Roger.Bivand at nhh.no
Sat Aug 19 14:20:43 CEST 2006
On Sat, 19 Aug 2006, Charles Annis, P.E. wrote:
> Greetings, Amigos:
> I have been trying without success to convert a character string,
> > repeated.measures.columns
>  "3,6,10"
> into c(3,6,10) for subsequent use.
> as.numeric(repeated.measures.columns) doesn't work (likely because of the
>  NA
> Warning message:
> NAs introduced by coercion
> I've tried many things including
> strsplit(repeated.measures.columns, split = ",")
> which produces a list with only one element, viz:
>  "3" "6" "10"
> as.numeric() doesn't like that either.
repeated.measures.columns is a vector. Consider:
repeated.measures.columns <- c("3,6,10", "5,4,9")
lst <- strsplit(repeated.measures.columns, split = ",")
which is why strsplit() returns a list - one list component for each
repeated.measures.columns element. Just pick off the one you want with
as.numeric(strsplit(repeated.measures.columns, split = ",")[])
> Clearly: 1) I cannot be the first person to attempt this, and 2) I've made
> this WAY harder than it is.
> Would some kind soul please instruct me (and perhaps subsequent searchers)
> how to convert the elements of a string into numbers?
> Thank you.
> Charles Annis, P.E.
> Charles.Annis at StatisticalEngineering.com
> phone: 561-352-9699
> eFax: 614-455-3265
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no
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