[R] nls() and "singular grandient"

From: Guillaume STORCHI <nioniodesbois_at_yahoo.fr>
Date: Wed 23 Mar 2005 - 00:45:29 EST


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



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