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

[Matt Dowle]

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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