rowmeans():Use R!

>C1<-c(3,2,4,4,5)
> C2<-c(3,7,3,4,5)
> C3<-c(5,4,3,6,3)
> DF<-data.frame(ID=c("A","B","C","D","E"),
C1=C1,C2=C2,C3=C3)
> DF
  ID C1 C2 C3
1  A  3  3  5
2  B  2  7  4
3  C  4  3  3
4  D  4  4  6
5  E  5  5  3

计算每行的均值

> data.frame(ID=DF[,1], Means=rowMeans(DF[,-1]))
  ID    Means
1  A 3.666667
2  B 4.333333
3  C 3.333333
4  D 4.666667
5  E 4.333333

来源：https://stackoverflow.com/questions/10945703/calculate-row-means-on-subset-of-columns