[R] how to rename variables by lopping off first 3 characters

[Stefan Schreiber]

This should work (couldn't check - not at my computer right now):

my_df %<% rename_at(vars(starts_with("i..")), funs(str_replace(., "i..",
"")))

There are also a lot of tutorials on the internet. Google something like
"rename_at str_replace"

HTH,
Stefan

On Mon, Mar 14, 2022, 10:27 Christopher W Ryan via R-help, <
r-help using r-project.org> wrote:

> I have data coming to me from another source, in which some of the variable
> names begin with "i.."
>
> As in "i..actual_meaningful_var_name"
>
> I would like to remove the first three characters from any variable name if
> they are "i.."
>
> I'm using R on Win 10 and dplyr, so ideally I'm looking for a dplyr
> solution. Apparently I'm just not understanding how the various select,
> contains, rename_at, rename_with, and so-on dplyr expressions work. I've
> tried various arrangements of them, usually resulting in
>
> Error: `contains()` must be used within a *selecting* function.
> i See <https://tidyselect.r-lib.org/reference/faq-selection-context.html>
>
> A simple select(contains(foo)) I can do fine, to select a subset of
> variables. It's combining it with renaming that I am struggling with.
>
> Grateful for any advice.
>
> Thanks.
>
> --Chris Ryan
>
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>
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