Hi Kathryn, take a look at the kronecker function.
Cheers Andrew On Thu, Jan 17, 2013 at 1:11 PM, Kathryn Lord <kathryn.lord2...@gmail.com>wrote: > Dear R users, > > I'd like to create a block diagonal matrix with each rows in a matrix. > > Here is a simple example. (In fact, the matrix is big) > > > x <- matrix(1:20, 4,5) > > > x > [,1] [,2] [,3] [,4] [,5] > [1,] 1 5 9 13 17 > [2,] 2 6 10 14 18 > [3,] 3 7 11 15 19 > [4,] 4 8 12 16 20 > > > With each rows in matrix x, I'd like to make the matrix below. > > > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9][,10] > [,11][,12][,13][,14][,15][,16][,17][,18][,19][,20] > [1,] 1 5 9 13 17 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 > [2,] 0 0 0 0 0 2 6 10 14 18 0 0 0 > 0 0 0 0 0 0 0 > [3,] 0 0 0 0 0 0 0 0 0 0 3 7 11 > 15 19 0 0 0 0 0 > [4,] 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 4 8 12 16 20 > > > Any suggestion will be greatly appreciated. > > Best, > > Kathryn Lord > > [[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. > -- Andrew Robinson Director (A/g), ACERA Senior Lecturer in Applied Statistics Tel: +61-3-8344-6410 Department of Mathematics and Statistics Fax: +61-3-8344 4599 University of Melbourne, VIC 3010 Australia Email: a.robin...@ms.unimelb.edu.au Website: http://www.ms.unimelb.edu.au FAwR: http://www.ms.unimelb.edu.au/~andrewpr/FAwR/ SPuR: http://www.ms.unimelb.edu.au/spuRs/ [[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.
