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.