Dear Robin: it works
with many thanks steve On Wed, Nov 25, 2015 at 12:44 PM, Donatello, Robin <[email protected]> wrote: > Use the polygon() function where x and y are the vertices of the area you > want shaded. > > polygon(x=c(0,10,10,0),c(3,3,7,7),col=adjustcolor("gray", alpha.f=.5)) > polygon(x=c(5,7,7,5),c(0,0,10,10),col=adjustcolor("blue", alpha.f=.5)) > > > Robin Donatello, DrPH > Assistant Professor > Department of Mathematics and Statistics > California State University Chico > Holt 216 > 530-898-5767 > [email protected] > www.norcalbiostat.com > > ________________________________________ > From: R-sig-teaching <[email protected]> on behalf of > Steven Stoline <[email protected]> > Sent: Wednesday, November 25, 2015 9:34 AM > To: R-sig-teaching > Subject: [R-sig-teaching] Shading Area > > Dear All: > > > How to shade the area between the lines y = 3 and y = 7 (with gray color > (say), and between the lines x = 5 and x = 7? with color light blue (say). > > > > *here is the R code:* > ==================== > > > > plot(0:10, 0:10, type = "n", xaxt = "n", yaxs = "i", xaxs = "i", yaxt = > "n", xlab = "", ylab = "") > > > text(10.15, 0, "x", pos = 4, xpd = NA, cex = 1.25) > > text(0, 11.00, "y", pos = 1.85, xpd = NA, cex = 1.25) > > > > abline(h=3.0, col="red", lwd=1.5) > abline(h=7, col="red", lwd=1.5) > > > abline(v=5.0, col="gray", lwd=2.0) > abline(v=7, col="gray", lwd=2.0) > > > segments(0,5, 6,5, lty=2, lwd=2.0) > segments(6,0, 6,5, lty=2, lwd=2.0) > > > with thanks > steve > > ------------------------- > Steven M. Stoline > 1123 Forest Avenue > Portland, ME 04112 > [email protected] > > [[alternative HTML version deleted]] > > _______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-sig-teaching > -- Steven M. Stoline 1123 Forest Avenue Portland, ME 04112 [email protected] [[alternative HTML version deleted]] _______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-teaching
