> -----Original Message----- > From: William Dunlap > Sent: Friday, July 31, 2009 10:15 AM > To: 'Sundar Dorai-Raj'; r-de...@stat.math.ethz.ch > Subject: RE: [Rd] update.formula and backticked colons > > > -----Original Message----- > > From: r-devel-boun...@r-project.org > > [mailto:r-devel-boun...@r-project.org] On Behalf Of Sundar Dorai-Raj > > Sent: Thursday, July 30, 2009 2:28 PM > > To: r-de...@stat.math.ethz.ch > > Subject: [Rd] update.formula and backticked colons > > > > I just noticed the following in update.formula and I'm wondering if > > this behavior is the intention of the developers. Here's an example: > > > > update(`a: b` ~ x, ~ . + y) > > > > Note now that the response has no backticks and is > interpreted as a:b > > (i.e. ":" is now an operator). This is because in update.formula the > > call to terms.formula uses simplify = TRUE. I'm working > with data that > > has a lot of colons in their names and for reporting > purposes I don't > > want to use make.names to avoid this situation. I do have a solution > > which simply avoids using update.formula, but I wonder if the > > developers would consider removing the "simplify" argument and allow > > it to be passed through "...", which is currently ignored by > > update.formula. Alternatively, add a simplify=TRUE to the > > update.formula call, which can manually be set to FALSE by the user. > > > > I would love to hear any comments or criticisms of my findings. > > > > Thanks, > > > > --sundar > > It would be nice to get right of the deparse/parse cycle in > terms.formula, > since that often causes problems. However, I think that > adding backticks=TRUE
Typo above: backtick should be singular. > to terms.formula:fixFormulaObject's call to > deparse(form[[2L]]) would fix the > immediate problem. (I haven't spent much time looking for > bad side effects > of this change to terms.formula, which gets called in a lot > of other situations.) > > Bill Dunlap > TIBCO Software Inc - Spotfire Division > wdunlap tibco.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
