Functions to combine schedules using set operations.
also_occur(x, y) only_occur(x, y)
| x, y | Schedule objects. |
|---|
A schedule object.
also_occur() returns a schedule of events which includes all those
present in the first schedule (x) and all those present in the second
schedule (y). The resulting output is the union of the two schedules.
only_occur() returns a schedule of events which includes only those
present in both the first schedule (x) and in the second schedule
(y). The resulting output is the intersection of the two schedules.
Each function call is limited to two schedules. But more complex schedules
can be made by building schedules on top of one another. This process is
greatly eased by using the pipe operator (%>%) from the magrittr
package (see Examples).
library(magrittr, warn.conflicts = FALSE) on_christmas <- only_occur(on_mday(25), in_month("Dec")) schedule_days(on_christmas, from = 2000, to = 2004)#> [1] "2000-12-25" "2001-12-25" "2002-12-25" "2003-12-25" "2004-12-25"on_new_years_day <- on_yday(1) on_boxing_day <- on_mday(26) %>% only_occur(in_month("Dec")) on_public_holiday <- on_new_years_day %>% also_occur(on_christmas) %>% also_occur(on_boxing_day) schedule_days(on_public_holiday, from = 2000, to = 2004)#> [1] "2000-01-01" "2000-12-25" "2000-12-26" "2001-01-01" "2001-12-25" #> [6] "2001-12-26" "2002-01-01" "2002-12-25" "2002-12-26" "2003-01-01" #> [11] "2003-12-25" "2003-12-26" "2004-01-01" "2004-12-25" "2004-12-26"