Rafka86

    public static void Heun(NumericalModelWithODE model) => Heun(model, Console.Out);

    public static void Heun(NumericalModelWithODE model, TextWriter file) {
      var t = model.TimeStart;
      var te = model.TimeEnd;
      var x = model.InitialValues;

      file.WriteLine($"{t} {x}");
      while (t <= te) {
        x += HeunUpdate();

Rafka86

    public static void Rk4(NumericalModelWithODE model) => Rk4(model, Console.Out);

    public static void Rk4(NumericalModelWithODE model, TextWriter file) {
      var t = model.TimeStart;
      var te = model.TimeEnd;
      var x = model.InitialValues;
      const double frac6 = 1.0 / 6.0;
      var hDelta = Delta * 0.5;

      file.WriteLine($"{t} {x}");

Rafka86

using System;
using System.IO;

namespace NumericalLib {

  public static class Solver {
    private enum NumericalMethod {
      Euler,
      Heun,
      Rk4

Rafka86

using System.IO;

using NumericalLib;

using static System.Math;

namespace Projection {

  class Program {
    private class Projection : NumericalModelWithODE {