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GenericFunctions/IncompleteGamma.hh
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// -*- C++ -*-
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// $Id: IncompleteGamma.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
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//---------------------IncompleteGamma--------------------------------------//
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// //
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// Class IncompleteGamma, the incomplete Gamma function //
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// Joe Boudreau, October 2000 //
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// //
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//--------------------------------------------------------------------------//
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#ifndef IncompleteGamma_h
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#define IncompleteGamma_h 1
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#include "
CLHEP/GenericFunctions/AbsFunction.hh
"
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#include "
CLHEP/GenericFunctions/Parameter.hh
"
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#include "
CLHEP/GenericFunctions/LogGamma.hh
"
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namespace
Genfun {
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class
IncompleteGamma :
public
AbsFunction {
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FUNCTION_OBJECT_DEF
(
IncompleteGamma
)
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public:
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// Constructor
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IncompleteGamma
();
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// Copy constructor
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IncompleteGamma(const IncompleteGamma &right);
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// Destructor
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virtual ~IncompleteGamma();
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// Retreive function value
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virtual
double
operator ()(
double
argument) const;
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virtual
double
operator ()(const
Argument
& arg)
const
{
return
operator()
(arg[0]);}
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// Get the paramter a
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Parameter
&
a
();
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private
:
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// It is illegal to assign an adjustable constant
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const
IncompleteGamma
& operator=(
const
IncompleteGamma
&right);
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// Here is the parameter of the Incomplete Gamma Function
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Parameter
_a;
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// Compute via series representation:
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double
_gamser(
double
a
,
double
x,
double
logGamma)
const
;
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// Compute via continued fraction representation:
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double
_gammcf(
double
a
,
double
x,
double
logGamma)
const
;
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// This function has a LogGamma Function;
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LogGamma
_logGamma;
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static
const
int
ITMAX;
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static
const
double
EPS;
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static
const
double
FPMIN;
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};
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}
// namespace Genfun
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#endif
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