public void TestIirFrequencyResponse()
{
var a = new[]
{
1.005324035839730,
-1.979734945559880,
0.994675964160273
};
var b = new[]
{
1.009467623312100,
-1.979734945559880,
0.990532376687905
};
double[] frequencies =
{
20,
500,
1000,
1500,
20000
};
Complex[] target =
{
new Complex(1.00000174610533e+000, -1.16574212797254e-003),
new Complex(1.00193212578060e+000, -38.7298412403863e-003),
new Complex(1.77827941003874e+000, -1.72105381914270e-012),
new Complex(1.00618373847305e+000, 69.0973060921694e-003),
new Complex(1.00000048223708e+000, 612.629540369582e-006)
};
var result = Dsp.IirFrequencyResponse(a, b, frequencies, 44100).ToReadOnlyList();
FilterAssert.ListsAreReasonablyClose(result, target);
Assert.That(Dsp.IirFrequencyResponse(a, b, Enumerable.Empty <double>().ToReadOnlyList(), 44100).ToReadOnlyList().Count == 0);
Assert.Throws <ArgumentNullException>(() => Dsp.IirFrequencyResponse(null, b, frequencies, 44100).ToReadOnlyList());
Assert.Throws <ArgumentNullException>(() => Dsp.IirFrequencyResponse(a, null, frequencies, 44100).ToReadOnlyList());
Assert.Throws <ArgumentNullException>(() => Dsp.IirFrequencyResponse(a, b, null, 44100).ToReadOnlyList());
Assert.Throws <ArgumentOutOfRangeException>(() => Dsp.IirFrequencyResponse(a, b, frequencies, -1).ToReadOnlyList());
Assert.Throws <Exception>(() => Dsp.IirFrequencyResponse(Enumerable.Empty <double>().ToReadOnlyList(), b, frequencies, 44100).ToReadOnlyList());
Assert.Throws <Exception>(() => Dsp.IirFrequencyResponse(new [] { 0.0 }, b, frequencies, 44100).ToReadOnlyList());
}
