public void InverseLinkFunctionConstructorTest()
{
InverseLinkFunction target = new InverseLinkFunction();
Assert.AreEqual(0, target.A);
Assert.AreEqual(1, target.B);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = 1 / x;
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}
public void InverseLinkFunctionConstructorTest1()
{
double beta = 3.14;
double constant = 2.91;
InverseLinkFunction target = new InverseLinkFunction(beta, constant);
Assert.AreEqual(constant, target.A);
Assert.AreEqual(beta, target.B);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = (1 / x - constant) / beta;
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}
public void DerivativeTest()
{
double beta = 3.14;
double constant = 2.91;
double[] expected =
{
-0.370803, -0.302092, -0.25085, -0.21162, -0.180922,
-0.156449, -0.136626, -0.120345, -0.10681, -0.0954358, -0.0857865
};
InverseLinkFunction target = new InverseLinkFunction(beta, constant);
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));
}
}