Comments (5)
jajhall
commented on July 20, 2024
Strange. I'll investigate
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amigalemming
commented on July 20, 2024
Sounds similar to this one: #1517
Btw. I am using github/HiGHS/HEAD.
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jajhall
commented on July 20, 2024
Sounds similar to this one: #1517
No, #1517 relates to a MIP
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jajhall
commented on July 20, 2024
I've reproduced the behaviour that you observe, both with your model, and without the OBJSENSE MAX but with negated objective coefficients. It's clearly a bug in presolve where an illegal dual reduction is performed that results in false detection of infeasibility. Since it's such a small problem, it should be easy to track down. However, I'm travelling this week and it's hard to do work like this on a small laptop screen.
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jajhall
commented on July 20, 2024
Fixed by #1544
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Related Issues (20)
- Add irreducible inconsistent system (IIS) identification for LP
- Build fails on macOS: `f951: Error: '-fno-fat-lto-objects' are supported only with linker plugin` HOT 3
- Get Column Cost HOT 1
- Spurious statement of Integer when writing model HOT 1
- primal_solution_status is reported as kSolutionStatusFeasible for infeasible model when solver=ipm and presolve=off
- How to Set a Partial MIP Solution using setSolution()? HOT 11
- Logging header not printed if `h.writeModel` or `h.writeSolution` called before a method using the HighsIO
- `Highs::writeModel("")` uses `HighsIO`, but `Highs::writeSolution("")` uses `fprintf` for stdout HOT 1
- HiGHS 1.7.1 HighsCallbackDataOut data type can no longer be accessed directly for mip_solution item. HOT 1
- Time limit solving Jeroslow MIP seems not to be triggered HOT 2
- Stop MIP solve on `simplex_iteration_limit` (or other LP iteration limit) - Access iteration count via callback? HOT 2
- CMake configuration fails with versions >3.23.0 and <3.24.0
- Longer runtimes for ILP models created with `addVariable` versus `addCol` HOT 4
- PInvokeStackImbalance exception when targetting .NET Framework (Windows)
- highspy API improvements and benchmark HOT 1
- Stream HiGHs solver output in pyomo HOT 1
- Add user cuts
- Running in Parallel gives unexpected result. HOT 9
- LeakSanitizer locates memory leaks in highs HOT 2
- linker error due to .res files from v1.7.0
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