# bdm::emix Class Reference

Mixture of epdfs. More...

`#include <emix.h>`

List of all members.

## Public Member Functions
| emix ()
| Default constructor.
void | set_parameters (const vec &w, const Array< epdf * > &Coms, bool copy=false)
vec | sample () const
| Returns a sample, from density .
vec | mean () const
| return expected value
vec | variance () const
| return expected variance (not covariance!)
double | evallog (const vec &val) const
| Compute log-probability of argument `val`.
vec | evallog_m (const mat &Val) const
| Compute log-probability of multiple values argument `val`.
mat | evallog_M (const mat &Val) const
| Auxiliary function that returns pdflog for each component.
emix * | marginal (const RV &rv) const
| Return marginal density on the given RV, the remainig rvs are intergrated out.
mratio * | condition (const RV &rv) const
| Return conditional density on the given RV, the remaining rvs will be in conditioning.
vec & | _w ()
| returns a pointer to the internal mean value. Use with Care!
void | ownComs ()
| Auxiliary function for taking ownership of the Coms().
epdf * | _Coms (int i)
| access function
void | set_rv (const RV &rv)
| Name its rv.
virtual string | ToString ()
| This method returns a basic info about the current instance.
virtual void | from_setting (const Setting &root)
| This method arrange instance properties according the data stored in the Setting structure.
virtual void | to_setting (Setting &root) const
| This method save all the instance properties into the Setting structure.
Constructors
Construction of each epdf should support two types of constructors: empty constructor, copy constructor, The following constructors should be supported for convenience: constructor followed by calling `set_parameters()` constructor accepting random variables calling `set_rv()` All internal data structures are constructed as empty. Their values (including sizes) will be set by method `set_parameters()`. This way references can be initialized in constructors.
void | set_parameters (int dim0)
Matematical Operations
virtual mat | sample_m (int N) const
| Returns N samples, from density .
virtual void | qbounds (vec &lb, vec &ub, double percentage=0.95) const
| Lower and upper bounds of `percentage` % quantile, returns mean-2*sigma as default.
Connection to other classes
Description of the random quantity via attribute `rv` is optional. For operations such as sampling `rv` does not need to be set. However, for `marginalization` and `conditioning` `rv` has to be set. NB:
bool | isnamed () const
| True if rv is assigned.
const RV & | _rv () const
| Return name (fails when isnamed is false).
Access to attributes
int | dimension () const
| Size of the random variable.
## Protected Attributes
vec | w
| weights of the components
Array< epdf * > | Coms
| Component (epdfs).
bool | destroyComs
| Flag if owning Coms.
int | dim
| dimension of the random variable
RV | rv
| Description of the random variable.

## Detailed Description

Mixture of epdfs.

Density function:

where is any density on random variable , called component,

## Member Function Documentation

void bdm::emix::set_parameters | ( | const vec & | w,
|  | const Array< epdf * > & | Coms,
|  | bool | copy = `false` |
| ) |  |  |

Set weights `w` and components `Coms` By default Coms are copied inside. Parameter `copy` can be set to false if Coms live externally. Use method ownComs() if Coms should be destroyed by the destructor.

References Coms, destroyComs, bdm::epdf::dim, bdm::epdf::dimension(), and w.

Referenced by bdm::MixEF::epredictor(), bdm::egiwmix::marginal(), marginal(), and bdm::mmix::set_parameters().

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

- emix.h
- emix.cpp