public void DifferentiateMexicanHatTest()
        {
            var differentiator = new Differentiator();
            var dx = differentiator.Differentiate("sin(sqrt(x^2+y^2))", "x", true);
            var res = differentiator.Differentiate(dx, "y", true);

            dx = differentiator.Differentiate("sin(sqrt(x^2+y^2))", "y", true);
            res = differentiator.Differentiate(dx, "x", true);
        }
Exemple #2
0
        void AssertSyntacticDerivativeEqualToNumericDerivative(Expression <Func <double, double> > func)
        {
            var    f            = func.Compile();
            double eps          = 1e-7;
            var    dfExpression = Differentiator.Differentiate(func);
            var    df           = dfExpression.Compile();

            for (double x = 0.5; x < 10; x += 0.5)
            {
                Assert.AreEqual((f(x + eps) - f(x - eps)) / (2 * eps), df(x), 1e-4);
            }
        }
        public void DifferentiateXYTest()
        {
            var differentiator = new Differentiator();
            var d = differentiator.Differentiate("x^2+y^2", "x", true);
            var res = differentiator.Differentiate(d, "y", true);

            d = differentiator.Differentiate("x^2+y^2", "y", true);
            res = differentiator.Differentiate(d, "x", true);

            d = differentiator.Differentiate("x^y", "x", true);
            // toto nezvladne t.j y*x^(y-1) podla y
            res = differentiator.Differentiate(d, "y", true);

            d = differentiator.Differentiate("x^y", "y", true);
            res = differentiator.Differentiate(d, "x", true);
        }