[R] using nls to fit a curve to data

jpl s-jlubben1 at math.unl.edu
Fri Sep 5 16:16:48 CEST 2008


I am trying to fit a curve to data.  My command line is:


I get the error message:
Error in numericDeriv(form[[3]], names(ind), env) : 
        Missing value or an infinity produced when evaluating the model
In addition: Warning message:
full precision was not achieved in 'gammafn' 

My starting values yield a curve very similar t to other models which I
fitted successfully.  So any suggestions?  I've tried different starting
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