# Maliheh Aramon

Gurobi Staff
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## Activity overview

Latest activity by Maliheh Aramon
• Maliheh Aramon commented,

Hi Jia,  The following should get you started. Gurobi has an interface for modelling piecewise-linear objective functions. The linked section explains in detail how to define piecewise-linear fun...

• Maliheh Aramon commented,

Hi WI,  Since $$\texttt{Var_min}$$ and $$\texttt{Var_max}$$ are variables in your model, normalizing the decision variables as $$(\texttt{Var[i]} - \texttt{Var_min})/(\texttt{Var_max} - \texttt{Var... • Maliheh Aramon commented, Hi Maedeh, The simplest approach would be to manipulate the variable string names to retrieve the indices \(i$$ and $$j$$. You can modify the assignment variable names, $$\texttt{assignment[i,j]}\... • Maliheh Aramon commented, Hi Natalie, How did you identify that the xx values in the condition xj>=xixj>=xi are for the coordinates and not the xkixik or xkjxjk boolean variables? I ask because I had assumed that the jj f... • Maliheh Aramon commented, Hi Natalie, Based on the paper (page 4), it seems to me that each fruit \(i$$ has known $$(x_i, y_i)$$ coordinate values . You just need to ensure that the second constraint is implemented for the...

• Maliheh Aramon commented,

Hi Jacob,  The callback routines in Gurobi take two arguments: $$\texttt{where}$$ and $$\texttt{what}$$. The former argument tells the Gurobi Optimizer from where the callback should be called and ...

• Maliheh Aramon commented,

Hi Fikri, Yes, you are right. Almost all modern computers use double precision (64 bits) nowadays. The parameter Quad is specific to the simplex algorithm and the warning message "switch to quad pr...

• Maliheh Aramon commented,

Hi Fikri,  How do I try different seeds? There is a parameter named Seed in Gurobi that you can use like any other parameter. The default value is 0.  You are very welcome! Best regards, Maliheh

• Maliheh Aramon commented,

Hi Fikri,  Thank you for the detailed message and sharing all the experiments.  I have completed the experiments that you suggested, except the one which requires me to increase the number of dens...

• Maliheh Aramon commented,

Hi Benay,    To debug your code and narrow down the infeasibility in your model, you can use the Gurobi Model.computeIIS() method to find an irreducible inconsistent subsystem (IIS) and write it in...