29 lines
867 B
C#
29 lines
867 B
C#
using System;
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using System.Threading;
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using System.Threading.Tasks;
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namespace FastRng.Double.Distributions
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{
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public sealed class ChiSquareK10 : Distribution
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{
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private const double K = 10.0;
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private const double K_HALF = K * 0.5d;
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private const double K_HALF_MINUS_ONE = K_HALF - 1.0d;
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private const double CONSTANT = 0.252;
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private static readonly double DIVISOR;
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static ChiSquareK10()
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{
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var twoToTheKHalf = Math.Pow(2, K_HALF);
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var gammaKHalf = MathTools.Gamma(K_HALF);
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DIVISOR = twoToTheKHalf * gammaKHalf;
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}
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public ChiSquareK10(IRandom rng) : base(rng)
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{
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}
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private protected override double ShapeFunction(double x) => CONSTANT * ((Math.Pow(x, K_HALF_MINUS_ONE) * Math.Exp(-x * 0.5d)) / DIVISOR);
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}
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} |