Question: fmOrange = nls(circumference ~ Cmax/(1+exp(-r*(age-tmid))), + start= c(Cmax=250, tmid = 120,r=0.05), + algorithim = port, + data = Orange, + trace = TRUE) Error in

fmOrange = nls(circumference ~ Cmax/(1+exp(-r*(age-tmid))), + start= c(Cmax=250, tmid = 120,r=0.05), + algorithim = "port", + data = Orange, + trace = TRUE) Error in model.frame.default(formula = ~circumference + age, data = Orange, : variable lengths differ (found for '(algorithim)')

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