SUBSET
Combinatorial Routines


subset, a Python code which enumerates, generates, randomizes, ranks and unranks combinatorial objects including combinations, compositions, Gray codes, index sets, partitions, permutations, polynomials, subsets, and Young tables. Backtracking routines are included to solve some combinatorial problems. Other routines handle continued fractions, Diophantine equations, and Pythagorean triples.

Combinatorial operations include the enumeration, generation, random selection, ranking and unranking of

Other objects considered include

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

subset is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

COMBO, a Python code which includes routines for ranking, unranking, enumerating and randomly selecting balanced sequences, cycles, graphs, Gray codes, subsets, partitions, permutations, restricted growth functions, Pruefer codes and trees.

KNAPSACK_01, a Python code which uses brute force to solve small versions of the 0/1 knapsack problem;

MONOMIAL, a Python code which enumerates, lists, ranks, unranks and randomizes multivariate monomials in a space of M dimensions, with total degree less than N, equal to N, or lying within a given range.

PARTITION_PROBLEM, a Python code which seeks solutions of the partition problem, splitting a set of integers into two subsets with equal sum.

POLYNOMIAL, a Python code which adds, multiplies, differentiates, evaluates and prints multivariate polynomials in a space of M dimensions.

SATISFY, a Python program which demonstrates, for a particular circuit, an exhaustive search for solutions of the circuit satisfiability problem.

SUBSET_SUM, a Python code which seeks solutions of the subset sum problem, in which it is desired to find a subset of a set of integers which has a given sum.

TOMS515, a Python code which can select subsets of size K from a set of size N. This is a version of ACM TOMS Algorithm 515, by Bill Buckles, Matthew Lybanon.

UBVEC, a Python code which demonstrates how unsigned binary vectors, strings of 0's and 1's, can represent nonnegative integers or subsets or other mathematical objects, for which various arithmetic and logical operations can be defined.

UNICYCLE, a Python code which considers permutations containing a single cycle, sometimes called cyclic permutations.

Source Code:

Not converted yet:

Examples and Tests:


Last revised on 17 October 2020.