public void LogLinkFunctionConstructorTest2()
{
LogLinkFunction target = new LogLinkFunction();
Assert.AreEqual(1, target.B);
Assert.AreEqual(0, target.A);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = Math.Log(x);
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}
public void LogLinkFunctionConstructorTest()
{
double beta = 0.52;
double constant = 2.42;
LogLinkFunction target = new LogLinkFunction(beta, constant);
Assert.AreEqual(beta, target.B);
Assert.AreEqual(constant, target.A);
for (int i = 0; i < 11; i++)
{
double x = i / 10.0;
double y = (Math.Log(x) - constant) / beta;
Assert.AreEqual(y, target.Function(x), 1e-10);
Assert.AreEqual(x, target.Inverse(y), 1e-10);
}
}
public void DerivativeTest()
{
double beta = 0.52;
double constant = 2.42;
double[] expected =
{
5.84785, 6.15998, 6.48877, 6.83512, 7.19995, 7.58425,
7.98906, 8.41549, 8.86467, 9.33783, 9.83624
};
LogLinkFunction target = new LogLinkFunction(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-5);
Assert.AreEqual(expected[i], d2, 1e-5);
Assert.IsFalse(Double.IsNaN(d1));
Assert.IsFalse(Double.IsNaN(d2));
}
}
