IMP  2.0.0
The Integrative Modeling Platform
score_functor/Harmonic.h
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1 /**
2  * \file IMP/score_functor/Harmonic.h
3  * \brief A Score on the distance between a pair of particles.
4  *
5  * Copyright 2007-2013 IMP Inventors. All rights reserved.
6  */
7 
8 #ifndef IMPSCORE_FUNCTOR_HARMONIC_H
9 #define IMPSCORE_FUNCTOR_HARMONIC_H
10 
11 #include <IMP/score_functor/score_functor_config.h>
12 #include "Score.h"
13 #include <IMP/algebra/utility.h>
14 IMPSCOREFUNCTOR_BEGIN_NAMESPACE
15 
16 
17 /** A DistanceScore that scores with a harmonic on the distance, centered
18  at 0.*/
19 class Harmonic: public Score {
20  double k_;
21 public:
22  Harmonic(double k): k_(k){}
23  template <unsigned int D>
24  double get_score(Model *, const base::Array<D, ParticleIndex>&,
25  double distance) const {
26  return .5*k_*algebra::get_squared(distance);
27  }
28  template <unsigned int D>
29  DerivativePair get_score_and_derivative(Model *m,
31  double distance) const {
32  return DerivativePair(get_score(m,p,distance),
33  k_*(distance));
34  }
35 };
36 
37 IMPSCOREFUNCTOR_END_NAMESPACE
38 
39 #endif /* IMPSCORE_FUNCTOR_HARMONIC_H */