update.formula and backticked colons

William Dunlap · 2009-07-31T17:15:27Z

> -----Original Message----- > From: r-devel-bounces at r-project.org > [mailto:r-devel-bounces at r-project.org] On Behalf Of Sundar Dorai-Raj > Sent: Thursday, July 30, 2009 2:28 PM > To: r-devel at 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 a

William Dunlap

Fri, Jul 31, 2009 10:15 AM

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

Thread (6 messages)

Sundar Dorai-Raj update.formula and backticked colons Jul 30 Sundar Dorai-Raj update.formula and backticked colons Jul 30 Sundar Dorai-Raj update.formula and backticked colons Jul 31 Brian Ripley update.formula and backticked colons Jul 31 William Dunlap update.formula and backticked colons Jul 31 William Dunlap update.formula and backticked colons Jul 31