org.das2.datum

Class RationalNumber

java.lang.Object

org.das2.datum.RationalNumber

public class RationalNumber
extends java.lang.Object

represent a rational number

Constructor Summary

Constructors

Constructor and Description
RationalNumber(double d) create a rationalNumber that is very close to d.
RationalNumber(int n) create a rationalNumber with n * 10^exp
RationalNumber(int n, int d) create a new rational number with numerator n and denominator d.
RationalNumber(Ratio n) create a rationalNumber with n * 10^exp
RationalNumber(Ratio n, Ratio exp) create a rationalNumber with n * 10^exp

Method Summary

Modifier and Type	Method and Description
RationalNumber	divide(RationalNumber number) divide by the number.
double	doubleValue() return a close representation using double.
boolean	isOne() return true if the number is 1.
boolean	isZero() return true if the number is 0.
RationalNumber	multiply(RationalNumber number) multiply by the number
static RationalNumber	parse(java.lang.String s) parse the string to get the RationalNumber.
RationalNumber	pow(Ratio r)
RationalNumber	sqrt() returns the sqrt of the number, e.g.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RationalNumber

public RationalNumber(double d)

create a rationalNumber that is very close to d.

Parameters:

d -

RationalNumber

public RationalNumber(Ratio n,
                      Ratio exp)

create a rationalNumber with n * 10^exp

Parameters:

n -

exp -

RationalNumber

public RationalNumber(Ratio n)

create a rationalNumber with n * 10^exp

Parameters:

n -

RationalNumber

public RationalNumber(int n)

create a rationalNumber with n * 10^exp

Parameters:

n -

RationalNumber

public RationalNumber(int n,
                      int d)

create a new rational number with numerator n and denominator d. The result will be n/d*10^0

Parameters:

n - the numerator

d - the denominator.

Method Detail

doubleValue

public double doubleValue()

return a close representation using double.

Returns:

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

parse

public static RationalNumber parse(java.lang.String s)
                            throws java.lang.NumberFormatException

parse the string to get the RationalNumber. This simply calls Double.parseDouble, but a future implementation could do a better job of this.

Parameters:

s - the string.

Returns:

the RationalNumber

Throws:

java.lang.NumberFormatException

divide

public RationalNumber divide(RationalNumber number)

divide by the number.

Parameters:

number -

Returns:

multiply

public RationalNumber multiply(RationalNumber number)

multiply by the number

Parameters:

number -

Returns:

pow

public RationalNumber pow(Ratio r)

sqrt

public RationalNumber sqrt()

returns the sqrt of the number, e.g. 4 * 10^

Returns:

isOne

public boolean isOne()

return true if the number is 1.

Returns:

true if the number is 1.

isZero

public boolean isZero()

return true if the number is 0.

Returns:

true if the number is 0.