My apologies.  I don't know how it happened, but somehow the library 
must have been corrupted.  I re-installed the zoo package, and all was 
well again.  Thanks!

Regards,
Marc

Gabor Grothendieck wrote:
> Can you provide a reproducible example.  See last line to every message
> on r-help. When I try it it works:
>
>   
>> median(zoo(1:3))
>>     
> 2
> 2
>
>
> On Sat, Sep 12, 2009 at 1:14 PM, Marc Chiarini <marc.chiarini@tufts.edu> wrote:
>   
>> Hello R-help community:
>>
>> I have what I think is a simple question that I hope someone can answer.
>>  When using the median() function on any zoo object (in particular, mine is
>> an irregular time series), I get the following error, which is thrown from
>> .gt():
>>
>> Error in if (xi == xj) 0L else if (xi > xj) 1L else -1L :
>>  argument is of length zero
>>
>> median() of course works fine on the coredata() of my zoo object, but not on
>> the object itself.
>>
>> Is the median.default function coded incorrectly for zoo objects?  If not,
>> then I don't understand why functions like mean() and sd() work correctly on
>> the same zoo object, but not median().  Am I asking the right questions?
>>  Thanks for any help you can offer.
>>
>> Regards,
>> Marc
>>     

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