Use case to pick only observations related to last group
Take following dt:
dt <- data.table(group_id = c(1,1,1,2,2,2,3,3,3), val = rnorm(9))
This works in 1.9.3 but doesn't work in 1.9.4:
dt[group_id == max(group_id)]
As for now to achieve the following in 1.9.4 I need to do:
dt[group_id == max(dt$group_id)]
# or
dt[,.SD][,max_group_id:=max(group_id)][group_id == max_group_id][,max_group_id:=NULL][]
# [,.SD] - prevent write dt by reference
Is there any recommended (in terms of future support) way of achieve that?
Use case to pick only observations related to last group
Take following dt:
This works in 1.9.3 but doesn't work in 1.9.4:
As for now to achieve the following in 1.9.4 I need to do:
Is there any recommended (in terms of future support) way of achieve that?