PSI(3) User Contributed Perl Documentation PSI(3)NAMEPDL::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))
SYNOPSISFUNCTIONS
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 v5.18.1 2014-01-17 PSI(3)