Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/include/G4LegendrePolynomial.hh

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 25 //
 26 //
 27 // -------------------------------------------------------------------
 28 //      GEANT4 Class file
 29 //
 30 //
 31 //      File name:     G4LegendrePolynomial
 32 //
 33 //      Author:        Jason Detwiler (jasondet@gmail.com)
 34 // 
 35 //      Creation date: February 2015
 36 //
 37 //      Modifications: 29 October 2024 Isaac Kunen
 38 //      
 39 //      Legendre Polynomial
 40 //
 41 // -------------------------------------------------------------------
 42 
 43 #ifndef G4LEGENDREPOLYNOMIAL_HH
 44 #define G4LEGENDREPOLYNOMIAL_HH
 45 
 46 #include "globals.hh"
 47 #include <vector>
 48 #include <map>
 49 
 50 class G4LegendrePolynomial
 51 {
 52   public:
 53     // Access to coefficients
 54     static std::size_t GetNCoefficients(std::size_t order) { return order+1; }
 55     G4double GetCoefficient(std::size_t i, std::size_t order);
 56 
 57     // Evaluation functions
 58     G4double EvalLegendrePoly(G4int order, G4double x);
 59 
 60     G4double EvalAssocLegendrePoly(G4int l, G4int m, G4double x);
 61 
 62     // cache is not used; use EvalAssocLegendrePoly(l, m, x) instead.
 63     G4double EvalAssocLegendrePoly(G4int l, G4int m, G4double x,
 64       std::map<G4int, std::map<G4int, G4double> >* cache)
 65     {
 66       (void) cache; // suppress compiler warning for unused cache
 67       return EvalAssocLegendrePoly(l, m, x); 
 68     }
 69 
 70   protected: // Cache coefficients for speed
 71     void BuildUpToOrder(std::size_t order);
 72     std::vector< std::vector<G4double> > fCoefficients;
 73 };
 74 
 75 #endif
 76