GModelSpectralNodes.hpp
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/***************************************************************************
* GModelSpectralNodes.hpp - Spectral nodes model class *
* ----------------------------------------------------------------------- *
* copyright (C) 2012 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* This program 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 3 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file GModelSpectralNodes.hpp
* @brief Spectral nodes model class definition
* @author J. Knoedlseder
*/
#ifndef GMODELSPECTRALNODES_HPP
#define GMODELSPECTRALNODES_HPP
/* __ Includes ___________________________________________________________ */
#include <vector>
#include <string>
#include "GModelPar.hpp"
#include "GModelSpectral.hpp"
#include "GEnergy.hpp"
#include "GXmlElement.hpp"
#include "GNodeArray.hpp"
/***********************************************************************//**
* @class GModelSpectralNodes
*
* @brief Spectral nodes model class
*
* This class implements a piecewise power law between spectral nodes
* \f$(E_i, I_i)\f$,
* where
* \f$E_i\f$ is the energy and \f$I_i\f$ is the intensity of node \f$i\f$.
* For a given energy \f$E\f$, the piecewise powerlaw is computing by
* finding the bracketing energies \f$E_1 <= E <= E_2\f$ and computing
* \f[I(E)=10^{(\log v_1 + \log s_1) w_1 + (\log v_2 + \log s_2) w_2}\f]
* where
* \f$I_1 = v_1 s_1\f$ is the intensity of node 1 (\f$E_1\f$),
* \f$I_2 = v_2 s_2\f$ is the intensity of node 2 (\f$E_2\f$),
* \f$w_1\f$ is the weighting of node 1, and
* \f$w_2\f$ is the weighting of node 2.
* The weightings \f$w_1\f$ and \f$w_2\f$ are computed by linear
* interpolation (in the log-log plane) between the nodes
* \f$(\log E_1, \log I_1)\f$
* and
* \f$(\log E_2, \log I_2)\f$
* to the requested energy \f$\log E\f$.
***************************************************************************/
class GModelSpectralNodes : public GModelSpectral {
public:
// Constructors and destructors
GModelSpectralNodes(void);
explicit GModelSpectralNodes(const GXmlElement& xml);
GModelSpectralNodes(const GModelSpectralNodes& model);
virtual ~GModelSpectralNodes(void);
// Operators
virtual GModelSpectralNodes& operator=(const GModelSpectralNodes& model);
// Implemented pure virtual methods
virtual void clear(void);
virtual GModelSpectralNodes* clone(void) const;
virtual std::string type(void) const { return "NodeFunction"; }
virtual double eval(const GEnergy& srcEng) const;
virtual double eval_gradients(const GEnergy& srcEng) const;
virtual double flux(const GEnergy& emin, const GEnergy& emax) const;
virtual double eflux(const GEnergy& emin, const GEnergy& emax) const;
virtual GEnergy mc(const GEnergy& emin, const GEnergy& emax, GRan& ran) const;
virtual void read(const GXmlElement& xml);
virtual void write(GXmlElement& xml) const;
virtual std::string print(void) const;
protected:
// Protected methods
void init_members(void);
void copy_members(const GModelSpectralNodes& model);
void free_members(void);
void update_pars(void);
void load_nodes(const std::string& filename);
void set_cache(void) const;
void set_eval_cache(void) const;
void set_flux_cache(void) const;
void update_eval_cache(void) const;
void update_flux_cache(void) const;
void mc_update(const GEnergy& emin, const GEnergy& emax) const;
// Protected members
std::vector<GModelPar> m_energies; //!< Node energies
std::vector<GModelPar> m_values; //!< Node values
// Evaluation cache
mutable std::vector<double> m_old_energies; //!< Old energies
mutable std::vector<double> m_old_values; //!< Old values
mutable GNodeArray m_log_energies; //!< log10(energy) of nodes
mutable std::vector<double> m_log_values; //!< log10(value) of nodes
// Flux computation cache
mutable GNodeArray m_lin_energies; //!< Energy of nodes
mutable std::vector<double> m_lin_values; //!< Values of nodes
mutable std::vector<double> m_prefactor; //!< Power-law normalisations
mutable std::vector<double> m_gamma; //!< Power-law indices
mutable std::vector<double> m_epivot; //!< Power-law pivot energies
mutable std::vector<double> m_flux; //!< Photon fluxes
mutable std::vector<double> m_eflux; //!< Energy fluxes
// Cached members for MC
mutable GEnergy m_mc_emin; //!< Minimum energy
mutable GEnergy m_mc_emax; //!< Maximum energy
mutable std::vector<double> m_mc_cum; //!< Cumulative distribution
mutable std::vector<double> m_mc_min; //!< Lower boundary for MC
mutable std::vector<double> m_mc_max; //!< Upper boundary for MC
mutable std::vector<double> m_mc_exp; //!< Exponent for MC
};
#endif /* GMODELSPECTRALNODES_HPP */