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riso.distributions
Class OrGate  

java.lang.Object
  riso.distributions.AbstractConditionalDistribution
      riso.distributions.OrGate

All Implemented Interfaces:

ConditionalDistribution, java.io.Serializable

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public class OrGate

extends AbstractConditionalDistribution

An object of this class represents an "or" gate. The output of the gate is 1 if any input is 1, and zero otherwise.

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

 

Fields inherited from class riso.distributions.AbstractConditionalDistribution

associated_variable

 

Constructor Summary

OrGate()           Default constructor for a or gate.

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

 

Method Summary
java.lang.Object	clone()           Return a copy of this object.
java.lang.String	format_string(java.lang.String leading_ws)           Create a description of this or gate as a string.
Distribution	get_density(double[] c)           For a given value c of the parents, return a distribution which represents p(x|C=c).
int	ndimensions_child()           Return the number of dimensions of the child variable.
int	ndimensions_parent()           Return the number of dimensions of the parent variables.
double	p(double[] x, double[] c)           Compute the probability that the output is 1 (if x[0]==1) or the output is 0 (if x[0]==0).
void	pretty_input(riso.general.SmarterTokenizer st)           Read in a OrGate from an input stream.
double[]	random(double[] c)           Return an instance of a random variable from this distribution.

 

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

Constructor Detail

OrGate

public OrGate()

Default constructor for a or gate. 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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OrGate

public OrGate(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 AbstractConditionalDistribution

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ndimensions_child

public int ndimensions_child()

Return the number of dimensions of the child variable.

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ndimensions_parent

public int ndimensions_parent()

Return the number of dimensions of the parent variables.

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get_density

public Distribution get_density(double[] c)
                         throws java.lang.Exception

For a given value c of the parents, return a distribution which represents p(x|C=c). Executing get_density(c). p(x) will yield the same result as p(x,c).

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p

public double p(double[] x,
                double[] c)
         throws java.lang.Exception

Compute the probability that the output is 1 (if x[0]==1) or the output is 0 (if x[0]==0). If x[0]==1, the return value is 1 if any c[i] is 1, otherwise return 0. Otherwise the return value is 1 minus the value computed for x[0]==1.

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random

public double[] random(double[] c)
                throws java.lang.Exception

Return an instance of a random variable from this distribution.

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pretty_input

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

Read in a OrGate 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] }
 

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

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> riso >> [ distributions overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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