Question: fmOrange = nls(circumference ~ Hmax/(1+exp(-r*(age-tmid))), + start= c(Hmax=220, tmid = 100,r=0.2), + data = Orange, + trace = TRUE) Error in nlsModel(formula, mf, start, wts,

fmOrange = nls(circumference ~ Hmax/(1+exp(-r*(age-tmid))), + start= c(Hmax=220, tmid = 100,r=0.2), + data = Orange, + trace = TRUE) Error in nlsModel(formula, mf, start, wts, scaleOffset = scOff, nDcentral = nDcntr) : singular gradient matrix at initial parameter estimates

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