[R] loop through columns in a data frame

[Bert Gunter]

"Does anyone know how to use loop (or other methods) to create new columns?
In SAS, I can use array to get it done. But I don't know how to do it in R."

Yup. Practically all users of R know how, as this is entirely elementary.
You will too if you make the effort to go through a basic R tutorial, of
which there are many on the web (and one shipped with R).

Cheers,
Bert

On Mon, Mar 25, 2019 at 10:08 AM Yuan, Keming (CDC/DDNID/NCIPC/DVP) via
R-help <r-help using r-project.org> wrote:

> Hi All,
>
> I have a data frame with variable names like A_le, A_me, B_le, B_me, C_le,
> C_me....
> if A_le=1 or A_me=1 then  I need to create a new column A_new=1. Same
> operation to create columns B_new, C_new...
> Does anyone know how to use loop (or other methods) to create new columns?
> In SAS, I can use array to get it done. But I don't know how to do it in R.
>
> Thanks,
>
> Keming Yuan
> CDC
>
>
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>
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