BKMooney <bkmooney <at> gmail.com> writes: > > > Also, when I tried to use nls, I get an error: > nls(ypts ~ exp(xpts)) > Error in getInitial.default(func, data, mCall = as.list(match.call(func, : > no 'getInitial' method found for "function" objects > > If someone could please point out what I am doing wrong, or point me to a > good resource on this, I would greatly appreciate it.
Read the documents on nls. There is not a simple example of the form you used on that page, all have a start value, or a special function to supply the initial values. For all non-linear fitting, you must supply reasonably good starting values, for example from a linear fit on the log-transformed data. 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.
