The Basic Allen Relation Set
allen_relation_code(...)
allen_relation_string(...)
allen_relation_concurrent(...)
allen_relation_distinct(...)allen_relation_code() returns a character vector of one-letter codes
for the thirteen basic Allen relations.
allen_relation_string() returns a character vector of string
descriptors of the Allen basic relations.
allen_relation_concurrent() returns a character vector of nine
one-letter codes for the Allen concurrent relations.
allen_relation_distinct() returns the six value Allen relation set for
intervals with distinct endpoints.
The codes were proposed by Thomas Alspaugh.
Allen, J. F. (1983). Maintaining Knowledge about Temporal Intervals. Communications of the ACM, 26(11): 832-843. doi:10.1145/182.358434 .
Alspaugh, T. (2019). Allen's Interval Algebra. URL: https://thomasalspaugh.org/pub/fnd/allen.html.
Other Allen's intervals:
allen_analyze(),
allen_complement(),
allen_composition(),
allen_converse(),
allen_illustrate(),
allen_intersect(),
allen_joint_concurrency(),
allen_observe(),
allen_observe_frequency(),
allen_relation(),
allen_union()