Xpress Updates 9.0.7 and 9.1.1

Community Manager

3 years ago

Xpress Updates 9.0.7 and 9.1.1 are now available for Window and Linux on x86-64 and Linux on AArch64, from

https://clientarea.xpress.fico.com/download_patch.php#907
https://clientarea.xpress.fico.com/download_patch.php#911

These are the latest updates for the Xpress 9.0 and 9.1 release branches, respectively, and require matching licenses. Please note that these archives must be extracted over a prior installation of FICO Xpress 9.0 and 9.1, respectively.

Release Notes for both 9.0.7 and 9.1.1

Xpress Optimizer 41.01.08

MIP presolving should no longer create semi-continuous variables with a semi-continuous lower bound less than FEASTOL.
Fixed an issue with presolving of MIPs that could result in invalid constraints being created.
Fixed an issue when timing out during MIP presolving.
Fixed an issue when setting heurthreads!=0 that prevented a local search heuristic from terminating when a problem is solved to completion.
Fixed an issue with deleting indicator rows.
Fixed an issue for binary quadratic equality constraints.

Xpress Nonlinear 41.01.08

Fixed an issue with permuting nonlinear problems.
Fixed an issue with copying problems in a presolved state.
Fixed an issue where problems with some non-convex binary quadratic and some general non-convex quadratic constraints were incorrectly declared convex.

Xpress Solver Interfaces 41.01.08 (Python, R, Matlab, .NET, Java)

Added support for Python 3.11.
In Python, fixed a library conflict which could cause an error on Windows:
OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.

Xpress Mosel 6.2.2
dmp 1.4.1