David did help already, but if you want literally what the Introduction uses then you'll need a vector with as many elements as the final matrix (in David's example recyling applies to give 100 elements from the original 10).
z <- rep(0:9, each = 10) attr(z, "dim") <- c(10,10) That's simply a different route to the one shown by David, where the repetition of z values is made explicit. Cheers, Mike. On Fri, Nov 5, 2010 at 3:32 PM, Stephen Liu <sati...@yahoo.com> wrote: > Hi David, > > I'm learning R following the tutorial mentioned, nothing else. I got an error > running the code. Please help. > > B.R. > Stephen L > > > > > ----- Original Message ---- > From: David Winsemius <dwinsem...@comcast.net> > To: Stephen Liu <sati...@yahoo.com> > Cc: r-help@r-project.org > Sent: Fri, November 5, 2010 12:18:23 PM > Subject: Re: [R] setting attributes > > > On Nov 5, 2010, at 12:05 AM, Stephen Liu wrote: > >> Hi folks, >> >> An Introduction to R >> >> 3.3 Getting and setting attributes >> http://cran.r-project.org/doc/manuals/R-intro.html#Vectors-and-assignment >> >>> z <- 0:9 >>> z >> [1] 0 1 2 3 4 5 6 7 8 9 >> >>> attr(z, "dim") <- c(10,10) >> Error in attr(z, "dim") <- c(10, 10) : >> dims [product 100] do not match the length of object [10] >> >> Please help me to understand what mistake I committed? TIA > > If you want a 10 x 10 matrix then: > > zm <- matrix(z, 10, 10) # positional arguments to nrow and ncol. > > If you were trying for something else, then please explain in plain > English rather than simply showing code that throws an error. > > David Winsemius, MD > West Hartford, CT > > > > ______________________________________________ > 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. > -- Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsum...@gmail.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.
