dear list
  I am student M.S. statistics in department statistics . I am working in  the function "nls" in the [R 2.3.1] with 246 data and want to fit the "exp" model to vectors( v and u ) but I have 
a problem to use it
  u
  5.000000e-13 2.179057e+03 6.537171e+03 1.089529e+04 1.525340e+04
  1.961151e+04 2.396963e+04 2.832774e+04 3.268586e+04 3.704397e+04
 4.140209e+04 4.576020e+04 5.011831e+04 5.447643e+04
  v
 8.382562e-01 4.090868e+02 1.311053e+03 2.124143e+03 3.365494e+03
 2.138903e+03 7.687774e+03 1.028396e+04 1.004186e+04 2.059798e+04
 1.438464e+04 2.861373e+04 2.294919e+04 2.807701e+04
data1<-data.frame(u=u ,v=v)
    nls(v~c0+(ce*(1-exp((-u)/ae))),data=data1,start=list(c0=0,ce=1000,ae=3000))
Error in nls(v ~ c0 + (ce * (1 - exp((-u)/ae))), data = data1, start = list(c0 = 0,  : 
        step factor 0.000488281 reduced below 'minFactor' of 0.000976563
  i dont know how to solve it, please help me .
 best regards
Sadeghian
 
   

       
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