[datatable-help] Unexpectedly getting "Didn't allocate enough rows..."

[Harish]

I am unexpectedly getting an error -- Didn't allocate enough rows. Must grow ans (to implement as we don't want default slow grow)


DT <- data.table(
         A=c("a","a","b","b","d","c","a","d"),
         B=c("x1","x2","x2","x1","x2","x1","x1","x2"),
         C=c(5,2,3,4,9,5,1,9)
         )
DT[ , list(C[ C-min(C) < 3 ]), by=list(A,B) ]    # Get error

DT[ , list(C[ C-min(C) < 5 ]), by=list(A,B) ]    # No error (as expected)


Am I doing something that I shouldn't be?


Harish