[R] Accessing just the value of an object but not the attributes
maechler at stat.math.ethz.ch
Tue Oct 2 17:21:02 CEST 2001
>>>>> "Johann" == Johann Petrak <johann at ai.univie.ac.at> writes:
Johann> I have the feeling that this is a dumb question but oh well ...
no, actually not at all dumb
Johann> When I have an object x with several attributes, y <- x will
Johann> make a copy of x with all the attributes included. What if I
Johann> just want y to get the value assigned but nothing else (no
Johann> class, names, dim or other attributes)?
The answer -- `unfortunately' IMHO ---
is as.vector() :
>> `vector' .......
>> `as.vector', a generic, attempts to coerce its argument into a
>> vector of mode `mode' (the default is to coerce to whichever mode
>> is most convenient). The attributes of `x' are removed.
IMO, a vector with attributes is still a vector, particularly
if these are just names.. hence as.vector() should leave it
alone, but -- alas -- it's for compatibility reasons too
important to be changed.
So even if a new dropattributes() function would do what as.vector() does
now, it would break too much code if as.vector() was changed...
Note that "unfortunately" is my personal opinion, not a general R core one.
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO D10 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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