///https://oeis.org/A001203
public void continued_fration_pi()
{
var seq = new[] { 3d, 7d, 15d, 1d, 292d, 1d, 1d };
// Define the argumetns for the Continued Fraction.
double fa(int n, double[] a) => a[n];
double fb(int n, double[] a) => 1;
var cf = new ContinuedFraction(fa, fb);
var pi = cf.Evaluate(seq.Length, seq);
Assert.Equal(pi, Math.PI, DecimalPrecision);
}
public void Evaluate_TestGoldenRatio()
{
Assert.That(ContinuedFraction.Evaluate(Enumerable.Repeat(1.0, 40).ToArray()),
Is.EqualTo(0.5 * (Math.Sqrt(5.0) + 1.0)).Within(1.0e-16));
}
public void Evaluate_TestInvalidArg()
{
Assert.Throws <ArgumentException>(() => ContinuedFraction.Evaluate(new double[] { }));
Assert.Throws <ArgumentException>(() => ContinuedFraction.Evaluate(null));
}
public void Evaluate_Test(double[] a, double expected)
{
Assert.That(ContinuedFraction.Evaluate(a), Is.EqualTo(expected).Within(1.0e-14));
}
