Set operations for messy dates

Performs intersection (md_intersect()) and union (md_union()) on, inter alia, messy date class objects. For a more typical 'join' that retains all elements, even if duplicated, please use md_multiset.

md_intersect(...)

md_union(x, y)

md_multiset(x, y)

Arguments

x, y, ...

Messy date or other class objects

Value

A vector of the same mode for intersect, or a common mode for union.

Functions

• md_intersect(): Find intersection of sets of messy dates

• md_union(): Find union of sets of messy dates

• md_multiset(): Join two sets of messy dates

Examples

md_intersect(as_messydate("2012-01-01..2012-01-20"),as_messydate("2012-01"))
#>  [1] "2012-01-01" "2012-01-02" "2012-01-03" "2012-01-04" "2012-01-05"
#>  [6] "2012-01-06" "2012-01-07" "2012-01-08" "2012-01-09" "2012-01-10"
#> [11] "2012-01-11" "2012-01-12" "2012-01-13" "2012-01-14" "2012-01-15"
#> [16] "2012-01-16" "2012-01-17" "2012-01-18" "2012-01-19" "2012-01-20"
md_union(as_messydate("2012-01-01..2012-01-20"),as_messydate("2012-01"))
#>  [1] "2012-01-01" "2012-01-02" "2012-01-03" "2012-01-04" "2012-01-05"
#>  [6] "2012-01-06" "2012-01-07" "2012-01-08" "2012-01-09" "2012-01-10"
#> [11] "2012-01-11" "2012-01-12" "2012-01-13" "2012-01-14" "2012-01-15"
#> [16] "2012-01-16" "2012-01-17" "2012-01-18" "2012-01-19" "2012-01-20"
#> [21] "2012-01-21" "2012-01-22" "2012-01-23" "2012-01-24" "2012-01-25"
#> [26] "2012-01-26" "2012-01-27" "2012-01-28" "2012-01-29" "2012-01-30"
#> [31] "2012-01-31"
md_multiset(as_messydate("2012-01-01..2012-01-20"),as_messydate("2012-01"))
#>  [1] "2012-01-01" "2012-01-02" "2012-01-03" "2012-01-04" "2012-01-05"
#>  [6] "2012-01-06" "2012-01-07" "2012-01-08" "2012-01-09" "2012-01-10"
#> [11] "2012-01-11" "2012-01-12" "2012-01-13" "2012-01-14" "2012-01-15"
#> [16] "2012-01-16" "2012-01-17" "2012-01-18" "2012-01-19" "2012-01-20"
#> [21] "2012-01-01" "2012-01-02" "2012-01-03" "2012-01-04" "2012-01-05"
#> [26] "2012-01-06" "2012-01-07" "2012-01-08" "2012-01-09" "2012-01-10"
#> [31] "2012-01-11" "2012-01-12" "2012-01-13" "2012-01-14" "2012-01-15"
#> [36] "2012-01-16" "2012-01-17" "2012-01-18" "2012-01-19" "2012-01-20"
#> [41] "2012-01-21" "2012-01-22" "2012-01-23" "2012-01-24" "2012-01-25"
#> [46] "2012-01-26" "2012-01-27" "2012-01-28" "2012-01-29" "2012-01-30"
#> [51] "2012-01-31"