Sys.Math.Mean.h

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程式碼

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#pragma once
 
#include <math.h>
#include <vector>
 
namespace Sys.Math {
 
template <typename Type>
class Mean
{
public:
	typedef std::vector<Type>::iterator iterator;
 
	public inline Type ArithmeticMean(std::vector<Type> num)
	{
		Type temp = (Type)0;
		for (iterator iter = num.begin(); iter < num.end(); iter++ )
		    temp += *iter;
 
		return (temp / num.size());
	}
 
	public inline Type GeometricMean(std::vector<Type> num)
	{
		Type temp = (Type)1;
		for (iterator iter = num.begin(); iter < num.end(); iter++ )
			temp *= *iter;
 
		return (::pow(temp,  (1.0 / num.size())));
	}
 
 
	public inline Type HarmonicMean(std::vector<Type> num)
	{
		TYPE temp = (Type)0;
		for (iterator iter = num.begin(); iter < num.end(); iter++ )
			temp += ( 1.0 / *iter);
 
		return ((Type)num.size() / temp);
	}
 
	public inline Type RootMeanSquare(std::vector<TYPE> num)
	{
		Type temp = (Type)0;
		for (iterator iter = num.begin(); iter < num.end(); iter++ )
			temp +=  ::pow( *iter, 2.0);
 
		return ((Type)::pow( (temp / num.size()), 0.5);
	}
 
/* 以後再寫... 	
	public static double HeronianMean(double a, double b)
	{
		double result = (Math.pow((a * b), 0.5) + a + b) / 3.0;
		return result;
	}
 
*/
}
 
}