Claus Hindsgaul wrote:
> Thank you all!
> Paste() was just the function I needed to know!
Or sprintf:
> s1 <- "R-"
> s2 <- "project"
> sprintf("%s%s",s1,s2)
[1] "R-project"
It seems to be much faster:
> unix.time(for(i in 1:100000){junk=sprintf("%s%s",s1,s2)})
[1] 1.12 0.00 1.12 0.00 0.00
> unix.time(for(i in 1:100000){junk=paste(s1,s2,sep='')})
[1] 5.90 0.01 5.92 0.00 0.00
Not that I imagine string concatenation will ever be a bottleneck
worth optimising but there it is. A well-constructed sprintf() call may
be more readable than a pastey mess though, with all its fiddly commas
and quotes - contrived example:
> sprintf("%s://%s%s/%s",scheme,host,dir,file)
[1] "http://www.foo.com/foo/bar/baz.txt";
> paste(scheme,'://',host,dir,'/',file,sep='')
[1] "http://www.foo.com/foo/bar/baz.txt";
which do you prefer?
Barry
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
