Class DoubleUtil

java.lang.Object

org.ampere.base.env.DoubleUtil

public class DoubleUtil
extends Object

Utilities for doubles

Author:

hmorel

Constructor Summary

Constructors

Constructor	Description
DoubleUtil()

Method Summary

Modifier and Type	Method	Description
static boolean	equals(double x1, double x2, double eps)	compare to doubles
static boolean	greaterOrEqual(double x1, double x2, double eps)	compare to doubles
static double	relativeOrAbsoluteError(double delta, double value)	Compte the relative or absolute error of a difference, i.e.
static double	standardizedRelativeError(double x1, double x2)	compte the standardized relative error between two values, i.e.

Methods inherited from class java.lang.Object

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

Constructor Details

DoubleUtil

public DoubleUtil()

Method Details

standardizedRelativeError

public static double standardizedRelativeError(double x1,
 double x2)

compte the standardized relative error between two values, i.e. |x1-x2|/max(1,|x1|,|x2|)

Parameters:

x1 - first value

x2 - second value

Returns:

the standardized relative error.

relativeOrAbsoluteError

public static double relativeOrAbsoluteError(double delta,
 double value)

Compte the relative or absolute error of a difference, i.e. |delta|/max(1,|value|)

Parameters:

delta - difference

value - associated value

Returns:

the relative or absolute error.

equals

public static boolean equals(double x1,
 double x2,
 double eps)

compare to doubles

Parameters:

x1 - first value

x2 - second value

eps - expected accuracy

Returns:

true if the values match using the supplied accuracy

greaterOrEqual

public static boolean greaterOrEqual(double x1,
 double x2,
 double eps)

compare to doubles

Parameters:

x1 - first value

x2 - second value

eps - expected accuracy

Returns:

true if x1>x2 with the supplied accuracy