[datatable-help] Change in list( ) behavior inside join

[Matt Dowle]

Thanks, now runs.  That is a bug in v1.9.2 which is fixed in v1.9.3 (I 
ran it to check),  from NEWS :

   o  When joining to fewer columns than the key has, using one of the 
later key columns
      explicitly in j repeated the first value. A problem introduced by 
v1.9.2 and not
      caught by our 1,220 tests, or tests in 37 dependent packages. Test 
added. Many
      thanks to Michele Carriero for reporting.
        DT = data.table(a=1:2, b=letters[1:6], key="a,b")    # keyed by 
a and b
        DT[.(1), list(b,...)]    # correct result again (joining just to 
a not b but using b)

Matt


On 25/03/14 13:51, Shir Levkowitz wrote:
> Sorry about that! dt.classEx should just be dt.hrEx… Full corrected 
> example below. Also you are correct 3.0.2 is the R version, not 3.2.0.
> Shir
>
> -----
>
>
> library(data.table)
>
> # dates
> dt.dateEx <- data.table(date = as.character(seq(as.Date('2014-04-01'), 
> as.Date('2014-04-15'), by = 1)))
> setkey(dt.dateEx, date)
>
> # hours
> dt.hrEx <- copy(dt.dateEx)
> dt.hrEx <- dt.hrEx[,  list(hour_beginning =0:23), by = list(dt = 
> date)] # rep x24 per date
> setkey(dt.hrEx, dt, hour_beginning)
>
> # as expected
> dt.hrEx[dt.dateEx][, list(dt, hour_beginning)]
>
> # not expected outcome
> dt.hrEx[dt.dateEx, list(hour_beginning)]
>
>
>
>
>
>
> On Mar 25, 2014, at 9:45 AM, Matt Dowle <mdowle at mdowle.plus.com 
> <mailto:mdowle at mdowle.plus.com>> wrote:
>
>>
>> Shir is using v1.9.2 though, although in R 3.2.0 apparently which 
>> might mean R 3.0.2 perhaps.
>> Anyway regardless of versions, the example code results in errors.  Shir?
>>
>> > # dates
>> > dt.dateEx <- data.table(date = 
>> as.character(seq(as.Date('2014-04-01'), as.Date('2014-04-15'), by = 1)))
>> > setkey(dt.dateEx, date)
>> >
>> > # hours
>> > dt.hrEx <- copy(dt.dateEx)
>> > dt.hrEx <- dt.hrEx[,  list(hour_beginning =0:23), by = list(dt = 
>> date)] # rep x24 per date
>> > setkey(dt.hrEx, dt, hour_beginning)
>> >
>> > # as expected
>> > dt.classEx[dt.dateEx][, list(dt, hour_beginning)]
>> Error: object 'dt.classEx' not found
>> >
>> > # not expected outcome
>> > dt.classEx[dt.dateEx, list(hour_beginning)]
>> Error: object 'dt.classEx' not found
>> >
>>
>>
>>
>>
>> On 24/03/14 19:57, Eduard Antonyan wrote:
>>> You're probably expecting the by-without-by behavior - see this 
>>> post: 
>>> http://r.789695.n4.nabble.com/by-EACHI-and-related-please-check-ok-td4686732.html 
>>> and follow the links within for more detail.
>>>
>>>
>>> On Mon, Mar 24, 2014 at 2:37 PM, Shir Levkowitz 
>>> <levkowitz at dc-energy.com <mailto:levkowitz at dc-energy.com>> wrote:
>>>
>>>     It looks like the latest version of data.table has changed the
>>>     behavior of list( ) inside of a join - is this behavior as
>>>     expected? Has anyone reported or encountered this change? It
>>>     seems like a bug to me. I am using data.table v1.9.2 in R 3.2.0 .
>>>
>>>     Thanks,
>>>     Shir Levkowitz
>>>
>>>
>>>
>>>
>>>
>>>     #-----------------------------------------------
>>>
>>>
>>>     library(data.table)
>>>
>>>     # dates
>>>     dt.dateEx <- data.table(date =
>>>     as.character(seq(as.Date('2014-04-01'), as.Date('2014-04-15'),
>>>     by = 1)))
>>>     setkey(dt.dateEx, date)
>>>
>>>     # hours
>>>     dt.hrEx <- copy(dt.dateEx)
>>>     dt.hrEx <- dt.hrEx[,  list(hour_beginning =0:23), by = list(dt =
>>>     date)] # rep x24 per date
>>>     setkey(dt.hrEx, dt, hour_beginning)
>>>
>>>     # as expected
>>>     dt.classEx[dt.dateEx][, list(dt, hour_beginning)]
>>>
>>>     # not expected outcome
>>>     dt.classEx[dt.dateEx, list(hour_beginning)]
>>>
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>>
>

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