[R] RegExp question

[Andrej]

Thanks Romain, works like a charm!
Thanks David!

Best, Andrej

On Jun 16, 10:15 pm, Romain Francois <romain.franc... at dbmail.com>
wrote:
> Le 16/06/10 18:54, Andrej a écrit :
>
>
>
> > Thanks David for your fast reply, but now I realized tat "string" is
> > of type:
>
> >> class(string)
> > [1] "jobjRef"
> > attr(,"package")
> > [1] "rJava"
>
> > so I get an error when i try with gsub or sub:
>
> >> sub("^.+\\t(\\d+)\\n.+$", "\\1", string)
> > Error in as.character.default(x) :
> >    no method for coercing this S4 class to a vector
>
> "string" is a java object, you can get the character vector like this:
>
>  > string$toString()
>
> but I bet there are other methods in the java class that would let you
> access the information you are after without doing text demangling. Try
> completion:
>
>  > string$<TAB>
>
> replace <TAB> by the tab key, you should see the list of java methods
> associated with the java class. you can also call .jmethods
>
>  > .jmethods( string )
>
> Romain
>
>
>
> > I think that there should be trivial solution, but... Any further
> > idea?
>
> > Regards, Andrej
>
> > On Jun 16, 6:47 pm, David Winsemius<dwinsem... at comcast.net>  wrote:
> >> On Jun 16, 2010, at 12:04 PM, Andrej wrote:
>
> >>> Dear all,
>
> >>> I'm trying to filter out the "number of leaves" (it should be 1 in the
> >>> example below) from the following string:
>
> >>>> string
> >>> [1] "Java-Object{J48 pruned tree\n------------------\n: 0 (15.0/3.0)\n
> >>> \nNumber of Leaves  : \t1\n\nSize of the tree : \t1\n}"
>
> >>> Any idea how to do that as simple as possible? Thanks in advance for
> >>> any advice.
>
> >> ?sub   # or ?gsub if you need more than one pattern matched (they are
> >> on the same page).
>
> >> This should find the first occurrence of digits following a tab
> >> terminated by a line feed and then return only the digits:
>
> >> string<- "Java-Object{J48 pruned tree\n------------------\n: 0
> >> (15.0/3.0)\n \nNumber of Leaves  : \t1\n\nSize of the tree : \t1\n}"
> >> sub("^.+\\t(\\d+)\\n.+$", "\\1", string)
> >> [1] "1"
>
> >> The parens within the search pattern are matched to "\\1". Need to
> >> double backslashed within patterns.
>
> >>> Regards, Andrej
>
> >> --
>
> >> David Winsemius, MD
> >> West Hartford, CT
>
> --
> Romain Francois
> Professional R Enthusiast
> +33(0) 6 28 91 30 30http://romainfrancois.blog.free.fr
> |-http://bit.ly/98Uf7u: Rcpp 0.8.1
> |-http://bit.ly/c6YnCi: graph gallery collage
> `-http://bit.ly/bZ7ltC: inline 0.3.5
>
> ______________________________________________
> R-h... at r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.