GOBLIN Graph Library 2.8 Beta 27

A C++ class library focussed on graph optimization and network programming problems.
GOBLIN Graph Library
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GOBLIN is a C++ class library focussed on graph optimization and network programming problems. GOBLIN Graph Library deals with all of the standard graph optimization problems discussed by textbooks and in courses on combinatorial optimization.

This software package also consists of a shell interpreter which extends the well-known Tcl/Tk language to graph objects and a graph browser and editor tool. Executable solvers are available for practical optimization problems. The graph browser applies for teaching and scientific documentation purposes.

GOBLIN is open source software and licenced by the GNU Lesser Public License (LGPL). That is, GOBLIN may be downloaded, compiled and used for scientific, educational and other purposes free of charge. For details, in particular the statements about redistribution and changes of the source code, observe the LGPL document which is attached to the package.

Today, GOBLIN provides strongly polynomial algorithms for the following graph optimization problems:

· Shortest paths in graphs and digraphs with negative lengths.
· Negative cycles and minimum mean cycles.
· Strong and 2-connected components.
· Minimum spanning trees, arborescences and 1-trees.
· Maximum st-flows, feasible circulations and b-flows.
· Min-cost st-flows, b-flows and circulations.
· Assignment problems of any kind.
· 1-matchings, b-matchings, capacitated b-matchings, f-factors and degree-constrained subgraphs.
· Directed and undirected Chinese postman problems, T-joins.

Main features:

  • The gosh interpreter extends the Tcl/Tk scripting language to graph objects in a natural way.
  • The goblet graph browser and editor tool. Graphical front end to the library.
  • An open class hierarchy which strictly separates between abstract classes (all mathematical algorithms are defined as methods of abstract classes), implementations (i.e. by incidence lists, adjacency matrices) and logical views (problem transformations).
  • A generic branch and bound module with several applications to graph optimization.
  • Logging and tracing functionality which allows to study the various algorithms by examples.
  • A runtime configuration module controls the selection of mathemetical methods, logging information, and the tracing of data objects.
  • Compile time configuration module for code optimization.
  • A file interface which can be easily extended to new problem classes.
  • Source code for executable solver programs.

last updated on:
February 13th, 2009, 15:36 GMT
license type:
LGPL (GNU Lesser General Public License) 
developed by:
Christian Fremuth-Paeger
ROOT \ Science and Engineering \ Visualization
GOBLIN Graph Library
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GOBLIN Graph Library
What's New in This Release:
  • This release addresses perfect graphs: a linear test for chordality and co-chordality has been added.
  • Constructors for permutation, threshold, and interval graphs are also available.
  • BFS, the max-flow code, and non-weighted matching code have been revised, and now operate on the node color register (integer) instead of the node distance labels.
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