On 2010-07-09 13:29, Duncan Murdoch wrote:
On 09/07/2010 2:36 PM, Jim Bouldin wrote:
> 1. The expression you gave us is clearly not the one that produced
the > error: it involved "ring.area" and "ba.beg".
> > 2. You don't tell us what x and y are, so we can't reproduce
anything.
Sorry, I guess that was unclear. I changed the response and independent
variable names to y and x respectively, in hopes that would be clearer.
Both are numeric variables.
When I make up my own numeric variables I don't get the error you got.
So I still can't reproduce anything.
Duncan Murdoch
Two possibilities, although neither of them caused problems
for me with made-up data:
1. do you have T defined as some object?
If so, remove it or (better) use TRUE.
2. did you put 'trace=T' inside your start list?
Also, it seems that you might want a model of the type
y ~ A * ( 1 - exp( B * x) )
which would be a bit simpler.
-Peter Ehlers
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
