Try this:

#1
gsub(".*-", "", zzz)

#2
gsub("-.*", "", zzz)


On Mon, Aug 10, 2009 at 1:56 PM, James Perkins
<jperkins@biochem.ucl.ac.uk>wrote:

> Dear all,
>
> I am trying to split a matrix into 2 as efficiently as possible.
>
> It is a character matrix:
>
>  1       2       3     1 "2-271" "2-367" "1-79"
> 2 "2-282" "2-378" "1-90"
> 3 "2-281" "2-377" "1-89"
>
> I want to make 2 matrices from this, as succinctly and efficiently as
> possible.
>
> I've tried such things as sapply(matrix, strsplit, "-") and tried to go
> from there, but I can't figure it out! So far I do it with a 2D for loop
> which can't be efficient!
>
> firstPartM <- matrix(ncol= dim(zzz)[2], nrow= dim(zzz)[1])
> secondPartM <- matrix(ncol= dim(zzz)[2], nrow= dim(zzz)[1])
> for(i in 1:dim(zzz)[1]) {
>  for(j in 1:dim(zzz)[2]) {
>    splitS <- strsplit(zzz[i,j],"-")
>    firstPartM[i,j] <- splitS[[1]][1]
>    secondPartM[i,j] <- splitS[[1]][2]
>  }
> }
>
> Cheers,
>
> Jim
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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