private static fx df(CashItem cashItem, CashItem firstItem) { var totalDays = firstItem.Date.Subtract(cashItem.Date).TotalDays; return(x => (1.0 / DaysPerYear) * totalDays * cashItem.Amount * Math.Pow((x + 1.0), ((totalDays / DaysPerYear) - 1.0))); }
private static fx f(CashItem cashItem, CashItem firstItem) { var totalDays = firstItem.Date.Subtract(cashItem.Date).TotalDays; return(x => cashItem.Amount * Math.Pow((1.0 + x), totalDays / DaysPerYear)); }