Constraint has no bool value (are you trying "lb <= expr <= ub"?)

回答済み

Yunus Emre Çakır

2024年01月26日 10:32

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I have the following decision variables
r_max = bilevel.addVar(lb= 0 , ub= gp.GRB.INFINITY, vtype=gp.GRB.CONTINUOUS, name="r_max")

 

x_ij_km = {}
for i, j in edges:
    for k in K:
        for m in M:
            x_ij_km[i, j, k, m] = bilevel.addVar(lb=0, ub=gp.GRB.INFINITY, vtype=gp.GRB.CONTINUOUS, name=f"x_{i}_{j}_{k}_{m}")

When I run the following constraint (
bilevel.addConstrs(sum(x_ij_km[i, j, k, m] * l_ij_mk_c[i, j, k, m, c] * l_ij_mk_c * phi_k[k] for k in K for m in M for i,j in edges) <= r_max for c in C) 

Note: l_ij_mk_c, l_ij_mk_c, phi_k are all parameters 
I receive the following error:

    bilevel.addConstrs(sum(x_ij_km[i, j, k, m] * l_ij_mk_c[i, j, k, m, c] * sigma_ij_km[i, j, k, m] * phi_k[k] for k in K for m in M for i,j in edges) <= r_max for c in C)

  File src/gurobipy/tempconstr.pxi:57 in gurobipy.TempConstr.__bool__

GurobiError: Constraint has no bool value (are you trying "lb <= expr <= ub"?)

What might be the reason? How can I fix that?

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:31

  This post is more than two 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.
• 

  Marika Karbstein

  • Gurobi Staff

  2024年01月26日 10:44

  Please check the article Constraint has no bool value (are you trying "lb <= expr <= ub"?)  for a solution.

  If you do not find any, then please create a minimum reproducible example (Tutorial: Preparing a Minimal Reproducible Example).

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