[R] inverse of which()

[Jeff Newmiller]

use grepl?

On February 27, 2019 3:03:27 PM PST, Ed Siefker <ebs15242 using gmail.com> wrote:
>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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-- 
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