R中多列的均值 [英] Mean of Multiple Columns in R

问题描述

我正在尝试使用R中列的平均值，并且遇到了问题.假设我有:

I am trying take the mean of a list of columns in R and am running into a issue. Let's say I have:

A B  C  D
1 2  3  4
5 6  7  8
9 10 11 12

我想做的是取列c(A，C)的均值并将其另存为值(E)以及列c(B，D)的均值并将其另存为a F表示不同的值.这可能吗?

What I am trying to do is take the mean of columns c(A,C) and save it as a value say (E) as well as the mean of columns c(B,D) and have it save as a different value say F. Is that possible?

E   F
2   3
6   7
10  11

推荐答案

签出dplyr:

library(dplyr)
df <- df %>% mutate(E=(A+C)/2, F=(B+D)/2)
df

  A  B  C  D  E  F
1 1  2  3  4  2  3
2 5  6  7  8  6  7
3 9 10 11 12 10 11

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