public void Can_Abs_Minus4()
{
var x = new Variable {
Name = "x", ValueInSI = -4
};
var evaluator = new Evaluator();
Assert.AreEqual(4, Sym.Abs(x).Eval(evaluator));
}
public void Can_Differentiate_Abs()
{
var x = new Variable {
Name = "x", ValueInSI = -3
};
var y = new Variable {
Name = "y", ValueInSI = 6
};
var evaluator = new Evaluator();
Assert.AreEqual(6, Sym.Abs(x * y).Diff(evaluator, x));
Assert.AreEqual(3, Sym.Abs(x * y).Diff(evaluator, y));
}