R devel - Oct 2006 - stack imbalance in contour

I'm not sure if this has much significance or not -- but
it sounds rather ominous.  It doesn't appear to be new
as it happens with 2.0.0 in Linux (but the formatting of
the warning messages has improved).

 > contour(array(3e10, c(10,10), list(1:10, 11:20)))
Warning: stack imbalance in 'contour', 20 then 24
Warning: stack imbalance in '.Internal', 19 then 23
Warning: stack imbalance in '{', 17 then 21
Warning message:
all z values are equal
 > sessionInfo()
R version 2.4.0 RC (2006-09-27 r39543)
i386-pc-mingw32

locale:
LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United 
Kingdom.1252;LC_MONETARY=English_United 
Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252

attached base packages:
[1] "methods"   "stats"     "graphics" 
"grDevices" "utils"     "datasets"
[7] "base"    


Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

Patrick Burns <pburns at pburns.seanet.com> writes:
> I'm not sure if this has much significance or not -- but
> it sounds rather ominous.  It doesn't appear to be new
> as it happens with 2.0.0 in Linux (but the formatting of
> the warning messages has improved).
> 
>  > contour(array(3e10, c(10,10), list(1:10, 11:20)))
> Warning: stack imbalance in 'contour', 20 then 24
> Warning: stack imbalance in '.Internal', 19 then 23
> Warning: stack imbalance in '{', 17 then 21
> Warning message:
> all z values are equal
>  > sessionInfo()
> R version 2.4.0 RC (2006-09-27 r39543)
> i386-pc-mingw32
I see it on Linux too. It's a serious programming error in that
something has its PROTECT/UNPROTECT mechanism messed up. Fortunately,
it is protecting too much, which is not usually fatal. Also, it
appears to happen only in the all z equal case (the value 3e10 is
not magic - any nonzero z will do). We should get it tracked down,
but it's not worth breaking the code freeze for 2.4.0 over.

-- 
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