[datatable-help] Subsetting that behaves right for both data frames and data.tables?

[Timothée Carayol]

Hi--

You can use the subset() command with the select= option; not sure it's the
best solution, though.

Timothee


On Wed, Jul 20, 2011 at 12:26 PM, Chris Neff <caneff at gmail.com> wrote:

> I have a function where I pass a data frame and some variable names to
> calculate statistics on. However, I am at a loss as to how to write it
> correctly so that both data.frame and data.table work with it. If I have:
>
> DF = data.frame(x=1:10,y=2:11,z=3:12)
>
> DT = data.table(DF)
>
> var.names = c("x","y")
>
>
> I can do the following things to subset:
>
> DT[,var.names,with=FALSE]
> DF[,var.names]
>
>
> but of course DT[,var.names] won't give me back what I want, and
> DF[,var.names,with=FALSE] returns an error because with doesn't exist there.
> So how do I do this?
>
> Thanks,
> -Chris
>
>
>
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