WingAIDiagnosisService/Carotid/MathTools/MathToolsBasis.cs

using System;
using System.Linq;

namespace WingAIDiagnosisService.Carotid.MathTools
{
    public class MathToolsBasis
    {
        //精度要求
        public static float Precision = 0.0001f;
        //精度要求
        public static float NegPrecision = -0.0001f;

        /// <summary>
        /// Get min pow of two for the input value.
        /// </summary>
        /// <param name="inputValue">input value</param>
        /// <returns>Min power of two.</returns>
        public static int GetMinPowOfTwo(int inputValue)
        {
            for (var i = 4; i < int.MaxValue; i++)
            {
                var sum = (int)Math.Pow(2, i);
                if (sum >= inputValue)
                {
                    return sum;
                }
            }
            return 64;
        }

        /// <summary>
        /// 判断两个double是否相等
        /// </summary>
        /// <param name="d1"></param>
        /// <param name="d2"></param>
        /// <returns></returns>
        public static bool TwoDoubleEqual(double d1, double d2)
        {
            return Math.Abs(d1 - d2) < Precision;
        }

        /// <summary>
        /// double四舍五入转int
        /// </summary>
        /// <param name="d"></param>
        /// <returns></returns>
        public static int DoubleToInt(double d)
        {
            return (int)Math.Round(d);
        }

        /// <summary>
        /// 向上取整
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static int GetUpperInt(double value)
        {
            return (int)Math.Ceiling(value);
        }

        /// <summary>
        /// 向下取整
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static int GetLowerInt(double value)
        {
            return (int)Math.Floor(value);
        }

        /// <summary>
        /// 弧度转角度
        /// </summary>
        /// <param name="radian"></param>
        /// <returns></returns>
        public static double ChangeRadianToAngle(double radian)
        {
            return radian / 2 / Math.PI * 360;
        }

        /// <summary>
        /// 计算一系列数据的标准差
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static float GetStandardDeviation(int[] data)
        {
            if (data.Length> 0)
            {
                //  计算平均数   
                var avg = data.Average();
                //  计算各数值与平均数的差值的平方，然后求和  
                var sum = data.Sum(d => Math.Pow(d - avg, 2));
                //  除以数量，然后开方 
                return (float)Math.Sqrt(sum /data.Length);
            }
            return 0;
        }

    }
}