[R] nlrob(...) returns error message

From: Timo Schlaefer <timo.schlaefer_at_web.de>
Date: Mon, 16 May 2011 22:19:18 +0200 (CEST)

Dear all,
I implemented a non-linear model using nls(...) and it works just fine. I now tried to run the same model using nlrob(...) which basically does the same but uses a more robust estimation procedure. My problem: I cannot seem to get nlrob(...) running. Irrespective of how I try to call the function, I always get the error message "Error in is.null(x) : 'x' is missing". I do not use the variable "x" at all so this must be some kind of different problem.  
Can anyone help me out here?
Many thanks
Karlsruhe Institute of Technology

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