After a long hiatus, I am back to using data.table. Unfortunately, I've encountered a problem. Am I doing something wrong here?
require(data.table) dt = data.table(idx = 1:100 %% 3, 1:100) dt[, list(sum(V2)), by = idx] # normal require(bit64) dt2 = data.table(idx = integer64(100) + 1:100 %% 3, 1:100) dt2[, list(sum(V2)), by = idx] # only has one group: # idx V1 #1: 1 5050
_______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
