Package org.cicirello.math.rand

Class RandomVariates

  • public final class RandomVariates
extends Object
    This utility class provides methods for generating random variates from different distributions.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int nextBinomial​(int n, double p)
      Generates a pseudorandom integer from a binomial distribution.
      static int nextBinomial​(int n, double p, Random r)
      Generates a pseudorandom integer from a binomial distribution.
      static int nextBinomial​(int n, double p, SplittableRandom r)
      Generates a pseudorandom integer from a binomial distribution.
      static double nextCauchy​(double scale)
      Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.
      static double nextCauchy​(double median, double scale)
      Generates a pseudorandom number from a Cauchy distribution.
      static double nextCauchy​(double median, double scale, Random r)
      Generates a pseudorandom number from a Cauchy distribution.
      static double nextCauchy​(double median, double scale, SplittableRandom r)
      Generates a pseudorandom number from a Cauchy distribution.
      static double nextCauchy​(double scale, Random r)
      Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.
      static double nextCauchy​(double scale, SplittableRandom r)
      Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.

    • Method Detail

      • nextBinomial

        public static int nextBinomial​(int n,
                               double p)
        Generates a pseudorandom integer from a binomial distribution. The source of randomness is via the ThreadLocalRandom class, and thus this method is both safe and efficient for use with threads.
        Parameters:
        n - Number of trials for the binomial distribution.
        p - The probability of a successful trial.
        Returns:
        A pseudorandom integer from a binomial distribution.

      • nextBinomial

        public static int nextBinomial​(int n,
                               double p,
                               Random r)
        Generates a pseudorandom integer from a binomial distribution.
        Parameters:
        n - Number of trials for the binomial distribution.
        p - The probability of a successful trial.
        r - The source of randomness.
        Returns:
        A pseudorandom integer from a binomial distribution.

      • nextBinomial

        public static int nextBinomial​(int n,
                               double p,
                               SplittableRandom r)
        Generates a pseudorandom integer from a binomial distribution.
        Parameters:
        n - Number of trials for the binomial distribution.
        p - The probability of a successful trial.
        r - The source of randomness.
        Returns:
        A pseudorandom integer from a binomial distribution.

      • nextCauchy

        public static double nextCauchy​(double median,
                                double scale)
        Generates a pseudorandom number from a Cauchy distribution.
        Parameters:
        median - The median of the Cauchy.
        scale - The scale parameter of the Cauchy.
        Returns:
        a pseudorandom number from a Cauchy distribution

      • nextCauchy

        public static double nextCauchy​(double scale)
        Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.
        Parameters:
        scale - The scale parameter of the Cauchy.
        Returns:
        a pseudorandom number from a Cauchy distribution

      • nextCauchy

        public static double nextCauchy​(double median,
                                double scale,
                                Random r)
        Generates a pseudorandom number from a Cauchy distribution.
        Parameters:
        median - The median of the Cauchy.
        scale - The scale parameter of the Cauchy.
        r - The source of randomness.
        Returns:
        a pseudorandom number from a Cauchy distribution

      • nextCauchy

        public static double nextCauchy​(double scale,
                                Random r)
        Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.
        Parameters:
        scale - The scale parameter of the Cauchy.
        r - The source of randomness.
        Returns:
        a pseudorandom number from a Cauchy distribution

      • nextCauchy

        public static double nextCauchy​(double median,
                                double scale,
                                SplittableRandom r)
        Generates a pseudorandom number from a Cauchy distribution.
        Parameters:
        median - The median of the Cauchy.
        scale - The scale parameter of the Cauchy.
        r - The source of randomness.
        Returns:
        a pseudorandom number from a Cauchy distribution

      • nextCauchy

        public static double nextCauchy​(double scale,
                                SplittableRandom r)
        Generates a pseudorandom number from a Cauchy distribution with median 0 and chosen scale parameter.
        Parameters:
        scale - The scale parameter of the Cauchy.
        r - The source of randomness.
        Returns:
        a pseudorandom number from a Cauchy distribution