1PSI(3)                User Contributed Perl Documentation               PSI(3)
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NAME

6       PDL::GSLSF::PSI - PDL interface to GSL Special Functions
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DESCRIPTION

9       This is an interface to the Special Function package present in the GNU
10       Scientific Library.
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12       Poly-Gamma Functions
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14       psi(m,x) := (d/dx)^m psi(0,x) = (d/dx)^{m+1} log(gamma(x))
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SYNOPSIS

Functions

FUNCTIONS

19       gsl_sf_psi
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21         Signature: (double x(); double [o]y(); double [o]e())
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23       Di-Gamma Function psi(x).
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25       gsl_sf_psi_1piy
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27         Signature: (double x(); double [o]y(); double [o]e())
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29       Di-Gamma Function Re[psi(1 + I y)]
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31       gsl_sf_psi_n
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33         Signature: (double x(); double [o]y(); double [o]e(); int n)
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35       Poly-Gamma Function psi^(n)(x)
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AUTHOR

38       This file copyright (C) 1999 Christian Pellegrin <chri@infis.univ.tri‐
39       este.it> All rights reserved. There is no warranty. You are allowed to
40       redistribute this software / documentation under certain conditions.
41       For details, see the file COPYING in the PDL distribution. If this file
42       is separated from the PDL distribution, the copyright notice should be
43       included in the file.
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45       The GSL SF modules were written by G. Jungman.
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49perl v5.8.8                       2006-12-02                            PSI(3)