Alexander Haberman

Gurobi-versary
Curious
First Comment
  • Total activity 24
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Activity overview

Latest activity by Alexander Haberman

  • Alexander Haberman created a post,

    Concurrent Optimizer and Infeasibility

    Answered
    1. Community
    2. Algorithms

    Is it possible to use concurrent but have gurobi continue with another algorithm if the first algorithm to terminate yields infeasibility or unboundedness

    • Alexander Haberman
    • 1 follower
    • 0 comments
    • 0 votes

  • Alexander Haberman created a post,

    Crossover

    Answered
    1. Community
    2. Algorithms

    What 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
    • 2 followers
    • 1 comment
    • 0 votes

  • Alexander Haberman commented,

    1. Community
    2. Modeling
    3. Mutual Information as PWL Constraint

    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...

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    • Alexander Haberman
    • 1 vote

  • Alexander Haberman commented,

    1. Community
    2. Modeling
    3. Mutual Information as PWL Constraint

    Thank You!

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    • Alexander Haberman
    • 1 vote

  • Alexander Haberman created a post,

    Mutual Information as PWL Constraint

    Answered
    1. Community
    2. Modeling

    I 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
    • 3 followers
    • 4 comments
    • 1 vote

  • Alexander Haberman created a post,

    Summing Variables by Indices in Python

    Answered
    1. Community
    2. Programming

    Let'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
    • 2 followers
    • 1 comment
    • 0 votes

  • Alexander Haberman commented,

    1. Community
    2. Modeling
    3. Verification without DStart

    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 ...

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    • Alexander Haberman
    • 0 votes

  • Alexander Haberman created a post,

    Verification without DStart

    Ongoing
    1. Community
    2. Modeling

    I 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
    • Edited
    • 2 followers
    • 2 comments
    • 1 vote

  • Alexander Haberman commented,

    1. Community
    2. Modeling
    3. SOS Constraint with sum

    Thanks Richard, that is very helpful!

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    • Alexander Haberman
    • 0 votes

  • Alexander Haberman created a post,

    SOS Constraint with sum

    Answered
    1. Community
    2. Modeling

    Is there a way to create a SOS constraint where one of the variables is a sum of variables? I have n+1 non-negative variables denoted x_1,...x_n, y and would like to add a constraint that either y=...

    • Alexander Haberman
    • 3 followers
    • 3 comments
    • 0 votes