[R] & and |

[Ivan Calandra]

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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