using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace BotSharp.Algorithm.HiddenMarkovModel.MathHelpers
{
    public class PolynomialHelper
    {
        /// <summary>
        ///   Evaluates polynomial of degree N
        /// </summary>
        /// 
        public static double Polevl(double x, double[] coef, int n)
        {
            double ans;

            ans = coef[0];

            for (int i = 1; i <= n; i++)
                ans = ans * x + coef[i];

            return ans;
        }

        /// <summary>
        ///   Evaluates polynomial of degree N with assumption that coef[N] = 1.0
        /// </summary>
        /// 
        public static double P1evl(double x, double[] coef, int n)
        {
            double ans;

            ans = x + coef[0];

            for (int i = 1; i < n; i++)
                ans = ans * x + coef[i];

            return ans;
        }
    }
}