On Thu, 13-Aug-2009 at 04:24PM -0600, Mark Na wrote:
|> Hello,
|>
|> My dataframe has new columns that start with the number 1 or 2 (resulting
|> from a reshape cast command).
|>
|> Instead of having these columns automatically renamed by R so start with the
|> letter X, I would like to rename these columns to start with the characters
|> "SURV_" (e.g., SURV_1, SURV_2).
|>
|> I can't seen to use grep() to identify and rename the columns starting with
|> either 1 or 2.
|>
|> Any help would be much appreciated, thanks!
|>
|> (I know I could rename these manually, but the above is a simpler statement
|> of the actual problem, which involves several dozen columns, so that's why
|> I'd prefer not to so it manually)
Without knowing what your data looked liked before it was reshaped,
it's a bit hard to guess what would be a good way to avoid the
problem, but this might be a case where cure might be easier than
prevention.
If your dataframe has names like these:
> names(junk.df)
[1] "Fruit" "January" "February" "X1" "X2" "X3" "X4"
You can replace each incidence of "X" with "SURV_" this way:
> names(junk.df) <- gsub("X", "SURV_", names(junk.df))
> names(junk.df)
[1] "Fruit" "January" "February" "SURV_1" "SURV_2" "SURV_3" "SURV_4"
If there are other instances where "X" is a desirable part of the
name, it would be a bit trickier, but not much.
HTH
|>
|> Mark Na
|>
|> [[alternative HTML version deleted]]
|>
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