Package etomica.veos.bigdecimal

Class PartitionsP

java.lang.Object

etomica.veos.bigdecimal.PartitionsP

public class PartitionsP
extends java.lang.Object

Number of partitions.

Since:

2008-10-15

Field Summary

Fields

Modifier and Type	Field	Description
protected static java.util.Vector<java.math.BigInteger>	a	The list of all partitions as a vector.
protected static java.math.BigInteger	nMax	The maximum integer covered by the high end of the list.

Constructor Summary

Constructors

Constructor	Description
PartitionsP()	Default constructor initializing a list of partitions up to 7.

Method Summary

Modifier and Type	Method	Description
java.math.BigInteger	at(int i)	return the number of partitions of i
static void	main(java.lang.String[] args)	Test program.

Methods inherited from class java.lang.Object

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

Field Detail

a

protected static java.util.Vector<java.math.BigInteger> a

The list of all partitions as a vector.

nMax

protected static java.math.BigInteger nMax

The maximum integer covered by the high end of the list.

Constructor Detail

PartitionsP

public PartitionsP()

Default constructor initializing a list of partitions up to 7.

Method Detail

at

public java.math.BigInteger at(int i)

return the number of partitions of i

Parameters:

i - the zero-based index into the list of partitions

Returns:

the ith partition number. This is 1 if i=0 or 1, 2 if i=2 and so forth.

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Test program. It takes one integer argument n and prints P(n).
java -cp . org.nevec.rjm.PartitionsP n

Throws:

java.lang.Exception

Since:

2008-10-15