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basic-relation (clj)
(source)variable
A function to determine the (basic) relation between two intervals.
Examples
tick
(ns tick.alpha.interval-test
(:require
[clojure.spec.alpha :as s]
[tick.core :as t]
[tick.protocols :as p]
[clojure.test
:refer [deftest is testing run-tests]
:refer-macros [deftest is testing run-tests]]
[tick.alpha.interval :as ti]
#?@(:cljs [[java.time :refer [Instant LocalDateTime LocalTime]]]))
#?(:clj
(:import [java.time LocalDateTime Instant LocalTime])))
(deftest basic-relations-test
(is (= (count ti/basic-relations) 13))
(is (distinct? ti/basic-relations)))
;; Distinct: because no pair of definite intervals can be related by more than one of the relationships.
;; From [ALSPAUGH-2009]
(deftest distinct-test
(is
(= [1] ; Each interval should have just one relation that is true
(distinct
(let [f (apply juxt ti/basic-relations)]
(for [x1 instants
x2 instants
y1 instants
y2 instants
:when (t/< x1 x2)
:when (t/< y1 y2)
:let [x (ti/new-interval x1 x2)
y (ti/new-interval y1 y2)]]
;; For each combination, count how many relations are true
;; (should be just one each time)
(count (filter true? (f x y)))))))))