Regular expression patterns are not vectorized... only the data to be searched
are. Use one of the many websites dedicated to tutoring regular expressions to
learn how they work. (Using function names like "names" as data names is bad
practice.)
nms <- c( "x1.one", "x1.black", "x1.othrrace", "x1.moddkna", "x1.conserv",
"x1.nstrprty", "x1.strrep", "x1.sevngprt", "x2.one", "x2.black", "x2.othrrace",
"x2.moddkna", "x2.conserv", "x2.nstrprty", "x2.strrep", "x2.sevngprt" )
grep( "black|conserv", nms, value = TRUE )
On May 8, 2021 10:00:12 AM PDT, Steven Yen <st...@ntu.edu.tw> wrote:
>Below, the first command simply creates a list of 16 names (labels)
>which can be ignore.
>
>In the 2nd and 3rd commands, I am able to identify names containing
>"black".
>
>In line 4, I am trying to identify names containing "black" or
>"conserv"
>but obviously it does not work. Can someone help? Thanks.
>
> > names<-names(tp.nohs$estimate)[c(1:8,58:65)]; names
> [1] "x1.one" "x1.black" "x1.othrrace" "x1.moddkna"
>"x1.conserv" "x1.nstrprty"
> [7] "x1.strrep" "x1.sevngprt" "x2.one" "x2.black" "x2.othrrace"
>
>"x2.moddkna"
>[13] "x2.conserv" "x2.nstrprty" "x2.strrep" "x2.sevngprt"
> > grep("black",names,value=TRUE)
>[1] "x1.black" "x2.black"
> > grep("black",names,value=FALSE)
>[1] 2 10
> > grep(c("black","conserv"),names,value=TRUE)
>[1] "x1.black" "x2.black"
>Warning message:
>In grep(c("black", "conserv"), names, value = TRUE) :
> argument 'pattern' has length > 1 and only the first element will be
>used
>
>______________________________________________
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>PLEASE do read the posting guide
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>and provide commented, minimal, self-contained, reproducible code.
--
Sent from my phone. Please excuse my brevity.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
