issues with zoo masking as.Date function, resulting in issues with as.Date

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

-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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