edu.northwestern.at.utils.math
Class Constants

java.lang.Object
  edu.northwestern.at.utils.math.Constants

public class Constants
extends java.lang.Object

Machine-dependent arithmetic constants.

Field Summary

static double	LN10
static double	LN10INV
static double	LN2
static double	LN2INV
static double	LNPI Natural log of PI.
static double	LNSQRT2PI
static double	MACHEPS Machine epsilon.
static double	MAXLOG Maximum logarithm value.
static int	MAXPREC
static double	MINLOG Minimum logarithm value.
static double	SQRT2 Square root of 2.
static double	SQRT2DIV2 ( Square root of 2 ) / 2 .
static double	SQRTPI Square root of PI.

Constructor Summary

protected

Constants() This class is non-instantiable but inheritable.

Method Summary

static double	determineMachineEpsilon() Determine machine epsilon.
static int	determineMaximumPrecision() Determine maximum double floating point precision.

Methods inherited from class java.lang.Object

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

Field Detail

MACHEPS

public static final double MACHEPS

Machine epsilon. Smallest double floating point number such that (1 + MACHEPS) > 1 .

MAXPREC

public static final int MAXPREC

MAXLOG

public static final double MAXLOG

Maximum logarithm value.

See Also:

Constant Field Values

MINLOG

public static final double MINLOG

Minimum logarithm value.

See Also:

Constant Field Values

SQRT2

public static final double SQRT2

Square root of 2.

SQRT2DIV2

public static final double SQRT2DIV2

( Square root of 2 ) / 2 .

SQRTPI

public static final double SQRTPI

Square root of PI.

LNPI

public static final double LNPI

Natural log of PI.

LN10

public static final double LN10

LN10INV

public static final double LN10INV

See Also:

Constant Field Values

LN2

public static final double LN2

LN2INV

public static final double LN2INV

LNSQRT2PI

public static final double LNSQRT2PI

Constructor Detail

Constants

protected Constants()

This class is non-instantiable but inheritable.

Method Detail

determineMachineEpsilon

public static double determineMachineEpsilon()

Determine machine epsilon.

Returns:

The machine epsilon as a double. The machine epsilon MACHEPS is the smallest number such that (1 + MACHEPS) == 1 .

determineMaximumPrecision

public static int determineMaximumPrecision()

Determine maximum double floating point precision.

Returns:

Maximum number of digits of precision for double precision floating point.