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/**
\file poly1d.hpp
\brief 1d polynomial
\author Junhua Gu
*/
#ifndef POLY_MODEL_H_
#define POLY_MODEL_H_
#define OPT_HEADER
#include <core/fitter.hpp>
#include <cmath>
#include <sstream>
#include <cassert>
namespace opt_utilities
{
template <typename T,int n>
class poly1d
:public model<T,T,std::vector<T>,std::string>
{
private:
model<T,T,std::vector<T> >* do_clone()const
{
return new poly1d<T,n>(*this);
}
const char* do_get_type_name()const
{
return "polynomial";
}
public:
poly1d()
{
assert(n>=0);
for(int i=0;i<=n;++i)
{
std::ostringstream ostr;
ostr<<"a"<<i;
this->push_param_info(param_info<std::vector<T> >(ostr.str().c_str(),1));
}
}
public:
T do_eval(const T& x,const std::vector<T>& param)
{
// return x*get_element(param,0)+get_element(param,1);
T result(0);
for(int i=0;i<=n;++i)
{
T xn(1);
for(int j=0;j<i;++j)
{
xn*=x;
}
result+=get_element(param,i)*xn;
}
return result;
}
private:
std::string do_get_information()const
{
std::ostringstream ostr;
ostr<<n<<"-order polynorminal model\n";
for(int i=0;i<n;++i)
{
ostr<<"a"<<i<<"*x^"<<i<<"+";
}
ostr<<"a"<<n<<"*x^"<<n;
return ostr.str();
}
};
}
#endif
//EOF
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