Dear useRs, it is our great pleasure to announce the new package "relations" to appear on all CRAN-mirrors soon.
This package provides data structures and methods for creating and manipulating relations, relation ensembles, sets, and tuples. The feature list includes: * creation of relations by domain and graph/characteristic function/incidences, * extraction of characteristic function and graph, * predicate functions for the most common standard characteristics, * operators known from relational algebra theory (such as projection, selection, cartesian product, joins, etc.), * transitive/reflexive reduction and closure of a relation, * relation ensembles for combining relations, * fitters for determining (possibly all) consensus relations of a relation ensemble including the Borda and Condorcet methods, as well as exact solvers for minimizing a criterion function based on the symmetric difference (Kemeny-Snell) metric. * a simple plot method for Hasse-diagrams using RGraphviz. Kurt and David _______________________________________________ R-packages mailing list [EMAIL PROTECTED] https://stat.ethz.ch/mailman/listinfo/r-packages ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
