[R] setting up dates

Gabor Grothendieck
Fri, 16 Jul 2010 17:06:05 -0000

On Fri, Jul 16, 2010 at 12:38 PM, Erin Hodgess <erinm.hodgess at
gmail.com> wrote:
> I have several data sets, which begin early in 2002 and run until
> yesterday. ?They do not have observations every day. ?For example:
>> xd1[1:10]
> 2002-02-25 2002-02-26 2002-02-28 2002-03-01 2002-03-04 2002-03-05
2002-03-07
> ? ? ? ? 7 ? ? ? ? ?8 ? ? ? ? ?1 ? ? ? ? ?9 ? ? ? ? 12 ? ? ? ? ?3 ? ? ? ? ?5
> 2002-03-08 2002-03-11 2002-03-12
> ? ? ? ? 7 ? ? ? ? 10 ? ? ? ? ?5
>>
>
>
> I want to set up zoo series which has every day from 2002-01-01
> through yesterday. ?There should be zeros on the "non appearing"
dates
> and the previously seen values on the appearing dates.
>
> I've tried union and merge, but they didn't seem to work correctly.
>

Try this:

z <- zoo(c(7, 8, 1, 9, 12, 3, 5, 7, 10, 5),
   as.Date(c("2002-02-25", "2002-02-26",
"2002-02-28", "2002-03-01",
      "2002-03-04", "2002-03-05", "2002-03-07",
"2002-03-08", "2002-03-11",
      "2002-03-12")))

dd <- seq(start(z), end(z), "day")
merge(z, zoo(,dd), fill = 0)

Please try displaying your data using dput to make it easier to copy
it into R.  For example,
dput(z)