public static List <decimal> Linreg(List <decimal> source, int period = 14)
        {
            // int outBegIdx, outNbElement;
            double[] outValues = new double[source.Count];

            var sourceFix = source.Select(x => Convert.ToDouble(x)).ToArray();

            var ema = TA.LinearReg(0, source.Count - 1, sourceFix, period, out int outBegIdx, out int outNbElement, outValues);

            if (ema == TA.RetCode.Success)
            {
                return(outValues.Take(outNbElement).Select(x => Convert.ToDecimal(x)).ToList());
            }

            throw new Exception("Could not calculate RSI!");
        }
        public static Pine Linreg(Pine source, int period = 14)
        {
            // int outBegIdx, outNbElement;
            double[] outValues = new double[source.Count];

            var sourceFix = source.ToArray();

            var ema = TA.LinearReg(0, source.Count - 1, sourceFix, period, out int outBegIdx, out int outNbElement, outValues);

            if (ema == TA.RetCode.Success)
            {
                return(outValues.Take(outNbElement).ToPine());
            }

            throw new Exception("Could not calculate RSI!");
        }