edu.stanford.nlp.math
Class ScientificNotationDouble

java.lang.Object
  |
  +--java.lang.Number
        |
        +--edu.stanford.nlp.math.ScientificNotationDouble

All Implemented Interfaces:

Serializable

public class ScientificNotationDouble

extends Number

ScientificNotationDouble allows very small and very large numbers to be multiplied without causing a floating point underflow/overflow. has a base (which is a double x s.t. 1<=x<10), and an exponent such that the double value of ScientificNotationDouble is base * 10^exponent note: ScientificNotationDouble does not handle negative numbers. this is to increase the speed.

See Also:

Serialized Form

Constructor Summary

ScientificNotationDouble()
creates a new ScientificNotationDouble with value 0

ScientificNotationDouble(double d)
constructs ScientificNotationDouble from a standard double

ScientificNotationDouble(double b, int e)
constructs ScientificNotationDouble given a base b and an exponent e

ScientificNotationDouble(int i)
constructs ScientificNotationDouble from a standard int

ScientificNotationDouble(ScientificNotationDouble other)
constructs ScientificNotationDouble from another ScientificNotationDouble

Method Summary

ScientificNotationDouble	add(ScientificNotationDouble addend) returns the sum of this and addend
ScientificNotationDouble	divide(ScientificNotationDouble divisor)
double	doubleValue()
void	ensureProperBase() ensures that the base of the ScientificNotationDouble is >=1 and <10.
float	floatValue()
double	getBase()
int	getExponent()
int	intValue()
long	longValue()
ScientificNotationDouble	multiply(ScientificNotationDouble multiplicand) returns product of this with multiplicand
void	reset() sets to zero
ScientificNotationDouble	scale(int e) returns a ScientificNotationdouble whose base is scaled so that it = base * 10^e the base may no longer be >=1 and <10 does not change this
void	set(double d)
void	set(double b, int e)
void	set(int i)
void	setBase(double b)
void	setExponent(int e)
void	setSmallToZero(int tolerance) set numbers which are smaller than 10^tolerance = 0 the tolerance should usually be a large negative number
String	toString()

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Constructor Detail

ScientificNotationDouble

public ScientificNotationDouble()

creates a new ScientificNotationDouble with value 0

ScientificNotationDouble

public ScientificNotationDouble(int i)

constructs ScientificNotationDouble from a standard int

ScientificNotationDouble

public ScientificNotationDouble(double d)

constructs ScientificNotationDouble from a standard double

ScientificNotationDouble

public ScientificNotationDouble(double b,
                                int e)

constructs ScientificNotationDouble given a base b and an exponent e

ScientificNotationDouble

public ScientificNotationDouble(ScientificNotationDouble other)

constructs ScientificNotationDouble from another ScientificNotationDouble

Method Detail

getBase

public double getBase()

getExponent

public int getExponent()

setBase

public void setBase(double b)

setExponent

public void setExponent(int e)

set

public void set(double b,
                int e)

reset

public void reset()

sets to zero

set

public void set(double d)

set

public void set(int i)

scale

public ScientificNotationDouble scale(int e)

returns a ScientificNotationdouble whose base is scaled so that it = base * 10^e the base may no longer be >=1 and <10 does not change this

ensureProperBase

public void ensureProperBase()

ensures that the base of the ScientificNotationDouble is >=1 and <10. used within addition, multiplication, and division routines

multiply

public ScientificNotationDouble multiply(ScientificNotationDouble multiplicand)

returns product of this with multiplicand

divide

public ScientificNotationDouble divide(ScientificNotationDouble divisor)

add

public ScientificNotationDouble add(ScientificNotationDouble addend)

returns the sum of this and addend

doubleValue

public double doubleValue()

Specified by:

doubleValue in class Number

floatValue

public float floatValue()

Specified by:

floatValue in class Number

intValue

public int intValue()

Specified by:

intValue in class Number

longValue

public long longValue()

Specified by:

longValue in class Number

toString

public String toString()

Overrides:

toString in class Object

setSmallToZero

public void setSmallToZero(int tolerance)

set numbers which are smaller than 10^tolerance = 0 the tolerance should usually be a large negative number