Xpress Update 8.8.8

Community Manager

5 years ago

Xpress Update 8.8.8

Xpress Update 8.8.8 is now available for Windows, Linux, Mac and Solaris, click here to download.

This is the latest update for the Xpress 8.8 release branch. Please note that the Windows, Linux or Solaris archives must be extracted over a prior installation of FICO Xpress 8.8. This patch requires an Xpress 8.8 license.

Release Notes:

Xpress Optimizer 35.01.09

Fixed an issue with the creation of semi-continuous variables during presolve that could result in some variables having a small non-zero lower bound.
Fixed an issue with converting quadratic matrices into second-order cones in presolve, which could result in memory corruption.
Fixed a problem in the primal simplex method that could cause cycling on numerically difficult instances.
If set, MPSOBJNAME is now used to control the name of the neutral row representing the objective in an MPS file.
Fixed an issue with fixed but not explicitly binary indicator variables when there are no other global entities.
Fixed issues with reading and writing LP files with set elements with reference value zero.
Fixed a few issues in the Python interface
- usage of the xpress.Dot operator;
- Restored Knitro control setting;
- A race condition in xpress.problem.globalsol();
- Usage of generators in the addition of variables, constraints, or SOS;
- Usage writeslxsol for nonlinear problems.
Fixed an issue in branching estimate calculation with superbasic variables that could lead to feasible solutions getting cut off.
Fixed an issue with the greatest common divisor not taking into account semicontinuous variables.
Fixed an issue in presolve that could lead to rows and bounds getting incorrectly relaxed.