R-alpha: ==NULL

Thomas Lumley thomas@biostat.washington.edu
Wed, 30 Apr 1997 09:42:52 -0700 (PDT)

Any comparison with NULL generates an error
Error: comparison is possible only for vector types
whereas in S(-PLUS) it gives NA, which seems more sensible.

Along similar lines, comparison with a length 0 vector returns logical(0)
in R but NA in S. 

Thomas Lumley
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