Exponential (Colt 1.2.0 - API Specification)
Keywords: cern.jet.random.Exponential class

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## cern.jet.random
Class Exponential

    java.lang.Object
      cern.colt.PersistentObject
          cern.jet.random.AbstractDistribution
              cern.jet.random.AbstractContinousDistribution
                  cern.jet.random.Exponential

All Implemented Interfaces:
  Cloneable, DoubleFunction, IntFunction, Serializable

public class Exponential
extends AbstractContinousDistribution

Exponential Distribution (aka Negative Exponential Distribution); See the math definition animated definition.

`p(x) = lambda*exp(-x*lambda)` for `x >= 0`, `lambda > 0`.

Instance methods operate on a user supplied uniform random number generator; they are unsynchronized.

Static methods operate on a default uniform random number generator; they are synchronized.

Version:
  1.0, 09/24/99
See Also:
  Serialized Form

Field Summary

Fields inherited from class cern.colt.PersistentObject
`serialVersionUID`

Constructor Summary
`Exponential(double lambda, RandomEngine randomGenerator)` Constructs a Negative Exponential distribution.

Method Summary
`double` | `cdf(double x)` Returns the cumulative distribution function.
`double` | `nextDouble()` Returns a random number from the distribution.
`double` | `nextDouble(double lambda)` Returns a random number from the distribution; bypasses the internal state.
`double` | `pdf(double x)` Returns the probability distribution function.
`void` | `setState(double lambda)` Sets the mean.
`static double` | `staticNextDouble(double lambda)` Returns a random number from the distribution with the given lambda.
`String` | `toString()` Returns a String representation of the receiver.

Methods inherited from class cern.jet.random.AbstractDistribution
`apply, apply, clone, makeDefaultGenerator, nextInt`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Exponential

    public Exponential(double lambda,
                       RandomEngine randomGenerator)

  Constructs a Negative Exponential distribution.

Method Detail

### cdf

    public double cdf(double x)

  Returns the cumulative distribution function.

### nextDouble

    public double nextDouble()

  Returns a random number from the distribution.

  Specified by:
    `nextDouble` in class `AbstractDistribution`

### nextDouble

    public double nextDouble(double lambda)

  Returns a random number from the distribution; bypasses the internal state.

### pdf

    public double pdf(double x)

  Returns the probability distribution function.

### setState

    public void setState(double lambda)

  Sets the mean.

### staticNextDouble

    public static double staticNextDouble(double lambda)

  Returns a random number from the distribution with the given lambda.

### toString

    public String toString()

  Returns a String representation of the receiver.

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