[Rd] names on cum* functions

[Patrick Burns]

Prof Brian Ripley wrote:

>On Sat, 15 May 2004, Patrick Burns wrote:
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>>Is it accidental or on purpose that names get stripped from the
>>result of "cumsum", "cumprod", "cummin" and "cummax"?
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>Almost certainly accidental.
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>>If it is accidental, I suggest that keeping names (and other attributes)
>>would be appropriate.  (Found porting code from S-PLUS.)
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>Names, sure.  I am not so sure about all other attributes, in particular 
>class (suppose these were difftimes?).
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I was thinking about dim -- I agree that class could be problematic.
Given this counter-example, I would find it hard to argue that
anything beyond names should be saved.