[datatable-help] indexing with nomatch=0

[Steve Lianoglou]

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
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>>
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>
>
>
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--
Steve Lianoglou
Computational Biologist
Department of Bioinformatics and Computational Biology
Genentech