/**
   \file bpl1d.hpp
   \brief broken powerlaw
   \author Junhua Gu
 */


#ifndef BROKEN_POWER_LAW_MODEL_H_
#define BROKEN_POWER_LAW_MODEL_H_
#define OPT_HEADER
#include <core/fitter.hpp>
#include <cmath>

namespace opt_utilities
{
  template <typename T>
  class bpl1d
    :public model<T,T,std::vector<T>,std::string>
  {
  private:
    model<T,T,std::vector<T> >* do_clone()const
    {
      return new bpl1d<T>(*this);
    }

    const char* do_get_type_name()const
    {
      return "broken power law";
    }
  public:
    bpl1d()
    {
      this->push_param_info(param_info<std::vector<T> >("bpx",1));
      this->push_param_info(param_info<std::vector<T> >("bpy",1));
      this->push_param_info(param_info<std::vector<T> >("gamma1",1));
      this->push_param_info(param_info<std::vector<T> >("gamma2",1));
    }

    T do_eval(const T& x,const std::vector<T>& param)
    {
      T x_b=get_element(param,0);
      T f_b=get_element(param,1);
      T gamma1=get_element(param,2);
      T gamma2=get_element(param,3);
      if(x<x_b)
	{
	  return f_b*pow(x,gamma1)/pow(x_b,gamma1);
	}
      else
	{
	  return f_b*pow(x,gamma2)/pow(x_b,gamma2);
	}
    }


  private:
    std::string do_get_information()const
    {
      return "";
      //return "<math xmlns=\"http://www.w3.org/1998/Math/MathML\" display=\"block\" class=\"equation\"><mi>f</mi><mrow><mo class=\"MathClass-open\">(</mo><mrow><mi>x</mi><mo class=\"MathClass-punc\">;</mo><msub><mrow><mi>x</mi></mrow><mrow><mi>b</mi></mrow></msub><mo class=\"MathClass-punc\">,</mo><msub><mrow><mi>y</mi></mrow><mrow><mi>b</mi></mrow></msub><mo class=\"MathClass-punc\">,</mo><msub><mrow><mi>γ</mi></mrow><mrow><mn>1</mn></mrow></msub><mo class=\"MathClass-punc\">,</mo><msub><mrow><mi>γ</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mo class=\"MathClass-close\">)</mo></mrow> <mo class=\"MathClass-rel\">=</mo> <mfenced separators=\"\" open=\"{\" close=\"\"><mrow> <mtable style=\"\" equalrows=\"false\" equalcolumns=\"false\" class=\"array\"><mtr><mtd class=\"array\" columnalign=\"center\"><msub><mrow><mi>y</mi></mrow><mrow><mi>b</mi></mrow></msub> <mfrac><mrow><msup><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>γ</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></msup></mrow><mrow><msubsup><mrow><mi>x</mi></mrow><mrow><mi>b</mi></mrow><mrow><msub><mrow><mi>γ</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></msubsup></mrow></mfrac></mtd><mtd class=\"array\" columnalign=\"center\">   <mi>x</mi> <mo class=\"MathClass-rel\">&lt;</mo> <msub><mrow><mi>x</mi></mrow><mrow><mi>b</mi></mrow></msub></mtd></mtr><mtr><mtd class=\"array\" columnalign=\"center\"> <msub><mrow><mi>y</mi></mrow><mrow><mi>b</mi></mrow></msub> <mfrac><mrow><msup><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>γ</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></msup></mrow><mrow><msubsup><mrow><mi>x</mi></mrow><mrow><mi>b</mi></mrow><mrow><msub><mrow><mi>γ</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></msubsup></mrow></mfrac> </mtd><mtd class=\"array\" columnalign=\"center\"><mi>o</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>r</mi><mi>w</mi><mi>i</mi><mi>s</mi><mi>e</mi></mtd></mtr><mtr><mtd class=\"array\" columnalign=\"center\">        </mtd></mtr> <!--cc--></mtable></mrow></mfenced></math>";
    }
  };
}



#endif
//EOF