org.apache.commons.math.distribution

Class AbstractDistribution

java.lang.Object

org.apache.commons.math.distribution.AbstractDistribution

All Implemented Interfaces:

java.io.Serializable, Distribution

Direct Known Subclasses:

AbstractContinuousDistribution, AbstractIntegerDistribution

public abstract class AbstractDistribution
extends java.lang.Object
implements Distribution, java.io.Serializable

Base class for probability distributions.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
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

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

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

cumulativeProbability

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.

java.lang.IllegalArgumentException - if x0 > x1