**See also:**How do I search for a function?

# PDL::GSLSF::EXP

# NAME

PDL::GSLSF::EXP - PDL interface to GSL Special Functions

# DESCRIPTION

This is an interface to the Special Function package present in the GNU Scientific Library.

# SYNOPSIS

# FUNCTIONS

## gsl_sf_exp

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

Exponential

gsl_sf_exp 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_exprel_n

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

N-relative Exponential. exprel_N(x) = N!/x^N (exp(x) - Sum[x^k/k!, {k,0,N-1}]) = 1 + x/(N+1) + x^2/((N+1)(N+2)) + ... = 1F1(1,1+N,x)

gsl_sf_exprel_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.

## gsl_sf_exp_err

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

Exponential of a quantity with given error.

gsl_sf_exp_err 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.