Ding, Rebecca wrote:
Dear R users,
I used the following code to draw a scatter plot.
plot(x,y,type=n)
points(x,y,pch=1)
And then I used the abline functions to draw two lines. I want to add
the shadow between those two lines.
abline(h=200)
abline(h=300)
Any suggestions?
Hi
Dear R users,
I used the following code to draw a scatter plot.
plot(x,y,type=n)
points(x,y,pch=1)
And then I used the abline functions to draw two lines. I want to add
the shadow between those two lines.
abline(h=200)
abline(h=300)
Any suggestions?
Thanks
Rebecca
see ?rect, or, for more general shapes, ?polygon
## EXAMPLES
plot(c(0,500),c(0,500),type=n,las=1)
rect(par(usr)[1],200,par(usr)[2],300,col=grey90)
points(seq(0,500,length=3),seq(0,500,length=3))
plot(c(0,500),c(0,500),type=n,las=1)
polygon((par(usr)[1:2])[c(1,1,2,2)],
