using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Test();

    }

     public static void Test()

        {

            var r = new Random();

            var wfuncs = new[] {GetSomeNumbers(r, 0.8, 1.0), GetSomeNumbers(r, 0.8, 1.2), GetSomeNumbers(r, 1.1, 1.3),  GetSomeNumbers(r, 0.2, 1.3)}.ToList();

            Console.WriteLine(String.Join(", ", Generator(wfuncs).Take(10)));

            Console.WriteLine(String.Join(", ", 

                                          wfuncs[0]

                                              .Zip(wfuncs[1], (d, dnext) => d + dnext)

                                              .Zip(wfuncs[2], (d, dnext) => d + dnext)

                                              .Zip(wfuncs[3], (d, dnext) => d + dnext).Take(10)));

        }

​

        public static IEnumerable<double> GetSomeNumbers(Random r, double min, double max)

        {

            yield return min;

            yield return max;

            yield return 1.0;

            yield return 2.0;

            yield return 3.1;

            yield return 4.0;

            while (true)

            {

                yield return r.NextDouble() * (max - min) + min;

            }

        }

​

        public static IEnumerable<double> Generator(List<IEnumerable<double>> wfuncs)

        {

            return wfuncs.Aggregate((func, next) => func.Zip(next, (d, dnext) => d + dnext));

        }

​

}