Package etomica.veos

Class BigValue

java.lang.Object

etomica.veos.BigValue

All Implemented Interfaces:

IBigValue

public class BigValue
extends java.lang.Object
implements IBigValue

Data class to handle operations involving large numbers. Stores a value as the logarithm of its magnitude, and supports operations to add, multiply, etc. with other instances. Handles positive and negative values by keeping a separate field indicating sign of value. References to "value" in the comments indicate the value in its true form, not as logarithm.

Field Summary

Fields

Modifier and Type	Field	Description
static BigValue	ZERO

Constructor Summary

Constructors

Constructor	Description
BigValue()	Default constructor sets value to 0.0
BigValue(double value)	Constructs using the given value.
BigValue(double lnValue, boolean isPos)	Constructs given ln(|value|) and sign of value.
BigValue(IBigValue v)	Copy constructor.

Method Summary

Modifier and Type	Method	Description
void	DE(IBigValue ix)	Divide-equals (/=) operation.
void	E(double value)	Equals (=) operation.
void	E(IBigValue lv)	Equals (=) operation.
IBigValue	getZero()	Returns an instance of the class representing the value zero.
boolean	isPositive()	Returns true if this instance has a value greater than zero.
boolean	isZero()	Returns true if this instance has a value of zero.
double	lnValue()	Returns logarithm of the value represented by the instance.
static void	main(java.lang.String[] arg)
void	PE(IBigValue ilnx)	Plus-equals (+=) operation.
void	PEa1Tv1(double a1, IBigValue iv1)	Plus-equals (+=) a1 times v1.
void	TE(double a1)	Times-equals (*=).
void	TE(IBigValue ix)	Times-equals (*=) operation.
void	TEln(double lnx)	Times-equals (*=) operation, multiplying by a value given as its logarithm.
double	value()	Returns the value held by the instance (in true form, not as log, and with sign applied).

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

public static final BigValue ZERO

Constructor Detail

BigValue

public BigValue()

Default constructor sets value to 0.0

BigValue

public BigValue(double value)

Constructs using the given value.

BigValue

public BigValue(double lnValue,
                boolean isPos)

Constructs given ln(|value|) and sign of value.

BigValue

public BigValue(IBigValue v)

Copy constructor.

Method Detail

getZero

public IBigValue getZero()

Description copied from interface: IBigValue

Returns an instance of the class representing the value zero.

Specified by:

getZero in interface IBigValue

isZero

public boolean isZero()

Description copied from interface: IBigValue

Returns true if this instance has a value of zero.

Specified by:

isZero in interface IBigValue

value

public double value()

Returns the value held by the instance (in true form, not as log, and with sign applied).

Specified by:

value in interface IBigValue

isPositive

public boolean isPositive()

Description copied from interface: IBigValue

Returns true if this instance has a value greater than zero.

Specified by:

isPositive in interface IBigValue

lnValue

public double lnValue()

Returns logarithm of the value represented by the instance. Returns NaN if the value is negative.

Specified by:

lnValue in interface IBigValue

E

public final void E(double value)

Equals (=) operation. Assigns the given value to this instance, replacing current value.

Specified by:

E in interface IBigValue

E

public final void E(IBigValue lv)

Equals (=) operation. Assigns given value (specified via another instance of LogValue) to this instance, replacing current value.

Specified by:

E in interface IBigValue

PE

public void PE(IBigValue ilnx)

Plus-equals (+=) operation. Replaces the current value with the one obtained by adding the given value, considering signs of both.

Specified by:

PE in interface IBigValue

PEa1Tv1

public void PEa1Tv1(double a1,
                    IBigValue iv1)

Plus-equals (+=) a1 times v1.

Specified by:

PEa1Tv1 in interface IBigValue

TE

public void TE(IBigValue ix)

Times-equals (*=) operation. Replaces the current value with the one obtained by multiplying the given value, considering signs of both.

Specified by:

TE in interface IBigValue

DE

public void DE(IBigValue ix)

Divide-equals (/=) operation. Replaces the current value with the one obtained by dividing the given value, considering signs of both.

Specified by:

DE in interface IBigValue

TE

public void TE(double a1)

Times-equals (*=). Replaces current value by multiplying it by the given value.

Specified by:

TE in interface IBigValue

Parameters:

a1 -

TEln

public void TEln(double lnx)

Times-equals (*=) operation, multiplying by a value given as its logarithm. Value (i.e., the value whose log is given as the argument) is assumed to be positive.

main

public static void main(java.lang.String[] arg)