sapply(s,function(x) colMeans(x[,c("Ozone","Wind","Temp")]为什么写成sapply(s, colMeans(s[,c("Ozone","Wind","Temp")]就不行呢

源自：4-5 R语言函数 split

sapply(s,function(x) colMeans(x[,c("Ozone","Wind","Temp")]为什么写成sapply(s, colMeans(s[,c("Ozone","Wind","Temp")]就不行呢

sapply(s,function(x) colMeans(x[,c("Ozone","Wind","Temp")]为什么写成sapply(s, colMeans(s[,c("Ozone","Wind","Temp")]就不行呢

提问者：野猴子上山 2017-04-17 20:47

个回答

六弦琴

2017-04-18 00:31:28

已采纳

s是列表，x是s中的数据框。对于colmeans函数，只能作用与矩阵或者数据框

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