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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