Do you mean replace values of a column?
> df <- data.frame("Jan" = 1:3,"Feb" = 11:13)
> df
Jan Feb
1 1 11
2 2 12
3 3 13
> df$Jan <- 21:23
> df
Jan Feb
1 21 11
2 22 12
3 23 13
-----
A R learner.
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