[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?

Thanks
-Ed

______________________________________________
R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.



More information about the R-help mailing list