LogisticFunction.hh

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// -*- C++ -*-
// $Id:
//---------------------Gaussian---------------------------------------------//
//                                                                          //
// Class LogisticFunction                                                   //
// Joe Boudreau, November 2002                                              //
//                                                                          //
//--------------------------------------------------------------------------//
#ifndef LogisticFunction_h
#define LogisticFunction_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
#include "CLHEP/GenericFunctions/Parameter.hh"
#include <vector>
namespace Genfun {
 
  /**
   * @author
   * @ingroup genfun
   */
  class LogisticFunction : public AbsFunction  {
 
    FUNCTION_OBJECT_DEF(LogisticFunction)
 
      public:
 
    // Constructor
    LogisticFunction();
 
    // Copy constructor
    LogisticFunction(const LogisticFunction &right);
  
    // Destructor
    virtual ~LogisticFunction();
  
    // Retreive function value
    virtual double operator ()(double argument) const override;
    virtual double operator ()(const Argument & arg) const override {return operator() (arg[0]); }
  
    // Get the starting value of the LogisticFunction
    Parameter & x0(); 
    const Parameter & x0() const; 
 
    // Get the control parameter of the LogisticFunction
    Parameter & a();
    const Parameter & a() const;
 
  private:
 
    // It is illegal to assign an adjustable constant
    const LogisticFunction & operator=(const LogisticFunction &right);
 
    // Here is the decay constant
    Parameter _x0;
 
    // Here is the sigma
    Parameter _a;
 
    // A vector of values.
    mutable std::vector<double> fx;
    // Some cache:
    mutable double __a, __x0;
 
  };
} // namespace Genfun
 
#endif