EvoCalculator.Core/EvoCalculator.Core.Calculation/Columns/CashflowNSIBColumn.cs

using System;
using TridentGoalSeek;

namespace EvoCalculator.Core.Calculation.Columns
{
    public class CashflowNSIBColumn : BaseColumnWithGoalSeek
    {
        private readonly NSIBBruttoGrColumn _NSIBBruttoGrColumn;
        private readonly NSIBExpensesColumn _NSIBExpensesColumn;

        public CashflowNSIBColumn(int count, DateTempColumn dateTempColumn,
            NSIBBruttoGrColumn nsibBruttoGrColumn, NSIBExpensesColumn nsibExpensesColumn) : base(count, dateTempColumn)
        {
            _NSIBBruttoGrColumn = nsibBruttoGrColumn;
            _NSIBExpensesColumn = nsibExpensesColumn;
        }

        public override decimal Calculate(decimal inputVariable)
        {
            FillValues(inputVariable);
            return Convert.ToDecimal(IRR);
        }

        protected override void FillValues(decimal x)
        {
            Values[1] = _NSIBBruttoGrColumn.Values[1] - x;
            for (var i = 2; i < Values.Length; i++)
                Values[i] = _NSIBBruttoGrColumn.Values[i] -
                            x * _NSIBExpensesColumn.Values[i] / _NSIBExpensesColumn.Values[1];
        }

        public override void ComputeValues(decimal requiredValue)
        {
            var goalSeek = new GoalSeek(this);
            goalSeek.SeekResult(requiredValue,
                new GoalSeekOptions(
                    startingStabPoint: Convert.ToDecimal(_NSIBBruttoGrColumn.Values[0] / 2)
                    , tineExplorePercentage: 10
                    // , maximumAttempts: 10000
                    // , initialTineSpacing: 1
                    // , focusPercentage: 100
                    // , trimFinalInputValue: true
                ));
        }
    }
}