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Java Source Code / Java Documentation » Science » Apache commons math 1.1 » org.apache.commons.math.stat.descriptive.summary

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.commons.math.stat.descriptive .AbstractStorelessUnivariateStatistic

org.apache.commons.math.stat.descriptive.summary .SumOfSquares

SumOfSquares

public class SumOfSquares extends AbstractStorelessUnivariateStatistic implements Serializable(Code)

Returns the sum of the squares of the available values.

If there are no values in the dataset, or any of the values are NaN, then NaN is returned.

Note that this implementation is not synchronized. If multiple threads access an instance of this class concurrently, and at least one of the threads invokes the increment() or clear() method, it must be synchronized externally.
version:
$Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $

Constructor Summary
public	SumOfSquares()

Method Summary
public void	clear()
public double	evaluate(double[] values, int begin, int length) Returns the sum of the squares of the entries in the specified portion of the input array, or `Double.NaN` if the designated subarray is empty.
public long	getN()
public double	getResult()
public void	increment(double d)

Constructor Detail

SumOfSquares
public SumOfSquares()(Code)
	Create a SumOfSquares instance

Method Detail

clear
public void clear()(Code)
	See Also: org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.clear

evaluate
public double evaluate(double[] values, int begin, int length)(Code)
	Returns the sum of the squares of the entries in the specified portion of the input array, or `Double.NaN` if the designated subarray is empty. Throws `IllegalArgumentException` if the array is null. Parameters: values - the input array Parameters: begin - index of the first array element to include Parameters: length - the number of elements to include the sum of the squares of the values or Double.NaN if length = 0 throws: IllegalArgumentException - if the array is null or the array indexparameters are not valid

getN
public long getN()(Code)
	See Also: org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.getN

getResult
public double getResult()(Code)
	See Also: org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.getResult

increment
public void increment(double d)(Code)
	See Also: org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.increment(double)

Methods inherited from org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic

abstract public void clear()(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
public double evaluate(double[] values)(Code)(Java Doc)
public double evaluate(double[] values, int begin, int length)(Code)(Java Doc)
abstract public double getResult()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
abstract public void increment(double d)(Code)(Java Doc)
public void incrementAll(double[] values)(Code)(Java Doc)
public void incrementAll(double[] values, int begin, int length)(Code)(Java Doc)

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