[datatable-help] A good way of using data.table with a date index

[Chris Neff]

Never would have found that on my own.  Could there possibly be a way to try
that in the type coercion when a key gets set that is a date, time, or
datetime class? I see no reason why key(x) = "date" should fail if all the
things necessary to convert a date to something data.table is fine with
exists.

On 26 July 2011 15:03, Matthew Dowle <mdowle at mdowle.plus.com> wrote:

> Hi,
> How about ?IDateTime.
> Matthew
>
> On Tue, 2011-07-26 at 14:07 -0400, Chris Neff wrote:
> > Hi all,
> >
> >
> > I often have a date index in a data frame that I don't really care to
> > keep as a time series because I don't do any sort of smoothing or
> > anything, but I prefer to keep it as a date class (or POSIXct or
> > whatever) so I can do things like only get data past a certain date,
> > or so plots will format correctly.
> >
> >
> > I've found that any time I time to make a date class a key variable it
> > complains that it can't be converted to integer without losing
> > information. I've had to resort to saving them as factors and then
> > using as.POSIXct whenever i want them as dates, which is annoying and
> > error prone.
> >
> >
> > Does anyone have a better way? POSIXct supports all standard equality
> > functions, and (I'm pretty sure) you can just convert into unix
> > seconds without losing anything, so why does it complain?
> >
> >
> > -Chris
> > _______________________________________________
> > datatable-help mailing list
> > datatable-help at lists.r-forge.r-project.org
> >
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
>
>
>
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