Xpress patch release 8.1.3

Document created by Michael.Perr on Apr 21, 2017
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Xpress patch 8.1.3 is now available on Box for Windows 64 and 32, Linux 64 and 32 and Mac 64, from




Xpress-Optimizer 30.01.07 release notes:

  • Fixed an issue in the barrier that could result in degraded performance after warmstart.
  • Fixed a bug in the construction of linear and quadratic expressions in Python.
  • Added missing checks against time limit to the local search heuristics.
  • Fixed an issue in the connected component presolver for problems with very large objective values that in rare cases could result in the problem being declared infeasible.
  • Updated the Ampl-Xpress driver.


Xpress-Nonlinear 30.01.07 release notes:

  • Fixed an incorrect bound reduction in constraints with nonlinear and quadratic parts with at least one off-diagonal term.


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.