man PDL::GSLSF::PSI () - PDL interface to GSL Special Functions
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.