On Tue, 2003-09-30 at 15:51, Jason Turner wrote: > (Ted Harding) wrote: > > > On 30-Sep-03 Rajarshi Guha wrote: > > > >>Hi, > >> I'm trying to take a set of rows and columns out of a matrix. I hve > >>been using the index aray approach. My overll matrix is X and is 179 x > >>65. I want to take out 4 columns and 161 rows. > ... > This is documented in "An Introduction to R", under the section "Arrays > and Matricies". There's lots of good stuff in there. From R: > > help.start() > > And click on "An Introduction to R". > > The short answer to this particular question: > a) negative indicies remove rows or columns. Since you only want to > remove 4 columns, I'd use that. > b) Since you only want to keep 18 rows, I'd use the numbers of the rows > you want to keep.
Thanks for all the answers. I had been writing loops and extracting elements - I've been spending too much time in C :-/ ------------------------------------------------------------------- Rajarshi Guha <[EMAIL PROTECTED]> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE ------------------------------------------------------------------- Build a system that even a fool can use and only a fool will want to use it. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help