Xpress Update 8.11.2

Community Manager

5 years ago

Xpress Update 8.11.2 is now available for Windows, Linux and Solaris, from

https://clientarea.xpress.fico.com/download_patch.php#8112

Due to technical issues, a Mac build of this patch will be made available at a later date.

This is the latest update for the Xpress 8.11 release branch. Please note that the Windows, Linux or Solaris archives must be extracted over a prior installation of FICO Xpress 8.11. This patch requires an Xpress 8.11 license.

Release Notes:

New in Release 8.11.2

Xpress Optimizer 37.01.03

A new solver interface to the statistical computing language R. It supports the full functionality offered by the Optimizer callable library. The R package is available in the MacOS, Linux, and Windows 64bit installers in the new R subdirectory, for example, C:\xpressmp\R. Please refer to the PDF manual therein for more information, and INSTALL.txt for installation instructions. This R package is currently in a BETA state and pre-built binaries are only available for Windows for R versions 3.3 and 3.4. For Linux, MacOS and other versions of R for Windows, please follow the INSTALL.txt instructions.
It is now possible to use Barrier without crossover in the sifting algorithm. If SIFTSWITCH is set to a non-negative number and CROSSOVER=0 then Barrier without crossover will be used for the entire sifting algorithm and the final solution is returned without a basis.

New in Release 8.11.1

Xpress Mosel 5.4.1

mmodbc 3.8.2

New SQLite function 'donullifspecial'.

mmsystem 2.8.2

Posix: 'system' to interrupt its subprocess even when it ignores SIGTERM.

r 1.1.03

Support for linking with R v4.x.

s3 0.1.0

Allow access to solution revision bucket when running within Insight 4.55+/Executor 3.0.6+
Introduced new s3solutiondata function as recommended way to request solution data bucket from s3init

dmp 1.1.1

Allow access to additional DMP Manager endpoints relating to solution revisions, when running within Inisght 4.55+/Executor 3.0.6+
Allow access to additional DMP WebService endpoints for requesting Swagger spec and function error log, when running within Insight 4.55+/Executor 3.0.6+

Fixed in Release 8.11.1

Xpress Optimizer 37.01.02

XPRS_PRIMALOPS is now accessible from .NET.
A new control NETSTALLLIMIT has been introduced for specifying the stalling limit of the network simplex algorithm.
When attempting to restore an incompatible saved state file, the Optimizer will now issue an error instead of crashing.
Fixed a potential crash in symmetry reductions.
Fixed an issue where maxmemoryhard would not have been taken into account when setting the tree memory target.
Fixed a potential issue with quadratic strong branching.
Stop fractionality reduction when primal simplex is cycling
Fixed an issue that could lead to wrong results for semi-continuous and partial integer variables in specific structures.
Fixed a performance issue with using primal simplex to clean up after network simplex.
Fixed an issue with running parallel heuristics during the branch-and-bound tree search.
Fixed an issue with the parallel component solver that could result in a non-optimal solution being returned.
New control SERIALIZEPREINTSOL that, when set to 1, will ensure that the preintsol callback is always fired in a deterministic order during a multi-threaded MIP solve.
New control COMPUTEJOBPRIORITY for setting priority of Insight Compute jobs (Insight 5.1+ only)
Fixed an issue that could cause optimization functions to not return when a remote job was cancelled on the Insight Compute server.
Changed behaviour so optimizations will not fail when the Insight Compute server does not signal run log completion.
XPRS_PRIMALOPS is now accessible from .NET.
A new control NETSTALLLIMIT has been introduced for specifying the stalling limit of the network simplex algorithm.
Fixed an issue with the parallel component solver that could result in wrong bounds.

Xpress Nonlinear 37.01.02

Fixed an issue related to retrieving solutions to nonconvex quadratic problems after nonlinear postsolve.

Xpress Mosel 5.4.1

Compiler Library

Line counter is no longer corrupted when using '\' as the last character of a line of a text string.

mmsystem 2.8.2

Negative values are now properly handled by 'datetime(v)'.

r 1.1.03

workaround for R v4.x issue with UTF8 in/out sequences incorrectly added in embedded mode.

Xpress Kalis 13.0.1

Added propagation algorithm choice in 'cumulative' constraint.
Fixed an issue when using 'cumulative' constraint without the scheduling objects (tasks and resources).

Updated 5 years ago

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