我正在玩一个非常简单的程序,采取一系列的双打,并返回标准偏差.这部分工作,但我想使代码更可重用.我想这样做,所以该方法可以接受任何可以被认为是数字的类型的参数,并返回标准偏差,而不是硬编码双重类型(像我最初在这个程序中).一个人如何去做,这是什么适当的术语？
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication5
{
class Program
{
static void Main(string[] args)
{
double[] avg = { 3.4,55.6,10.0,4.5,2,2 };
double x = avg.Average();
//first round of testing
Console.WriteLine("The average of the first array is below ");
Console.WriteLine(x);
Console.WriteLine("below should be the standard deviation!");
Console.WriteLine(CalculateStandardDeviation(avg));
Console.ReadLine();
int[] intAvg = { 4,3,5,6,2 };
double secondAvg = intAvg.Average();
Console.WriteLine("The average of the second array is below ");
Console.WriteLine(secondAvg);
//this is where the error is happening
//CalculateStandardDeviation(secondAvg);
}
//this is where I tried to make the query more reusable
public static double CalculateStandardDeviation(IEnumerable<double> values)
{
double avg = values.Average();
double sum = 0;
foreach (double d in values)
{
sum += Math.Pow((d - avg),2);
}
return Math.Pow(sum / (values.Count() - 1),.5);
}
}
}
解决方法
你可以使用这样的东西：
public static decimal CalculateStandardDeviation<T>(IEnumerable<T> values)
{
IEnumerable<decimal> decimalValues = values.Select(v => Convert.ToDecimal(v));
decimal result = 0;
// calculate standard deviation on decimalValues
return result;
}
如果值包含不能转换为小数的值,它将抛出一个异常,但是如果值是适当的类型,那么它将会起作用,我认为这是完全正确的.
