Paul Shannon wrote: > Hi Herve, > > I think you found the problem: > > > nchar('AT') > Error in nchar("AT") : > 2 arguments passed to .Internal(nchar) which requires 3 > > > Weird, no? Absolutely! Maybe you could ask on the R-SIG-Mac mailing list? r-sig-mac at stat.math.ethz.ch Good luck! H. > > - Paul >