[R] How to shade vertical bands in a graph?

[John Kane]

?rect
Something like this should work but I did not take the
time to get the rectangles to fit properly.

aa <- rnorm(25)
yl <- -1.5
yh <- 2.2
xleft <- c(4, 9, 15 ,20)
xright  <-  xleft + 3
plot(aa, ylim= c(yl,yh), type="n")
rect(xleft, yl, xright,yh, col="yellow")
points(aa, col="red")


--- del pes <cgdelnet at hotmail.com> wrote:

> 
> Hello,
> 
> I would like to draw vertical yellow bands in my
> graph, but could not find how to do that in the
> documentation.
> 
> I set up a page to show what I would like to
> achieve: http://rstudent.blogg.de/eintrag.php?id=1
> (the first picture was manually colored with the
> Gimp).
> 
> Any help would be welcome...
> 
> All the best,
> 
> Delfina
>
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