[R] Can't rename a data frame column

[jpm miao]

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

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