Dotnet/FastRng
Dotnet/FastRng
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Use standard formula with updated parameters

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This commit is contained in:
Thorsten Sommer 2020-09-30 21:39:45 +02:00
parent 329057198d
commit 7b5727802f
1 changed files with 3 additions and 3 deletions
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6
FastRng/Double/Distributions/Normal.cs
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@ -8,7 +8,7 @@ namespace FastRng.Double.Distributions
public sealed class Normal : IDistribution public sealed class Normal : IDistribution
{ {
private const double SQRT_2PI = 2.506628275; private const double SQRT_2PI = 2.506628275;
private const double STDDEV = 0.4; private const double STDDEV = 0.2;
private const double MEAN = 0.5; private const double MEAN = 0.5;
private ShapeFitter fitter; private ShapeFitter fitter;
@ -24,11 +24,11 @@ namespace FastRng.Double.Distributions
set set
{ {
this.random = value; this.random = value;
this.fitter = new ShapeFitter(Normal.ShapeFunction, this.random, 50, 0.99); this.fitter = new ShapeFitter(Normal.ShapeFunction, this.random, 50, 1.93);
} }
} }
private static double ShapeFunction(double x) => 1.0 / (STDDEV * SQRT_2PI) * Math.Exp(-Math.Pow((x - MEAN) / STDDEV, 2.0)); private static double ShapeFunction(double x) => 1.0 / (STDDEV * SQRT_2PI) * Math.Exp(-0.5 * Math.Pow((x - MEAN) / STDDEV, 2.0));
public async ValueTask<double> GetDistributedValue(CancellationToken token = default) public async ValueTask<double> GetDistributedValue(CancellationToken token = default)
{ {