Julian Hall
In the context of `https://github.com/ERGO-Code/HiGHS/issues/897` I saw #548 and had a look at `https://github.com/coin-or/pulp/blob/master/pulp/apis/highs_api.py` This is very out-of-date. If nothing else, HiGHS can now solve MIPs - rather well! I...
Generalise this by allowing a HiGHS solution file to be read when running the HiGHS executable, so advanced basis start for simplex can also be handled.
A user has asked for a callback whenever an integer feasible solution is identified by the MIP solver. This doesn't strike me as being a difficult thing to introduce. What...
Probably prohibitively expensive for "bound" ranging on basic variables.
Placeholder issue for the introduction of MIP callbacks, as discussed with @lgottwald Requested within https://github.com/coin-or/python-mip/issues/255
In https://github.com/rust-or/highs/issues/3# it's suggested that "there may be a double-free when a problem is created with Highs_create, then incoherent values are passed with Highs_passLp, which returns an error status, and...
Here's a message from a user: I downloaded the HiGHS software from github. I am compiling the software using Visual Studio 2017 and Intel Fortran 2020 on Windows 10, 64-bit....
IPX seems to have an option to log to a file as well as, or instead of?, to the screen. But the file is opened and ultimately closed in LpSolver::Solve....
By default, postsolve uses a local tolerance "double tol = 0.0000001;", set in Presolve.h Running master on 25fv47 with the following option settings solver=ipm ipm_optimality_tolerance=1e-3 start_crossover_tolerance=1e-3 primal_feasibility_tolerance=1e-3 dual_feasibility_tolerance=1e-3 causes highs:...
Checking code for the HMatrix class is out-of-date