Try str(ss) to see what it really looks like. You probably want: fn <- function(i) c(i, i^2)
On Sat, Nov 22, 2008 at 4:54 AM, megh <[EMAIL PROTECTED]> wrote: > > I need one more clarification here : > > Here I did : > > fn <- function(i) return(list(i, i^2)) > ss = sapply(1:4, fn) > > Here the object "ss" should be a matrix object : > is.matrix(ss) > > However I feel it lacks some the matrix object properties. For example the > syntax "min(ss[1,])" generates an error : > "Error in min(ss[1, ]) : invalid 'type' (list) of argument". > > What should be the way out? Am I missing something ? > > Regards, > > > baptiste auguie-2 wrote: >> >> Hi, >> >> you are feeding lapply "i" as an optional argument, which is passed to >> fn() and causes an error. Just use lapply(1:4, fn), or better yet, >> sapply, >> >> > fn <- function(i) return(i^2) >> > sapply(1:4, fn) >> [1] 1 4 9 16 >> >> Hope this helps, >> >> baptiste >> >> >> On 20 Nov 2008, at 16:31, megh wrote: >> >>> >>> I have written following codes, with intention to get a list with >>> values >>> 1,2,9,16 : >>> >>> fn <- function(i) return(i^2) >>> lapply(1:4, fn, i) >>> >>> However I got following error : >>> Error in FUN(1:4[[1L]], ...) : unused argument(s) (1) >>> >>> Can anyone please tell me what will be the correct code here? >>> >>> Regards, >>> >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/Error-with-lapply-tp20605066p20605066.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> 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. >> >> _____________________________ >> >> Baptiste AuguiƩ >> >> School of Physics >> University of Exeter >> Stocker Road, >> Exeter, Devon, >> EX4 4QL, UK >> >> Phone: +44 1392 264187 >> >> http://newton.ex.ac.uk/research/emag >> >> ______________________________________________ >> 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. >> >> > > -- > View this message in context: > http://www.nabble.com/Error-with-lapply-tp20605066p20634821.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > ______________________________________________ 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.