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src
CumulativeChiSquare.cc
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// -*- C++ -*-
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// $Id: CumulativeChiSquare.cc,v 1.3 2003/09/06 14:04:14 boudreau Exp $
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// ---------------------------------------------------------------------------
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#include "
CLHEP/GenericFunctions/CumulativeChiSquare.hh
"
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#include "
CLHEP/GenericFunctions/IncompleteGamma.hh
"
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#include "
CLHEP/GenericFunctions/Variable.hh
"
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namespace
Genfun {
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FUNCTION_OBJECT_IMP
(CumulativeChiSquare)
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//---------------------------------------------------------------------------------//
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// Implementation notes: The Cumulative Chi Square function is implemented in //
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// terms of the incomplete gamma function. //
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//---------------------------------------------------------------------------------//
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CumulativeChiSquare
::
CumulativeChiSquare
(
unsigned
int
ndf):
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_nDof(ndf)
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{
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create();
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}
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CumulativeChiSquare::~CumulativeChiSquare
() {
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delete
_function;
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}
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CumulativeChiSquare::CumulativeChiSquare
(
const
CumulativeChiSquare
& right):
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AbsFunction
(right),
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_nDof(right._nDof)
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{
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create();
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}
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double
CumulativeChiSquare::operator()
(
double
x)
const
{
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return
(*_function)(x);
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}
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unsigned
int
CumulativeChiSquare::nDof
()
const
{
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return
_nDof;
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}
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void
CumulativeChiSquare::create() {
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Variable
x;
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IncompleteGamma
incompleteGamma;
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incompleteGamma.
a
().
setValue
(_nDof/2.0);
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_function = (incompleteGamma(x/2.0)).
clone
();
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}
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}
// namespace Genfun
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