[datatable-help] indexing with nomatch=0

[Gabor Grothendieck]

That is only relevant if nomatch=NA.

On Fri, May 3, 2013 at 7:00 PM, Steve Lianoglou
<lianoglou.steve at gene.com> wrote:
> On Fri, May 3, 2013 at 3:54 PM, Eduard Antonyan
> <eduard.antonyan at gmail.com> wrote:
>> There is no join'ing happening here, thus nomatch=0 has no effect.
>
> Indeed -- and the result is consistent with doing the same thing to a
> base::data.frame:
>
> R> df <- data.frame(a=letters[1:3])
> R> df[1:4,,drop=FALSE]
>      a
> 1 |  a
> 2 |  b
> 3 |  c
> NA| NA
>
> (my print.data.frame function is a monkey-patched version of the
> print.data.table function, which is why the output looks a bit
> different than what you'd likely to see)
>
> -steve
>
>
>
>>
>>
>> On Fri, May 3, 2013 at 5:52 PM, Gabor Grothendieck <ggrothendieck at gmail.com>
>> wrote:
>>>
>>> The definition of DT was left out by mistake.  It should be:
>>>
>>> DT <- data.table(a=letters[1:3])
>>>
>>>
>>> On Fri, May 3, 2013 at 6:50 PM, Gabor Grothendieck
>>> <ggrothendieck at gmail.com> wrote:
>>> > Consider this example:
>>> >
>>> >> DT[1:4,,nomatch=0]
>>> >     a
>>> > 1:  a
>>> > 2:  b
>>> > 3:  c
>>> > 4: NA
>>> >
>>> > Should it not return only the first 3 rows?  It seems to be ignoring
>>> > the nomatch=0.
>>> >
>>> > --
>>> > Statistics & Software Consulting
>>> > GKX Group, GKX Associates Inc.
>>> > tel: 1-877-GKX-GROUP
>>> > email: ggrothendieck at gmail.com
>>>
>>>
>>>
>>> --
>>> Statistics & Software Consulting
>>> GKX Group, GKX Associates Inc.
>>> tel: 1-877-GKX-GROUP
>>> email: ggrothendieck at gmail.com
>>> _______________________________________________
>>> 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
>>
>>
>>
>> _______________________________________________
>> 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
>
>
>
> --
> Steve Lianoglou
> Computational Biologist
> Department of Bioinformatics and Computational Biology
> Genentech



-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com