[R] add trailing dates with rbind

[Joshua Ulrich]

Eric,

Thanks for the recommendation for xts!

Frederik,

Please direct future questions about xts to R-SIG-Finance, or
Stackoverflow.  I (and other users) are more likely to see your
questions there than here on R-help.

Best,
Josh

On Wed, Aug 12, 2020 at 8:08 AM Frederik Feys <frefeys using gmail.com> wrote:
>
> Thank you so much Eric! Wonderful to have an R community helping out so quickly!
>
> > Op 12 aug. 2020, om 14:10 heeft Eric Berger <ericjberger using gmail.com> het volgende geschreven:
> >
> > Hi Frederik,
> > (short answer) modify the assignment statement to
> >     agg_d_h <- rbind( agg_d_h, data.frame(Group.date=next_date,x=0) )
> >
> >     Note: replace x=0 by your-variable-name=0
> >     Note: left-hand-side of the assignment statement should be agg_d_h
> >
> > (longer answer) Your approach is far from the best way to do this task, for a variety of reasons.
> > If you think that in the future you will be working a lot with daily time series and need to perform similar tasks, I would strongly recommend learning the xts data structure in the xts package.
> > If you have several time series with different date ranges, and all of them are xts objects, you can merge them with 'joins' (left joins, right joins, full joins). xts will automatically handle alignment
> > and preserving dates, etc.
> >
> > HTH,
> > Eric
> >
> >
> >
> >
> > On Wed, Aug 12, 2020 at 2:44 PM Frederik Feys <frefeys using gmail.com <mailto:frefeys using gmail.com>> wrote:
> > I am having a hell of a time, this must surely be simple to solve….
> >
> > Basically I want to add trailing dates to datasets with differing starting dates so that across datasets I have the same starting date.
> >
> > # make dataset with the same starting date
> > start_date = as.Date("2020-03-01")
> > d_start_date = min(agg_d_h$Group.date)
> >
> > diff_in_days = as.numeric(difftime(d_start_date, start_date, units = "days"))
> >
> > for(i in 1:diff_in_days) {
> >   next_date  = start_date+i
> >   app_d <- rbind(agg_d_h, c(next_date, 0) )
> > }
> >
> > gives:
> > Error in as.Date.numeric(value) : 'origin' must be supplied
> >
> > Thank you for your time to help me!
> >
> > Frederik Feys
> >
> > ______________________________________________
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> > https://stat.ethz.ch/mailman/listinfo/r-help <https://stat.ethz.ch/mailman/listinfo/r-help>
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html <http://www.r-project.org/posting-guide.html>
> > and provide commented, minimal, self-contained, reproducible code.
>
>
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>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> and provide commented, minimal, self-contained, reproducible code.



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