On Jul 18, 2011, at 15:48 , Gabor Grothendieck wrote:
> On Mon, Jul 18, 2011 at 8:56 AM, peter dalgaard <pda...@gmail.com> wrote:
>>
>> On Jul 18, 2011, at 14:08 , Gabor Grothendieck wrote:
>>
>>> On Sat, Jul 16, 2011 at 11:50 PM, Eduardo M. A. M. Mendes
>>> <emammen...@gmail.com> wrote:
>>>> Hello
>>>>
>>>> I am new to R and I need to convert some dates (numeric format by matlab)
>>>> to actual dates in R.
>>>>
>>>> For instance,
>>>>
>>>> Matlab -> 730456 -> >> datestr(730456)
>>>>
>>>> ans =
>>>>
>>>> 02-Dec-1999
>>>>
>>>
>>> Set the origin to Matlab's origin like this. Be sure you are using
>>> the indicated version of zoo or later:
>>>
>>>> library(zoo)
>>>> packageVersion("zoo")
>>> [1] ‘1.7.1’
>>>> as.Date(730456, origin = "0000-00-00")
>>> [1] "1999-12-02"
>>
>> Doesn't work on a Mac, and in general, I think it depends on a quirk in your
>> OS's date conversion utilities. What does work for me is
>
> Did you have zoo 1.7-1 loaded? What happens when you try it?
I did, actually:
> packageVersion("zoo")
[1] ‘1.7.1’
> as.Date('00-00-0000')
Error in charToDate(x) :
character string is not in a standard unambiguous format
> as.Date('0000-00-00')
Error in charToDate(x) :
character string is not in a standard unambiguous format
> as.Date(1, origin='0000-00-00')
Error in charToDate(x) :
character string is not in a standard unambiguous format
> as.Date(730456, origin='0000-00-00')
Error in charToDate(x) :
character string is not in a standard unambiguous format
.....
However, this was after reinstalling and reloading zoo. Restarting R and
retrying did indeed make things work.
>>
>> I fail to see what "zoo" has to do with this at all!
>
> zoo has its own as.Date.numeric method which accepts a superset of
> inputs that base::as.Date.numeric accepts.
Aha. Thanks.
--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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