liu heng

My understanding is that, MIPSOL_OBJ (Objective value for new solution) is the currently found objective, and MIPSOL_OBJBST is the best obj before this currently found incumbent.  Thus MILSOL_OBJ p...

I want to record the primal bound along with the time spent, in order to plot the figure.

How can I collect a rich set of feasible solutions (both high-quality and bad ones). It seems like PoolSearchMode=2 does not collect bad solutions while PoolSearchMode=1 does not collect the good o...

Suppose m is the original model and p = m.presolve() If I do some modifications on p (e.g. optimize or modify variable bounds), will the original model be modified?

Assume the original model m has 100 variables, and I fix 30 of the 100 variables by setting v.UB=1 , v.LB=1. I want to get the corresponding model with 70 variables. However, if I call p=m.presolve...

Suppose "sol" is a list that consists of the value of each variable.(sol is given by user) How to compute the objective and feasiblity of sol

Suppose I manually give a solution by setting v.Start = xxx. Then I call m.optimize() and the log only shows that "Loaded user MIP start with objective xxx". Does it means the solution is feasible?

How do Precrush and  AggFill/Aggregate affect variables?(introduce new vars or remove vars)

In m.optimize(),  a presolved model p is generated and solved, then the solution of p is automatically mapped back to m. Can I stay at the state where p is generated but not solved? I want to try s...

Suppose model_1 is read from file. model_2 = model_1.copy() if i modify model_2（fix variables or add constraints）, will model_1 still keep the original form?