G4Pow Class Reference

#include <G4Pow.hh>

Public Member Functions
	~G4Pow ()
G4double	Z13 (G4int Z) const
G4double	A13 (G4double A) const
G4double	Z23 (G4int Z) const
G4double	A23 (G4double A) const
G4double	logZ (G4int Z) const
G4double	logA (G4double A) const
G4double	logX (G4double x) const
G4double	log10Z (G4int Z) const
G4double	log10A (G4double A) const
G4double	expA (G4double A) const
G4double	powZ (G4int Z, G4double y) const
G4double	powA (G4double A, G4double y) const
G4double	powN (G4double x, G4int n) const
G4double	factorial (G4int Z) const
G4double	logfactorial (G4int Z) const

Static Public Member Functions
static G4Pow *	GetInstance ()

Detailed Description

Definition at line 56 of file G4Pow.hh.

Constructor & Destructor Documentation

G4Pow::~G4Pow

(

)

Definition at line 123 of file G4Pow.cc.

{}

Member Function Documentation

G4double G4Pow::A13 ( G4double  A ) const

inline

Definition at line 132 of file G4Pow.hh.

{
  G4double res = 0.0;
  if(A > 0.0) 
  {
    G4double a = (1.0 <= A) ? A : 1.0/A;
    if(1.0 > A) { a = 1.0/A; }
    if(a <= maxA)
    {
      G4int i = G4int(a + 0.5);
      G4double x = (a/G4double(i) - 1.0)*onethird;
      res = pz13[i]*(1.0 + x - x*x*(1.0 - 1.66666666*x));
      if(1.0 > A) { res = 1.0/res; }
    }
    else
    {
      res = std::pow(A, onethird); 
    }
  }
  return res;
}

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G4double G4Pow::A23 ( G4double  A ) const

inline

Definition at line 160 of file G4Pow.hh.

{
  G4double x = A13(A);
  return x*x;
}

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G4double G4Pow::expA ( G4double  A ) const

inline

Definition at line 235 of file G4Pow.hh.

{
  G4double res;
  G4double a = (0.0 <= A) ? A : -A;

  if(a <= maxAexp)
  {
    G4int i = G4int(2*a + 0.5);
    G4double x = a - i*0.5;
    res = fexp[i]*(1.0 + x*(1.0 + 0.5*(1.0 + onethird*x)*x));
  }
  else
  {
    res = G4Exp(a);
  }
  if(0.0 > A) { res = 1.0/res; }
  return res;
}

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G4double G4Pow::factorial ( G4int  Z ) const

inline

Definition at line 264 of file G4Pow.hh.

{
  return fact[Z];
}

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G4Pow * G4Pow::GetInstance ( )

static

Definition at line 55 of file G4Pow.cc.

{
  if (fpInstance == 0)
  {
    static G4Pow geant4pow;
    fpInstance = &geant4pow;
  }
  return fpInstance;
}

G4double G4Pow::log10A ( G4double  A ) const

inline

Definition at line 230 of file G4Pow.hh.

{
  return logX(A)/lz[10];
}

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G4double G4Pow::log10Z ( G4int  Z ) const

inline

Definition at line 225 of file G4Pow.hh.

{
  return lz[Z]/lz[10];
}

G4double G4Pow::logA ( G4double  A ) const

inline

Definition at line 194 of file G4Pow.hh.

{
  return (1.0 <= A ? logBase(A) : -logBase(1./A));
}

G4double G4Pow::logfactorial ( G4int  Z ) const

inline

Definition at line 269 of file G4Pow.hh.

{
  return logfact[Z];
}

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G4double G4Pow::logX ( G4double  x ) const

inline

Definition at line 199 of file G4Pow.hh.

{
  G4double res = 0.0;
  G4double a = (1.0 <= x) ? x : 1.0/x;

  if(a <= maxA) 
  {
    res = logBase(a);
  }
  else if(a <= ener[2])
  {
    res = logen[1] + logBase(a/ener[1]);
  }
  else if(a <= ener[3])
  {
    res = logen[2] + logBase(a/ener[2]);
  }
  else
  {
    res = G4Log(a);
  }

  if(1.0 > x) { res = -res; }
  return res;
}

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G4double G4Pow::logZ ( G4int  Z ) const

inline

Definition at line 166 of file G4Pow.hh.

{
  return lz[Z];
}

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G4double G4Pow::powA ( G4double  A, G4double  y  ) const

inline

Definition at line 259 of file G4Pow.hh.

{
  return (0.0 == A ? 0.0 : expA(y*logX(A)));
}

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G4double G4Pow::powN	(	G4double	x,
		G4int	n
	)		const

Definition at line 128 of file G4Pow.cc.

{
  if(0.0 == x)        { return 0.0; }
  if(std::abs(n) > 8) { return std::pow(x, G4double(n)); }
  G4double res = 1.0;
  if(n >= 0) { for(G4int i=0; i<n; ++i) { res *= x; } }
  else if(n < 0)
  {
    G4double y = 1.0/x;
    G4int nn = -n;
    for(G4int i=0; i<nn; ++i) { res *= y; }
  }
  return res;
}

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G4double G4Pow::powZ ( G4int  Z, G4double  y  ) const

inline

Definition at line 254 of file G4Pow.hh.

{
  return expA(y*lz[Z]);
}

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G4double G4Pow::Z13 ( G4int  Z ) const

inline

Definition at line 127 of file G4Pow.hh.

{
  return pz13[Z];
}

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G4double G4Pow::Z23 ( G4int  Z ) const

inline

Definition at line 154 of file G4Pow.hh.

{
  G4double x = Z13(Z);
  return x*x;
}

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---

The documentation for this class was generated from the following files:

• geant4.10.03.p01/source/global/management/include/G4Pow.hh
• geant4.10.03.p01/source/global/management/src/G4Pow.cc