Hello,
I am trying to do a nonlinear model using the "nls" command in R software.
The data I am using is as follows:

A<-c(7.132000,8.668667,9.880667,8.168000,10.863333,10.381333,11.059333,7.589333,4.716667,4.268667,7.265333,10.309333,8.456667,13.359333,8.624000,13.571333,12.523333,4.084667
,NaN,NaN)

Pot<-c(21.700000,16.700000,16.400000,17.200000,17.833333,18.266667,18.966667,18.400000,19.100000,18.333333,16.333333,21.466667,7.033333,NaN,6.366667,6.700000,16.633333,15.666667
,17.883333,NaN)

When using the nls command I recieve an error like this:

 >mod = nls(A~ Amax * (1-exp(-b*Pot)),start=list(Amax=10,b=0.003))
/
/
Error in nls(A~ Amax * (1 - exp(-b * Pot), start = list(Amax = 10, :

/   step factor 0.000488281 reduced below 'minFactor' of 0.000976562

/I suppose that the used model is wrong, specialy Amax. I studied somewhere I should use "plinear" model but I did not know.
If you can guide me, any advices would be realy appreciated.
Thank you in advance,/

Best regards,
Mitra RAHMATI/


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