edu.stanford.multiagent.gamer.functions
Class PolyFunction

java.lang.Object
  |
  +--edu.stanford.multiagent.gamer.ParameterizedObject
        |
        +--edu.stanford.multiagent.gamer.functions.Function
              |
              +--edu.stanford.multiagent.gamer.functions.PolyFunction

Direct Known Subclasses:

IncreasingPoly

public class PolyFunction

extends Function

Class implements a polynomial function of a single argument

Field Summary

protected double[]	coefs
protected static double	EPSILON
protected static int	MAX_ITER
protected static int	N_RESTARTS
protected static Parameters.ParamInfo[]	pfParam

Fields inherited from class edu.stanford.multiagent.gamer.functions.Function

dMax, dMin

Fields inherited from class edu.stanford.multiagent.gamer.ParameterizedObject

parameters

Constructor Summary

PolyFunction()

PolyFunction(double[] coefs, double dMin, double dMax)

Method Summary

protected void	checkParameters() Checks if Parameter values are consistent.
void	doGenerate() The only thing involved in generating the polynomial is storing the coefficients in a more easily accessable variable.
double	eval(double x) Evaluate the polynomial
edu.stanford.multiagent.gamer.functions.PolyFunction	getDerivative() Returns a derivative polynomial.
protected java.lang.String	getFunctionHelp() Returns a help string describing the function and the parameters taken by the function
void	getMinima(double a, double b, edu.stanford.multiagent.gamer.functions.PolyFunction deriv, java.util.Vector v) Appends all local minima in the specified interval to v.
double	getMinimum() Finds the minimum value of the function.
double	getMinimum(double a, double b, edu.stanford.multiagent.gamer.functions.PolyFunction deriv) Does gradient descent to get a local minimum in an interval a,b.
void	initialize() Calls initialize in the super class ParemeterizedObject which checks parameters
edu.stanford.multiagent.gamer.functions.PolyFunction	integrate() Integrates a polynomial and adds random constant term.
static void	main(java.lang.String[] args) Used only for testing.
void	randomizeParameters() Randomize things

Methods inherited from class edu.stanford.multiagent.gamer.functions.Function

getDMax, getDMin, getHelp, setDomain

Methods inherited from class edu.stanford.multiagent.gamer.ParameterizedObject

getBooleanParameter, getDescription, getDoubleParameter, getLongParameter, getParamDescription, getParameter, getParameters, getStringParameter, setParameter, setParameter, setParameters, setParameters

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON

protected static final double EPSILON

See Also:

Constant Field Values

MAX_ITER

protected static final int MAX_ITER

See Also:

Constant Field Values

N_RESTARTS

protected static final int N_RESTARTS

See Also:

Constant Field Values

pfParam

protected static Parameters.ParamInfo[] pfParam

coefs

protected double[] coefs

Constructor Detail

PolyFunction

public PolyFunction()
             throws java.lang.Exception

PolyFunction

public PolyFunction(double[] coefs,
                    double dMin,
                    double dMax)
             throws java.lang.Exception

Method Detail

getFunctionHelp

protected java.lang.String getFunctionHelp()

Description copied from class: Function

Returns a help string describing the function and the parameters taken by the function

Specified by:

getFunctionHelp in class Function

initialize

public void initialize()
                throws java.lang.Exception

Description copied from class: Function

Calls initialize in the super class ParemeterizedObject which checks parameters

Overrides:

initialize in class Function

Throws:

java.lang.Exception - if there is a problem with the parameters

checkParameters

protected void checkParameters()
                        throws java.lang.Exception

Description copied from class: ParameterizedObject

Checks if Parameter values are consistent. Must be implemented by every non-abstract subclass of ParameterizedObject.

Specified by:

checkParameters in class ParameterizedObject

Throws:

java.lang.Exception - if anything is wrong with the parameter values

doGenerate

public void doGenerate()

The only thing involved in generating the polynomial is storing the coefficients in a more easily accessable variable.

Specified by:

doGenerate in class ParameterizedObject

eval

public double eval(double x)

Evaluate the polynomial

Specified by:

eval in class Function

Parameters:

x - the point at which to evaluate the function

randomizeParameters

public void randomizeParameters()

Randomize things

Overrides:

randomizeParameters in class ParameterizedObject

getMinimum

public double getMinimum()

Finds the minimum value of the function. Note that this is probably not the best way to go about it. Ideally, should be changed to a better algorithm later.

getMinima

public void getMinima(double a,
                      double b,
                      edu.stanford.multiagent.gamer.functions.PolyFunction deriv,
                      java.util.Vector v)

Appends all local minima in the specified interval to v.

getMinimum

public double getMinimum(double a,
                         double b,
                         edu.stanford.multiagent.gamer.functions.PolyFunction deriv)

Does gradient descent to get a local minimum in an interval a,b.

getDerivative

public edu.stanford.multiagent.gamer.functions.PolyFunction getDerivative()
                                                                   throws java.lang.Exception

Returns a derivative polynomial.

java.lang.Exception

integrate

public edu.stanford.multiagent.gamer.functions.PolyFunction integrate()
                                                               throws java.lang.Exception

Integrates a polynomial and adds random constant term.

java.lang.Exception

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Used only for testing.

java.lang.Exception