How about %in% ?
# preparing something that looks like I think your data looks like:
ap <- c("aajkss", "dfghjk", "sdfghk", "xxcvvn")
af <- matrix(1:10, nrow=2)
colnames(af) <- c("aajkss", "b", "c", "dfghjk", "e")
# doing what I think you need done:
ap[ap %in% colnames(af)]
Cheers,
B.
(PS. a reproducible example saves us all time and unnecessary effort. :-)
On May 8, 2015, at 3:50 PM, Kate Ignatius <[email protected]> wrote:
> Hi,
>
> I have a list of 150 strings, say, ap,:
>
> aajkss
> dfghjk
> sdfghk
> ...
> xxcvvn
>
>
> And I would l like to grep out these strings from column names in
> another file, af,. I've tried the following but none seem to work:
>
> aps <- af[,grep(ap, colnames(af), value=TRUE)]
> aps <- af[,grep(ap, colnames(af), value=FIXED)]
> aps <- af[,grep(as.character(list(ap),colnames(af))]
>
> and also aps <- unique (grep(ap, colnames(af))
>
> Is there another way I can do this - maybe without using grep?
>
> Thanks!
>
> Kate.
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
[email protected] mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
