Sigma

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        /// <summary>
        /// https://groophy-inc.github.io/sigma
        /// </summary>
        /// <param name="n"></param>
        /// <param name="to"></param>
        /// <param name="formula"></param>
        /// <returns></returns>
        public static GValue Sigma(GValue n, GValue to, string formula)
        {
            double result = 0;
            MathParser parser = new MathParser();
            parser.LocalVariables.Add("n", 0);
            for (int i = n.get_Int; i < to.get_Int;i++ )
            {
                parser.LocalVariables["n"] = i;
                result += parser.Parse(formula);
            }
            return new GValue((result.ToString()));
        }