Xpress Update 8.13.1 is now available for Windows, Linux, MacOS, and Solaris, by following this link.
This is the latest update for the Xpress 8.13 release branch. Please note that the Windows, Linux, or Solaris archives must be extracted over a prior installation of FICO Xpress 8.13. This patch requires an Xpress 8.13 license.
Release Notes:
Xpress Optimizer 39.01.02
Fixed an issue with IIS and presolve=-1 for general constraints that could lead to crashes in case of bound conflicts.
Fixed an issue with presolve eliminations on problems with very small coefficients that could lead to numerical instability.
Fixed an issue with Barrier crossover that could result in a subsequent primal simplex solve returning a suboptimal solution.
Fixed an issue with MIP presolving that could result in rows with a clique cover incorrectly being dropped.
Xpress Nonlinear 39.01.02
Fixed a problem that could cause a crash in Knitro.
Fixed a problem with mixing indicators or general constraints with nonlinear problems, which could produce incorrect solutions.
Xpress Solver Interfaces 39.01.02 (Python, R, Matlab, .NET, Java)
[Python] Fixed a problem where the Python module could hang when solving many problems simultaneously.
Xpress Mosel 5.8.1:
Runtime Library
NI function 'findident' no longer returns an invalid pointer when the requested symbol is a parameter of type 'boolean'.
An issue has been fixed in the parsing of invalid unicode sequences.
mmhttp 3.4.1
'jsonwrite'/'httpreplyjson': support for unions and constants of native types.
mmjobs 2.22.1
IO driver 'rmt:' now limits the maximum buffer size to 63k (as 64k is not supported by the underlying protocol).
mmreflect 0.0.3
'findident' now reports correct values when applied to model parameters.
mmxml 2.2.9
JSON reader: on Windows improved efficiency of reading of huge items.
Xpress Workbench 3.5.1
Trimmed excessively verbose logging
Updated 4 years ago
Version 3.0