[R] & and |

[Henrik Bengtsson]

A version of Eric's answer is to use grepl(), which returns a logical vector:

mydata[grepl("ConfoMap", mydata) & grepl("GuineaPigs", mydata)]

with the OR analogue:

mydata[grepl("ConfoMap", mydata) | grepl("GuineaPigs", mydata)]

/Henrik

On Wed, Aug 19, 2020 at 8:24 AM Ivan Calandra <calandra using rgzm.de> wrote:
>
> Thank you Eric, I didn't think about intersect().
>
> Now I'm trying to do that in tidyverse with pipes, and I think that's
> too much for me for now!
>
> Ivan
>
> --
> Dr. Ivan Calandra
> TraCEr, laboratory for Traceology and Controlled Experiments
> MONREPOS Archaeological Research Centre and
> Museum for Human Behavioural Evolution
> Schloss Monrepos
> 56567 Neuwied, Germany
> +49 (0) 2631 9772-243
> https://www.researchgate.net/profile/Ivan_Calandra
>
> On 19/08/2020 17:17, Eric Berger wrote:
> > mydata[ intersect( grep("ConfoMap", mydata), grep("GuineaPigs",
> > mydata)  ) ]
> >
> >
> >
> > On Wed, Aug 19, 2020 at 6:13 PM Bert Gunter <bgunter.4567 using gmail.com
> > <mailto:bgunter.4567 using gmail.com>> wrote:
> >
> >     "&" is not a regex metacharacter.
> >     See ?regexp
> >
> >     Bert Gunter
> >
> >     "The trouble with having an open mind is that people keep coming
> >     along and
> >     sticking things into it."
> >     -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >
> >
> >     On Wed, Aug 19, 2020 at 7:53 AM Ivan Calandra <calandra using rgzm.de
> >     <mailto:calandra using rgzm.de>> wrote:
> >
> >     > Dear useRs,
> >     >
> >     > I feel really stupid, but I cannot understand why "&" doesn't
> >     work as I
> >     > expect, while "|" does.
> >     >
> >     > I have the following vector:
> >     > mydata <- c("SSFA-ConfoMap_GuineaPigs_NMPfilled.csv",
> >     > "SSFA-ConfoMap_Lithics_NMPfilled.csv",
> >     > "SSFA-ConfoMap_Sheeps_NMPfilled.csv",
> >     "SSFA-Toothfrax_GuineaPigs.xlsx",
> >     > "SSFA-Toothfrax_Lithics.xlsx", "SSFA-Toothfrax_Sheeps.xlsx")
> >     > and I want to find the values that include both "ConfoMap" and
> >     > "GuineaPigs".
> >     >
> >     > If I do:
> >     > grep("ConfoMap&GuineaPigs", mydata, value=TRUE)
> >     > it returns an empty vector, character(0).
> >     >
> >     > But if I do:
> >     > grep("ConfoMap|GuineaPigs", mydata, value=TRUE)
> >     > it returns all the elements that include either "ConfoMap" or
> >     > "GuineaPigs", as I would expect.
> >     >
> >     > So what is wrong with my "&" construct? How can I return the
> >     elements
> >     > that include both parts?
> >     >
> >     > Thank you for your help!
> >     > Ivan
> >     >
> >     > --
> >     > Dr. Ivan Calandra
> >     > TraCEr, laboratory for Traceology and Controlled Experiments
> >     > MONREPOS Archaeological Research Centre and
> >     > Museum for Human Behavioural Evolution
> >     > Schloss Monrepos
> >     > 56567 Neuwied, Germany
> >     > +49 (0) 2631 9772-243
> >     > https://www.researchgate.net/profile/Ivan_Calandra
> >     >
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> >
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