using System;

using System.Collections.Generic;

using System.Linq;

​

​

    public static class ExpSmoothingTask

    {

        public static IEnumerable<DataPoint> SmoothExponentialy(this IEnumerable<DataPoint> data, double alpha)

        {

            bool start = true;

            double previousExponenta = 0;

​

            foreach (DataPoint t1 in data)

            {

                DataPoint temp = new DataPoint()

                {

                    X = t1.X,

                    OriginalY = t1.OriginalY,

                    ExpSmoothedY= t1.ExpSmoothedY,

                    AvgSmoothedY= t1.AvgSmoothedY,

                    MaxY= t1.MaxY

                };

                if (start)

                {

                    temp.ExpSmoothedY = temp.OriginalY;

                    start = false;

                }

                else

                {

                    //ФОРМУЛА: E(t) = a*Y(t) - (1 - a)*E(t-1)

                    temp.ExpSmoothedY = alpha * temp.OriginalY + (1D - alpha) * previousExponenta;

                }

​

                previousExponenta = temp.ExpSmoothedY;

                yield return temp;

            }

        }

    }

​

    public class DataPoint

    {

        public double X;

        public double OriginalY;

        public double ExpSmoothedY;

        public double AvgSmoothedY;

        public double MaxY;

    }

​

public class Program

{   

    public static void Main()

    {

        DataPoint[] list = new DataPoint[6];

        list[0] = new DataPoint(){OriginalY = -1};

        list[1] = new DataPoint(){OriginalY = 1};

        list[2] = new DataPoint(){OriginalY = 0};

        list[3] = new DataPoint(){OriginalY = 2};

        list[4] = new DataPoint(){OriginalY = 4};

        list[5] = new DataPoint(){OriginalY = 6};       

        List<DataPoint> list_1 = new List<DataPoint>(list);

        List<DataPoint> list_2 = new List<DataPoint>(list);

        List<DataPoint> list1 = list_1.SmoothExponentialy(5d).ToList();

        List<DataPoint> list2 = list_2.SmoothExponentialy(2d).ToList();                     

        foreach(DataPoint dp in list1)

        {

            Console.WriteLine(dp.ExpSmoothedY);

        }

        Console.WriteLine();

        foreach(DataPoint dp in list2)

        {

            Console.WriteLine(dp.ExpSmoothedY);

        }

    }

}