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src
GammaDistribution.cc
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// -*- C++ -*-
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// $Id:
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#include "
CLHEP/GenericFunctions/GammaDistribution.hh
"
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#include <assert.h>
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#include <cmath>
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using namespace
std;
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namespace
Genfun {
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FUNCTION_OBJECT_IMP
(GammaDistribution)
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GammaDistribution
::
GammaDistribution
():
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_alpha("
a
", 2.0, 1.0, 100),
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_beta ("beta", 0.0, 0, 100)
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{}
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GammaDistribution::GammaDistribution(
const
GammaDistribution
& right):
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AbsFunction
(right),
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_alpha(right._alpha),
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_beta (right._beta)
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{
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}
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GammaDistribution::~GammaDistribution
() {
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}
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double
GammaDistribution::operator()
(
double
x)
const
{
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return
std::pow(x,_alpha.
getValue
()-1)*
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exp(-x/_beta.
getValue
())/std::pow(_beta.
getValue
(),(_alpha.
getValue
()))/
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exp(_logGamma(_alpha.
getValue
()));
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}
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Parameter
&
GammaDistribution::alpha
() {
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return
_alpha;
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}
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Parameter
&
GammaDistribution::beta
() {
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return
_beta;
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}
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}
// namespace Genfun
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