[R-SIG-Finance] issues with zoo masking as.Date function, resulting in issues with as.Date

[Achim Zeileis]

On Tue, 18 Oct 2011, Zhang, Ivan wrote:

> Thanks for the tip and workaround, this sounds like a bug with zoo 
> package.

We (= timeDate and zoo maintainers) are currently discussing off-list how 
to best resolve the situation. We hope to have a proper solution soon.

Best,
Z

> -Ivan
>
> -----Original Message-----
> From: Yohan Chalabi [mailto:chalabi at phys.ethz.ch]
> Sent: Tuesday, October 18, 2011 8:49 AM
> To: Gabor Grothendieck
> Cc: Zhang, Ivan; r-sig-finance
> Subject: Re: [R-SIG-Finance] issues with zoo masking as.Date function, resulting in issues with as.Date
>
>
> On 14 oct. 2011, at 20:19, Gabor Grothendieck wrote:
>
>> On Fri, Oct 14, 2011 at 1:21 PM, Zhang, Ivan
>> <ivan.zhang at bankofamerica.com> wrote:
>>> Hi Everyone,
>>>
>>> I just upgraded to 2.13, this seems like a very obvious issue however I haven't seen this addressed anywhere, perhaps I am missing something elementary?
>>>
>>> library(timeDate)
>>>> as.Date(timeDate('2011-10-10'))
>>> [1] "2011-10-10"
>>>> library(zoo)
>>>
>>> Attaching package: 'zoo'
>>>
>>> The following object(s) are masked from 'package:base':
>>>
>>>    as.Date
>>>
>>>> as.Date(timeDate('2011-10-10'))
>>> Error in as.Date.default(timeDate("2011-10-10")) :
>>>  do not know how to convert 'timeDate("2011-10-10")' to class "Date"
>>>>
>>>
>>
>> The timeDate package needs to export as.Date.timeDate in its NAMESPACE
>
> ?? timeDate does export as.Date.timeDate as an S3 method.
>
> If the zoo package overwrites a base function and do not import namespaces of other packages which extend it. It cannot work.
>
> in this particular example
>
> base::as.Date(timeDate('2011-10-10'))
>
> works.
>
>> file .   As a workaround you can do this:
>>
>>> as.Date.timeDate <- timeDate:::as.Date.timeDate
>>> as.Date(timeDate('2011-10-10'))
>> [1] "2011-10-10"
>>
>> --
>> Statistics & Software Consulting
>> GKX Group, GKX Associates Inc.
>> tel: 1-877-GKX-GROUP
>> email: ggrothendieck at gmail.com
>>
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>
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