try the following:
age <- 1:10
y.low <- rnorm(length(age), 150, 25) + 10*age
y.high <- rnorm(length(age), 250, 25) + 10*age
plot(age,y.high,type = 'n', ylim = c(100, 400),
ylab = 'Y Range', xlab = 'Age (years)')
lines(age, y.low, col = 'grey')
lines(age, y.high, col = 'grey')
polygon(c(age, rev(age)), c(y.high, rev(y.low)),
col = "grey30", border = NA)
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://perswww.kuleuven.be/dimitris_rizopoulos/
Quoting David Freedman <[EMAIL PROTECTED]>:
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:
age=1:10
y.low=rnorm(length(age),150,25)+10*age
y.high=rnorm(length(age),250,25)+10*age
plot(age,y.high,type='n',ylim=c(100,400),ylab='Y Range',xlab='Age (years)')
lines(age,y.low,col='grey')
lines(age,y.high,col='grey')
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
Atlanta
--
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