Hi all,
I've (tried) to look through the bug tracker, and gmane-search the R list to
see if this has been mentioned before, and it looks like it hasn't.
According to the R 2.9.0 release notes[1], the expand.grid function should now
take a stringsAsFactor=LOGICAL argument which controls whether or not the
function coerces strings as factors. While the parameter is indeed in the
function, a quick examination of the function's source shows that the value
of this argument is never checked, and all strings are converted to factors
as a matter of course.
The fix is pretty easy, and I believe only requires changing the `if` check
here:
if (!is.factor(x) && is.character(x))
x <- factor(x, levels = unique(x))
To:
if (!is.factor(x) && is.character(x) && stringsAsFactors)
x <- factor(x, levels = unique(x))
I can open a ticket regarding this issue and add this there if necessary.
Thanks,
-steve
[1] http://article.gmane.org/gmane.comp.lang.r.general/146891
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