功能:编写的计算皮亚诺相关系数

开发语言:ruby

调用:correlate(x,y)

其中,x,y为需要计算相关度的向量



调用示例:

a = [3, 6, 9, 12, 15, 18, 21]

b = [1.1, 2.1, 3.4, 4.8, 5.6]

c = [1.9, 1.0, 3.9, 3.1, 6.9]

c1 = correlate(a,a) # 1.0

c2 = correlate(a,a.reverse) # -1.0

c3 = correlate(b,c) # 0.8221970228

puts c1#,c2,c3