/**
   \file beta1d.hpp
   \brief 1d beta model
   \author Junhua Gu
 */


#ifndef VBETA_MODEL_H_
#define VBETA_MODEL_H_
#define OPT_HEADER
#include <core/fitter.hpp>
#include <misc/optvec.hpp>
#include <cmath>

namespace opt_utilities
{
  template <typename T>
  class beta1d
    :public model<optvec<T>,optvec<T>,optvec<T>,std::string>
  {
    typedef optvec<T> Tv;
  private:
    beta1d<T>* do_clone()const
    {
      return new beta1d<T>(*this);
    }

    const char* do_get_type_name()const
    {
      return "1d surface brightness beta model";
    }
  public:
    beta1d()
    {
      this->push_param_info(param_info<Tv>("S0",1));
      this->push_param_info(param_info<Tv>("rc",10));
      this->push_param_info(param_info<Tv>("beta",2./3.));
      this->push_param_info(param_info<Tv>("bkg",0));
    }

  public:
    Tv do_eval(const Tv& x,const Tv& param)
    {
      Tv result(x.size());
      T S0=get_element(param,0);
      T r_c=get_element(param,1);
      T beta=get_element(param,2);
      T bkg=get_element(param,3);
      
      //return x*get_element(param,0)+get_element(param,1);
      for(size_t i=0;i!=x.size();++i)
	{
	  
	  result[i]=bkg+S0*pow(1+(x[i]*x[i])/(r_c*r_c),-3*beta+static_cast<T>(.5));

	}
      return result;
    }

  private:
    std::string do_get_information()const
    {
#include <model_doc/beta1d.info>
      return "";
    }
  };
}



#endif
//EOF