> -----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 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
