R help - Mar 2006 - nls: formula length greater than 502

Hi ,
  
    I am using nls(formula)
  
  where formula is y~ _expression
  
  y  is 1 character
  ~  is 1 character
  
  now i have an _expression that is greater tha 502 characters. but R  does not
recognize anything greater than 502 characters. (Note the  _expression itself is
created using paste and as.formula commands)
  
  Does anyone have a suggestion. (BTW i have checked my formula and its right in
case you have doubts about its length)
  
  Thanks.
  
  Harsh
		
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