Xpress Update 9.5.8

Community Manager

5 months ago

Xpress Updates 9.5.8 is now available on the client area for Windows, Linux, and MacOS on x86-64, and Linux and MacOS on AArch64, from

https://clientarea.xpress.fico.com/download_patch.php#958

This is the latest update for the Xpress 9.5 release branch, respectively, and require matching licenses. Please note that these archives must be extracted over a prior installation of FICO Xpress 9.5, respectively.

Release Notes for 9.5.8

Xpress Optimizer 44.01.08

Calling XPRSscale after solving a MIP should now scale the incumbent MIP solution correctly.
Fixed an issue where primal simplex could return a slightly infeasible solution.
Fixed an issue with an incorrect basis update in KKT simplex that could lead to a crash.
Fixed an issue in MIP presolve dual reductions that in some corner cases could lead to a wrong node cutoff during the branch-and-bound tree search.
Fixed an issue with the tuner that in some cases did not use its history.
Fixed a potential memory leak in primal KKT simplex.

Xpress Nonlinear 44.01.08

Fixed an issue in MISLP heuristics for problems with convex quadratic objective.
Fixed an issue with nonlinear eliminations in the presence of indicator constraints.

Xpress Interfaces 44.01.08 (Python, R, Matlab, .NET, Java, C++, C)