[R] fill in area between 2 lines with a color

David Freedman 3.14david at gmail.com
Sun Jul 20 18:34:37 CEST 2008

Hi - I'd like to have the area between 2 lines on a x-y plot be filled with
grey, but I haven't had
any luck using polygon or rect.  (In reality, I'd like to do this for twice
- once for a low group and once for a high group - and then I'd like to plot
a set of data points for a 'normal' group together with these 2 grey areas.)

Here's a simple example of the 2 lines:
plot(age,y.high,type='n',ylim=c(100,400),ylab='Y Range',xlab='Age (years)')

Is it possible to fill the area between the 2 lines filled with, for
example, 'grey30' ?

thanks very much in advance,
David Freedman

David Freedman
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