On Mon, 24 Jan 2005, Barry Rowlingson wrote:
McGehee, Robert wrote:
a <- eval(parse(text = paste(rep(1, 499), collapse = "+")))
Another little investigation shows that if you type:
1+1+......+1
at the > prompt (with over 498 '+1's) both R1.8.1 and R2.0.0 produce an error message, so it would appear to be something specific to the eval() function in R 2.0.x suppressing the error message.
It's not. An error is being thrown whilst trying to print the message, as that is doing an evaluation, and recursive errors bail out without printing. I suspect this is due to the deparsing changes in 2.0.0, but a simple fix is to make sure the call is not printed, as in
errorcall(R_NilValue, "evaluation nested too deeply: infinite recursion / options(expression=)?");
in eval.c:288 (You don't actually need to know as the problem is caused at the top-level expression immediately preceeding the error.)
-- Brian D. Ripley, [EMAIL PROTECTED] 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
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