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gradient
2005 Mar 22
1
nls() and "singular grandient"
Hello,
I have a problem with nls() when I want to fit a model with more than two
parameters to be fitted which are written as start=list(a1=,a2=,a3=,...).
Everytime, it displays:'error... singular gradient'
it's a real pain!!!
Hope sb knows something about this
Thanks
GS