Class Pi

java.lang.Object
  |
  +--Task
        |
        +--Pi

All Implemented Interfaces:

net.jini.core.entry.Entry, java.io.Serializable

public final class Pi

extends Task

Compute PI by evaluating the integral(4/(1+x*x)dx) from 0 to 1, which can be approximated by the discrete sum(4 / ((1+(k-1/2)**2))(1/N)) from k=1 to N. Not terribly fast, but didactically useful and easily coded for distribution to multiple machines.

Author:

Copyright (c) 2000,2003 mnoble@space.mit.edu
This code may only be used under the terms of GNU General Public License.

See Also:

Serialized Form

Field Summary

java.lang.Long	N
java.lang.Long	stepsize

Fields inherited from class Task

data, done, id, result

Constructor Summary

Pi()

Pi(long workerID, long nsubIntervals, long nworkers)

Method Summary

protected java.lang.Object	compute()
java.lang.Object	mergeResult(java.lang.Object r)
java.lang.String	name()
void	reportResult(java.lang.Object r)

Methods inherited from class Task

execute, finalize, keepData

Methods inherited from class java.lang.Object

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

Field Detail

N

public java.lang.Long N

stepsize

public java.lang.Long stepsize

Constructor Detail

Pi

public Pi()

Pi

public Pi(long workerID,
          long nsubIntervals,
          long nworkers)

Method Detail

compute

protected java.lang.Object compute()

Overrides:

compute in class Task

mergeResult

public java.lang.Object mergeResult(java.lang.Object r)

Overrides:

mergeResult in class Task

reportResult

public void reportResult(java.lang.Object r)

Overrides:

reportResult in class Task

name

public java.lang.String name()

Overrides:

name in class Task