StdRandom Class

StdRandom Class

The StdRandom class provides static methods for generating random number from various discrete and continuous distributions, including Bernoulli, uniform, Gaussian, exponential, pareto, Poisson, and Cauchy. It also provides method for shuffling an array or subarray.

Inheritance Hierarchy

SystemObject
Algs4NetStdRandom

Namespace: Algs4Net
Assembly: Algs4Net (in Algs4Net.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

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public sealed class StdRandom

The StdRandom type exposes the following members.

Properties

	Name	Description
	Seed	The seed of the pseudorandom number generator. Using the same seed enables you to produce the same sequence of "random" number for each execution of the program. Ordinarily, you should set the seed at most once per program.

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Methods

	Name	Description
	Bernoulli	Returns a random boolean from a Bernoulli distribution with success probability 1/2.
	Bernoulli(Double)	Returns a random boolean from a Bernoulli distribution with success probability P.
	Cauchy	Returns a random real number from the Cauchy distribution.
	Discrete(Double)	Returns a random integer from the specified discrete distribution.
	Discrete(Int32)	Returns a random integer from the specified discrete distribution.
	Exp	Returns a random real number from an exponential distribution with rate lambda (λ).
	Gaussian	Returns a random real number from a standard Gaussian distribution.
	Gaussian(Double, Double)	Returns a random real number from a Gaussian distribution with mean mu (μ) and standard deviation sigma (σ).
	Geometric	Returns a random integer from a geometric distribution with success probability P.
	MainTest	Unit test the StdRandom methods
	Pareto	Returns a random real number from the standard Pareto distribution.
	Pareto(Double)	Returns a random real number from a Pareto distribution with shape parameter alpha (α).
	Poisson	Returns a random integer from a Poisson distribution with mean lambda (λ).
	Random	Returns a random real number uniformly in [0, 1).
	Shuffle(Double)	Rearranges the elements of the specified array in uniformly random order.
	Shuffle(Int32)	Rearranges the elements of the specified array in uniformly random order.
	Shuffle(Object)	Rearranges the elements of the specified array in uniformly random order.
	Shuffle(Double, Int32, Int32)	Rearranges the elements of the specified subarray in uniformly random order.
	Shuffle(Int32, Int32, Int32)	Rearranges the elements of the specified subarray in uniformly random order.
	Shuffle(Object, Int32, Int32)	Rearranges the elements of the specified subarray in uniformly random order.
	Uniform	Returns a random real number uniformly in [0, 1).
	Uniform(Int32)	Returns a random integer uniformly in [0, n).
	Uniform(Double, Double)	Returns a random real number uniformly in [a, b).
	Uniform(Int32, Int32)	Returns a random integer uniformly in [a, b).

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Remarks

For additional documentation, see Section 2.2 of Introduction to Programming in Java: An Interdisciplinary Approach by Robert Sedgewick and Kevin Wayne.

This class is a C# port from the original Java class StdRandom implementation by Robert Sedgewick and Kevin Wayne.

Reference

Algs4Net Namespace