Thanks for the report. I meant to have R_isMissing always return
FALSE for active binding but had it returning TRUE intead. Fixed now
in R-devel.
luke
On Sun, 15 Mar 2009, Roger D. Peng wrote:
The following code produces an error in current R-devel
f <- function(value) {
if(!missing(value))
100
else
2
}
e <- new.env()
makeActiveBinding("x", f, e)
eval(substitute(list(x)), e)
The error, after calling 'eval' is
Error in eval(expr, envir, enclos) :
element 1 is empty;
the part of the args list of 'list' being evaluated was:
(x)
It has something to do with the change in R_isMissing in revision
r48118 but I'm not quite knowledgeable enough to understand what the
problem is. In R 2.8.1 the result was simply
eval(substitute(list(x)), e)
[[1]]
[1] 2
I can't say I know what the output should be but I'd like some
clarification on whether this is a bug.
Thanks,
-roger
--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: l...@stat.uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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