Nonlinear model

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Yomaira Cerón

2022年04月24日 21:39

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Can someone help me please, I am implementing the following nonlinear programming model, only F_{ij}^{rt} and C_{ij}^{rt} are variables, the other parameters are known.

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  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:39

  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.
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  Jaromił Najman

  • Gurobi Staff

  2022年04月25日 08:45

  You can use the quicksum function to model your sums. An example for inequality (2) would be

  for k in K:
    model.addConstr(gp.quicksum(i[r,t,i,j,k] * ccap[t] * F[r,t,i,j] * C[r,t,i,j] 
                                for r in range(1,rmax)
                                for t in T
                                for i in range(1,smax)
                                for j in range(i+1,smax)) >= n[k])

  Note that I am just guessing your data structures in the above code example. All other terms can be constructed in a similar way. You can find an introduction into gurobipy modelling in our Python webinar and our Python examples.

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