Le Mardi 5 Septembre 2006 0:03, hadley wickham a écrit : > > <<>>= > > str(women) > > women$height > > women[,1] > > "["(women,1) > > @ > > > > to show the equivalence of three methods of extracting an element from > > a data.frame. > > > > However Sweave returns the last of these as > > > > women[1] > > > > in the S input chunk > > > > How can I force it not to do this and return "["(women,1) > > I don't think you can. Sweave parses your R code and from then on > uses the internal R representation. R normalises the parse tree in > certain ways (eg. strips comments, formats source code, and clearly > normalises some function calls). Since sweave uses this, and not the > original text, I don't think there is anyway to get around this, > unless there is some trick during parsing. > > (And don't forget women[[1]]) > > Hadley
So here's a workaround (untested): <<echo=TRUE, eval=TRUE>>= str(women) women$height women[,1] @ <<echo=TRUE, eval=FALSE>>= "["(women,1) @ <<echo=FALSE, eval=TRUE>>= "["(women,1) @ I often end up doing similar things. HTH Vincent -- Vincent Goulet, Professeur agrégé École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
