Hi, 
I am trying to do a nls fitting using the SSfpl self-restart function but I got an error like the following:

> nls.2 <- nls(map.rr ~ SSfpl(mail.pv, phi1, phi2, phi3, phi4), data=pv.rr.200)
Error in nls(y ~ cbind(1, 1/(1 + exp((xmid - x)/exp(lscal)))), data = xy,  :
        step factor 0.000488281 reduced below `minFactor' of 0.000976562

where phi[-4] are unintialized.

I have tried to use getInitial() first but still got the same error.

Do I miss anything here?
 
Please advise. 

thanks a lot,


Yun-Fang
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