public void AbsDerivativeTest2()
{
var num = new Number(2);
var x = new Variable("x");
var mul = new Mul(num, x);
var exp = new Abs(mul);
var deriv = Differentiate(exp);
Assert.Equal("2 * 1 * ((2 * x) / abs(2 * x))", deriv.ToString());
num.Value = 3;
Assert.Equal("abs(3 * x)", exp.ToString());
Assert.Equal("2 * 1 * ((2 * x) / abs(2 * x))", deriv.ToString());
}
public void AbsDerivativeTest2()
{
Number num = new Number(2);
Variable x = new Variable("x");
Mul mul = new Mul(num, x);
IExpression exp = new Abs(mul);
IExpression deriv = Differentiate(exp);
Assert.AreEqual("(2 * 1) * ((2 * x) / abs(2 * x))", deriv.ToString());
num.Value = 3;
Assert.AreEqual("abs(3 * x)", exp.ToString());
Assert.AreEqual("(2 * 1) * ((2 * x) / abs(2 * x))", deriv.ToString());
}
public void AbsToStringTest()
{
var exp = new Abs(new ComplexNumber(3, 2));
Assert.Equal("abs(3+2i)", exp.ToString());
}
public void PartialDerivativeTest3()
{
IExpression deriv = new Abs(new Variable("x")).Differentiate(new Variable("y"));
Assert.AreEqual("0", deriv.ToString());
}
public void DerivativeTest1()
{
IExpression exp = new Abs(new Variable("x")).Differentiate();
Assert.AreEqual("1 * (x / abs(x))", exp.ToString());
}
