[R] inverse of which()

[Ed Siefker]

That's exactly what I want! Thanks!
-Ed

On Wed, Feb 27, 2019 at 5:14 PM David L Carlson <dcarlson using tamu.edu> wrote:
>
> I'm not sure I completely understand your question. Would using grepl() instead of grep() let you do what you want?
>
> ----------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77843-4352
>
> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Ed Siefker
> Sent: Wednesday, February 27, 2019 5:03 PM
> To: r-help <r-help using r-project.org>
> Subject: [R] inverse of which()
>
> Given a vector of booleans, chich() will return indices that are TRUE.
>
> Given a vector of indices, how can I get a vector of booleans?
>
> My intent is to do logical operations on the output of grep().  Maybe
> there's a better way to do this?
>
> Thanks
> -Ed
>
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