[R] Logic operators...more than one??

Marc Schwartz m@rc_@chw@rtz @end|ng |rom me@com
Thu Oct 4 01:06:48 CEST 2018

> On Oct 3, 2018, at 7:03 PM, David Doyle <kydaviddoyle using gmail.com> wrote:
> I'm sure this is a simple question but I'm not sure where to find the
> answer.
> I want to remove some of the data.  For example when my Location column is
> MW-09, MW-10, or MW-11.
> It works fine if I ONLY list ONE of the locations as in:
> SampledWells <- MyData[ MyData$Location != "MW-09", ]
> But if I try to do more than one (as shown below), I don't get an error but
> I also don't get my SampledWells
> SampledWells <- MyData[ MyData$Location != "MW-09", "MW-10", ]
> Thoughts??
> Thank you for your time
> David


See ?"%in%"


  SampledWells <- MyData[ !MyData$Location %in% c("MW-09", "MW-10"), ]

Note the '!' operator that precedes the expression to negate the logical.


Marc Schwartz

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