Dear R-devel / Dr. Murrell -
This is similar but ultimately unrelated (I think) to something I posted
about in February. See my original post here:
https://stat.ethz.ch/pipermail/r-devel/2008-February/048278.html
I start R with the --vanilla option, and run the following code.
## BEGIN SAMPLE R CODE
library(grid)
for(i in seq(0, 1, by = .1)) {
for(j in seq(0, 1, by = .1)) {
angle <- runif(1, 1, 180)
col <- sample(colors(), 1)
pushViewport(viewport(x = i, y= j, width = .1, height = .1,
angle = angle, gp = gpar(col = col)))
grid.rect()
popViewport()
}
}
## END SAMPLE R CODE
I can then resize the resulting R Graphics Device window and everything
seems to work fine.
If I then do issue 'library(tcltk)', and reissue the above code, and
then resize the resulting window to something fairly small, I get the
following error that shows up at my R prompt:
Error: Cannot pop the top-level viewport (grid and graphics output mixed?)
The error seems harmless, but eventually, after doing this "enough", and
closing the graphics window, R may segfault,
*** caught segfault ***
address 0xfc, cause 'memory not mapped'
Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
I have tracked down the error message I am receiving with some very
rudimentary techniques, and narrowed it down to the L_unsetviewport
function defined in grid.c. The error string in question appears two
places in that function, and I determined in my case that it is the
first instance that is actually outputting the error. That's about as
far as I can take it unfortunately.
Again, this only seems to happen after I load the tcltk package.
I am running RHEL version 4 with KDE on a 32-bit Intel processor.
Here is my session info, immediately after starting R...
sessionInfo()
R version 2.7.0 (2008-04-22)
i686-pc-linux-gnu
locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Thanks,
Erik Iverson
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