r语言求平均值

Python025

r语言求平均值,第1张

vec = vector(length =1000)

for(i in 1:1000)

   vec[i] = UR_FUNC()

mean(vec)

data就是你的这个表

日期格式为：YYYYmmdd

library(plyr)

result <- ddply(data,.(month = substr(date,5,6)),summarize,ma = mean(a),

mb = mean(b),

mc = mean(c))