using System; using System.Collections.Generic; using System.Linq; using System.Text; using V = Science.Mathematics.VectorCalculus; namespace VectorCalculus5Ed.Chapter3.Section1 { public class Example02 { public Example02() { } private string result; public string Result { get{return result;} } public void Compute() { Science.Mathematics.Function.ToLastType f = new Science.Mathematics.Function.ToLastType(func); double[] at = { 1.0, 0.5 }; V.IteratedPartialDerivative ddf = new V.IteratedPartialDerivative(f, at, 2); ddf.WithRespectToFirst = 1; ddf.WithRespectToSecond = 1; ddf.Compute(); result += ddf.Result.ToString() + "\r\n"; result += (2.0*Math.Sin(at[0])*Math.Cos(2.0*at[1])).ToString() + "\r\n"; ddf.WithRespectToFirst = 0; ddf.WithRespectToSecond = 1; ddf.Compute(); result += ddf.Result.ToString() + "\r\n"; result += (Math.Cos(at[0]) * Math.Sin(2.0 * at[1])).ToString() + "\r\n"; } private double func(double[] x) { return Math.Sin(x[0]) * Math.Sin(x[1]) * Math.Sin(x[1]); } } } /* 0.909297426844838 0.909297426825682 0.454648713659988 0.454648713412841 */