all output piddles if the flag is set for any of the input
       piddles.

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 v5.12.1							    2010-07-05								    PSI(3)