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// $Id: G4AdjointInterpolator.hh,v 1.4 2009/11/20 10:31:20 ldesorgh Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
/////////////////////////////////////////////////////////////////////////////////
//      Module:		G4AdjointInterpolator
//	Author:       	L. Desorgher
// 	Organisation: 	SpaceIT GmbH
//	Contract:	ESA contract 21435/08/NL/AT
// 	Customer:     	ESA/ESTEC
/////////////////////////////////////////////////////////////////////////////////
//
// CHANGE HISTORY
// --------------
//      ChangeHistory: 
//	 	1st April 2007 creation by L. Desorgher  		
//
//-------------------------------------------------------------
//	Documentation:
//		Used by  G4AdjointCSManager for interpolation purpose. 
//
#ifndef G4AdjointInterpolator_h
#define G4AdjointInterpolator_h 1

#include"globals.hh"
#include<vector>

////////////////////////////////////////////////////////////////////////////////
//
class G4AdjointInterpolator
{
	
  public:
	static G4AdjointInterpolator* GetAdjointInterpolator();
	static G4AdjointInterpolator* GetInstance();
        
  public:
 
	 ////////////////////////////////
        // Constructors and Destructor
        ////////////////////////////////
 
	
	~G4AdjointInterpolator();

        ////////////
        // Methods
	////////////
	
	//Caution everywher it is considere thta x_vec increase monotically
	
	G4double LinearInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2); 
	G4double LogarithmicInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2);
	G4double ExponentialInterpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double& y2);
	G4double Interpolation(G4double& x,G4double& x1,G4double& x2,G4double& y1,G4double &y2,G4String InterPolMethod="Log");
	
	
	size_t FindPosition(G4double& x,std::vector<G4double>& x_vec,size_t ind_min=0, size_t ind_max=0);
	
	size_t FindPositionForLogVector(G4double& x,std::vector<G4double>& x_vec);
	
	G4double Interpolate(G4double& x,std::vector<G4double>& x_vec,std::vector<G4double>& y_vec,G4String InterPolMethod="Log"); //xvec should monotically increase			
	
	G4double InterpolateWithIndexVector(G4double& x,std::vector<G4double>& x_vec,std::vector<G4double>& y_vec,
					    std::vector<size_t>& index_vec, G4double x0,G4double dx); //xvec should monotically increase			
	
	
	G4double InterpolateForLogVector(G4double& x,std::vector<G4double>& x_vec,std::vector<G4double>& y_vec);
   
   private:
  	static 	G4AdjointInterpolator* theInstance;
   
   private:
  	G4AdjointInterpolator();  
        
};
#endif
