function vectors (was [R]..... lists of expressions)
maechler at stat.math.ethz.ch
Mon Apr 26 18:47:51 CEST 2004
>>>>> "Tamas" == Tamas Papp <tpapp at axelero.hu>
>>>>> on Mon, 26 Apr 2004 18:26:25 +0200 writes:
Tamas> On Mon, Apr 26, 2004 at 07:50:07AM -0700, Thomas Lumley wrote:
>> An expression is already a vector in this sense
Tamas> Thanks (also to Deepayan Sarkar), now I see. I have found
Tamas> ?character-class, and now I see that vectors can have a mode of
Tamas> "expression", too.
Tamas> Another (related) question: why aren't there vectors of
Tamas> mode="function" in R? Are they difficult to implement, not needed,
Tamas> etc., what is the reason for their abscence? I found that I can make
Tamas> a vector of functions by using expression and then eval, so there is a
Tamas> workaround, but I am just curious about this.
since lists of functions are easy enough to handle,
(and they *are* ``vectors'' (though not atomic ones) on the
C-level of R).
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