edu.uci.ics.jung.utils
Class NumericalPrecision

java.lang.Object
  edu.uci.ics.jung.utils.NumericalPrecision

public final class NumericalPrecision

extends java.lang.Object

Implements additional mathematical functions to within numerical precision tolerances, and determines the parameters of the floating point representation.

Constructor Summary

NumericalPrecision()

Method Summary

static double	defaultNumericalPrecision()
static boolean	equal(double a, double b)
static boolean	equal(double a, double b, double precision)
static double	getLargestExponentialArgument()
static double	getLargestNumber() (c) Copyrights Didier BESSET, 1999, all rights reserved.
static double	getMachinePrecision()
static double	getNegativeMachinePrecision()
static int	getRadix()
static double	getSmallestNumber()
static void	printParameters(java.io.PrintStream printStream)
static void	reset()
static double	roundTo(double value, double scale) This method returns the specified value rounded to the nearest integer multiple of the specified scale.
static double	roundToScale(double value, boolean integerValued) Round the specified value upward to the next scale value.
static double	smallNumber() Returns the smallest number that the system can handle.

Methods inherited from class java.lang.Object

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

Constructor Detail

NumericalPrecision

public NumericalPrecision()

Method Detail

defaultNumericalPrecision

public static double defaultNumericalPrecision()

equal

public static boolean equal(double a,
                            double b)

Parameters:

a - double

b - double

Returns:

boolean true if the difference between a and b is less than the default numerical precision

equal

public static boolean equal(double a,
                            double b,
                            double precision)

Parameters:

a - double

b - double

precision - double

Returns:

boolean true if the relative difference between a and b is less than precision

getLargestExponentialArgument

public static double getLargestExponentialArgument()

getLargestNumber

public static double getLargestNumber()

(c) Copyrights Didier BESSET, 1999, all rights reserved.

getMachinePrecision

public static double getMachinePrecision()

getNegativeMachinePrecision

public static double getNegativeMachinePrecision()

getRadix

public static int getRadix()

getSmallestNumber

public static double getSmallestNumber()

printParameters

public static void printParameters(java.io.PrintStream printStream)

reset

public static void reset()

roundTo

public static double roundTo(double value,
                             double scale)

This method returns the specified value rounded to the nearest integer multiple of the specified scale.

Parameters:

value - number to be rounded

scale - defining the rounding scale

Returns:

rounded value

roundToScale

public static double roundToScale(double value,
                                  boolean integerValued)

Round the specified value upward to the next scale value.

Parameters:

value - the value to be rounded.

integerValued - a flag specified whether integer scale are used, otherwise double scale is used.

Returns:

a number rounded upward to the next scale value.

smallNumber

public static double smallNumber()

Returns the smallest number that the system can handle.

Returns:

double The smallest number the machine can handle.