Shading Area

Dear Robin:

it works

with many thanks
steve

On Wed, Nov 25, 2015 at 12:44 PM, Donatello, Robin <rdonatello at csuchico.edu>
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
rdonatello at csuchico.edu
www.norcalbiostat.com

________________________________________
From: R-sig-teaching <r-sig-teaching-bounces at r-project.org> on behalf of
Steven Stoline <sstoline at gmail.com>
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
sstoline at gmail.com

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Steven M. Stoline
1123 Forest Avenue
Portland, ME 04112
sstoline at gmail.com

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