You need to learn about proper subsetting, and the names() function. Consider
the following:
R > d <- data.frame(alpha=1:3, beta=4:6, gamma=7:9)
R > d
alpha beta gamma
1 1 4 7
2 2 5 8
3 3 6 9
R > names(d)
[1] "alpha" "beta" "gamma"
R > names(d) == "beta"
[1] FALSE TRUE FALSE
R > names(d)[names(d) == "beta"] <- "two"
R > d
alpha two gamma
1 1 4 7
2 2 5 8
3 3 6 9
R > names(d)[3] <- "three"
R > d
alpha two three
1 1 4 7
2 2 5 8
3 3 6 9
B.
(I can't even ...)
On May 2, 2016, at 1:27 PM, jpm miao <miao...@gmail.com> wrote:
> Hi,
>
> Could someone suggest a way to rename a data frame column? For example,
> I want to rename the column beta, but I can't do it this way
>
>> d <- data.frame(alpha=1:3, beta=4:6, gamma=7:9)
>> mm<-"beta"
>> rename(d, c(mm="two", "gamma"="three"))
> The following `from` values were not present in `x`: mm
> alpha beta three
> 1 1 4 7
> 2 2 5 8
> 3 3 6 9
>
> ********
> Of course this would work
>
>> rename(d, c("beta"="two", "gamma"="three"))
> alpha two three
> 1 1 4 7
> 2 2 5 8
> 3 3 6 9
>
> [[alternative HTML version deleted]]
>
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