include/Geant4/G4GaussHermiteQ.hh

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0025 //
0026 // G4GaussHermiteQ
0027 //
0028 // Class description:
0029 //
0030 // Roots of ortogonal polynoms and corresponding weights are calculated based on
0031 // iteration method (by bisection Newton algorithm). Constant values for initial
0032 // approximations were derived from the book:
0033 //   M. Abramowitz, I. Stegun, Handbook of mathematical functions,
0034 //   DOVER Publications INC, New York 1965 ; chapters 9, 10, and 22.
0035
0036 // Author: V.Grichine, 13.05.1997 V.Grichine
0037 // --------------------------------------------------------------------
0038 #ifndef G4GAUSSHERMITEQ_HH
0039 #define G4GAUSSHERMITEQ_HH 1
0040
0041 #include "G4VGaussianQuadrature.hh"
0042
0043 class G4GaussHermiteQ : public G4VGaussianQuadrature
0044 {
0045  public:
0046   // Constructor
0047
0048   G4GaussHermiteQ(function pFunction, G4int nHermite);
0049   // Constructor for Gauss-Hermite quadrature method.
0050   // The function GaussHermite should be called then.
0051
0052   G4GaussHermiteQ(const G4GaussHermiteQ&) = delete;
0053   G4GaussHermiteQ& operator=(const G4GaussHermiteQ&) = delete;
0054
0055   G4double Integral() const;
0056   // Gauss-Hermite method for integration of std::exp(-x*x)*nFunction(x) from
0057   // minus infinity to plus infinity.
0058 };
0059
0060 #endif