lauramorgana <at> bluewin.ch <lauramorgana <at> bluewin.ch> writes:
> > Hello, > I'm using the following for loop to find regression curves using a list of functions (formList), a list of .. long non-reproducible code removed > And I got the following error message: > Error in chol2inv(object$m$Rmat()) : l'elemento (3, 3) è zero, quindi l'inversa non può essere calcolata > Which translated should be: Error in chol2inv(object$m$Rmat()): the element (3, 3) is zero (NULL?), > that's why the > inverse (inverse function?) can not be computed nls is rather nasty or nice in telling you when the result should not be trusted. Other software gives nonsense result without blinking. In package nlme, there is a function nlsList which does directly what you want, but there is little help besides revising the model for the cases without convergence. Also try check Gabor Grothendieks package "nls2" which could help you finding better start values. Dieter ______________________________________________ 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.
