[R] A simple question regarding plot of nls objects

[Mielke Hans]

Hi,

I was trying to run the example of Indomethacin kinetics from the book:

## From Pinheiro/Bates, Mixed-Effects-Models in S and S-Plus,
## Springer, Second Printing 2001, Section 6.2
library(nlme)
plot(Indometh)
fm1Indom.nls <- nls(conc~SSbiexp(time,A1,lrc1,A2,lrc2), data=Indometh)
summary(fm1Indom.nls)
plot(fm1Indom.nls,Subject~resid(.),abline=0)
## ....

the last plot command gives me the error message: Subject not found in data

What point am I missing?

Thanks in advance,
Hans
-- 

Dr. Hans Mielke
Federal Institute for Risk Assessment
Thielallee 88-92
14195 Berlin
Germany
Phone: +49 30 8412-3969