net.sf.oriented.omi

Interface ChirotopeFactory

All Superinterfaces:

Factory<OMasChirotope>

public interface ChirotopeFactory
extends Factory<OMasChirotope>

Create Oriented Matroids from their Chirotope.

NB: This library uses co-lexicographic ordering, not lexicograpghic ordering. When using chirotopes from the literature you need to ensure that you know where they are using lexicographic like Bibliography.björnerEtAl1999 or co-lexicographic like Bibliography.finschi2001

Author:

jeremycarroll

Method Summary

Methods

Modifier and Type	Method and Description
OMasChirotope	construct(Chirotope chi) Create an oriented matroid from a chirotope provided programmatically.
OMasChirotope	construct(Collection<? extends Label> e, Chirotope chi) Create an oriented matroid from a chirotope provided programmatically, with given element labels.
OMasChirotope	fromCoLexicographic(int rank, String chi) Create an oriented matroid from its colexicographic representation as a series of +, -, 0s.
OMasChirotope	fromLexicographic(int rank, String chi) Create an oriented matroid from its lexicographic representation as a series of +, -, 0s.

Methods inherited from interface net.sf.oriented.omi.Factory

emptyCollectionOf, parse, parse, remake, toString

Method Detail

construct

OMasChirotope construct(Chirotope chi)

Create an oriented matroid from a chirotope provided programmatically. The element labels are generated automatically.

Parameters:

chi - This is accessed only in monotone increasing fashion, and is not assumed to be alternating

Returns:

A new oriented matroid

construct

OMasChirotope construct(Collection<? extends Label> e,
                      Chirotope chi)

Create an oriented matroid from a chirotope provided programmatically, with given element labels.

Parameters:

e - The elment labels taken in the order of their iterator.

chi - This is accessed only in monotone increasing fashion, and is not assumed to be alternating

Returns:

A new oriented matroid

fromCoLexicographic

OMasChirotope fromCoLexicographic(int rank,
                                String chi)

Create an oriented matroid from its colexicographic representation as a series of +, -, 0s. We also need to know its rank.

Parameters:

rank - The rank of the oriented matroid encoded in the chirotope

chi - The chirotope string, a sequence of + - or 0

fromLexicographic

OMasChirotope fromLexicographic(int rank,
                              String chi)

Create an oriented matroid from its lexicographic representation as a series of +, -, 0s. We also need to know its rank.

NB: this library uses colexicographic ordering throughout and lexicographic ordering is only available here, and at the two other listed methods.

Parameters:

rank - The rank of the oriented matroid encoded in the chirotope

chi - The chirotope string, a sequence of + - or 0

See Also:

fromLexicographic(int, String), FactoryFactory.fromLexicographic(int, int, String), OMasChirotope.toLexicographicString()