Thanks Berend, setting lower=c(0,0.01) seems to have solved the problem. I have a dataset with 200+ cropped fields with associated data and wanted to generate each plot in a way that minimized the visual residuals between the green squares and blue circles. I have inserted a resulting plot so you can see how your suggestion has helped me accomplish this end.
Eric http://r.789695.n4.nabble.com/file/n3169658/Field__18_.png -- View this message in context: http://r.789695.n4.nabble.com/optim-and-singularity-tp3168722p3169658.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.