Remove a range in data.table

Question

I am trying to exclude some rows from a datatable based on, let\'s say, days and month - excluding for example summer holidays, that always begin for example 15th of June and en

Answer 1

Based on the answer here, you might try something like

# Sample data
DT <- data.table(Month = sample(c(1,3:12), 100, replace = TRUE),
  Day = sample(1:30, 100, replace = TRUE), key = "Month,Day")

# Dates that you want to exclude
excl <- as.data.table(rbind(expand.grid(6, 15:30), expand.grid(7, 1:15)))

DT[-na.omit(DT[excl, which = TRUE])]

If your data contain at least one entry for each day you want to exclude, na.omit might not be required.