From murdoch@stats.uwo.ca  Tue Sep 17 16:02:09 2002
From: murdoch@stats.uwo.ca (Duncan Murdoch)
Date: Tue, 17 Sep 2002 11:02:09 -0400
Subject: Documentation for passing character NAs to .C
Message-ID: <umgeoucmeciai57h9fb14p9sksaha3atrf@4ax.com>

I can't see any mention in the docs of what happens when a character
string NA is passed to an external function.  What appears to happen
is that it is converted to the two letter string 'NA'; I can't think
of anything better to do, but this should be mentioned somewhere (or
perhaps more prominently).  

The places I thought to look were the .C help file, and section 4.2 of
the Writing Extensions manual.

Duncan Murdoch

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Documentation for passing character NAs to .C
Duncan Murdoch