Tag Info

Application of complex numbers in Linear Programming?

In 1965 I published a paper where I used linear optimization of a complex variable to analyze the complex dielectric behavior of an organic liquid. Wish I could give more details, but it's been a long ...

What would be a representative/appropriate name for operations research?

I normally answer the "what's your field?" question with "operations research" and then follow up with a quick definition: "using mathematics and statistics to make decisions&...
• 28.8k

How to put this restriction using Gurobi in python

Firstly, your constraint should rather look this this: $$\sum_{j=0}^{i}X_j \leq H_i \quad \forall i \in I$$ $$\sum_{j=0}^{i}X_j \geq L_i \quad \forall i \in I$$ In your code this should translate to: <...
• 564
Accepted

On the non-sufficiency of total unimodularity of the constraint matrix in the definition of an integer polytope

The answer is yes, and the proof is trivial. Recall that a TUM matrix has all coefficients in $\lbrace -1, 0, 1\rbrace.$ Start with any $P := \{ x\in \mathbb {R}^{n} \mid A x \leq b\}$ that is integer....
• 28.8k

How to use condition in cplex?

In OPL CPLEX you can use if then logical constraints. For instance ...
• 3,337

What would be a representative/appropriate name for operations research?

You could use a less technical term, such as the old "efficiency expert". Even if they don't know what it actually means, most people will at least think that they know what it means. You're ...

How to input this LP model of a buffer allocation problem in Gurobi?

You correctly identified that this a linear program. You could either specify this problem in the .lp file format see the Gurobi documenation and consult the syntax rules if you have questions or you ...
• 3,349
Accepted

• 21.7k
Accepted

Solving Graph Partitioning Problems with Gurobi and Pyomo

I would like to ensure that the optimal solutions that are solved within this small amount of times are still solved with optimal solutions while the MIPGap only applies to those slow problems. I ...
• 396