G4AdjointInterpolator.cc

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//
// $Id: G4AdjointInterpolator.cc 71508 2013-06-17 11:57:13Z gcosmo $
//
#include "G4AdjointCSMatrix.hh"
#include "G4AdjointInterpolator.hh"

G4ThreadLocal G4AdjointInterpolator* G4AdjointInterpolator::theInstance = 0;
//
G4AdjointInterpolator* G4AdjointInterpolator::GetAdjointInterpolator()
{
  return GetInstance(); 
}

//
G4AdjointInterpolator* G4AdjointInterpolator::GetInstance()
{
  if(!theInstance)
  {
    theInstance = new  G4AdjointInterpolator;
  }
  return theInstance; 
}

//
G4AdjointInterpolator::G4AdjointInterpolator()
{
}

//
G4AdjointInterpolator::~G4AdjointInterpolator()
{
}

//
G4double G4AdjointInterpolator::LinearInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2)
{
  G4double res = y1+ (x-x1)*(y2-y1)/(x2-x1);
  //G4cout<<"Linear "<<res<<G4endl;
  return res;   
}

//
G4double G4AdjointInterpolator::LogarithmicInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2)
{
  if (y1<=0 || y2<=0 || x1<=0) return LinearInterpolation(x,x1,x2,y1,y2);
  G4double B=std::log(y2/y1)/std::log(x2/x1);
  //G4cout<<"x1,x2,y1,y2 "<<x1<<'\t'<<x2<<'\t'<<y1<<'\t'<<y2<<'\t'<<G4endl;
  G4double A=y1/std::pow(x1,B);
  G4double res=A*std::pow(x,B);
 // G4cout<<"Log "<<res<<G4endl;
  return res;
}

//
G4double G4AdjointInterpolator::ExponentialInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2)
{
  G4double B=(std::log(y2)-std::log(y1));
  B=B/(x2-x1);
  G4double A=y1*std::exp(-B*x1);
  G4double res=A*std::exp(B*x);
  return res;
}

//
G4double G4AdjointInterpolator::Interpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2,G4String InterPolMethod)
{
  if (InterPolMethod == "Log" ){
        return LogarithmicInterpolation(x,x1,x2,y1,y2);
  }
  else if (InterPolMethod == "Lin" ){
        return LinearInterpolation(x,x1,x2,y1,y2);
  }
  else if (InterPolMethod == "Exp" ){
        return ExponentialInterpolation(x,x1,x2,y1,y2);
  }
  else {
        //G4cout<<"The interpolation method that you invoked does not exist!"<<G4endl; 
        return -1111111111.;
  }
}

//
size_t  G4AdjointInterpolator::FindPosition(G4double& x,std::vector<G4double>& x_vec,size_t , size_t ) //only valid if x_vec is monotically increasing
{
   //most rapid nethod could be used probably
   //It is important to put std::vector<G4double>& such that the vector itself is used and not a copy
  
  
  size_t ndim = x_vec.size();
  size_t ind1 = 0;
  size_t ind2 = ndim - 1;
 /* if (ind_max >= ind_min){
        ind1=ind_min;
        ind2=ind_max;
        
  
  }
  */
  
  
  if (ndim >1) {
        
        if (x_vec[0] < x_vec[1] ) { //increasing
                do {
                        size_t midBin = (ind1 + ind2)/2;
                        if (x < x_vec[midBin])
                                        ind2 = midBin;
                        else 
                                        ind1 = midBin;
                } while (ind2 - ind1 > 1);
        }
        else {
                do {
                        size_t midBin = (ind1 + ind2)/2;
                        if (x < x_vec[midBin])
                                        ind1 = midBin;
                        else 
                                        ind2 = midBin;
                } while (ind2 - ind1 > 1);
        }
  
  }
        
  return ind1;
}

//
size_t  G4AdjointInterpolator::FindPositionForLogVector(G4double& log_x,std::vector<G4double>& log_x_vec) //only valid if x_vec is monotically increasing
{
   //most rapid nethod could be used probably
   //It is important to put std::vector<G4double>& such that the vector itself is used and not a copy
  return FindPosition(log_x, log_x_vec);
  /*
  if (log_x_vec.size()>3){ 
        size_t ind=0;
        G4double log_x1=log_x_vec[1];
        G4double d_log =log_x_vec[2]-log_x1;
        G4double dind=(log_x-log_x1)/d_log +1.;
        if (dind <1.) ind=0;
        else if (dind >= double(log_x_vec.size())-2.) ind =log_x_vec.size()-2;
        else ind =size_t(dind);
        return ind;
        
  }
  else  return FindPosition(log_x, log_x_vec);
  */
  
 
}

//
G4double G4AdjointInterpolator::Interpolate(G4double& x,std::vector<G4double>& x_vec,std::vector<G4double>& y_vec,G4String InterPolMethod)
{
  size_t i=FindPosition(x,x_vec);
  //G4cout<<i<<G4endl;
  //G4cout<<x<<G4endl;
  //G4cout<<x_vec[i]<<G4endl; 
  return Interpolation( x,x_vec[i],x_vec[i+1],y_vec[i],y_vec[i+1],InterPolMethod);
}

//
G4double G4AdjointInterpolator::InterpolateWithIndexVector(G4double& x,std::vector<G4double>& x_vec,std::vector<G4double>& y_vec,
                                            std::vector<size_t>& index_vec,G4double x0, G4double dx) //only linear interpolation possible
{
  size_t ind=0;
  if (x>x0) ind=int((x-x0)/dx);
  if (ind >= index_vec.size()-1) ind= index_vec.size()-2;
  size_t ind1 = index_vec[ind];
  size_t ind2 = index_vec[ind+1];
  if (ind1 >ind2) {
        size_t ind11=ind1;
        ind1=ind2;
        ind2=ind11;
  
  }
  ind=FindPosition(x,x_vec,ind1,ind2);
  return Interpolation( x,x_vec[ind],x_vec[ind+1],y_vec[ind],y_vec[ind+1],"Lin");
}                                           

//
G4double G4AdjointInterpolator::InterpolateForLogVector(G4double& log_x,std::vector<G4double>& log_x_vec,std::vector<G4double>& log_y_vec)
{
  //size_t i=0;
  size_t i=FindPositionForLogVector(log_x,log_x_vec);
  /*G4cout<<"In interpolate "<<G4endl;
  G4cout<<i<<G4endl;
  G4cout<<log_x<<G4endl;
  G4cout<<log_x_vec[i]<<G4endl;
  G4cout<<log_x_vec[i+1]<<G4endl;
  G4cout<<log_y_vec[i]<<G4endl;
  G4cout<<log_y_vec[i+1]<<G4endl;*/
  
  G4double log_y=LinearInterpolation(log_x,log_x_vec[i],log_x_vec[i+1],log_y_vec[i],log_y_vec[i+1]);
  return log_y;
}