On Sun, 13 Jun 2004 [EMAIL PROTECTED] wrote:
> Full_Name: Philip Gross
> Version: 1.9.0
> OS: Linux Redhat 9.0
> Submission from: (NULL) (65.57.245.11)
>
>
> Among the many conversions for POSIXct values, there does not seem to be one
> which will accept an actual POSIX timestamp, e.g. as produced by MySQL's
> UNIX_TIMESTAMP() function. I have fixed this by adding the following lines to
> R-1.9.0/src/library/base/R/datetime.R , at line 89:
>
> if(is.numeric(x))
> return(structure(x, class = c("POSIXt", "POSIXct")))
>
> I am far from an R guru, and this was done based on pattern matching the code.
> It seems to work, though.
This cannot be correct, as the numeric value could be the integer number
of days after 1980-01-01, for example. This is a deliberate omission, but
you will note (I hope) that R does handle actual Unix timestamps in e.g.
Sys.time() and file.info(). (They use code equivalent to yours, *when*
the interpretation of the number is known, *and* x is known to be double
and not integer.)
Note this is not a bug, and would not have been even if your suggestion
had been correct. Please read the section on BUGS in the FAQ.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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