I had this question a while back in trying to do image plots of sparse matrices and ended up using this:
image(x=1:p,y=-(n:1),t(z),axes=FALSE, col=col,xlab=xlab,ylab=ylab) axis(1,pretty(1:p)) axis(2,pretty(-(n:1)),labels=rev(pretty(1:n))) url: www.econ.uiuc.edu/~roger/my.html Roger Koenker email [EMAIL PROTECTED] Department of Economics vox: 217-333-4558 University of Illinois fax: 217-244-6678 Champaign, IL 61820 On Thu, 18 Sep 2003, Arni Magnusson wrote: > Creating a plot with reverse Y axis is easy enough with traditional > graphics: > > x <- 1:3 > > y <- 1:3 > > plot(y~x, ylim=c(3,1)) > +-----------+ > 1 | o | > | | > 2 | o | > | | > 3 | o | > +-----------+ > 1 2 3 > > But xyplot doesn't grasp my idea: > > xyplot(y~x, ylim=c(3,1)) > +-----------+ > 3 | o | > | | > 2 | o | > | | > 1 | o | > +-----------+ > 1 2 3 > > Does anyone know how the reverse Y axis can be rendered with xyplot(), > perhaps using a customized panel function? I have tried post-processing > the trellis object elements, but with no luck. I have also tried the > xyplot(-y~x) workaround, but I don't know how to display the customized > labels. > > Finally, I'm aware of the y<-ordered(y,rev(y)) workaround, but a solution > for the continuous case would be preferred. > > Thanks in advance, > Arni > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help