iaf_propagator.h

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/*
 *  iaf_propagator.h
 *
 *  This file is part of NEST.
 *
 *  Copyright (C) 2004 The NEST Initiative
 *
 *  NEST is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  NEST is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with NEST.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef IAF_PROPAGATOR_H
#define IAF_PROPAGATOR_H
 
// C++ includes:
#include <cmath>
#include <tuple>
 
// Includes from libnestutil:
#include "numerics.h"
 
 
class IAFPropagator
{
public:
  IAFPropagator();
 
  IAFPropagator( double tau_syn, double tau_m, double c_m );
 
protected:
  static constexpr double NUMERICAL_STABILITY_FACTOR_ = 1e-7;
 
  std::tuple< double, double, double, double > evaluate_P32_( double h ) const;
 
  double tau_syn_;  
  double tau_m_;    
  double c_m_;      
 
  double h_min_regular_;  
 
  double beta_;   
  double gamma_;  
 
  double inv_tau_syn_;  
  double inv_tau_m_;    
  double inv_c_m_;      
  double inv_beta_;     
};
 
 
class IAFPropagatorExp : public IAFPropagator
{
public:
  IAFPropagatorExp();
 
  IAFPropagatorExp( double tau_syn, double tau_m, double c_m );
 
  double evaluate( double h ) const;
};
 
class IAFPropagatorAlpha : public IAFPropagator
{
public:
  IAFPropagatorAlpha();
 
  IAFPropagatorAlpha( double tau_syn, double tau_m, double c_m );
 
  std::tuple< double, double > evaluate( double h ) const;
};
 
 
inline double
IAFPropagatorExp::evaluate( double h ) const
{
  double P32;
  std::tie( P32, std::ignore, std::ignore, std::ignore ) = evaluate_P32_( h );
 
  return P32;
}
 
#endif