[R] nls singular gradient ..as always..

pakoun pkount at bgc-jena.mpg.de
Wed Jun 19 13:28:29 CEST 2013

Hi all. Sorry for posting again such a topic but I went through previous 
posts but couldn't find a solution.

I use the following code to fit an exponential model to my data. I have 4
different datasets. For 3 datasets nls seems to work fine and I have no
error messages. But for 1 dataset I am getting the "world known" singular
gradient error.
   xfit.dNEE <-
I tried also with different starting values but still the same error...
Any help would be highly welcome.

Thank you in advance.

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