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

2008-07-20 Thread Dimitris Rizopoulos 

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

2008-07-20 Thread Marc Schwartz 

on 07/20/2008 11:34 AM David Freedman wrote:

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


Try this:


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), age[1]), c(y.low, rev(y.high), y.low[1]),
col = grey30)


What you essentially need to do is to 'walk' the boundary of the 
polygon, be sure to 'close' the open end by returning to the starting 
point, and then fill it.


HTH,

Marc Schwartz

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