I'm working on modeling a VRP-type problem where drivers not showing up is a problem. I'm wondering if people have done work on this and having trouble finding much (or anything at …

This must seem like a really elementary question, so please bear with me. Suppose I have a nonlinear system of equations: f(x) = 0 where x = [ y z u ]'. y = vector of output var …

Hi everyone. Another DW question... First of all, you can see the structure of my problem here: http://www.kreutz.us/images/structure.png (Note: I know Benders decomp would probab …

Hi everyone I'm solving a problem using DW which has many subproblems (as seen in the drawing here: http://en.wikipedia.org/wiki/Dantzig%E2%80%93Wolfe_decomposition ). In a given …

How industrial engineering differs from operational research ? I came across following various which more or less relate to a common idea of making system efficient a) Industrial …

Hi Guys, I am working on a LP relaxation of a large scale industrial problem ( over half a million variables and several tenths of thousands constraints ), using coin-or clp. Do y …

I'm working on a problem that is closely related to one-dimensional bin packing. All of the research that I've found on bin-packing focuses on heuristics, approximation algorithms, …

What are questions you would ask if you are conducting an interview for hiring a Operations Research Analyst?

What is the best approach to start formulating a model given the project requirements? In other words how do you structure your "FORMULATION" process?

Has anyone tried to develop a method to predict run-time of a mathematical model given a solver like CPLEX?

Hi folks, I am currently developing a data analysis prototype for a set of ~40-dimensional data points and therefore try to map all of them into a metric space. However, my featur …

I'm looking for answers that is using OR in your daily lives that is outside of your day job. Have you used OR for fun? Did you use it to solve for something around the house, co …

In a Twitter discussion about symbolic regression (more specific about the genetic programming system Eureqa), siah suggested using LP instead of genetic programming, and stated th …

Hey, When looking through Coin-Or, I found they were referring to a constraint type called "free constraint". For instance here. Does any one know what a free constraint is? Tha …

What are some guidelines for deciding whether a MIP or CP approach is more appropriate for modeling an optimization problem? Or in what cases should CP be used instead of MIP?