I think that if you want to apply a simple calculation
to each element something like
df[,3:7] <- df[,3:7] + 10
would do what you want.
--- DEEPANKAR BASU <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> I have a data frame with a group of variables named
> b1, b2, b3, ..., b18. These variables take the value
> 1, 2 or NA. For each observation, I want to do some
> computation by looping over the values for the group
> of variables: b1 to b18. In STATA I would do:
>
> forval i=1/18 {
> --- use b`i' for computation ----
> }
>
> How can this be done in R?
>
> Deepankar
>
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