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/**
\file beta2d.hpp
\brief 2d beta
\author Junhua Gu
*/
#ifndef BETA_MODEL2d_H_
#define BETA_MODEL2d_H_
#define OPT_HEADER
#include <core/fitter.hpp>
#include <cmath>
#include <cassert>
#include "vecn.hpp"
namespace opt_utilities
{
template <typename T>
class beta2d
:public model<T,vecn<T,2>,std::vector<T>,std::string>
{
private:
model<T,vecn<T,2>,std::vector<T> >* do_clone()const
{
return new beta2d<T>(*this);
}
const char* do_get_type_name()const
{
return "2d beta model";
}
public:
beta2d()
{
this->push_param_info(param_info<std::vector<T> >("S0",1));
this->push_param_info(param_info<std::vector<T> >("rc1",100));
this->push_param_info(param_info<std::vector<T> >("rc2",100));
this->push_param_info(param_info<std::vector<T> >("rho",0));
this->push_param_info(param_info<std::vector<T> >("x0",100));
this->push_param_info(param_info<std::vector<T> >("y0",100));
this->push_param_info(param_info<std::vector<T> >("beta",2./3.));
this->push_param_info(param_info<std::vector<T> >("bkg",0));
}
T do_eval(const vecn<T,2>& xy,const std::vector<T>& param)
{
T S0=get_element(param,0);
T rc1=get_element(param,1);
T rc2=get_element(param,2);
T rho=get_element(param,3);
T x0=get_element(param,4);
T y0=get_element(param,5);
T beta=get_element(param,6);
T bkg=get_element(param,7);
T x=xy[0];
T y=xy[1];
T r=(x-x0)*(x-x0)/(rc1*rc1)+(y-y0)*(y-y0)/(rc2*rc2)
-2*rho*(x-x0)*(y-y0)/(rc1*rc2);
r=r<0?0:r;
return bkg+S0*pow(1+r,-3*beta+static_cast<T>(.5));
}
};
}
#endif
//EOF
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