protocol

combinations_protocol

Protocol for combinations operations over lists.

Availability:
logtalk_load(combinations(loader))
Author: Paulo Moura
Version: 1:0:0
Date: 2026-02-26
Compilation flags:
static
Dependencies:
(none)
Remarks:
(none)
Inherited public predicates:
(none)

Public predicates

combinations/3

Generates all K-element combinations of a list.

Compilation flags:
static
Template:
combinations(K,List,Combinations)
Mode and number of proofs:
combinations(+integer,+list,-list) - one

combination/3

True iff the third argument is a K-element combination of a list.

Compilation flags:
static
Template:
combination(K,List,Combination)
Mode and number of proofs:
combination(+integer,+list,-list) - one_or_more

combinations/4

Generates all K-element combinations with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
combinations(K,List,Order,Combinations)
Mode and number of proofs:
combinations(+integer,+list,+atom,-list) - one

combination/4

True iff the fourth argument is a K-element combination with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
combination(K,List,Order,Combination)
Mode and number of proofs:
combination(+integer,+list,+atom,-list) - one_or_more

combinations_with_replacement/3

Generates all K-element combinations with replacement.

Compilation flags:
static
Template:
combinations_with_replacement(K,List,Combinations)
Mode and number of proofs:
combinations_with_replacement(+integer,+list,-list) - one

combinations_with_replacement/4

Generates all K-element combinations with replacement with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
combinations_with_replacement(K,List,Order,Combinations)
Mode and number of proofs:
combinations_with_replacement(+integer,+list,+atom,-list) - one

combination_with_replacement/3

True iff the third argument is a K-element combination with replacement.

Compilation flags:
static
Template:
combination_with_replacement(K,List,Combination)
Mode and number of proofs:
combination_with_replacement(+integer,+list,-list) - one_or_more

combination_with_replacement/4

True iff the fourth argument is a K-element combination with replacement with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
combination_with_replacement(K,List,Order,Combination)
Mode and number of proofs:
combination_with_replacement(+integer,+list,+atom,-list) - one_or_more

distinct_combinations/3

Generates all distinct K-element combinations of a list (deduplicating equal-valued combinations).

Compilation flags:
static
Template:
distinct_combinations(K,List,Combinations)
Mode and number of proofs:
distinct_combinations(+integer,+list,-list) - one

distinct_combination/3

True iff the third argument is a distinct K-element combination of a list.

Compilation flags:
static
Template:
distinct_combination(K,List,Combination)
Mode and number of proofs:
distinct_combination(+integer,+list,-list) - one_or_more

distinct_combinations/4

Generates all distinct K-element combinations with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
distinct_combinations(K,List,Order,Combinations)
Mode and number of proofs:
distinct_combinations(+integer,+list,+atom,-list) - one

distinct_combination/4

True iff the fourth argument is a distinct K-element combination with the given order: default, lexicographic, or shortlex.

Compilation flags:
static
Template:
distinct_combination(K,List,Order,Combination)
Mode and number of proofs:
distinct_combination(+integer,+list,+atom,-list) - one_or_more

nth_combination/4

Returns the combination at a given zero-based index.

Compilation flags:
static
Template:
nth_combination(K,List,Index,Combination)
Mode and number of proofs:
nth_combination(+integer,+list,+integer,-list) - zero_or_one

combination_index/4

Returns the zero-based index of a combination.

Compilation flags:
static
Template:
combination_index(K,List,Combination,Index)
Mode and number of proofs:
combination_index(+integer,+list,+list,-integer) - zero_or_one

count_combinations/3

Counts the number of K-element combinations of a list.

Compilation flags:
static
Template:
count_combinations(K,List,Count)
Mode and number of proofs:
count_combinations(+integer,+list,-integer) - one

count_combinations_with_replacement/3

Counts the number of K-element combinations with replacement of a list.

Compilation flags:
static
Template:
count_combinations_with_replacement(K,List,Count)
Mode and number of proofs:
count_combinations_with_replacement(+integer,+list,-integer) - one

random_combination/3

Returns a random K-element combination of a list.

Compilation flags:
static
Template:
random_combination(K,List,Combination)
Mode and number of proofs:
random_combination(+integer,+list,-list) - zero_or_one

Protected predicates

(none)

Private predicates

(none)

Operators

(none)