GCTABackgroundPerfTable.hpp
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/***************************************************************************
* GCTABackgroundPerfTable.hpp - CTA performance table background class *
* ----------------------------------------------------------------------- *
* copyright (C) 2014-2018 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 GCTABackgroundPerfTable.hpp
* @brief CTA performance table background class definition
* @author Juergen Knoedlseder
*/
#ifndef GCTABACKGROUNDPERFTABLE_HPP
#define GCTABACKGROUNDPERFTABLE_HPP
/* __ Includes ___________________________________________________________ */
#include <string>
#include "GFilename.hpp"
#include "GEnergies.hpp"
#include "GNodeArray.hpp"
#include "GModelSpectralNodes.hpp"
#include "GCTABackground.hpp"
/* __ Forward declarations _______________________________________________ */
/***********************************************************************//**
* @class GCTABackgroundPerfTable
*
* @brief CTA performance table background class
***************************************************************************/
class GCTABackgroundPerfTable : public GCTABackground {
public:
// Constructors and destructors
GCTABackgroundPerfTable(void);
explicit GCTABackgroundPerfTable(const GFilename& filename);
GCTABackgroundPerfTable(const GCTABackgroundPerfTable& bgd);
virtual ~GCTABackgroundPerfTable(void);
// Implemented pure virtual operators
virtual double operator()(const double& logE,
const double& detx,
const double& dety) const;
// Operators
GCTABackgroundPerfTable& operator=(const GCTABackgroundPerfTable& bgd);
// Implemented pure virtual methods
void clear(void);
GCTABackgroundPerfTable* clone(void) const;
std::string classname(void) const;
void load(const GFilename& filename);
GFilename filename(void) const;
GCTAInstDir mc(const GEnergy& energy,
const GTime& time,
GRan& ran) const;
const GModelSpectralNodes& spectrum(void) const;
double rate_ebin(const GCTAInstDir& dir,
const GEnergy& emin,
const GEnergy& emax) const;
std::string print(const GChatter& chatter = NORMAL) const;
// Methods
int size(void) const;
void sigma(const double& sigma);
const double& sigma(void) const;
private:
// Methods
void init_members(void);
void copy_members(const GCTABackgroundPerfTable& bgd);
void free_members(void);
double solidangle(void) const;
void init_mc_cache(void) const;
double rate(const double& logE) const;
// Radial integration class (used by solidangle() method). Note that
// the sigma parameter is given in rad^2
class integrand : public GFunction {
public:
integrand(const double& sigma) : m_sigma(sigma) { }
double eval(const double& x) {
double arg = x * x / m_sigma;
double arg2 = arg * arg;
double f = std::exp(-0.5 * arg2);
return (f*std::sin(x));
}
private:
double m_sigma;
};
// Members
GFilename m_filename; //!< Name of background response file
GEnergies m_energy; //!< Vector of energies
GNodeArray m_log10_energy; //!< log10(E) nodes for background interpolation
std::vector<double> m_background; //!< Background rate
std::vector<double> m_log_background; //!< log(background rate)
double m_sigma; //!< Sigma for offset angle computation (0=none)
// Monte Carlo cache
mutable GModelSpectralNodes m_mc_spectrum; //!< Background spectrum
};
/***********************************************************************//**
* @brief Return class name
*
* @return String containing the class name ("GCTABackgroundPerfTable").
***************************************************************************/
inline
std::string GCTABackgroundPerfTable::classname(void) const
{
return ("GCTABackgroundPerfTable");
}
/***********************************************************************//**
* @brief Return filename
*
* @return Returns filename from which the background was loaded.
***************************************************************************/
inline
GFilename GCTABackgroundPerfTable::filename(void) const
{
// Return filename
return m_filename;
}
/***********************************************************************//**
* @brief Return number of node energies in response
*
* @return Number of node energies.
***************************************************************************/
inline
int GCTABackgroundPerfTable::size(void) const
{
return (m_energy.size());
}
/***********************************************************************//**
* @brief Set sigma for offset angle dependence
*
* @param[in] sigma Sigma for offset angle dependence.
*
* Sets the sigma parameter for the offset angle dependence of the effective
* area. If @p sigma is 0, no offset angle dependency will be assumed. By
* default, @p sigma = 3.
***************************************************************************/
inline
void GCTABackgroundPerfTable::sigma(const double& sigma)
{
m_sigma = sigma;
return;
}
/***********************************************************************//**
* @brief Return sigma for offset angle dependence
*
* @return Sigma for offset angle dependence.
***************************************************************************/
inline
const double& GCTABackgroundPerfTable::sigma(void) const
{
return (m_sigma);
}
/***********************************************************************//**
* @brief Get response cube spectrum
*
* @return Response cube spectrum.
*
* Returns the response cube spectrum.
***************************************************************************/
inline
const GModelSpectralNodes& GCTABackgroundPerfTable::spectrum(void) const
{
if (m_mc_spectrum.nodes() == 0) {
init_mc_cache();
}
return (m_mc_spectrum);
}
#endif /* GCTABACKGROUNDPERFTABLE_HPP */