[R] Weighted nls

[Rundle, Daniel]

Dear R Community,
 
I am attempting to perform a weighted non-linear least squares fit.  It has already been noted that the weights option is not yet implemented for the nls function, but no one seems to offer any suggestions for getting around this problem.  I am still curious if a) anyone has code they have written which includes a weight options for nls, or b) if there is another model which would allow least squares fitting to a non-linear function.
 
Thank you for reading this,
 
Dan