Peter Kovacs <kpeter@inf.elte.hu> [Fri, 24 Apr 2009 12:23:53 +0200] rev 615
Exploit the changes of #190 in MCF test file (#234, #190)
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 24 Apr 2009 12:23:17 +0200] rev 614
Support LEQ and GEQ supply constraints in dimacs-solver (#234, #219)
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 24 Apr 2009 12:22:06 +0200] rev 613
Bug fix in NetworkSimplex (#234)
Alpar Juttner <alpar@cs.elte.hu> [Thu, 23 Apr 2009 10:44:35 +0100] rev 612
Fix usage of sqrt() (#268)
Alpar Juttner <alpar@cs.elte.hu> [Tue, 21 Apr 2009 15:18:54 +0100] rev 611
Merge and fix
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 17 Apr 2009 18:14:35 +0200] rev 610
Slightly modify the interface of Circulation and Preflow (#266)
in order to synchronize them to the interface of NetworkSimplex.
Circulation:
- The "delta" notation is replaced by "supply".
- lowerCapMap(), upperCapMap() are renamed to lowerMap() and upperMap().
- Value is renamed to Flow.
Preflow:
- Value is renamed to Flow.
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 17 Apr 2009 18:04:36 +0200] rev 609
Support >= and <= constraints in NetworkSimplex (#219, #234)
By default the same inequality constraints are supported as by
Circulation (the GEQ form), but the LEQ form can also be selected
using the problemType() function.
The documentation of the min. cost flow module is reworked and
extended with important notes and explanations about the different
variants of the problem and about the dual solution and optimality
conditions.
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 03 Apr 2009 18:59:15 +0200] rev 608
Support real types + numerical stability fix in NS (#254)
- Real types are supported by appropriate inicialization.
- A feature of the XTI spanning tree structure is removed to ensure
numerical stability (could cause problems using integer types).
The node potentials are updated always on the lower subtree,
in order to prevent overflow problems.
The former method isn't notably faster during to our tests.
Peter Kovacs <kpeter@inf.elte.hu> [Fri, 03 Apr 2009 13:46:16 +0200] rev 607
Separate types for flow and cost values in NetworkSimplex (#234)
Peter Kovacs <kpeter@inf.elte.hu> [Wed, 25 Mar 2009 21:37:50 +0100] rev 606
Support multiple run() calls in NetworkSimplex (#234)
Peter Kovacs <kpeter@inf.elte.hu> [Wed, 25 Mar 2009 15:58:44 +0100] rev 605
Rework the interface of NetworkSimplex (#234)
The parameters of the problem can be set with separate functions
instead of different constructors.
Peter Kovacs <kpeter@inf.elte.hu> [Tue, 24 Mar 2009 00:18:25 +0100] rev 604
Use XTI implementation instead of ATI in NetworkSimplex (#234)
XTI (eXtended Threaded Index) is an imporved version of the widely
known ATI (Augmented Threaded Index) method for storing and updating
the spanning tree structure in Network Simplex algorithms.
In the ATI data structure three indices are stored for each node:
predecessor, thread and depth. In the XTI data structure depth is
replaced by the number of successors and the last successor
(according to the thread index).