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.
Questions tagged [neos-server]
27 questions
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vote
1 answer
AMPL: A big set within the set and specification of data
I'm doing a model at the moment which I need to adjust in quite a big way. Basically I need to extend my current set V which is a set of cities to become a set of cities and time. For instance, the element Kir in V must be extended from simply "Kir"…
Cenderze
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0 answers
Solving MILP with NEOS server-variable will not display
I have submitted a mixed integer linear program to NEOS server to be solved. I am using CBC solver using AMPL commands. My command file contains two lines:
solve;
display x;
When I used a small dataset to test it out, the results were emailed to me…
user3527044
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- 1
1
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1 answer
Display variables using CBC MPS input in NEOS
Am trying to use NEOS to solve a linear program using MPS input.
The MPS file is fine, but apparently you need a "paramaters file" as well to tell the solver what to do (min/max etc.). However I can't find any information on this online anywhere.
So…
user3043991
- 49
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- 3
0
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2 answers
How to read a GAMS gms file into ROI (R Optimisation Interface)?
I have a NLP model written in GAMS and I would like to use ROI (R Optimisation Interface) to send it to the NEOS Server.
It looks like ROI_read() is the command for reading in external models, but I don't know how to find out or install the correct…
Simon Woodward
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1 answer
Syntax error context: >>> data; <<< issue in NEOS, using AMPL
I'm new to AMPL/NEOS and optimization problems in general.
I have a mod file that looks like this:
PARAMETERS
param n; # number of observations
param p; # number of features
param ResponseVariable{i in 1..n}; # continuous response variable
param…
The_Noob
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- 1
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0 answers
Retrieve bit string from NEOS
I am trying to solve an LP file(Link to google drive if you would like to try it) via CPLEX on the NEOS servers. I can find the objective value quite easily, that being 9.200000000000e+01. However, I am also looking for the bit string to let me know…
Stephen Smith
- 35
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2 answers
solve a nonlinear model with DICOPT solver in Pyomo
How can I solve a nonlinear model with DICOPT solver in Pyomo?
Is this possible to use DICOPT solver through Neos for Pyomo?
Golnar Karimifar
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- 3
0
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1 answer
Is NEOS solver in Pyomo package updated?
As per the link from NEOS twitter page, they say an Email address needs to be added before submitting the job. Is the pyomo for NEOS solver updated accordingly? Please find the links below for more…
kishan ts
- 3
- 2
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1 answer
WARNING: NEOS is temporarily unavailable. - Pyomo
I'm trying to learn how to send an optimization problem to NEOS Server to solve it with BARON, but I'm receiving an error which says NEOS is currently unavailable even though I've been trying it for some time. I've seen that there exists another…
0
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1 answer
Pyomo - WARNING: NEOS is temporarily unavailable
I am trying to solve a problem by submitting it to NEOS and using ipopt as a slover:
solver_manager = SolverManagerFactory('neos')
results = solver_manager.solve(self.miqp_instance, opt='ipopt', load_solutions=True, tee=True)
…
Betty
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1 answer
Cannot evaluate constraint(s) at starting point
I am using MINLP with NEOS solver, my problem is non-convex and I get this
Cannot evaluate constraint(s) at starting point
what does this mean and how I can fix it?
user12036223
0
votes
0 answers
Different results for identical optimization models, except for cost coefficients in objective function: Neos, Bonmin, Ipopt
I'm using the neos bonmin solver to find a global minimum solution to a highly constrained mixed integer non-linear problem. Below are results for models that are identical, except the coefficients in the cost objective function are smaller for the…
user_123
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