[datatable-help] can one name a collection of columns by specifying just the first and the last column

[Chris Neff]

I don't like this idea. It adds extra that it doesn't need to.  Doing it
with column numbers is more straightforward, and if all you have is names
you can get numbers by doing match() or whatever and then getting the
sequence with seq(). Having a sequence of column names is odd.

On Tue Feb 10 2015 at 1:28:25 PM Arunkumar Srinivasan <aragorn168b at gmail.com>
wrote:

> Farrel,
>
> It could be useful. Please file an issue on the github project page.
> Thanks.
>
> --
> Arun
>
> On 10 Feb 2015 at 01:08:46, Farrel Buchinsky (fjbuch at gmail.com) wrote:
>
> So lets say one has a data.table with the following columns
>
> first.name, last.name, height, weight, shoe.size, eye.color, hair.length,
> appendage.size, ear.length
>
> If one wanted to just include weight through hair.length one would have to
> go something such as this
>
> dt[,list(weight, shoe.size, eye.color, hair.length)]
>
> Is there a way to do something along the lines of
>
> dt[,list(weight...hair.length)]
>
> If so, can you direct me to the documentation? If not can you build it? Is
> it difficult? Some data.tables have many columns.
>
> Thanking you in anticipation.
>
> Farrel
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