[R] assign

Georges Monette georges.monette at gmail.com
Sat Apr 9 21:04:29 CEST 2016


Hi,

I couldn't resist these two suggestions:

strings <- c("ASk/20005-01-45/90", "Alldatk/25-17-4567/990")

x <- as.numeric(gsub("^[^-]*-|-.*$","",strings))

or

x <- as.numeric(sub("^[^-]*-([0-9]+)-.*$","\\1",strings))

Best,
Georges

---------------------
Georges Monette, York University, Toronto

On 08/04/2016 10:53 PM, Fox, John wrote:
> Dear Val,
>
> Your question isn't entirely clear (to me), but this is what I think you want to do:
>
> ------------------ snip ----------------
>
>> strings <- c("ASk/20005-01-45/90", "Alldatk/25-17-4567/990")
>> location <- regexpr("-[0-9]*", strings)
>> x
> [1] "01" "17"
>> x <- substring(strings, location + 1, location + attr(location, "match.length") - 1)
>> as.numeric(x)
> [1]  1 17
>
> ------------------ snip ----------------
>
> I hope this helps,
>   John
>
> -----------------------------
> John Fox, Professor
> McMaster University
> Hamilton, Ontario
> Canada L8S 4M4
> web: socserv.mcmaster.ca/jfox
>
>
> ________________________________________
> From: R-help [r-help-bounces at r-project.org] on behalf of Val [valkremk at gmail.com]
> Sent: April 8, 2016 10:21 PM
> To: r-help at R-project.org (r-help at r-project.org)
> Subject: [R] assign
>
> Hi all
>   I am trying t extract  a variable from a column
>
>        ASk/20005-01-45/90
>
>       Alldatk/25-17-4567/990
>
> I want to assign  a variable to the numbers coming the first"-"
>
> x=01 for the first and
> x=17  for teh second
>
> I tried using gsub but did not work
>
> x=gsub("-")
>
> any help?
>
>          [[alternative HTML version deleted]]
>
> ______________________________________________
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>
> ______________________________________________
> R-help at r-project.org 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.



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