Xpress Update 8.3.6

Document created by Michael.Perr on Nov 17, 2017
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Xpress Update 8.3.6 is now available on Box.com for Windows, Linux and Mac, from

 

              https://fico.box.com/v/xpress-8-3-6

 

This is the latest update for the Xpress 8.3 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.3 and requires a valid Xpress 8.3 license.

 

Release Notes:

 

Mosel 4.6.1:

 

  • xprmsrv
    • windows: server no longer reports unjustified timeouts when starting instances

 

Xpress-Optimizer 31.01.15:

 

  • Fixed an issue where creating ~8500 cones would trigger a crash in the Python interface.
  • Fixed issues where simplex solvers may wrongly declare numerical hard problems infeasible.
  • Ensure that all constraints without variables can be added with the Python interface.
  • Fixed a numerical issue with rounding heuristics for MIPs with SOS constraints that could result in a solve hanging.
  • Fixed a termination issue with a local search heuristic that could result in an "internal error" message.
  • Fixed a performance issue with diving heuristics that in some rare cases could trigger an unnecessarily long reoptimization solve.

 

Xpress-Nonlinear 31.01.15:

 

  • Improved barrier fallback strategy for numerically instable solves

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