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riso.distributions
Class Product  

java.lang.Object
  riso.distributions.AbstractConditionalDistribution
      riso.distributions.FunctionalRelation
          riso.distributions.Product

All Implemented Interfaces:

ConditionalDistribution, java.io.Serializable

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public class Product

extends FunctionalRelation

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Field Summary
(package private)  int	ninputs           This is the number of inputs for this product.

 

Fields inherited from class riso.distributions.FunctionalRelation

NGRID

 

Fields inherited from class riso.distributions.AbstractConditionalDistribution

associated_variable

 

Constructor Summary

Product()           Default constructor for a product.

Product(int ninputs_in)           This constructor sets the number of inputs.

 

Method Summary
java.lang.Object	clone()           Return a copy of this object.
double[]	dFdx(double[] c)           Compute the gradient of the product of the inputs.
double	F(double[] c)           Compute the product of the inputs.
java.lang.String	format_string(java.lang.String leading_ws)           Create a description of this distribution as a string.
int	ndimensions_parent()           Return the number of dimensions of the parent variables.
void	pretty_input(riso.general.SmarterTokenizer st)           Read in a Product from an input stream.

 

Methods inherited from class riso.distributions.FunctionalRelation

component_roots, get_density, ndimensions_child, p, random

 

Methods inherited from class riso.distributions.AbstractConditionalDistribution

get_nstates, parse_string, pretty_output, set_variable, toString

 

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

ninputs

int ninputs

This is the number of inputs for this product. This is either specified directly (in a constructor) or by counting the number of parents of the associated variable.

Constructor Detail

Product

public Product()

Default constructor for a product. The number of inputs is set to 0; it is assumed that a variable will be associated with this distribution before any methods that need the number of inputs are called.

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Product

public Product(int ninputs_in)

This constructor sets the number of inputs.

Method Detail

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Return a copy of this object.

Specified by:

clone in interface ConditionalDistribution

Overrides:

clone in class FunctionalRelation

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ndimensions_parent

public int ndimensions_parent()

Return the number of dimensions of the parent variables.

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pretty_input

public void pretty_input(riso.general.SmarterTokenizer st)
                  throws java.io.IOException

Read in a Product from an input stream. This is intended for input from a human-readable source; this is different from object serialization. The input looks like this:

   { [ninputs ninputs-value] }
 

If ninputs is not specified, it is determined by counting parent variables.

Overrides:

pretty_input in class AbstractConditionalDistribution

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format_string

public java.lang.String format_string(java.lang.String leading_ws)
                               throws java.io.IOException

Create a description of this distribution as a string. If this distribution is associated with a variable, the number of inputs is not put into the description.

Specified by:

format_string in interface ConditionalDistribution

Overrides:

format_string in class FunctionalRelation

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F

public double F(double[] c)

Compute the product of the inputs.

Specified by:

F in class FunctionalRelation

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dFdx

public double[] dFdx(double[] c)

Compute the gradient of the product of the inputs.

Specified by:

dFdx in class FunctionalRelation

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