You can always define a dummy graphics driver for batch mode by
dummy.driver<-function() postscript(file="/dev/null")
which will actually do all the calculations needed (and so catch errors)
but won't produce anything. Then you can edit the Rprofile so that
dummy.driver() is started if you aren't running interactively.
I don't know if something similar can be done for Mac/Win.
-thomas
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