Abs function in Cpp

Answered

Nooshin Heidari

August 13, 2024 14:22

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I need to define the absolute value of some varibales in cpp and I have used the provided syntax like :

            for (int v = 1; v <= nVehicles; v++) {
                for (int i = 1; i <= NA[v - 1].size(); i++) {
                    for (int m = 1; m <= Mu[(NA[v - 1][i - 1]) - 1]; m++) {
                        GRBVar ABS;
                        model->addConstr(ABS == abs_(gap_prev[v][NA[v - 1][i - 1]][m]));}}}

but still I get the error as :"identifier abs_" is undefined! Would you please help me to know the problem?

 

Related to

• General Constraints

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:21

  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.
• 

  Riley Clement

  • Gurobi Staff

  August 13, 2024 23:53

  Hi Nooshin,

  abs_ is a function from our Python API and does not exist in the C++ API.

  Please use GRBModel::addGenConstrAbs()

  - Riley

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