Accord.Math.Optimization.QuadraticObjectiveFunction.ToString C# (CSharp) Method

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();

            foreach (var term in quadratic)
                sb.AppendFormat("{0:+#;-#}{1}{2} ", term.Value, term.Key.Item1, term.Key.Item2);

            foreach (var term in linear)
                sb.AppendFormat("{0:+#;-#}{1} ", term.Value, term.Key);

            if (c != 0)
                sb.AppendFormat("{0:+#;-#} ", c);

            if (sb.Length > 0)
                sb.Remove(sb.Length - 1, 1);

            return sb.ToString();
        }