I suspect you have a protection problem. The specific message you quote
indicates that STRING_ELT is being called on an object of inappropriate
type: but it is quite likely that it is being called on uninitialized
memory as the intended object has been garbage-collected. Messages from a
corrupted R session do not always make sense: see the debugging info in
`Writing R Extensions' and especially the use of gctorture and valgrind.
Followups to R-devel, please: this looks very like a programming issue.
On Tue, 17 Oct 2006, Brahm, David wrote:
I have a daily job that attaches hundreds of pseudo-packages containing
data as promise objects (DDP's, ref: g.data package), and plots the
results to a multi-page pdf device. Sometimes it fails. Under R-2.2.1
it just gave segfaults. Under R-2.3.1 it gave this error message:
*** caught segfault ***
address (nil), cause 'memory not mapped'
Traceback:
1: load(system.file(data, paste(i, RData, sep = .), package =
pkg), env)
2: g.data.load(tm.time, hist.20051012)
3: g.inorder(93500, tm.time, 16)
aborting ...
Segmentation fault
Under R-2.4.0, it now gives this message:
Error: STRING_ELT() can only be applied to a 'character vector', not a
'builtin'
(which appears to be generated inside main/memory.c).
I'm sorry I can't give a reproducible example, because it seems to
happen randomly, and at different points in the process. So this is
just a shot in the dark -- does anybody recognize this behavior? TIA.
-- David Brahm ([EMAIL PROTECTED])
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--
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, UKFax: +44 1865 272595
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