[R] inverse of which()

Ed Siefker eb@15242 @end|ng |rom gm@||@com
Thu Feb 28 00:03:27 CET 2019

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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