Simply using Rtangle("file.Rnw") gives the following error message in R-2.3.1. It used to work fine with the earlier versions of R. 
   
  > Rtangle("qtlbim.Rnw")
Error in Rtangle("qtlbim.Rnw") : unused argument(s) ( ...)
  > RtangleSetup(file="qtlbim.Rnw",output="qtlbim.R")
Writing to file qtlbim.R
Error in RtangleSetup(file = "qtlbim.Rnw", output = "qtlbim.R") :
        argument "syntax" is missing, with no default

 		
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