HISTORY.cdd

cdd+ HISTORY file    (as of August 19, 2003)

*** cdd+ version (date) / changes ***

cdd+ Version 0.77 (August 19, 2003) /
   This is a minor bug fix version of the previous version.  Namely,
   the dual simplex method might cycle in the Phase I, although it
   is rather rare.   The fix is for the options "vertex_listing"
   and "facet_listing" which run the dual simplex as a default but
   switches to the criss-cross method when it generates too many pivots.
   The cycling examples were reported by Boryeu Mao (bmao@Raven.pnu.com).
   This version can be compiled with gcc-3.1.* or gcc-3.2.*.  The earlier
   version gcc-2.95.* is not compatible with this release.

cdd+ Version 0.76 (March 17, 1999) /
   This is functionally the same as Ver. 075.  This version can
   be compiled to run with GNU's GMP rational arithmetic library using
   Polymake's GMP-wrappers.  cddr+ with GMP runs much faster than
   the previous versions of cddr+ (with g++ Rational library). 

cdd+ Version 0.75 (November 30, 1997) /
   This is a maintenance update of the previous version to employ the 
   new 1997 Polyhedra format (introducing H-representation and
   V-representation statements).  Three options for accuracy control
   is added: "zero_tolerance", "round_output_off" and "output_digits".

cdd+ Version 0.74 (June 17, 1996) /
   Few minor bug fixes were made.

cdd+ Version 0.74beta2 (June 5, 1996) /
   Also "vertex_listing_external" and "facet_listing_external"
   are added.  These options do "vertex_listing" and "facet_listing"
   against the external file which can be huge.  These options are
   useful when one has a small candidate set of vertices (or inequalities)
   and a large set of perhaps-redundant points (or inequalities).
   The external file must be named as "test.ext.external" (test.ine.external)
   if the candidate input file is test.ext (test.ine).

cdd+ Version 0.74beta (June 4, 1996) /
   The option "vertex_listing" is added.
   The dual simplex method uses the standard Phase I instead of 
   the criss-cross method. Consequently the LP code is faster.

cdd+ Version 0.74alpha (March 30, 1996) /
   The default output file names have been changed to be consistent
   with the transformation.  To avoid confusion, *.ine file should
   be used only for a system of linear inequalities, and *.ext file
   only for a set of extreme points and rays.  Accordingly,
   the files *.ead (previously *.adj) and *.ecd (previously *.icd)
   are reserved for the adjacency and incidence files for the extremal
   vertices/rays.   
   Similarly, *.iad (previously *.iad) and *.icd (previously none)
   are reserved for the adjacency and incidence files for the inequality
   data.

   Also, when a file with default file name exists in the current
   directory, the default extension name will be doubled.  For instance,
   if test.ine is input and test.ext exists, then the extreme points
   and rays will be written in the file test.ext.ext.  The program
   does not check "test.ext.ext" exists, and thus such a file
   will be overwritten if exists.

cdd+ Version 0.73 (Septembe 6, 1995) /
   A new option "input_adjacency" has been added.
   The output format of incidence file is slightly modified. (See
   the Reference Manual cddman.tex).  This incidence file format is compatible
   with cdd-056 and we will try not to change the format any more.

cdd+ Version 0.72a (April 16, 1995) /
   Cycling bug of Version 072 of LP maximize and minimize has been 
   fixed.
cdd+ Version 0.72 (April 16, 1995) /
   The option "postanalysis" is added. This option is to be used 
   after *.ext file is obtained.  When this option is set
   with adjacency and/or incidence options, one can get
   adjacency and incidence files from both *.ine and *.ext
   files.  Thus it is not necessary to generate *.adj and *.icd
   files together with *.ext file. 

cdd+ Version 0.71 (April 15, 1995) /
   Two new functions (through options) are added.  The option 
   "facet_listing" checks whether each input inequality determines
   a facet or not.  The second option "tope_listing" generates
   all full-dimensional regions (topes) of the associated
   arrangement of hyperplanes by reverse search algorithm. 
   Also, the option "show_tableau" is added to illustrate
   how the criss-cross method works in the tableau (dictornary)
   form.  Criss-cross LP solver is now sensitive to ordering
   options, lexmin, minindex, radom, etc.

  cdd+ Version 0.70 (April 3, 1995) /
   The first C++ version of cdd which can run on both floating-point
   and rational (exact) arithmetics.  The basic functions are
   identical to cdd-055.  This version requires GNU gcc compilers
   (2.6.0 or higher) and a compatible g++lib.


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