Thank you for your message. This isn't the Rogers equation, although I am not familiar with that particular one. It is from Juliano's (2001) Nonlinear Curve Fitting chapter in Scheiner and Gurevitch. -- View this message in context: http://r.789695.n4.nabble.com/NLS-Singular-Gradient-Error-tp2069029p2069271.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ 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.
