public void ValidateDensity(double scale, double x)
{
var n = new Rayleigh(scale);
double expected = (x / (scale * scale)) * Math.Exp(-x * x / (2.0 * scale * scale));
Assert.AreEqual(expected, n.Density(x));
Assert.AreEqual(expected, Rayleigh.PDF(scale, x));
}
