Package cern.jet.random

Class Exponential

  • All Implemented Interfaces:
    DoubleFunction, IntFunction, java.io.Serializable, java.lang.Cloneable
    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 Detail

      • lambda

        protected double lambda

    • 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​(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 java.lang.String toString()
        Returns a String representation of the receiver.
        Overrides:
        toString in class java.lang.Object

      • xstaticSetRandomGenerator

        private static void xstaticSetRandomGenerator​(RandomEngine randomGenerator)
        Sets the uniform random number generated shared by all static methods.
        Parameters:
        randomGenerator - the new uniform random number generator to be shared.