Xpress Update 9.0.3

Community Manager

3 years ago

Xpress Update 9.0.3 is now available on https://clientarea.xpress.fico.com/download_patch.php#903 for Window, Linux and MacOS on x86-64 and Linux on AArch64.

This is the latest update for the Xpress 9.0 release branch. Please note that the Windows or Solaris archives must be extracted over a prior installation of FICO Xpress 9.0. This update requires an Xpress 9.0 license.

Release Notes:
Xpress Optimizer 41.01.04

Fixed a clash between Global and SLP control names that made tuning for (MI)SLPs not work
Fixed an issue that SLP tuner log files have not been exported
Fixed a problem with IIS computation on models that contain non-linear expressions or general constraints.
Nonlinear problems that were transformed into MIPs are now postsolved if infeasible.
New attribute OPTIMIZETYPEUSED indicates the solver that was selected by a call to XPRSoptimize.
On Linux the library no longer references the deprecated pthread_yield(). It now uses sched_yield() instead. On all other platforms it already used sched_yield() before.

Xpress Nonlinear 41.01.04

Fixed an issue when determining the correct algorithm to use for each objective when solving multi-objective nonlinear problems.
Fixed an issue when running nonlinear heuristics during multi-objective solves.
XSLPpostsolve now unconstructs the problem when PRESOLVE=0.

Xpress Solver Interfaces 41.01.04 (Python, R, Matlab, .NET, Java)

Fixed an out of memory problem in .NET and Java for problems that contain very long names or a lot of elements with names.
The Xpress Python interface requires NumPy 1.23.x or older due to a compatibility issue with later releases.
In Python, problems with nonlinear, piecewise linear or general constraints that were transformed into MIPs are now postsolved if infeasible.