[R] inverse of which()

David L Carlson dc@r|@on @end|ng |rom t@mu@edu
Thu Feb 28 00:14:48 CET 2019

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?


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