On Oct 1, 2015, at 8:29 PM, Rolf Turner wrote:
> On 02/10/15 15:47, David Winsemius wrote:
>
> <SNIP>
>
>> On Oct 1, 2015, at 6:22 PM, Rolf Turner wrote:
>>>
>>> P.S. I have been unable to find a corresponding vector of the names
>>> of the days of the week, although I have a very vague recollection
>>> of the existence of such a vector. Does it exist, and if so what
>>> is it called?
>>
>> It's could called up by strptime because it is mapped to a character
>> vector by the internationalization database:
>>
>>> format( as.Date(1:7)+2, format="%A")
>> [1] "Sunday" "Monday" "Tuesday" "Wednesday" "Thursday"
>> "Friday" [7] "Saturday"
>
> <SNIP>
>
> When I try that (copying and pasting your code so that there's no chance of
> fumble-fingering) I get:
>
>> Error in as.Date.numeric(1:7) : 'origin' must be supplied
>
> Why do these things always happen to *me*???
Or why am I so lucky as to avoid the need for an origin when the help page says
the call is:
## S3 method for class 'numeric'
as.Date(x, origin, ...) # noting no default in the formals
The code says that origin should be supplied if it is missing:
> as.Date.numeric
function (x, origin, ...)
{
if (missing(origin))
origin <- "1970-01-01"
if (identical(origin, "0000-00-00"))
origin <- as.Date("0000-01-01", ...) - 1
as.Date(origin, ...) + x
}
--
David Winsemius
Alameda, CA, USA
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