Dear Gabor Grothendieck,
thank you for your comments. Ive already tried that. but I've got this error message. > Reduce("+",z) Error in f(init, x[[i]]) : non-numeric argument to binary operator anyway, thanks ps. > is.matrix(z[[1]][[1]]) [1] TRUE I guess the reason "Reduce" doesn't work is that it has multi-dimentional list.. Gabor Grothendieck wrote: > > See this: > > https://stat.ethz.ch/pipermail/r-help/2009-August/208002.html > > On Sat, Aug 22, 2009 at 11:41 AM, kathie<kathryn.lord2...@gmail.com> > wrote: >> >> Dear R users, >> >> I have the list as follows; >> >> #------------------------------------------------------ >> >>> z >> >> [[1]] >> [[1]][[1]] >> >> matrix(A) >> >> [[1]][[2]] >> >> matrix(B) >> >> [[1]][[3]] >> >> matrix(C) >> >> [[2]] >> [[2]][[1]] >> >> matrix(D) >> >> [[2]][[2]] >> >> matrix(E) >> >> [[2]][[3]] >> >> matrix(F) >> >> #--------------------------------------------- >> >> I'd like to compute >> >> matrix(A)+matrix(B)+matrix(C)+matrix(D)+matrix(E)+matrix(F) >> >> >> In fact, I tried "lapply", "do.call" etc, but failed. >> >> >> >> Any suggestion will be greatly appreciated. >> >> Regards, >> >> Kathryn Lord >> >> -- >> View this message in context: >> http://www.nabble.com/computation-of-matrices-in-list-of-list-tp25094875p25094875.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. > > -- View this message in context: http://www.nabble.com/computation-of-matrices-in-list-of-list-tp25094875p25095627.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.