public void TestNextGaussian()
{
Assert.Throws <ArgumentNullException>(() => Rand.NextGaussian(null));
var rand = this.GetRandom();
var gaussians = Enumerable.Range(0, 10000).Select(_ => rand.NextGaussian()).ToArray();
var average = gaussians.Average();
var stdev = RandTest.StandardDeviation(gaussians);
Assert.True(Math.Abs(average) < 0.05, "was " + average);
Assert.True(Math.Abs(stdev - 1) < 0.05, "was " + average);
}
public void TestShuffled()
{
Assert.Throws <ArgumentNullException>(() => Rand.Shuffled <int>(null, this.GetRandom()));
Enumerable.Range(0, 100)
.Shuffled(this.GetRandom())
.OrderBy(i => i)
.SequenceShouldEqual(Enumerable.Range(0, 100));
var shuffled = Enumerable.Range(0, 5000)
.Shuffled(this.GetRandom())
.ToArray();
var correlation = RandTest.Correlation(shuffled.Select(Convert.ToDouble).ToArray(), Enumerable.Range(0, shuffled.Length).Select(Convert.ToDouble).ToArray());
Assert.True(Math.Abs(correlation) < .05, correlation.ToString());
}
public void TestShuffle()
{
Assert.Throws <ArgumentNullException>(() => Rand.Shuffle <int>(null, this.GetRandom()));
var numbers = Enumerable.Range(0, 100).ToList();
numbers.Shuffle(this.GetRandom());
numbers.Sort();
numbers.SequenceShouldEqual(Enumerable.Range(0, 100));
var list = Enumerable.Range(0, 2000).ToList();
list.Shuffle(this.GetRandom());
var correlation = RandTest.Correlation(list.Select(Convert.ToDouble).ToArray(), Enumerable.Range(0, list.Count).Select(Convert.ToDouble).ToArray());
Assert.True(Math.Abs(correlation) < .05, correlation.ToString());
}
