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ReverseExponential.cc
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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 _decayConstant(right._decayConstant)
16 {
17 }
18 
20 }
21 
22 double ReverseExponential::operator() (double x) const {
23  if (x>0) return 0;
24  return exp(x/_decayConstant.getValue())/_decayConstant.getValue();
25 }
26 
28  return _decayConstant;
29 }
30 
31 
32 Derivative ReverseExponential::partial(unsigned int index) const {
33  assert(index==0);
34  const AbsFunction & fPrime = _decayConstant*(*this);
35  return Derivative(&fPrime);
36 }
37 
38 
39 } // namespace Genfun