using System; using System.Collections.Generic; using System.Linq; using System.Text; using V = Science.Mathematics.VectorCalculus; namespace VectorCalculus5Ed.Chapter2.Section6 { public class Example01 { public Example01() { } 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 = {2.5,4.5,1.5 }; V.Gradient delf = new V.Gradient(f,at); delf.Compute(); result += delf.Result[0].ToString() + " "; result += delf.Result[1].ToString() + " "; result += delf.Result[2].ToString() + "\r\n"; result += (delf.Result[0]*delf.Result[0] + delf.Result[1]*delf.Result[1]+ delf.Result[2]*delf.Result[2]).ToString() + "\r\n"; } private double func(double[] x) { return Math.Sqrt(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]); } } } /* 0.466252404120089 0.839254327415347 0.279751442472656 0.999999999998682 */