[R] how to concatenate factor vectors?

[Sam Steingold]

> * R. Michael Weylandt <zvpunry.jrlynaqg at tznvy.pbz> [2012-10-18 16:01:37 +0100]:
>
> On Thursday, October 18, 2012, Sam Steingold wrote:
>
>> > * Bert Gunter <thagre.oregba at trar.pbz> [2012-10-17 23:21:44 -0700]:
>> >
>> > However, Is level "5" in 'a' the same as level "5" in 'b' ?
>>
>> yes, of course.
>> would anyone want to _different_ factors with identical string
>> representations?!
>
> Off the cuff, studying education and grades: F could be a grade or a
> gender.

would you ever want to concatenate a vector of grades with a vector of
genders?
as I said elsewhere, the function which concatenates factors must check
that the levels are identical before proceeding.

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