private void Form1_Load(object sender, EventArgs e)
{
double[] inp = new double[] { -36, 33, -10, 1, 17, -32, 1, -3, 5 };
mainChart.Series.Clear();
mainChart.Series.Add("Frequencies");
Func <double, double> foo = PolynomialFactory.getPolynomialFunction(inp);
Func <double, double> fooD = PolynomialFactory.getPolynomialDerivative(inp);
ImprovedNewtonRaphsonMethodD rootFinder = new ImprovedNewtonRaphsonMethodD(foo, fooD);
double x1 = float.MinValue, x2 = 1.84;
double equalsTo = 0;
rootFinder.ExpandBracket(ref x1, ref x2, equalsTo);
double root = rootFinder.FindRoot(x1, x2, equalsTo);
MessageBox.Show("Root is: " + root + " x1: " + x1 + "; x2: " + x2);
}
public void FindRootTest1()
{
Func <double, double> polynomial = x => (x - 1) * (x - 10) * (x - 18);
Func <double, double> computeDerivative = x => 3 * x * x - 58 * x + 208;
ImprovedNewtonRaphsonMethodD rootFinder = new ImprovedNewtonRaphsonMethodD(polynomial, computeDerivative);
rootFinder.EpsilonX = Numeric.EpsilonD / 100;
double xRoot = rootFinder.FindRoot(0, 2);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(4, 10);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(10, 4);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(10, 12);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(2, 0);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(0, 3);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(3, 0);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-6, 2);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-1, 1);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-1, 1);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(0.9, 9.9);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(2, 3);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(3, 2);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
rootFinder.MaxNumberOfIterations = 1;
xRoot = rootFinder.FindRoot(0, 1000);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
}
public void FindRootTest1()
{
Func<double, double> polynomial = x => (x - 1)*(x - 10)*(x - 18);
Func<double, double> computeDerivative = x => 3 * x * x - 58 * x + 208;
ImprovedNewtonRaphsonMethodD rootFinder = new ImprovedNewtonRaphsonMethodD(polynomial, computeDerivative);
rootFinder.EpsilonX = Numeric.EpsilonD / 100;
double xRoot = rootFinder.FindRoot(0, 2);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(4, 10);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(10, 4);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(10, 12);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(2, 0);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(0, 3);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(3, 0);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-6, 2);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-1, 1);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(-1, 1);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(0.9, 9.9);
Assert.IsTrue(Numeric.AreEqual(0, polynomial(xRoot)));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(2, 3);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
xRoot = rootFinder.FindRoot(3, 2);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
rootFinder.MaxNumberOfIterations = 1;
xRoot = rootFinder.FindRoot(0, 1000);
Assert.IsTrue(double.IsNaN(xRoot));
Console.WriteLine("NumberOfIterations: {0}", rootFinder.NumberOfIterations);
}