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Questions - ompr

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 include matrix multiplication in constraint?

I am trying to make run this model. I am trying to maximize:x[4] w.r.t Mv = c(0,0,0,0) lb < v < ub But I have 2 problems, first matrix multiplication. library(ompr) lb <-...
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Omar113

r

ompr

Votes: 0

Answers: 1

Latest Answer

Works like this, but the solution is (0, 0, 0, 0): library(ompr) library(ompr.roi) library(ROI.plugin.glpk) library(magrittr) lb <- c(-200, 0, -200, -200) ub <- c(1000, 1000, 1000, 1000) M <...
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St&#233;phane Laurent

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