Alexander Haberman
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Latest activity by Alexander Haberman
Alexander Haberman created a post,
Concurrent Optimizer and Infeasibility
AnsweredIs it possible to use concurrent but have gurobi continue with another algorithm if the first algorithm to terminate yields infeasibility or unboundedness

Alexander Haberman created a post,
Crossover
AnsweredWhat does crossover do? When is it ok to disable it if I'm using barrier? I have an LP for which barrier gets a solution in minutes but crossover takes days.

Alexander Haberman commented,
I am having trouble writing constraints of the form: ln(x+y)=z where x,y and z are all variables. Why is this? Is there a solution or should I just add an auxiliary variable equal to x+y? The error...

Alexander Haberman commented,
Thank You!

Alexander Haberman created a post,
Mutual Information as PWL Constraint
AnsweredI am trying to write a mutual information constraint in gurobi which I would guess is something of general interest. Broadly, I am curious on the best way to combine PWL constraints. The constraint...

Alexander Haberman created a post,
Summing Variables by Indices in Python
AnsweredLet's say I have a set of variables x indexed from 1 to 100. How can I constrain the sum of all x indexed i or higher?

Alexander Haberman commented,
Thank you very much Maliheh! Your first suggestion worked great except that when I turned the hard LP into an MIP I got that the runtime of the MIP was faster than the original LP even without the ...

Alexander Haberman created a post,
Verification without DStart
OngoingI have two LPs with the same variables but different constraints. I want to check my conjecture that the solutions to the two problems coincide. Unfortunately, one of the problems has an extremely ...

Alexander Haberman commented,
Thanks Richard, that is very helpful!

Alexander Haberman created a post,
SOS Constraint with sum
AnsweredIs there a way to create a SOS constraint where one of the variables is a sum of variables? I have n+1 nonnegative variables denoted x_1,...x_n, y and would like to add a constraint that either y=...