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#ifndef CSTAT_HPP
#define CSTAT_HPP
#include <core/fitter.hpp>
#include <iostream>
using std::cout;using std::endl;
namespace opt_utilities
{
template<typename Ty,typename Tx,typename Tp,typename Ts,typename Tstr>
class cstat_poisson
:public statistic<Ty,Tx,Tp,Ts,Tstr>
{
private:
bool verb;
int n;
Ty lnfrac(Ty y)const
{
return y*log(y)-y;
}
public:
void verbose(bool v)
{
verb=v;
}
public:
statistic<Ty,Tx,Tp,Ts,Tstr>* do_clone()const
{
// return const_cast<statistic<Ty,Tx,Tp>*>(this);
return new cstat_poisson<Ty,Tx,Tp,Ts,Tstr>(*this);
}
Ts do_eval(const Tp& p)
{
Ts result(0);
for(int i=(this->datas()).size()-1;i>=0;--i)
{
Ty model_y=eval_model(this->datas().get_data(i).get_x(),p);
result+=model_y-this->datas().get_data(i).get_y()*log(model_y)+lnfrac(this->datas().get_data(i).get_y());
}
if(verb)
{
n++;
if(n%10==0)
{
cout<<result/this->p_fitter->get_dof()<<"\t";
for(int i=0;i<get_size(p);++i)
{
cout<<get_element(p,i)<<",";
}
cout<<endl;
}
}
return result;
}
};
}
#endif
//EOF
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