R help - Jul 2010 - setting up dates

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.

Thank you in advance,
Sincerely,
Erin


-- 
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com

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)