Power Weighted / Weighted delta

using System;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
 
namespace cAlgo
{
    [Levels(0)]
    [Indicator(IsOverlay = false, AccessRights = AccessRights.None)]
    public class mPWWdelta : Indicator
    {
        [Parameter("Period (14)", DefaultValue = 14)]
        public int inpPeriod { get; set; }
        [Parameter("Power (2.0)", DefaultValue = 2.0)]
        public double inpPower { get; set; }
 
        [Output("Power Weighted / Weighted delta", LineColor = "Black", PlotType = PlotType.Line, Thickness = 1)]
        public IndicatorDataSeries outPWWdelta { get; set; }
         
        double pw, summ, sumpw;
        private MovingAverage _wma;
 
        protected override void Initialize()
        {
            _wma = Indicators.MovingAverage(Bars.ClosePrices, inpPeriod, MovingAverageType.Weighted);
        }
 
        public override void Calculate(int i)
        {
            summ = 0;
            sumpw = 0;
            for(int j=0; j<inpPeriod; j++)
            {
                pw = Math.Pow(inpPeriod-j,inpPower);
                summ += pw * (i>inpPeriod+1 ? Bars.ClosePrices[i-j] : Bars.ClosePrices[i]);
                sumpw += pw;
            }
             
            outPWWdelta[i]= (sumpw!=0 ? summ/sumpw : double.NaN) - _wma.Result[i];
        }
    }
}