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Gamma2 Class Reference

Inheritance diagram for Gamma2:

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Collaboration diagram for Gamma2:

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Public Member Functions

 Gamma2 (Real)
Real Density (Real) const
ExtReal Mean () const
ExtReal Variance () const

Private Attributes

Real alpha
Real ln_gam

Constructor & Destructor Documentation

Gamma2::Gamma2 (  Real   ) 
 

Definition at line 515 of file newran.cpp.

References alpha, ln_gam, and ln_gamma(). 

00515                           : AsymGen(alphax-1.0) // constructor (Real=shape)
00516 { alpha=alphax; ln_gam=ln_gamma(alpha); }

Member Function Documentation

Real Gamma2::Density (  Real   )  const [virtual]
 

Reimplemented from Random.

Definition at line 518 of file newran.cpp.

References Real. 

00519 {
00520    if (x<=0.0) return 0.0;
00521    double l = (alpha-1.0)*log(x) - x - ln_gam;
00522    return  (l < -40.0) ? 0.0 : exp(l);
00523 }

ExtReal Gamma2::Mean (   )  const [inline, virtual]
 

Reimplemented from AsymGen.

Definition at line 82 of file newran.cpp. 

00082 { return alpha; }

ExtReal Gamma2::Variance (   )  const [inline, virtual]
 

Reimplemented from AsymGen.

Definition at line 83 of file newran.cpp. 

00083 { return alpha; }

Field Documentation

Real Gamma2::alpha [private]
 

Definition at line 78 of file newran.cpp.

Referenced by Gamma2().

Real Gamma2::ln_gam [private]
 

Definition at line 78 of file newran.cpp.

Referenced by Gamma2().

The documentation for this class was generated from the following file:
Generated on Fri Dec 5 04:06:22 2003 for Borqueror by doxygen 1.3.3