public void DerivativeTest3()
{
IExpression exp = new Log(new Number(2), new Variable("x"));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("-(ln(2) * (1 / x)) / (ln(x) ^ 2)", deriv.ToString());
}
public void DerivativeTest1()
{
IExpression exp = new Log(new Variable("x"), new Number(2));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("1 / (x * ln(2))", deriv.ToString());
}
public void DerivativeTest2()
{
// log(x, 2)
Number num = new Number(2);
Variable x = new Variable("x");
IExpression exp = new Log(x, num);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("1 / (x * ln(2))", deriv.ToString());
num.Value = 4;
Assert.AreEqual("log(4, x)", exp.ToString());
Assert.AreEqual("1 / (x * ln(2))", deriv.ToString());
}
public void PartialDerivativeTest2()
{
IExpression exp = new Log(new Variable("x"), new Number(2));
IExpression deriv = exp.Differentiate(new Variable("y"));
Assert.AreEqual("0", deriv.ToString());
}