On Tue, 2005-08-16 at 21:44 +0200, Peter Dalgaard wrote: > Gavin Simpson <[EMAIL PROTECTED]> writes: > > > Dear list, > > > > given this formula: > > > > > fmla <- formula(y1 ~ spp1 + spp2 + spp3 + spp5) > > > fmla[[3]] > > spp1 + spp2 + spp3 + spp5 > > > > is this the intended behaviour of as.character: > > > > > as.character(fmla[[3]]) > > [1] "+" "spp1 + spp2 + spp3" "spp5" > > Yes.
Thanks Uwe, Brian and Peter for setting me straight. Being unobservant, forgetful and stupid, all in one day, is some going, even for me. All the best, Gav > > ? Where does the extra "+" come from? > > What extra "+" ? There are three of them in fmla[[3]] and three in > as.character(....). > > as.character of an object of mode call is obtained by converting it to > a list and deparsing each term (modulo some details regarding > backquotes). This is somewhat peculiar, but quite a bit of legacy code > is depending on it. Things like testing for as.character(e)[1] == "~" > > -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson [T] +44 (0)20 7679 5522 ENSIS Research Fellow [F] +44 (0)20 7679 7565 ENSIS Ltd. & ECRC [E] gavin.simpsonATNOSPAMucl.ac.uk UCL Department of Geography [W] http://www.ucl.ac.uk/~ucfagls/cv/ 26 Bedford Way [W] http://www.ucl.ac.uk/~ucfagls/ London. WC1H 0AP. %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html