Xpress Update 8.5.1

Document created by zsoltcsizmadia@fico.com on May 25, 2018
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Xpress Update 8.5.1 is now available on Box.com for Windows, Linux and Mac, from

 

              https://fico.box.com/v/xpress-8-5-1

 

This is the latest update for the Xpress 8.5 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.5 and requires a valid Xpress 8.5 license.

 

Release Notes:

 

Xpress Optimizer 8.5.1 (33.01.03)

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* Fixed a problem in which XPRSchgmqobj would not have scaled the loaded quadratic coefficients correctly.

* Fixed a problem in the quadratic simplex method that could have resulted in solutions being cut off in strong branching and single dual pivots.

* Symmetry detection will now take less time for problems including symmetries on continuous variables only.

* Fixed an internal consistency error that could be triggered when running parallel heuristics during the tree search.

* Tightening SOSREFTOL should no longer trigger an internal error from local search heuristics.

 

Xpress Optimizer 8.5.1 (33.01.03)

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* Improved convergence criteria for mixed convex quadratic and nonlinear problems.

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