CLHEP VERSION Reference Documentation
   
CLHEP Home Page     CLHEP Documentation     CLHEP Bug Reports

ReverseExponential.cc
Go to the documentation of this file.
1 // -*- C++ -*-
2 // $Id: ReverseExponential.cc,v 1.4 2003/10/10 17:40:39 garren Exp $
4 #include <assert.h>
5 #include <cmath> // for exp()
6 
7 namespace Genfun {
8 FUNCTION_OBJECT_IMP(ReverseExponential)
9 
11  _decayConstant("Decay Constant", 1.0, 0,10)
12 {}
13 
15 AbsFunction(right),
16 _decayConstant(right._decayConstant)
17 {
18 }
19 
21 }
22 
23 double ReverseExponential::operator() (double x) const {
24  if (x>0) return 0;
25  return exp(x/_decayConstant.getValue())/_decayConstant.getValue();
26 }
27 
29  return _decayConstant;
30 }
31 
32 
33 Derivative ReverseExponential::partial(unsigned int index) const {
34  assert(index==0);
35  const AbsFunction & fPrime = _decayConstant*(*this);
36  return Derivative(&fPrime);
37 }
38 
39 
40 } // namespace Genfun