[R] Testing for warning inside functions

[Vidhyanath Rao]

This is probably a newbie question: How do I test, inside a function, is
a call I made from inside that function produced a warning?

[For those who want the gory details: I have a list of text files tagged
with a classification. I want to know which words can serve as key words
for recognizing the class. One thing I want to try is to fit a binomial
model to the number of occurrences of a word in the documents and see if
the classification explains a reasonable amount of the variation. A
large percentage of the time, this produces a warning about
non-convergence. I want to filter out these words as I go through the
array of word frequencies. I looked at last.warning, but I can't figure
out how to test it properly under all possible circumstances.]

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