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Pack logtalk -- logtalk-3.98.0/library/permutations/NOTES.md

This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2026 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

permutations

This library provides predicates for generating and querying permutations over lists. The following categories of predicates are provided:

  • Generation operations - Predicates for generating permutations, k-permutations, and Cartesian products.
  • Ordering variants - Predicates that support an additional order argument (default, lexicographic, or shortlex) for controlling output order.
  • Distinct-value generation - Predicates for generating permutations while deduplicating equal-valued results.
  • Derangement operations - Predicates for generating and testing derangements.
  • Lexicographic stepping - Predicates for navigating permutations in lexicographic order.
  • Indexed access - Predicates for direct access to permutations at specific positions.
  • Counting operations - Predicates for counting permutations.
  • Random selection - Predicates for randomly selecting permutations. Dedicated combinations and subsequences libraries are also available for focused APIs on those operations.

API documentation

Open the [../../apis/library_index.html#permutations](../../apis/library_index.html#permutations) link in a web browser.

Loading

To load all entities in this library, load the loader.lgt file:

| ?- logtalk_load(permutations(loader)).

Testing

To test this library predicates, load the tester.lgt file:

| ?- logtalk_load(permutations(tester)).