[R] blues in c

[Peter Dalgaard BSA]

Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

> On Tue, 25 Sep 2001, Bernie McConnell wrote:
> 
> > G'Day,
> >
> > I'm a little  confused why the c function has the followng effect on
> > classes - is this a feature ?  My workround [ class(cc) <- c("POSIXt",
> > "POSIXct") ] seems to do the job.
> 
> It's a legacy
> 
> c.POSIXct <- function(..., recursive=FALSE)
>     structure(c(unlist(lapply(list(...), unclass))),
> class=c("POSIXt","POSIXct"))
> 
> does the job.

Speaking of the devil... Is there any reason as.POSIXct shouldn't work
on numeric data?

> as.POSIXct(0)
Error in as.POSIXct.default(0) : Don't know how to convert `0' to class "POSIXct"
> structure(0,class=c("POSIXt","POSIXct"))
[1] "1970-01-01 01:00:00 CET"

(Discovered by trying

c.POSIXct <- function(..., recursive=FALSE)
    as.POSIXct(c(unlist(lapply(list(...), unclass))))

)
-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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