Here are a couple of ways using base graphics: > library(TeachingDemos) > x <- y <- seq(0,1,length.out=100) > tmp <- expand.grid(x=x,y=y) > z <- matrix( tmp$x + tmp$y, 100 ) > > plot( 0:1, 0:1, type='n', xlab='x', ylab='y' ) > subplot( image(x,y,z, col=topo.colors(100), axes=FALSE, xlab='', ylab=''), + c(0.2,0.4), c(0.2,0.7) ) > > clipplot( image(x,y,z, col=topo.colors(100), add=TRUE), + c(0.7,0.9), c(0.3,0.8) ) >
In version 2.7 there is also the option to use the clip function (instead of clipplot in TeachingDemos) like: > clip( 0.3, 0.8, 0.9, 1.0 ) > image(x,y,z, col=topo.colors(100), add=TRUE) However the help for "clip" notes that it can be hard to predict when the clipping region will be reset, so this sometimes works (my tests had it work if I did the above 2 lines after the subplot example) and sometimes does not (my tests did not work when used after the clipplot example, or on a new plot). Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of tom soyer > Sent: Tuesday, April 08, 2008 12:24 PM > To: r-help@r-project.org > Subject: [R] diagonally fill a rectangle with color gradient > > Hi, > > Is it possible to diagonally fill a rectangle with a color > gradient? I noticed that the gradient.rect of plotrix could > fill a rect either up and down or from side to side. I am > looking for something similar but fills diagonally instead, > e.g., from the upper left corner to the bottom right. > Does anyone know how to do it in R? > > Thanks, > > -- > Tom > > [[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. > ______________________________________________ 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.
