Sorry - haven't got to implementing grouping or keys for integer64 yet.
All that's been done is integer64 in fread. There's a bug item on the list.
Matthew
On 14/09/13 20:05, Harish wrote:
I am trying to use "by" on integer64 data and data.table seems to
think that there is only one value. This is reproduced with the
following:
library( data.table )
library( bit64 )
DT <- data.table( a=rep( 1:5, 2), b=15:24 )
DT[ , .N, by=a ]
DT[ , a := as.integer64( a ) ]
DT[ , .N, by=a ]
The output I get is:
> DT <- data.table( a=rep( 1:5, 2), b=15:24 )
> DT[ , .N, by=a ]
a N
1: 1 2
2: 2 2
3: 3 2
4: 4 2
5: 5 2
> DT[ , a := as.integer64( a ) ]
> DT[ , .N, by=a ]
a N
1: 1 10
Notice that the "by" after converting column "a" to integer64 is
different from before. However, the values of "a" are correct:
> DT$a
integer64
[1] 1 2 3 4 5 1 2 3 4 5
I am using the latest version of data.table from r-forge (1.8.11 Rev
965). I also had the same issue with 1.8.10 from CRAN.
Am I doing something wrong or is this a bug? Thanks for your help.
Regards,
Harish
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