Partition Heuristic

Answered

Gerwin Gamrath

• April 24, 2019 14:12

I want to test the new "Partition Heuristic".

When setting the parameter Partition (http://www.gurobi.com/documentation/8.1/refman/partition.html#attr:Partition) the following was not clear to me:

Short question: What is the default value for the Partition parameter?

Longer question: Let's say i have 7 different days. I also have a class of variables Y(i) for each day... Monday has variables Y(1), Tuesday has variables Y(2) and so on...
Then all vars in Y(1) will get Partition=1, all vars in Y(2) will get Partition 2, and so on...
But I also have some global / day-independent variables. When I don't set a Partition parameter for these variables, will they be excluded (Partition = -1) or included (Partition = 0) for every sub-MIP?

What I want is more the second: For example: Only focus on monday (and all global) variables and "ignore" the other days for this moment. 
Would be nice (for me) if this is the default and I don't have to care for the other variables and yet-to-come variables...

 

Thanks,
Gerwin

0

• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:59

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
• 

  Daniel Espinoza

  • April 25, 2019 13:06

  Hi Gerwin,

   

  The default value for the partition attribute is -1, so any variable for which its partition attribute is not set will be excluded in all sub-problems. Thanks for pointing out the gap in the docs.

   

  Best,

  Daniel

  0
• 

  Gerwin Gamrath

  • April 25, 2019 13:14

  

  

  

  Hello Daniel,

  thanks for the clear answer.
  
  Best,
  Gerwin

  0

Post is closed for comments.