NextMethod causes R 2.2.0 to crash (PR#8416)
Bill, This is a 2.2.0 Windows problem, solved in 2.2.1. What happened was that someone trying to be helpful increased the evaluation nesting limit in 2.1.0, and Windows has a small C stack (2Mb) which can easily be exceeded. I now get
julian(m)
Error: evaluation nested too deeply: infinite recursion / options(expressions=)? as I should. The nesting limit has been reduced and the C stack size increased. It is legitimate to call NextMethod in a default method, but it is all too easy to get loops. In your case you want the Date method, not the next method (which since there is only one class will be the default). I would advise Windows users of 2.2.0 to 1) update 2) if that is not possible, set options(expressions=1000). Brian
On Wed, 21 Dec 2005 Bill.Venables at csiro.au wrote:
I found writing the following default method the for the generic
function "julian" causes R to crash.
julian.default <- function(x, ...) {
x <- as.Date(x)
NextMethod("julian", x, ...)
}
Here is a test example
m <- as.Date("1972-09-27") + 0:10
m
[1] "1972-09-27" "1972-09-28" "1972-09-29" "1972-09-30" "1972-10-01" "1972-10-02" "1972-10-03" [8] "1972-10-04" "1972-10-05" "1972-10-06" "1972-10-07"
class(m)
[1] "Date"
julian(m)
[1] 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 attr(,"origin") [1] "1970-01-01"
m <- as.character(m) class(m)
[1] "character"
julian(m)
< R crashes> --please do not edit the information below-- Version: platform = i386-pc-mingw32 arch = i386 os = mingw32 system = i386, mingw32 status = major = 2 minor = 2.0 year = 2005 month = 10 day = 06 svn rev = 35749 language = R Bill Venables, CMIS, CSIRO Laboratories, PO Box 120, Cleveland, Qld. 4163 AUSTRALIA Office Phone (email preferred): +61 7 3826 7251 Fax (if absolutely necessary): +61 7 3826 7304 Mobile (rarely used): +61 4 1963 4642 Home Phone: +61 7 3286 7700 mailto:Bill.Venables at csiro.au http://www.cmis.csiro.au/bill.venables/
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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