Class FastGaussianDistributionD

Creates random values using an approximate Gaussian distribution (double-precision).
Inheritance
System.Object
Distribution<System.Double>
FastGaussianDistributionD
Namespace: Mars.Numerics.Statistics
Assembly: Mars.Numerics.dll
Syntax
public class FastGaussianDistributionD : Distribution<double>
Remarks

Gaussian distribution is also known as Normal distribution.

The random values generated by this class follow only an approximate Gaussian distribution. The distribution curve can be imagined as a typical Gaussian bell curve within +/- 3 standard deviations. All random values lie in the interval [ExpectedValue - 3 * StandardDeviation, ExpectedValue + 3 * StandardDeviation]. No random values outside the +/- 3 standard deviation interval are returned.

This approximation is faster and makes the random values more controllable for game applications. For example, if in a game tree heights are determined using a real Gaussian distribution with an expected value of 10m and a standard deviation of 1m, then most trees will have a height near 10m. But it would also be possible - unlikely but possible - that a tree with height 30m is generated. This would look very odd. Therefore, it is desirable that the created random values do not exceed 3 standard deviations.

Constructors

FastGaussianDistributionD()

Initializes a new instance of the FastGaussianDistributionD class.
Declaration
public FastGaussianDistributionD()

FastGaussianDistributionD(Double, Double)

Initializes a new instance of the FastGaussianDistributionF class.
Declaration
public FastGaussianDistributionD(double expectedValue, double standardDeviation)
Parameters
Type Name Description
System.Double expectedValue The expected value.
System.Double standardDeviation The standard deviation.

Properties

ExpectedValue

Gets or sets the expected value.
Declaration
public double ExpectedValue { get; set; }
Property Value
Type Description
System.Double The expected value. The default is 0.

StandardDeviation

Gets or sets the standard deviation.
Declaration
public double StandardDeviation { get; set; }
Property Value
Type Description
System.Double The standard deviation. The default is 1.

Methods

Next(FastRandom)

Declaration
public override double Next(FastRandom random)
Parameters
Type Name Description
Mars.Common.Core.Random.FastRandom random
Returns
Type Description
System.Double
Overrides
Mars.Numerics.Statistics.Distribution<System.Double>.Next(Mars.Common.Core.Random.FastRandom)

Next(FastRandom, Double, Double)

Declaration
public double Next(FastRandom random, double expectedValue, double standardDeviation)
Parameters
Type Name Description
Mars.Common.Core.Random.FastRandom random
System.Double expectedValue
System.Double standardDeviation
Returns
Type Description
System.Double

Extension Methods