Alison Cozad

This can be tricky because shadow prices are not well-defined in mixed-integer programs.  For this reason, Gurobi does not provide dual values for a model with integer variables.  Nevertheless, if ...

To help expand on these two feasibility tolerances: FeasibilityTol (Primal feasibility tolerance) Default value: 1.00E-06 Description: All constraints must be satisfied to a tolerance of Feasibili...

This is certainly a tricky topic. Luckily, Yash Puranik, a Principal Data Scientist at Aimpoint Digital, has put some thought into this topic and shared his and Aimpoint's principles for deploying,...

To illustrate these three methods, we will dig into the diet problem below. This is based on the diet.py example in Gurobi's example library. The diet problem -- MIP version Here is the full MIP ve...

Hi Manuel, I have created a help request from this.  We can discuss licensing options for you in that request.

One last item, I suspect you want the last term in the objective to be \(\displaystyle \sum_{s=0}^{|S|} p_s \cdot \displaystyle \sum_{i\in I} f^\mathrm{bio}y^\mathrm{bio}_i \) rather than  \(\displ...

I suspect this is a parenthesis issue.  Right now, you have the following objective: \( \displaystyle \sum_{s=0}^{|S|} p_s \cdot \displaystyle \sum_{k\in K}\displaystyle \sum_{j\in J}\displaystyle ...

As far as I can tell, this should work.  It's worth noting that the SolFiles parameter was introduced in Gurobi version 9.0.  What version of Gurobi are you using?

Your objective is currently defined as 9 separate elements (\(\texttt{len(I) * len(J)}\)): \(\alpha \cdot D_{ij} \cdot X_{ij} \quad \forall i \in I, j \in J\) Gurobi is expecting a single expressio...

It looks like the Variable object, \(\texttt{TT}\), is being used inside of the range() function.  This function only accepts numerical values.  This is what is causing your error. It also looks li...