I am running R as an invisible subprocess in another program (RExcel). Using try I can catch errors and print the errors produced by an R statement. Is there a way to know if running a statement caused a warning message? last.warning gives me the last warning, but I do not have any indication what the statement was that caused the message. I can of course store last warning before I run a statement and then compare last.warning with this stored message to see if it has changed, but that is a) clumsy b) still does not cover situations when I get the same warning as the last one by coincidence.
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