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

[Shir Levkowitz]

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> 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> 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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