﻿功能:求同纬度数据样本数据协方差

格式:DataCov(x, y)

x : 一个样本数据矩阵
y : 与x同纬度的样本数据矩阵

说明: 本函数执行完毕返回x和y的协方差值

例子:

a =
[ 4.000000000000000   5.000000000000000
  7.000000000000000   8.000000000000000
  6.000000000000000   9.000000000000000 ]

b =
[ 3.000000000000000   6.000000000000000
  15.00000000000000   -6.00000000000000
  8.000000000000000   6.000000000000000 ]

c =
[ 4.000000000000000   6.000000000000000
  3.000000000000000   21.00000000000000
  10.00000000000000   5.000000000000000 ]

c = DataCov(a,b)//回车得到如下结果
c =
[-1.40000000000000 ]