重命名R中的一个命名列 [英] Rename one named column in R

问题描述

我想更新数据框架的一列，使用其原始名称来引用它，这是否可能？例如，我有表'data'

I want to update one column of a dataframe, referencing it using its original name, is this possible? For example say I had the table 'data'

a b c  
1 2 2  
3 2 3  
4 1 2

，我想将列b的名称更新为'd'。我知道我可以使用

and I wanted to update the name of column b to 'd'. I know I could use

colnames(data)[2] <- 'd'  

但我可以通过特别引用b来进行更改，例如

but can I make the change by specifically referencing b, i.e. something like

colnames(data)['b'] <- 'd'  

这样，如果数据框架的列顺序改变，正确的列名称仍会更新。

so that if the column ordering of the dataframe changes the correct column name will still be updated.

提前感谢

推荐答案

这看起来像是一个黑客，但第一件事是想到使用 grepl（）足够详细的搜索字符串，只得到你想要的列。我确定有更好的选择：

This seems like a hack, but the first thing that came to mind was to use grepl() with a sufficiently detailed enough search string to only get the column you want. I'm sure there are better options:

dat <- data.frame(a = 1:3, b = 1:3, c = 1:3)
colnames(dat)[grepl("b", colnames(dat))] <- "foo"
dat
#------
  a foo c
1 1   1 1
2 2   2 2
3 3   3 3

正如Joran在下面指出的，我过于复杂的东西...不需要一个正则表达式。

As Joran points out below, I overcomplicated things...no need for a regex at all. This saves a few characters on the typing too.

colnames(dat)[colnames(dat) == "foo"] <- "bar"
#------
  a bar c
1 1   1 1
2 2   2 2
3 3   3 3

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