News for Package relations

Changes in version 0.6-13

• No user-level changes.

Changes in version 0.6-12

• No user-level changes.

Changes in version 0.6-11

• No user-level changes.

Changes in version 0.6-10

• No user-level changes.

Changes in version 0.6-9

• No user-level changes.

Changes in version 0.6-8

• No user-level changes.

Changes in version 0.6-7

• relation_dissimilarity(), relation_consensus() and relation_choice() gain methods for generalized paired comparison dissimilarities (which include symdiff, CKS, and Emond-Mason dissimilarities as special cases).

• relation_is() meta-predicate function added, to replace the current single predicate functions in future releases.

• is.na method for relations added.

Changes in version 0.6-6

• No user-level changes.

Changes in version 0.6-5

• Safeguard code against nchar(NA) being NA.

Changes in version 0.6-4

• Rd improvements.

Changes in version 0.6-3

• Improve namespace and avoid search path semantics.

• Improve message strings.

Changes in version 0.6-2

• Package metadata improvements.

Changes in version 0.6-1

• Rd improvements.

Changes in version 0.6

• Code added for computing (weakly/strongly) connected components, condensations and component representations.

• transitive_reduction() and the plot method for relations now also work for cyclic relations.

• The plot method for relations now also allows the drawing of “raw” graphs without any transformation.

Changes in version 0.5-11

• Bug in transitive_reduction() fixed.

Changes in version 0.5-10

• Vignette fixes.

• Package news converted to Rd format.

Changes in version 0.5-9

• Add predicates for (a)cyclic relations.

• Fix incorrect transitive_reduction() code.

Changes in version 0.5-8

• Ensure that examples do not fail when package Rgraphviz is unavailable.

Changes in version 0.5-7

• support for finding up to n consensus relations added for most methods.

Changes in version 0.5-5

• mean() method added for relation ensembles.

• Jaccard dissimilarity added.

• relation_precursors() added.

• support for missings added.

• relation_choice() gains a method for computing Euclidean choices and Schulze Winners.

• relation_impute() added with methods for linear, weak, and partial orders.

Changes in version 0.5-4

• Rd fixes.

Changes in version 0.5-3

• Adjust for recent changes in package clue.

Changes in version 0.5-2

• Sparse lightweight array and matrix code moved to package slam.

Changes in version 0.5-1

• Rd fixes.

Changes in version 0.5

• New relation_consensus() method for Cook-Kress-Seiford (CKS) dissimilarity.

• New symdiff fitters for consensus preorders, and family ‘⁠G⁠’ for general crisp endorelations.

• Performance enhancements for finding all symdiff consensus solutions, and symdiff consensus for equivalences or weak orders with a given number of classes.

• relation_choice() gains a method for CKS dissimilarity, and a weights argument.

• Performance enhancements for symdiff choice via employing a more compact linearization of the underlying binary quadratic program (BQP).

• GLPK is now used as the default MILP solver.

• Consensus and choice fitters now use sparse constraint matrices by default.

• New class for representing rankings.

• Improvements for plotting relations and relation ensembles.

• New function relation_cover() for computing the covering relation of an endorelation.

• New function relation_trace() for computing the left or right trace of an endorelation.

• New simple choice function relation_elements() for determining the minimal, first, last or maximal elements of an endorelation.

• New predicate relation_is_quasitransitive().

Changes in version 0.4

• symdiff fitters can now use the GLPK, SYMPHONY and CPLEX solvers in addition to lp_solve, and optionally use sparse constraint matrices

• more methods added to relation_violations(). optionally, return all tuples violating a property.

• relation_scores() now also works for relation ensembles

• Transitive/reflexive closure and reduction functions are now available as methods for closure and reduction generics (provided by package sets)

• During creation of relations, domains are converted to sets and incidences are canonicalized to match the internal order of the domain

• relation_consensus() can now compute all solutions for the Condorcet method, and gains a ‘majority’ method

• subassignment method for ensembles added

• set_intersection() accepts any number of arguments

• as.relation() generic now has a ... argument

• the attrs argument in plot.relation_ensemble() is now a list, so that the Rgraphviz parameters can be changed in each plot individually

• all.equal() methods added for relations and ensembles

Changes in version 0.3

• rank method is default for relation_scores()

• the relations in the SVM Benchmark data are now all reflexive

• support for sets moved to separate sets package

• support for fuzzy relations added

• fitters can now use a sparse constraint matrix representation

• new symdiff fitters for the S ("symmetric") and M ("matches") families

• relations are now subsettable

• fitters for Cook-Seiford method and Euclidean consensus added

• new summary() method for relations which computes all implemented predicates

• relation_choice() for choosing “winner” objects based on an ensemble of relations between these

Changes in version 0.2

• Copeland's method added to relation_consensus()

• relation_classes() added to extract and pretty-print (ordered) classes from preferences and equivalences.

• relation_violations() added to compute a measure of remoteness from a specified property (e.g., symmetry, transitivity, etc.)

• set_symdiff() fixed for more than two elements (used to compute the complement of the union and the intersection of a set, which is wrong in general). Now, the argument list is treated recursively.

• Vignette added

• New symdiff fitter added for the C ("complete") and A ("antisymmetric") families of relations

• Summary methods for tuples and sets added

• Ops and t() methods for the relation_ensemble class added

• plot.relation() fixed (used to plot the dual, now changes the graphviz layout)

• Ops.tuple() now correctly handles unary operators, and preserves class

• transform_incidences() added for transforming incidence matrices of endorelations from/to other codings found in literature

Changes in version 0.1

• Initial release