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...on a windows XP system that I have access to works flawlessly. Any suggestions about how to proceed? Thanks muchly, Michael _ -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: michael_manning.vcf Url: https://stat.ethz.ch/pipermail/r-help/attachments/20080303/1bb4fc74/attachment.pl

I'm tyring to fit a relatively simple nls model to some data, but keep coming up against the same error (code follows): Oto=nls(Otolith ~ Linf*(1-exp(-k(AGE-to))), data = ages, start = list(Linf=1000, k=0.1, to=0.1), trace = TRUE) The error message I keep getting is "Error in eval(expr, envir, enclos) : could not find function "k"". I've used this