Manuel Fernandez de Dios
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Activity overview
Latest activity by Manuel Fernandez de Dios-
Manuel Fernandez de Dios commented,
Hi, The problem is that in this type of model the presolve slows down the solution of the problem. I ran the AMPL version with presolve off, but the R API version with presolve on. That's why I got...
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Manuel Fernandez de Dios commented,
Thanks Matthias, R API interacts with Gurobi with files or by memory? Cheers Manuel
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Manuel Fernandez de Dios commented,
Sorry Matthias, It's the same problem, log files extracts are from different iterations. Here is the first iteration in both AMPL Presolve eliminates 0 constraints and 68 variables.Adjusted probl...
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Manuel Fernandez de Dios commented,
Hi Log file extract (1 iteration) R API Gurobi 9.5.1 (linux64, R) logging started Xov 14 Abr 2022 17:49:02Set parameter UsernameSet parameter LogFile to value "TSP.log"Academic license - for non-co...
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Manuel Fernandez de Dios commented,
Thanks a lot, Matthias Cheers, Manuel
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Manuel Fernandez de Dios commented,
Hi, something like that result <- gurobi(model, params) time=result$runtimewhile(#----subtour found--------){ # re = new subtour elimination constraint model$A=rbind(model$A,re) model$sens...
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Manuel Fernandez de Dios created a post,
R API slower than AMPL?
AnsweredI am making a comparison between solving a problem with Gurobi using AMPL and using directly the R API. The result I find is surprising, it is much faster to solve with AMPL (computing only solver ...