Class MathUtils.KahanSummator

java.lang.Object

com.esri.core.geometry.MathUtils.KahanSummator

Enclosing class:

MathUtils

static final class MathUtils.KahanSummator
extends Object

The implementation of the Kahan summation algorithm. Use to get better precision when adding a lot of values.

Field Summary

Fields

Modifier and Type	Field	Description
private double	compensation
private double	startValue
private double	sum

Constructor Summary

Constructors

Constructor	Description
KahanSummator(double startValue_)	initialize to the given start value.

Method Summary

Modifier and Type	Method	Description
(package private) void	add(double v)	add a value.
(package private) void	add(MathUtils.KahanSummator v)	add another summator.
(package private) double	getResult()	Returns current value of the sum.
(package private) MathUtils.KahanSummator	minusEquals(double v)
(package private) MathUtils.KahanSummator	minusEquals(MathUtils.KahanSummator v)
(package private) MathUtils.KahanSummator	plusEquals(double v)
(package private) MathUtils.KahanSummator	plusEquals(MathUtils.KahanSummator v)
(package private) void	reset()	Resets the accumulated sum to zero.
(package private) void	sub(double v)	Subtracts a value.
(package private) void	sub(MathUtils.KahanSummator v)	Subtracts another summator.

Methods inherited from class Object

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

Field Details

sum

private double sum

compensation

private double compensation

startValue

private double startValue

Constructor Details

KahanSummator

KahanSummator(double startValue_)

initialize to the given start value. \param startValue_ The value to be added to the accumulated sum.

Method Details

reset

void reset()

Resets the accumulated sum to zero. The getResult() returns startValue_ after this call.

add

void add(double v)

add a value.

sub

void sub(double v)

Subtracts a value.

add

void add(MathUtils.KahanSummator v)

add another summator.

sub

void sub(MathUtils.KahanSummator v)

Subtracts another summator.

getResult

double getResult()

Returns current value of the sum.

plusEquals

MathUtils.KahanSummator plusEquals(double v)

minusEquals

MathUtils.KahanSummator minusEquals(double v)

plusEquals

MathUtils.KahanSummator plusEquals(MathUtils.KahanSummator v)

minusEquals

MathUtils.KahanSummator minusEquals(MathUtils.KahanSummator v)