How do I set the initial value of an MVar?

回答済み

Matthew Greenberg

2022年06月13日 18:31

• 
• 
• 

If I'm reading the docs correctly, MVars don't have a Start attribute. Is there an ergonomic way to set their initial values? Do I have to loop over the constituent Vars? Working with the Python version.

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:34

  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 try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Jaromił Najman

  • Gurobi Staff

  2022年06月14日 07:02

  One way of setting the Start attribute for MVar objects is

  import gurobipy as gp
  import numpy as np
  
  m = gp.Model()
  
  x = m.addMVar(2)
  A = np.random.rand(2,2)
  
  m.addConstr(A @ x <= 1)
  
  start = [0,1]
  x.Start = start
  m.update()
  print(x.Start)

  You could alternatively use the tolist() method and assign each Start value one by one. You could also use a solution file, see How do I use MIP starts?

  Best regards, 
  Jaromił

  1

投稿コメントは受け付けていません。