Release Notes for 8.14.6
Xpress Optimizer 40.01.06
Xpress Nonlinear 40.01.06
Xpress Solver Interfaces 40.01.06 (Python, R, Matlab, .NET, Java)
Xpress Optimizer 40.01.06
- Fixed and issue with MIP solution refinement enabled by bit 10 of the REFINEOPS controls. This could result in infeasible solutions being returned.
- Fixed an issue when timing out during MIP presolving.
- Fixed an issue when setting heurthreads!=0 that prevented a local search heuristic from terminating when a problem is solved to completion.
- Fixed an issue for binary quadratic equality constraints.
- Fixed an issue about protected objective transfer rows.
- Fixed problems when handling more than one user-provided MIP solution which could cause a crash.
- Fixed an issue where piecewise linear/general constraints were not reset correctly after reading in/loading a new problem, which could lead to crashes when loading a problem without them after previously having loaded a problem with either of them.
- Fixed an issue where using a checktime callback could leave the problem in an invalid state.
- Fixed an issue in the integer presolver related to protected rows
- Fixed a minor issue in the mod2 presolver technique potentially leading to wrong optimal solutions.
Xpress Nonlinear 40.01.06
- Fixed an issue with copying problems in a presolved state.
- Fixed an issue where problems with some non-convex binary quadratic and some general non-convex quadratic constraints were incorrectly declared convex.
- Fixed an issue where linearizations were solved as a MIP even though piecewise linear and general constraints were not transformed to MIP structs since the problem remained nonlinear.
Xpress Solver Interfaces 40.01.06 (Python, R, Matlab, .NET, Java)
- Fixed a crash in the Python interface when problem.setControl was passed an invalid control name.
- In Python, fixed a library conflict which could cause an error on Windows: OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.
Updated 3 years ago
Version 3.0