On Mar 16, 2011, at 10:22 PM, Erin Hodgess wrote:
Dear R People:
I have a monthly time series which runs from January 1998 to
December 2010.
When I use tsp I get the following:
tsp(ibm$ts)
[1] 1998.000 2010.917 12.000
Is there an easy way to convert this to a seq.Date object, please?
I would like to have something to the effect of
1998/01/01 .... 2010/12/01
Several (at least two, anyway) packages have functions to convert
fractional years:
RSiteSearch("fractional year dates")
or you can use
library(sos)
Most date formats are in days so another option would be something
along these lines
conv.frac.yr <- function(yr) as.Date( (yr-1970)*(365 + (yr %% 4 ==
0)), origin="1970-01-01" )
Unfortunately that doesn't take into account leap years in any except
the current year so:
> as.Date(sapply(c (1998.000, 2010.917), conv.frac.yr),
origin="1970-01-01")
[1] "1997-12-25" "2010-11-21"
Not acceptable. Since others have already wrestled with this use
their work to your advantage.
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodg...@gmail.com
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
