problem with parse(text=quote(name))
This comes from bolting on srcrefs: as.character() was used for srcrefs, but *not* for coercion (as documented), and quote(myName) was coerced to NULL. The simplest way out is to use text <- as.character(text) early on. Maybe coerceVector should handle symbols, though.
On Fri, 12 Mar 2010, William Dunlap wrote:
Calling parse(text=quote(name)) or text=as.name("name")
makes parse() prompt for input from the command line
and then it returns a parse of the initial characters
of 'name' (depending on how many characters were typed
at the prompt). E.g.,
> parse(text=quote(myName))
?1/3 expression(myN) attr(,"srcfile") <text>
> parse(text=quote(myName))
?1/34 expression(myNa) attr(,"srcfile") <text>
> parse(text=quote(myName))
?1/345 expression(myNam) attr(,"srcfile") <text> where the ? lines are where parse prompted for input and I typed a valid R expression. I ran into this when starting to convert code that used a deparse/parse cycle to avoid the cycle by storing the expressions themselves and I hadn't yet taken out one of the calls to parse(text=myText). I see it in 2.10.1 and "R version 2.11.0 Under development (unstable) (2010-03-07 r51225)." Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com
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Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595