Hi Mike, I got it done. Thanks
Your advice:- > z <- rep(0:9, each = 10) > z [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 0 1 2 3 4 5 6 7 8 9 [2,] 0 1 2 3 4 5 6 7 8 9 [3,] 0 1 2 3 4 5 6 7 8 9 [4,] 0 1 2 3 4 5 6 7 8 9 [5,] 0 1 2 3 4 5 6 7 8 9 [6,] 0 1 2 3 4 5 6 7 8 9 [7,] 0 1 2 3 4 5 6 7 8 9 [8,] 0 1 2 3 4 5 6 7 8 9 [9,] 0 1 2 3 4 5 6 7 8 9 [10,] 0 1 2 3 4 5 6 7 8 9 > attr(z, "dim") <- c(10,10) > attr function (x, which, exact = FALSE) .Primitive("attr") > attr(z, "dim") [1] 10 10 David's advice:- > z <- 0:9 > z <- matrix(z, 10, 10) > z [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 0 0 0 0 0 0 0 0 0 0 [2,] 1 1 1 1 1 1 1 1 1 1 [3,] 2 2 2 2 2 2 2 2 2 2 [4,] 3 3 3 3 3 3 3 3 3 3 [5,] 4 4 4 4 4 4 4 4 4 4 [6,] 5 5 5 5 5 5 5 5 5 5 [7,] 6 6 6 6 6 6 6 6 6 6 [8,] 7 7 7 7 7 7 7 7 7 7 [9,] 8 8 8 8 8 8 8 8 8 8 [10,] 9 9 9 9 9 9 9 9 9 9 > attr(z, "dim") <- c(10,10) > attr(z, "dim") [1] 10 10 > attr function (x, which, exact = FALSE) .Primitive("attr") The learning curve of R is rather steep at start. B.R. Stephen L ----- Original Message ---- From: Michael Sumner <mdsum...@gmail.com> To: Stephen Liu <sati...@yahoo.com> Cc: r-help@r-project.org Sent: Fri, November 5, 2010 12:44:08 PM Subject: Re: [R] setting attributes 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.