Community Digest

Top new questions this week:

What is Tuy's cut (concavity cuts) and why it is significant comparing to the other cuts?

I am a network engineer working with optimization models. In some transportation and logistics models, especially when there are economies of scale, the cost function becomes concave. I am not sure ...

nonlinear-programming nonconvex-programming global-optimization cutting-planes global-optimality  
user avatar asked by Tuong Nguyen Minh Score of 2

Greatest hits from previous weeks:

How does a warm start work in LP/MIP?

Can someone explain how warm starts/ MIP starts work? How do solvers like CPLEX/GUROBI use warm start with the Simplex algorithm? I am interested in understanding how the entire warm start pipeline ...

mixed-integer-programming linear-programming cplex gurobi warm-start  
user avatar asked by Palaniappan Chellappan Score of 22
user avatar answered by Philipp Christophel Score of 17

TSP with revenue maximization

How to approach a traveling salesman problem with an aim to maximize revenue at each town visited in a certain number of days (total number of towns is greater than what can be visited in the given ...

optimization linear-programming traveling-salesman  
user avatar asked by user23369 Score of 18
user avatar answered by RobPratt Score of 18

Solving a knapsack problem with a lot of items

I am wondering what are the fastest ways(faster than classical dynamic programming) to solve the knapsack problem (to optimality) with $n$ items when $n$ is nearly equal to $10000$ ? Apart from ...

dynamic-programming knapsack  
user avatar asked by Joffrey L. Score of 20
user avatar answered by Ruslan Sadykov Score of 19

NLP solvers in pyomo other than ipopt?

I am solving a highly constrained (large number of constraints and large number of variables, but small degree of freedom) NLP problem, and for start, I was using Matlab's ...

nonlinear-programming pyomo  
user avatar asked by Stanny_boy Score of 19
user avatar answered by chupa_kabra Score of 7

How is Big M calculated?

Because of excessive pollution on the Momiss River, the state of Momiss is going to build pollution control stations. Three sites (1, 2, and 3) are under consideration. Momiss is interested in ...

optimization mixed-integer-programming integer-programming big-m  
user avatar asked by Slim Shady Score of 5
user avatar answered by RobPratt Score of 7

Supply Chain Public Data Repository

I was wondering if there is any repository of datasets for supply chain problems. For example, the UC Irvine Machine Learning Repository contains datasets for ML, and MIPLIB is used as a benchmark for ...

online-resources data supply-chain  
user avatar asked by Afshin Oroojlooy Score of 14
user avatar answered by Rob Score of 11

Make a living as a math programming freelancer?

I would like to know how the (job) market for operations research works. My dream would be to work as a freelancer in the area of math programming. I have a PHD and several years of proven experience ...

job-market  
user avatar asked by hplan Score of 32
user avatar answered by Sean Kelley Score of 31
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