how to write code in GURBI MATLAB API for the constraint which is having expression in the right hand side .

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AMIT KUMAR

• March 06, 2024 06:24

how to model the constraints in GUROBI MATLAB API, when there is an expression in the RHS. For example how to model the given example:

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  Ahmed Azab

  Gurobi Staff

  • March 06, 2024 10:36

  Hi AMIT,

  Please refer to the Gurobi reference manual for a better understanding of using Gurobi with MATLAB.

  Here, you will find MATLAB API Overview.
  Here, you will find more MATLAB Examples.

  - Ahmed

   

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  AMIT KUMAR

  • March 06, 2024 11:33

  

  

  Hello Ahmed Azab,

  Thanks a lot,

  I have gone through the Gurobi reference manual, from the reference manual I am not clear that how to model the constraint if it is having expression in RHS. As per the reference manual, GUROBI-MATLAB API requires constant term in the RHS. The below quoted line is written in the Gurobi reference manual.

  ''Note that the matrix oriented Gurobi APIs (C, MATLAB, and R) require the right-hand side of a linear constraint to be a constant, while the object-oriented APIs (C++, Java, .NET, and Python) allow arbitrary linear expressions on both sides of the comparator''.

  I am a beginner of GUROBI. kindly help me to write the below given equation in GUROBI MATLAB API.

  

  In the above given equation, i and j are different points, t denotes tine interval. QLji,t is the power flow from point j to i and QLij,t is the power flow from i to j. Qi,t is the power flow in any one direction. Qi,t is the total power at point i at time time t . 

  Looking forward for the solution

  thanks

   

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  Ahmed Azab

  Gurobi Staff

  • March 07, 2024 00:38
  • Edited

  You can rearrange the equality so that all variables are on the LHS, and the RHS value is zero:

  X = Y - Z 

  to be 

  X - Y + Z = 0

  I am not familiar enough with the Matlab API to provide a specific implementation for your constraint.  But let's see if any of my colleagues, or someone from the community, can respond.
  
  Thanks
  - Ahmed

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