Class Probs

java.lang.Object

net.sf.colossus.util.Probs

public final class Probs
extends Object

Class Probs holds utility methods for working with probabilities.

Author:

David Ripton

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static int	lastFakeDie
private static final Logger	LOGGER

Constructor Summary

Constructors

Constructor	Description
Probs()

Method Summary

Modifier and Type	Method	Description
static int	choose(int a, int b)	Compute a choose b.
static int	factorial(int n)	Compute n!
static double	meanHits(int dice, int strikeNumber)	Return the unrounded mean number of hits.
static int	modeHits(int dice, int strikeNumber)	Return the most likely number of hits.
static double	probHits(int dice, int strikeNumber, int hits)	Return the probability of getting exactly this number of hits.
static double	probHitsOrLess(int dice, int strikeNumber, int hits)	Return the probability of getting this number of hits or less.
static double	probHitsOrMore(int dice, int strikeNumber, int hits)	Return the probability of getting this number of hits or more.
static int	rollFakeDie()	Return the next die roll in a predictable regular sequence, useful for estimating combat results.

Methods inherited from class Object

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

Field Details

LOGGER

private static final Logger LOGGER

lastFakeDie

static int lastFakeDie

Constructor Details

Probs

public Probs()

Method Details

factorial

public static int factorial(int n)

Compute n!

choose

public static int choose(int a,
 int b)

Compute a choose b.

probHits

public static double probHits(int dice,
 int strikeNumber,
 int hits)

Return the probability of getting exactly this number of hits.

probHitsOrMore

public static double probHitsOrMore(int dice,
 int strikeNumber,
 int hits)

Return the probability of getting this number of hits or more.

probHitsOrLess

public static double probHitsOrLess(int dice,
 int strikeNumber,
 int hits)

Return the probability of getting this number of hits or less.

meanHits

public static double meanHits(int dice,
 int strikeNumber)

Return the unrounded mean number of hits.

modeHits

public static int modeHits(int dice,
 int strikeNumber)

Return the most likely number of hits. If there are two modes, return the higher one.

rollFakeDie

public static int rollFakeDie()

Return the next die roll in a predictable regular sequence, useful for estimating combat results. The current sequence is 436125.