Create a new set-based recurrence schedule
Often, a single rrule will be sufficient. However, more complex recurrence objects can be constructed by combining multiple rschedules into a recurrence set.
There are three types of recurrence sets provided in almanac, each of which construct their event sets by performing a set operation on the underlying events of the rschedules in the set.
runion() takes the union.rintersect() takes the intersection.rsetdiff() takes the set difference.runion(...) rintersect(...) rsetdiff(...)
...: [rschedules]
rschedule objects to add to the set.
A runion, rintersect, or rsetdiff.
For rsetdiff(), the event set is created "from left to right" and depends on the order that the rschedules were added to the set.
since <- "2019-04-01" until <- "2019-05-31" on_weekends <- weekly(since = since, until = until) %>% recur_on_weekends() on_25th <- monthly(since = since, until = until) %>% recur_on_day_of_month(25) # On weekends OR the 25th of the month ru <- runion(on_weekends, on_25th) alma_events(ru) # On weekends AND the 25th of the month ri <- rintersect(on_weekends, on_25th) alma_events(ri) # On weekends AND NOT the 25th of the month rsd1 <- rsetdiff(on_weekends, on_25th) alma_events(rsd1) # On the 25th of the month AND NOT the weekend rsd2 <- rsetdiff(on_25th, on_weekends) alma_events(rsd2)