Xpress Update 8.4.8

Document created by zsoltcsizmadia@fico.com on May 15, 2018
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Xpress Update 8.4.8 is now available on Box.com for Windows, Linux and Mac, from

 

              https://fico.box.com/v/xpress-8-4-8

 

This is the latest update for the Xpress 8.4 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.4 and requires a valid Xpress 8.4 license.

 

Release Notes:

 

Xpress Optimizer 32.01.11:

 

* Fixed an issue that caused local search heuristics to be run too early in opportunistic mode.

* MIPSTATUS will be set to XPRS_MIP_UNBOUNDED for an unbounded problem, even when feasible integer solutions have been found.

* Fixed an issue in XPRSchgmqobj when applied to a scaled problem.

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

* Fixed some leaks in the dot product implementation of the Python interface.

* Fixed an issue in the Python interface when reading multiple times a problem from a file.

 

Xpress Nonlinear 32.01.11:

 

* Improved automatic step bound size recovery for infeasible iterations. 

* Fixed an issue related to solving linear problems in the presence of a DRCOLTOL callback.

* XSLP_MIPALGORIHTM bit 1 (resolve final SLP to convergence) now works for pure MIP problems as well.

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