Release Notes
Each new release incorporates numerous fixes and improvements to the
core GAMS system and its many components. A selected list of
improvements and new components is given below.
If you are interested in receiving the latest information about new
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*** GAMS Beta *** Distribution 22.6 December 6, 2007 |
Acknowledgements
We would like to thank all of our users who have reported problems and made
suggestions for improving this release. In particular, we thank Michael
Ferris and Stefan Vigerske.
New Platforms
- Solaris on Sparc64 (64-bit)
- Mac on Intel (32-bit)
GAMS System
- Complete
detailed GAMS Release Notes
- Dollar Control Options
- Additional Licensing Information
- Put Writing Facility
- Enhanced Functions on controlling Sets
- Other Enhancements
- Unlimited input string length for $call, execute and put_utility exec/shell.
- The listing file can be redirected to the standard error stream by using the gams parameter ao=3
- The model attribute .numvarproj was added to count bound projections during model generation. Some minor additions to MODEL STATISTICS and an enhanced column listing help identify potential problems (the variable attribute .infeas could also be used to display potential bound projections)
- GAMS IDE:
- GDXviewer supports Excel 2007 format xlsx
- GDXviewer has an integrated symbol search
- GAMS Model library: New models
- Asynchronous Jacobi Methods (jacobi)
- Dantzig Wolfe Decomposition and Grid Computing (danwolfe)
- Portfolio Modeling with Parallel Solutions (qmeanvag)
- Cplex Solution Pool for a Simple Facility Location Problem (solnpool)
- Mission Planning for Synthetic Aperture Radar Surveillance (swath)
- TSP tour plotting with LaTeX xy-pic environment (tsp2ltx)
- Min Cost Flow with an Instance generated by NETGEN (netgen)
- GDXXRW
- Supports Excel 2007 format xlsx
- GDX2HAR/HAR2GDX
- GAMS distributes and supports utilities for converting HAR
(header array) files used by GEMPACK: gdx2har and
har2gdx. Details about these utilities can be found at Tom
Rutherford's page here.
Solvers
- AlphaECP:New libraries (version 1.44). AlphaECP can call an NLP solver during the optimization to quickly find integer solutions.
- BARON:New libraries (version 8.1.1). XPRESS is available as a subsolver for LPs (option "lpsol=7"). Identification of common linear subexpressions in nonlinear functions that speeds up BARON's parsing time considerably for certain problems.
- COIN-OR Solvers:New solver libraries of CBC/CLP (2.0), GLPK (4.22), IPOPT (3.3), BONMIN (0.9). The GAMS/CoinCBC link has been completely rewritten so that it offers the performance of the CBC standalone version. Many new options have been added. The GAMS/CoinGLPK link uses now the advanced B&B solver of GLPK. Support of Solaris 64bit Intel platform (SIG) and MacOS on Intel chips (DII).
- CPLEX:New libraries (11.0). There are quite a few
changes in Cplex 11 and the GAMS/CPLEX interface. Please check the
detailed GAMS/CPLEX 11 release notes. The major
enhancements are:
- Improved Mixed Integer Programming (MIP) Performance
- Enhanced Parallel MIP
- Multiple MIP Solutions
- Performance Tuning tool
- LINDOGLOBAL:New libraries (version 5.0.1.183). Support of Solaris Sparc64 platform (SOX) and Intel Mac (DII).
- MOSEK:New libraries (version 5.0.0.62). Support of Solaris Sparc64 platform (SOX) and MacOS on Intel chips (DII).
- XPRESS:New libraries (version 18.00)
For release notes of previous distributions, see
http://www.gams.com/docs/release/release.htm
