public void TestFactorsOfSum()
{
Expression <Func <double, double> > lambda = x => 2 + x;
List <Expression> factors = Elementary.Factors(lambda.Body);
Assert.AreEqual(1, factors.Count);
Assert.AreEqual(lambda.Body, factors[0]);
}
public void TestFactorsOfProduct()
{
Expression <Func <double, double> > lambda = x => 2 * x * Math.Sin(x);
List <Expression> factors = Elementary.Factors(lambda.Body);
Assert.AreEqual(3, factors.Count);
Assert.AreEqual("2", factors[0].ToString());
Assert.AreEqual("x", factors[1].ToString());
Assert.AreEqual("Sin(x)", factors[2].ToString());
}
public void TestFactorsOfProductWithQuotients()
{
Expression <Func <double, double> > lambda = x => 2 * (x / Math.Sin(x)) * (1 / (x * Math.Exp(x) * (1 + x)));
List <Expression> factors = Elementary.Factors(lambda.Body);
Assert.AreEqual(7, factors.Count);
Assert.AreEqual("2", factors[0].ToString());
Assert.AreEqual("x", factors[1].ToString());
Assert.AreEqual("(1 / Sin(x))", factors[2].ToString());
Assert.AreEqual("1", factors[3].ToString());
Assert.AreEqual("(1 / x)", factors[4].ToString());
Assert.AreEqual("(1 / Exp(x))", factors[5].ToString());
Assert.AreEqual("(1 / (1 + x))", factors[6].ToString());
}
public void TestFactorsOfNestedQuotients()
{
Expression <Func <double, double, double, double, double> > lambda = (a, b, c, d) => (a / b / (c * a)) * (c * d / a) / d;
List <Expression> factors = Elementary.Factors(lambda.Body);
Assert.AreEqual(8, factors.Count);
Assert.AreEqual("a", factors[0].ToString());
Assert.AreEqual("(1 / b)", factors[1].ToString());
Assert.AreEqual("(1 / c)", factors[2].ToString());
Assert.AreEqual("(1 / a)", factors[3].ToString());
Assert.AreEqual("c", factors[4].ToString());
Assert.AreEqual("d", factors[5].ToString());
Assert.AreEqual("(1 / a)", factors[6].ToString());
Assert.AreEqual("(1 / d)", factors[7].ToString());
}