CLHEP 2.0.4.7 Reference Documentation
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00001 // -*- C++ -*- 00002 // $Id: ReverseExponential.cc,v 1.4 2003/10/10 17:40:39 garren Exp $ 00003 #include "CLHEP/GenericFunctions/ReverseExponential.hh" 00004 #include <assert.h> 00005 #include <cmath> // for exp() 00006 00007 namespace Genfun { 00008 FUNCTION_OBJECT_IMP(ReverseExponential) 00009 00010 ReverseExponential::ReverseExponential(): 00011 _decayConstant("Decay Constant", 1.0, 0,10) 00012 {} 00013 00014 ReverseExponential::ReverseExponential(const ReverseExponential & right) : 00015 _decayConstant(right._decayConstant) 00016 { 00017 } 00018 00019 ReverseExponential::~ReverseExponential() { 00020 } 00021 00022 double ReverseExponential::operator() (double x) const { 00023 if (x>0) return 0; 00024 return exp(x/_decayConstant.getValue())/_decayConstant.getValue(); 00025 } 00026 00027 Parameter & ReverseExponential::decayConstant() { 00028 return _decayConstant; 00029 } 00030 00031 00032 Derivative ReverseExponential::partial(unsigned int index) const { 00033 assert(index==0); 00034 const AbsFunction & fPrime = _decayConstant*(*this); 00035 return Derivative(&fPrime); 00036 } 00037 00038 00039 } // namespace Genfun