Xpress update release 8.1.6

Document created by zsoltcsizmadia@fico.com on Oct 3, 2017
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Xpress update 8.1.6 is now available on Box.com for Windows, Linux and Mac from




Xpress-Optimizer 30.01.10 release notes:


* Added support for Python 3.6.

* Fixed an issue with the simplex sifting algorithm for dualized problems.

* Fixed an issue with the tuner for maximization problems.

* Modified how heuristics are run before the initial LP relaxation solve of a MIP to avoid some expensive cases.

* New control HEURDIVEITERLIMIT to change the simplex iteration limit for the diving and rounding heuristics.


Xpress-Nonlinear 30.01.10 release notes:


* Further improved the numerical behaviour of quadratic problems.

* Fixed an issue in which XSLP_UNFINISHEDLIMIT was always used as value 1.


This is the latest Xpress update for the Xpress 8.1 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.1 and requires a valid Xpress 8.1 license.