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/**
\file component.hpp
\brief rpresents a distribution composed of more than one components
\author Junhua Gu
*/
#ifndef COMPONENT_MODEL_H_
#define COMPONENT_MODEL_H_
#define OPT_HEADER
#include <core/fitter.hpp>
#include <cmath>
#include <misc/optvec.hpp>
#include <sstream>
#include <iostream>
namespace opt_utilities
{
template <typename T>
class component
:public model<optvec<T>,optvec<T>,optvec<T>,std::string>
{
private:
std::vector<model<optvec<T>,optvec<T>,optvec<T>,std::string>*> components;
std::vector<int> weight_num;
private:
component* do_clone()const
{
return new component<T>(*this);
}
const char* do_get_type_name()const
{
return "Multi-distribution";
}
public:
component()
{
//this->push_param_info(param_info<optvec<T> >("x0",0));
//this->push_param_info(param_info<optvec<T> >("sigma",1));
}
component(const component& rhs)
{
for(int i=0;i<rhs.components.size();++i)
{
if(i>0)
{
add_component(*rhs.components[i],rhs.get_param_info(rhs.weight_num[i-1]).get_value());
}
else
{
add_component(*rhs.components[i]);
}
}
for(int i=0;i<rhs.get_num_params();++i)
{
set_param_info(rhs.get_param_info(i));
}
}
component& operator=(const component& rhs)
{
if(this==&rhs)
{
return rhs;
}
for(int i=0;i<components.size();++i)
{
components[i]->destroy();
}
components.clear();
for(int i=0;i<rhs.components.size();++i)
{
add_component(*rhs.components[i]);
}
for(int i=0;i<rhs.get_num_params();++i)
{
set_param_info(rhs.get_param_info(i));
}
}
~component()
{
for(int i=0;i<components.size();++i)
{
components[i]->destroy();
}
}
public:
void add_component(const model<optvec<T>,optvec<T>,optvec<T>,std::string>& m,const T& w=0)
{
int morder=components.size();
components.push_back(m.clone());
std::ostringstream oss;
oss<<morder;
std::string smorder=oss.str();
if(components.size()>1)
{
param_info<optvec<T>,std::string> p1(std::string("_w")+smorder,w);
this->push_param_info(p1);
weight_num.push_back(this->get_num_params()-1);
}
int np=m.get_num_params();
for(int i=0;i<np;++i)
{
param_info<optvec<T>,std::string> p(m.get_param_info(i));
param_info<optvec<T>,std::string> p1(p.get_name()+smorder,p.get_value());
this->push_param_info(p1);
}
}
optvec<T> convert_unit_sph(const optvec<T>& p)
{
int ndim=p.size()+1;
optvec<double> result(ndim);
result[0]=1;
for(int i=0;i<p.size();++i)
{
for(int j=0;j<=i;++j)
{
result[j]*=cos(p[i]);
}
result[i+1]=sin(p[i]);
}
for(int i=0;i<result.size();++i)
{
result[i]=result[i]*result[i];
}
return result;
}
optvec<T> do_eval(const optvec<T>& x,const optvec<T>& param)
{
T result(0);
optvec<T> weight_angle;
for(int i=0;i<weight_num.size();++i)
{
weight_angle.push_back(param[weight_num[i]]);
}
optvec<T> weight(convert_unit_sph(weight_angle));
int pnum=0;
for(int i=0;i<components.size();++i)
{
T temp_result=0;
optvec<T> p(components[i]->get_num_params());
for(int j=0;j<p.size();++j)
{
p[j]=param[pnum++];
}
result+=(components[i]->eval(x,p)[0]*weight[i]);
++pnum;
}
optvec<T> result1(1);
result1[0]=result;;
return result1;
}
private:
std::string do_get_information()const
{
return "";
}
};
}
#endif
//EOF
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