norm function should take expressions

Answered

Brannon King

• September 26, 2023 15:55

I want to be able to code like this:

m.setObjective(gp.norm(x-y, 2), minimize);

where x is a variable (or list of variables or MVar) and y is a numpy array.

Related to

• Modeling

0

• 

  Riley Clement

  Gurobi Staff

  • September 27, 2023 12:31

  Hi Brannon,

  It is possible to model what you are after, just with extra steps, eg

  x = m.addMVar((5))
  z = m.addMVar((5))
  m.addConstr(z == x - np.array([1,4,3,0,-2]))
  
  w = m.addVar()
  m.addConstr(w == gp.norm(z,2))
  m.setObjective(w)

   I can pass your request onto our developers.  I suspect it is a case of syntactic sugar, and ultimately these auxiliary variables (such as z and w) have to be added either explicitly, like above, or implicitly under the hood.

  - Riley

   

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