Thank you, Bjørn-Helge.
A shorter version is
plot(1:500, col = gl(2,250))
Interestingly, with much shorter vectors of length (n), the correct warning
is produced (n times).
And once that has happened, you can use longer vectors without
any problem.
As you said ``issued just after starting R''
seems quite relevant.
When run in 'R -d gdb', the backtrace ("bt") seems to indicate
that the problem is happening during the (C-level) warning() call.
Martin
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