On Wed, 2010-10-27 at 13:17 -0200, Marcelo Lima wrote: > Hi, > > I would like to add a line on the diagonal of a covariance matrix, is there > a quick way to do it besides abline? > > Thanks!
What's wrong with abline()? It does exactly what you want. By the way, reproducible example such as requested by David would something like: cmat <- matrix(rnorm(100), ncol = 10) diag(cmat) <- 1 contour(1:10, 1:10, cmat) abline(11, -1, col = "red", lwd = 2) box() I.e. some code with example data that shows us what you are trying to do. It is not always possible to grep the meaning from a textual description sufficiently well to be able to move from there to code. This is discussed in the posting guide. HTH G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.
