[R] apply and factor

[Jim Lemon]

Prof Brian Ripley wrote:
> 
> There is a function conflicts() to do the checking.
> Deliberate overrides are fairly common, for example when debugging,
> and it is probably better to get into the habit of using conflicts()
> if you get strange results.
> 
Martin Maechler kindly informed me of conflicts() after I had posted a
suggestion for dup.name(). However, conflicts() only tells you _after_
you have clobbered something, while dup.name() allows you to check
beforehand. I do agree that it is a time-consuming operation, as
dup.name() takes about 5 seconds to run. It's mostly useful to avoid
trashing a laboriously constructed data set in the working directory.

Jim
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