egamma Class Reference

Gamma posterior density. More...

#include <libEF.h>

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List of all members.

Public Member Functions

 egamma (const RV &rv)
 Default constructor.
void set_parameters (const vec &a, const vec &b)
 Sets parameters.
vec sample () const
 Returns the required moment of the epdf.
double evalpdflog (const vec &val) const
 TODO: is it used anywhere?
double lognc () const
 logarithm of the normalizing constant, $\mathcal{I}$
void _param (vec *&a, vec *&b)
 Returns poiter to alpha and beta. Potentially dengerous: use with care!
vec mean () const
 return expected value
virtual void tupdate (double phi, mat &vbar, double nubar)
 TODO decide if it is really needed.
virtual void dupdate (mat &v, double nu=1.0)
 TODO decide if it is really needed.
virtual mat sampleN (int N) const
 Returns N samples from density $epdf(rv)$.
virtual double eval (const vec &val) const
 Compute probability of argument val.
RV _rv () const
 access function

Protected Attributes

vec alpha
 Vector $\alpha$.
vec beta
 Vector $\beta$.
RV rv
 Identified of the random variable.


Detailed Description

Gamma posterior density.

Multvariate Gamma density as product of independent univariate densities.

\[ f(x|\alpha,\beta) = \prod f(x_i|\alpha_i,\beta_i) \]


Member Function Documentation

vec egamma::sample (  )  const [virtual]

Returns the required moment of the epdf.

Returns a sample, $x$ from density $epdf(rv)$

Implements epdf.

References alpha, beta, RV::count(), epdf::rv, and itpp::Gamma_RNG::setup().


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

Generated on Sat Aug 16 17:22:07 2008 for mixpp by  doxygen 1.5.6