Xpress Update 9.4.1

Community Manager

2 years ago

Xpress Update 9.4.1 is now available on box.com for Windows, Linux and Mac on x86-64, and Linux and Mac on AArch64, from

https://clientarea.xpress.fico.com/download_patch.php#941

These are the latest updates for the Xpress 9.4 release branch, and requires a matching license. Please note that these archives must be extracted over a prior installation of FICO Xpress 9.4.

Release Notes for 9.4.1

Xpress Optimizer 43.01.02

With numerical emphasis activated (i.e. with the NUMERICALEMPHASIS control set to any value greater than 0), a more careful numerical handling of cutting planes is applied to improve the numerical stability of some pathological models.
Fixed numerical issue in presolve reduction that can lead to incorrect results on extreme inputs.

Xpress Nonlinear 43.01.02

Fixed a potential issue when reading in problems with an explicit equalscolumn from .lp-files.
Fixed an issue where validationindices in the convergence callbacks could reflect a heuristic instead of the iteration solution.

Xpress Interfaces 43.01.02 (Python, R, Matlab, .NET, Java)

The Xpress solver libraries have been moved out of the main Python package (xpress) into a dependency package (xpresslibs). There are no changes to the installation procedure: the xpresslibs package will be downloaded and installed automatically by Pip and Conda.
In Conda environments, the Xpress solver libraries are now installed into the shared library folder: <env>\Library\bin on Windows, <env>/lib on macOS and Linux.