org.apache.commons.math.distribution
Class AbstractDistribution

java.lang.Object
  org.apache.commons.math.distribution.AbstractDistribution

All Implemented Interfaces:

Distribution, Serializable

Direct Known Subclasses:

AbstractContinuousDistribution, AbstractIntegerDistribution

public abstract class AbstractDistribution

extends Object

implements Distribution, Serializable

Base class for probability distributions.

Version:

$Revision: 1.2 $ $Date: 2004/11/07 20:39:15 $

See Also:

Serialized Form

Field Summary

(package private) static long

serialVersionUID Serializable version identifier

Constructor Summary

protected

AbstractDistribution() Default constructor.

Method Summary

double

cumulativeProbability(double x0, double x1) For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.math.distribution.Distribution

cumulativeProbability

Field Detail

serialVersionUID

static final long serialVersionUID

Serializable version identifier

See Also:

Constant Field Values

Constructor Detail

AbstractDistribution

protected AbstractDistribution()

Default constructor.

Method Detail

cumulativeProbability

public double cumulativeProbability(double x0,
                                    double x1)
                             throws MathException

For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).

The default implementation uses the identity

P(x0 ≤ X ≤ x1) = P(X ≤ x1) - P(X ≤ x0)

Specified by:

cumulativeProbability in interface Distribution

Parameters:

x0 - the (inclusive) lower bound

x1 - the (inclusive) upper bound

Returns:

the probability that a random variable with this distribution will take a value between x0 and x1, including the endpoints.

Throws:

MathException - if the cumulative probability can not be computed due to convergence or other numerical errors.

IllegalArgumentException - if x0 > x1