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Questions - operations-research

What kind of Linear Programming is this?

I started study Operations Research (OR) recently and I faced a problem which I struggled to modeling it to traditional OR problems. I'm not sure if such problem is a linear one nor if it can be sol...
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JRG

mathematical-optimization

operations-research

Votes: 0

Answers: 1

Latest Answer

It is a linear programming problem, but it looks like there is something wrong about the question. You can't really buy, let's say 'at least 27% corn', at the moment. Percentages of each product are g...
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Zeynep

How to bundle pairs of trips?

I have a database of optional real-time trip demands. Each with a load that can to be delivered from a departure point to a destination: ID,EndDateEnd,EndDateStart,StartDateEnd,StartDateStart,DepX,Dep...
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dank

mathematical-optimization

or-tools

vehicle-routing

operations-research

Votes: 0

Answers: 1

Latest Answer

There is a pdptw example in the routing library: Simple Pickup and Delivery problem in C++
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Laurent Perron

Transportation cost optimisation using OMPR for a large data set

I am solving a transport optimization problem given a set of constraints. The following are the three key data sets that I have #demand file demand - has demand(DEMAND) across 4821(DPP) sale points(D)...
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Srikanth Viswanathan

optimization

routes

bigdata

operations-research

ompr

Votes: 0

Answers: 2

Latest Answer

Both OMPR and GLPK are slow for large models. You are duplicating sum_over(x[i,j], j = 1:ncol(LCMat)). That leads to more nonzero elements than needed. I usually try to prevent that (even at the expe...
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Erwin Kalvelagen

How to use PROMETHEE multicriteria method in R

I used TOPSIS multicriteria method to select the best number of clusters out of the 34 options. As weights I used 0.5 for each criterion. The coverage criterion is to minimize and the production crite...
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Antonio

r

optimization

operations-research

Votes: 0

Answers: 1

Latest Answer

This closely follows the vignette of the PROMETHEE package, but is hopefully helpful to clarify how to adapt it for the example shown in the question. setup For each argument to the PROMETHEE function...
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pholzm

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