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Chris Marshall
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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

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.