public void DerivativeTest2()
{
IExpression exp = new Exp(new Mul(new Number(2), new Variable("x")));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(2 * 1) * exp(2 * x)", deriv.ToString());
}
public void DerivativeTest1()
{
IExpression exp = new Exp(new Variable("x"));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("1 * exp(x)", deriv.ToString());
}
public void DerivativeTest3()
{
// exp(2x)
Number num = new Number(2);
Variable x = new Variable("x");
Mul mul = new Mul(num, x);
IExpression exp = new Exp(mul);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(2 * 1) * exp(2 * x)", deriv.ToString());
num.Value = 6;
Assert.AreEqual("exp(6 * x)", exp.ToString());
Assert.AreEqual("(2 * 1) * exp(2 * x)", deriv.ToString());
}
public void PartialDerivativeTest3()
{
IExpression exp = new Exp(new Variable("x"));
IExpression deriv = exp.Differentiate(new Variable("y"));
Assert.AreEqual("0", deriv.ToString());
}
public void PartialDerivativeTest1()
{
IExpression exp = new Exp(new Mul(new Variable("x"), new Variable("y")));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(1 * y) * exp(x * y)", deriv.ToString());
}