95 lines
3.7 KiB
C#
95 lines
3.7 KiB
C#
using System;
|
|
using System.Diagnostics.CodeAnalysis;
|
|
using System.Linq;
|
|
using System.Threading.Tasks;
|
|
using FastRng.Double;
|
|
using NUnit.Framework;
|
|
|
|
namespace FastRngTests.Double.Distributions
|
|
{
|
|
[ExcludeFromCodeCoverage]
|
|
public class Beta
|
|
{
|
|
[Test]
|
|
[Category(TestCategories.COVER)]
|
|
[Category(TestCategories.NORMAL)]
|
|
public async Task TestBetaDistribution01()
|
|
{
|
|
const double A = 2.0;
|
|
const double B = 2.0;
|
|
const double MEAN = A / (A + B);
|
|
const double VARIANCE = (A * B) / ((A + B) * (A + B) * (A + B + 1.0));
|
|
|
|
var dist = new FastRng.Double.Distributions.BetaA2B2();
|
|
var stats = new RunningStatistics();
|
|
var rng = new MultiThreadedRng();
|
|
|
|
for (var n = 0; n < 100_000; n++)
|
|
stats.Push(await rng.NextNumber(dist));
|
|
|
|
rng.StopProducer();
|
|
TestContext.WriteLine($"mean={MEAN} vs. {stats.Mean}");
|
|
TestContext.WriteLine($"variance={VARIANCE} vs {stats.Variance}");
|
|
|
|
Assert.That(stats.Mean, Is.EqualTo(MEAN).Within(0.1), "Mean is out of range");
|
|
Assert.That(stats.Variance, Is.EqualTo(VARIANCE).Within(0.01), "Variance is out of range");
|
|
}
|
|
|
|
[Test]
|
|
[Category(TestCategories.COVER)]
|
|
[Category(TestCategories.NORMAL)]
|
|
public async Task TestBetaGeneratorWithRange01()
|
|
{
|
|
var rng = new MultiThreadedRng();
|
|
var samples = new double[1_000];
|
|
for (var n = 0; n < samples.Length; n++)
|
|
samples[n] = await rng.NextNumber(-1.0, 1.0, new FastRng.Double.Distributions.BetaA2B2());
|
|
|
|
rng.StopProducer();
|
|
Assert.That(samples.Min(), Is.GreaterThanOrEqualTo(-1.0), "Min out of range");
|
|
Assert.That(samples.Max(), Is.LessThanOrEqualTo(1.0), "Max out of range");
|
|
}
|
|
|
|
[Test]
|
|
[Category(TestCategories.COVER)]
|
|
[Category(TestCategories.NORMAL)]
|
|
public async Task TestBetaGeneratorWithRange02()
|
|
{
|
|
var rng = new MultiThreadedRng();
|
|
var samples = new double[1_000];
|
|
for (var n = 0; n < samples.Length; n++)
|
|
samples[n] = await rng.NextNumber(0.0, 1.0, new FastRng.Double.Distributions.BetaA2B2());
|
|
|
|
rng.StopProducer();
|
|
Assert.That(samples.Min(), Is.GreaterThanOrEqualTo(0.0), "Min is out of range");
|
|
Assert.That(samples.Max(), Is.LessThanOrEqualTo(1.0), "Max is out of range");
|
|
}
|
|
|
|
[Test]
|
|
[Category(TestCategories.COVER)]
|
|
[Category(TestCategories.NORMAL)]
|
|
public async Task TestBetaGeneratorWithRange03()
|
|
{
|
|
var rng = new MultiThreadedRng();
|
|
var dist = new FastRng.Double.Distributions.BetaA2B2 { Random = rng }; // Test default parameters
|
|
|
|
var samples = new double[1_000];
|
|
for (var n = 0; n < samples.Length; n++)
|
|
samples[n] = await dist.GetDistributedValue();
|
|
|
|
rng.StopProducer();
|
|
Assert.That(samples.Min(), Is.GreaterThanOrEqualTo(0.0), "Min is out of range");
|
|
Assert.That(samples.Max(), Is.LessThanOrEqualTo(1.0), "Max is out of range");
|
|
}
|
|
|
|
[Test]
|
|
[Category(TestCategories.COVER)]
|
|
[Category(TestCategories.NORMAL)]
|
|
public async Task NoRandomNumberGenerator01()
|
|
{
|
|
var dist = new FastRng.Double.Distributions.BetaA2B2();
|
|
Assert.DoesNotThrowAsync(async () => await dist.GetDistributedValue());
|
|
Assert.That(await dist.GetDistributedValue(), Is.NaN);
|
|
}
|
|
}
|
|
} |