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Questions tagged [neos-server]

The NEOS (Network-Enabled Optimization System) Server is a free Internet-based service for solving optimization problems.

The NEOS (Network-Enabled Optimization System) Server is a free Internet-based service for solving optimization problems.

27 questions
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Neos CMS error Call to undefined function GuzzleHttp\Psr7\str()

i'm very new in Neos CMS. I install Neos CMS according to this tutorial https://neutroncloud.in/docs/how-to-install-neos-cms-on-ubuntu/. I've been struggling for 3 days for install it. When i finally set it up, i've set everything up. And after…
marekus
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Using NEOS as a Pyomo solver

I have recently started in doing some OR, and have been trying to use Pyomo and NEOS to do some optimation problems. I have been following along with one of the UT Austin Pyomo lectures, and when my GLPT was being difficult to be installed, I moved…
Stephen Smith
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How to access the content of the log file after using Pyomo to call a solver in NEOS server?

I am using Pyomo to run BONMIN solver from the NEOS server. However, it returns a simple log file without any useful information such as the number of iterations. Can you let me know what I should do to retrieve the full log file? The code in Pyomo…
clarkkent
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email address not recognised in XML-RPC interface to Neos Server

I am using the XML-RPC submission API to the Neos Server (optimization, AMPL, MILP, Cplex) and am receiving an error message to say that "CPLEX will not run unless you provide a valid email address." Am I misinterpreting what I should do with the…
dcl04
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Print only nonzero results using AMPL + Neos server

I'm doing a optimization model of a relatively big model. I will use 15 timesteps in this model, but now when I'm testing it I am only using 4. However, even with 11 time steps less than desired the model still prints 22 000 rows of variables, where…
Cenderze
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AMPL:How to print variable output using NEOS Server, when you can't include data and model command in the command file?

I'm doing some optimization using a model whose number of constraints and variables exceeds the cap for the student version of, say, AMPL, so I've found a webpage [http://www.neos-server.org/neos/solvers/milp:Gurobi/AMPL.html] which can solve my…
Cenderze
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Error parsing NEOS solution file in Pyomo

I wrote a very simple model in Pyomo environment and added the following two commands at the end. solver_manager = SolverManagerFactory('neos') results = solver_manager.solve(model, opt='cplex') It returns the following error when I run the…
Golnar Karimifar
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Get variable results from failed run in neos using bonmin for a MINLP

I'm using the neos-server to solve a highly constrained MINLP, using the bonmin algorithm. Solving using either a Branch and Bound or the hybrid method. The input code is AMPL I want to know if it's possible to output variable results for a failed…
user_123
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How to write a simple MPS file to submit to NEOS servers

I'm trying to find an open source lp solver that is fast enough to my problem. I'm trying to build a MPS file so I can submit it to NEOS servers and compare the performance of different solvers. My problem involves, at its most difficult cases,…
Fausto Richetti Blanco
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BadStatusLine error when running AMPL on NEOS server

I was trying to run AMPL code on NEOS server from local machine through Kestrel as described on AMPL website: run ampl on neos. I used a simple model file with the following options in it: option solver "/home/arthur/amplide.linux64/kestrel"; option…
kitsune
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setof in model data and script files for NEOS server

In submitting my AMPL formulation to the NEOS server, why does the below codeline using the `setof' operator work fine in a model file but not in a data file? set X := setof {indices in Y} subsetofindices The NEOS server requires the code be…
dcl04
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Strange errors using NEOS server

Im trying to use NEOS server and I get the following error: Im getting this using both MINTO solver and Gurobi solver. I dont get this error when I conduct optimization at my work, but I do using my home computer. Does anyone have any idea how to…
Cenderze
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Need to remodel to avoid infeasiblity

I'm conducting an optimization in the forestry industry where a set of companies, C, may deduct some lumber from a some assortment set A from a harvest area set I. The param x[I,J,V,T,C,A] variables represents the flow from harvest area I to sawmill…
Cenderze
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AMPL: Subscript out of bound

Hello fellow optimizers! I'm having some issues with the following constraint: #The supply at node i equals what was present at the last time period + any new supply and subtracted by what has been extracted from the node. subject to…
Cenderze
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AMPL: Model terminals within a destination city

I've encountered a problem which I have not found any solution to reading the AMPL documentation of sets. What I want to model is that a city, say Kir, must have for instance 9 deliveries from another city, for instance Sto. However, these…
Cenderze
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