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rmodel
2007 Oct 25
0
Error message from nlmer
Hi,
I have R 2.6.0 with updated lme4 and Matrix packages, and I am trying to
fit a nonlinear multilevel model. I get the following error message:
Error in nlmer(f ~ grModel(x, w, Tmin, Tmax, Topt, kopt, m) ~ kopt |
flat, :
gradient attribute of evaluated model must be a numeric matrix
and I wonder what this may indicate.
The nonlinear model I try to fit is as follows:
> grModel
function(x,w,Tmin,Tmax,Topt,kopt,m)((x-Tmin)*(x-Tmax))/((x-Tmin)*(x-Tmax)-(x-Topt...