Saturday, October 21, 2023

Scheduling Team Meetings

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This is a simple problem from [1]: I'm rusty on constraint optimization and am looking for help in this particular use case. There are i...
2 comments:
Friday, October 20, 2023

GAMS: SMAX and sparsity

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This is a discussion about the SMAX function in GAMS and how it behaves for sparse data. The data structure we were facing was something lik...
Thursday, October 19, 2023

Plotting NUTS-2 maps from GAMS

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 NUTS-2 regions are statistical subnational regions (often provinces), mainly for the EU and UK [1].  NUTS hierarchy (from [1]) In [2] we ca...
Thursday, October 5, 2023

Linear Programming Nonsense?

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1. Inventory balance constraints I came accross this text [1]: Inventory Balance Constraint
Wednesday, September 27, 2023

Math and ChatGPT

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Performing symbolic math steps is often related to pattern recognition. In theory, ChatGPT could be doing a good job here. I wanted to find ...
2 comments:
Wednesday, September 20, 2023

Julia vs Python

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I gave a talk to economists (i.e., not professional programmers) about a Julia project we were working on. Julia is famous for its speed. I...
7 comments:
Monday, September 4, 2023

Critiquing a GAMS Model

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It is always interesting to read GAMS models written by someone else. There are probably three things one can observe: A nice formulation or...
Tuesday, August 29, 2023

Three-level Matrix Balancing

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Matrix balancing: introduction Matrix Balancing Models are often used in economic modeling exercises: they create consistent data sets fr...
Friday, August 4, 2023

Some TSP MTZ experiments

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In [1], a question was posed about a TSP model using the MTZ (Miller-Tucker-Zemlin) subtour elimination constraints. The results with Julia/...
6 comments:
Wednesday, July 12, 2023

Coloring edges of a grid

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This is a little coloring problem from [1]: Given an m * n grid, each edge must be colored. However, there are 2 constraints: Entire grid m...
3 comments: