Many thanks David :-) I think I got that idea :-) On Sat, Jan 31, 2009 at 2:16 PM, David Winsemius <dwinsem...@comcast.net>wrote:
> Several ways, two are shown: > > matrix(1:(4*7), 4,7) > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 1 5 9 13 17 21 25 > [2,] 2 6 10 14 18 22 26 > [3,] 3 7 11 15 19 23 27 > [4,] 4 8 12 16 20 24 28 > > mtx <- matrix(1:(4*7), 4,7) > > > mtx[-1,] > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 2 6 10 14 18 22 26 > [2,] 3 7 11 15 19 23 27 > [3,] 4 8 12 16 20 24 28 > > mtx[2:4, ] > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] 2 6 10 14 18 22 26 > [2,] 3 7 11 15 19 23 27 > [3,] 4 8 12 16 20 24 28 > > Search terms: > --- at the R prompt > ?Extract > ?"[" #gets to the same page > > --- in other sites: > indexing > > -- David Winsemius > > > On Jan 31, 2009, at 8:25 AM, Rofizah Mohammad wrote: > > Hello, >> >> How do I get sub-matrix? Example, I would like to get matrix of size 3x7 >> from the matrix of size 4x7. Meaning that I try to exclude one row of the >> original matrix. >> >> Thanks >> -rofizah- >> >> [[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<http://www.r-project.org/posting-guide.html> >> and provide commented, minimal, self-contained, reproducible code. >> > > [[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.
