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Java Source Code / Java Documentation » Science » Apache commons math 1.1 » org.apache.commons.math.random

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.math.random .ValueServer

ValueServer

public class ValueServer (Code)

Generates values for use in simulation applications.

How values are generated is determined by the mode property.

Supported mode values are:

DIGEST_MODE -- uses an empirical distribution
REPLAY_MODE -- replays data from valuesFileURL
UNIFORM_MODE -- generates uniformly distributed random values with mean = mu
EXPONENTIAL_MODE -- generates exponentially distributed random values with mean = mu
GAUSSIAN_MODE -- generates Gaussian distributed random values with mean = mu and standard deviation = sigma
CONSTANT_MODE -- returns mu every time.

version:
$Revision: 171283 $ $Date: 2005-05-21 22:25:44 -0700 (Sat, 21 May 2005) $

Field Summary
final public static int	CONSTANT_MODE
final public static int	DIGEST_MODE
final public static int	EXPONENTIAL_MODE
final public static int	GAUSSIAN_MODE
final public static int	REPLAY_MODE
final public static int	UNIFORM_MODE

Constructor Summary
public	ValueServer()
public	ValueServer(RandomData randomData) Construct a ValueServer instance using a RandomData as its source of random data.

Method Summary
public void	closeReplayFile() Closes `valuesFileURL` after use in REPLAY_MODE.
public void	computeDistribution() Computes the empirical distribution using values from the file in `valuesFileURL`, using the default number of bins.
public void	computeDistribution(int binCount) Computes the empirical distribution using values from the file in `valuesFileURL` and `binCount` bins.
public void	fill(double[] values) Fills the input array with values generated using getNext() repeatedly.
public double[]	fill(int length) Returns an array of length `length` with values generated using getNext() repeatedly.
public EmpiricalDistribution	getEmpiricalDistribution() Getter for property empiricalDistribution.
public int	getMode() Getter for property mode.
public double	getMu() Getter for property mu.
public double	getNext() Returns the next generated value, generated according to the mode value (see MODE constants).
public double	getSigma() Getter for property sigma.
public URL	getValuesFileURL()
public void	resetReplayFile() Resets REPLAY_MODE file pointer to the beginning of the `valuesFileURL`.
public void	setMode(int mode) Setter for property mode.
public void	setMu(double mu) Setter for property mu.
public void	setSigma(double sigma) Setter for property sigma.
public void	setValuesFileURL(String url)
public void	setValuesFileURL(URL url)

Field Detail

CONSTANT_MODE
final public static int CONSTANT_MODE(Code)
	Always return mu

DIGEST_MODE
final public static int DIGEST_MODE(Code)
	Use empirical distribution

EXPONENTIAL_MODE
final public static int EXPONENTIAL_MODE(Code)
	Exponential random deviates with mean = mu

GAUSSIAN_MODE
final public static int GAUSSIAN_MODE(Code)
	Gaussian random deviates with mean = mu, std dev = sigma

REPLAY_MODE
final public static int REPLAY_MODE(Code)
	Replay data from valuesFilePath

UNIFORM_MODE
final public static int UNIFORM_MODE(Code)
	Uniform random deviates with mean = mu

Constructor Detail

ValueServer
public ValueServer()(Code)
	Creates new ValueServer

ValueServer
public ValueServer(RandomData randomData)(Code)
	Construct a ValueServer instance using a RandomData as its source of random data. Parameters: randomData - the RandomData instance used to source random data since: 1.1

Method Detail

closeReplayFile
public void closeReplayFile() throws IOException(Code)
	Closes `valuesFileURL` after use in REPLAY_MODE. throws: IOException - if an error occurs closing the file

computeDistribution

public void computeDistribution() throws IOException(Code)

Computes the empirical distribution using values from the file in valuesFileURL, using the default number of bins.

valuesFileURL must exist and be readable by *this at runtime.

This method must be called before using getNext() with mode = DISGEST_MODE
throws:
IOException - if an I/O error occurs reading the input file

computeDistribution

public void computeDistribution(int binCount) throws IOException(Code)

Computes the empirical distribution using values from the file in valuesFileURL and binCount bins.

valuesFileURL must exist and be readable by *this at runtime.

This method must be called before using getNext() with mode = DISGEST_MODE
Parameters:
binCount - the number of bins used in computing the empiricaldistribution
throws:
IOException - if an error occurs reading the input file

fill
public void fill(double[] values) throws IOException(Code)
	Fills the input array with values generated using getNext() repeatedly. Parameters: values - array to be filled throws: IOException - in REPLAY_MODE if a file I/O error occurs

fill
public double[] fill(int length) throws IOException(Code)
	Returns an array of length `length` with values generated using getNext() repeatedly. Parameters: length - length of output array array of generated values throws: IOException - in REPLAY_MODE if a file I/O error occurs

getEmpiricalDistribution
public EmpiricalDistribution getEmpiricalDistribution()(Code)
	Getter for property empiricalDistribution. Value of property empiricalDistribution.

getMode
public int getMode()(Code)
	Getter for property mode. Value of property mode.

getMu
public double getMu()(Code)
	Getter for property mu. Value of property mu.

getNext
public double getNext() throws IOException(Code)
	Returns the next generated value, generated according to the mode value (see MODE constants). generated value throws: IOException - in REPLAY_MODE if a file I/O error occurs

getSigma
public double getSigma()(Code)
	Getter for property sigma. Value of property sigma.

getValuesFileURL
public URL getValuesFileURL()(Code)
	Getter for `valuesFileURL Value of property valuesFileURL.`

resetReplayFile
public void resetReplayFile() throws IOException(Code)
	Resets REPLAY_MODE file pointer to the beginning of the `valuesFileURL`. throws: IOException - if an error occurs opening the file

setMode
public void setMode(int mode)(Code)
	Setter for property mode. Parameters: mode - New value of property mode.

setMu
public void setMu(double mu)(Code)
	Setter for property mu. Parameters: mu - New value of property mu.

setSigma
public void setSigma(double sigma)(Code)
	Setter for property sigma. Parameters: sigma - New value of property sigma.

setValuesFileURL
public void setValuesFileURL(String url) throws MalformedURLException(Code)
	Sets the `valuesFileURL` using a string URL representation Parameters: url - String representation for new valuesFileURL. throws: MalformedURLException - if url is not well formed

setValuesFileURL
public void setValuesFileURL(URL url)(Code)
	Sets the `valuesFileURL` Parameters: url - New value of property valuesFileURL.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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