Hi Murali, So, the solution to your problem will be to explicitly convert your matrix to a numeric matrix. Maybe matrix (?matrix) will do, or you'll also have to use as.numeric (?as.numeric). The strings on the left seem to me to be the row labels, right..?, not elements in the matrix/table.
As a newbie, the thing you probably have to get used to/read up with is the distinction between tables, which can contain any sort of data and can not always be used in matrix calculations and (numeric) matrices/vectors. Cheers, Tsjerk On Fri, Jul 18, 2008 at 3:47 AM, Murali K <[EMAIL PROTECTED]> wrote: > Hello, > I am a newcomer to R and therefore apologize for posting such a > basic question. I am > trying to multiply 2 matrices t(X1)%*%X1, where t(X1) is: > > > 1 2 3 4 5 8 12 13 20 24 26 27 31 33 34 36 37 40 41 42 45 46 > 47 48 49 > ones 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 > 1 1 1 1 1 > Shadow 0 1 1 1 1 1 1 1 0 1 1 1 1 0 1 0 1 0 1 1 > 0 1 0 1 0 > > However, when I try to perform this operation, I obtain: > Error in t(X1) %*% X1 : requires numeric matrix/vector arguments > > Can someone please tell me what I seem to be doing wrong? thanks. > > Sincerely, > Murali Kuchibhotla > > > Murali Kuchibhotla > Department of Economics > Iowa State University > Office:75,Heady > Phone:515-294-5452 > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > -- Tsjerk A. Wassenaar, Ph.D. Junior UD (post-doc) Biomolecular NMR, Bijvoet Center Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands P: +31-30-2539931 F: +31-30-2537623 ______________________________________________ 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.
