negative gamma prior More...
#include <prior.h>
Inheritance diagram for nGammaPrior:
Public Member Functions | |
| nGammaPrior (double shape, double scale) | |
| nGammaPrior (const nGammaPrior &original) | |
| copy constructor | |
| double | pdf (double x) const |
| return pdf at position x | |
| double | dpdf (double x) |
| return derivative of pdf | |
| double | rand (void) |
| draw a random number | |
| PsiPrior * | clone (void) const |
| clone by value | |
| double | mean (void) const |
| return the mean | |
| void | shrink (double xmin, double xmax) |
| shrink the prior if it is broader than the range between xmin and xmax | |
| int | get_code (void) const |
| return the typcode of this prior | |
| double | cdf (double x) const |
| return the typcode of this prior | |
| double | ppf (double p, double start=NULL) const |
Detailed Description
negative gamma prior
This defines a gamma prior that is defined for the negative axis. Thus, the pdf is defined by
![\[ f(x) = (-x)^{k-1} \frac{\exp(x/\theta)}{\theta^k\Gamma(k)}, \]](form_6.png)
for negative numbers and is zero otherwise.
The documentation for this class was generated from the following files:
- src/prior.h
- src/prior.cc
Generated on Mon Jul 4 2011 14:52:04 for Psi++ by
1.7.1