public ActionResult Simpson()
        {
            Simpson_Model model = new Simpson_Model();

            model.function = "sin(x)";
            model.a        = 0;
            model.b        = 3.1416;
            model.n        = 20;


            Simpson resultado = new Simpson();

            model.ans     = new Answer_Model();
            model.ans.Res = resultado.Calcular(model.function, model.a, model.b, model.n);
            return(View(model));
        }
        public ActionResult Simpson(Simpson_Model model)
        {
            Simpson resultado = new Simpson();

            model.ans     = new Answer_Model();
            model.ans.Res = resultado.Calcular(model.function, model.a, model.b, model.n);

            if (model.ans.Res[0] == 'L')
            {
                model.ans.status = 1;
            }
            else
            {
                model.ans.status = 2;
            }
            return(View(model));
        }