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

[Chris Neff]

Yeah I realized that myself.

Another one: the function "with" doesn't seem to do what I want... but at
least it is consistent!

2011/7/20 Timothée Carayol <timothee.carayol at gmail.com>

> Sorry --
>
> subset() was a poor idea, as it will return a data.frame even if the
> argument is a data.table..
>
>
>
> 2011/7/20 Timothée Carayol <timothee.carayol at gmail.com>
>
>> 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
>>>
>>>
>>>
>>> _______________________________________________
>>> datatable-help mailing list
>>> datatable-help at lists.r-forge.r-project.org
>>>
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>>>
>>>
>>
>
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