public void DerivativeTest()
{
double[] expected =
{
0.5, 0.497502, 0.490033, 0.477668, 0.46053, 0.438791,
0.412668, 0.382421, 0.348353, 0.310805, 0.270151
};
SinLinkFunction target = new SinLinkFunction();
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = target.Inverse(x);
double d1 = target.Derivative(x);
double d2 = target.Derivative2(y);
Assert.AreEqual(expected[i], d1, 1e-6);
Assert.AreEqual(expected[i], d2, 1e-6);
Assert.IsFalse(Double.IsNaN(d1));
Assert.IsFalse(Double.IsNaN(d2));
}
}
public void SinLinkFunctionConstructorTest()
{
SinLinkFunction target = new SinLinkFunction();
Assert.AreEqual(-1, target.A);
Assert.AreEqual(2, target.B);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = (Math.Sin(x) + 1) / 2.0;
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}