[R] Vectors of years, months, and days to dates?

Peter Dalgaard p.dalgaard at biostat.ku.dk
Mon Jun 7 18:56:57 CEST 2004

"Shin, Daehyok" <sdhyok at email.unc.edu> writes:

> Thanks, but, what I want is to convert three vectors of years, months, and
> days directly into POSIXlt or Date objects
> without creating character vectors.

Well, if you insist:

 x <- as.POSIXlt(structure(rep(0,2),class="POSIXct"))
 x$year <- years-1900
 x$mon <- months-1
 x$mday <- days

This is definitely not kosher programming, and I doubt that it is the
least bit faster than the other solutions, but there's no character
vectors in there...

   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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