[R] is.na behavior

Erich Neuwirth erich.neuwirth at univie.ac.at
Thu Nov 19 21:59:33 CET 2015

I am not sure I undestand the issue.
But if the question is to decidedif an expression evaluates to NA,
using eval should solve the problem.
In fact, I do not really understand what an NA expression, and not an expression evaluating to NA,

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