Questions tagged [cplex-python-api]

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1answer
64 views

Accessing Lagrange Multipliers in CPLEX

I want to get the lagrange multipliers for a solution from cplex. I am using it via Python. The problem is continuous with a linear objective function and elements of solution vector $x$ are ...
3
votes
2answers
76 views

Implementing NLP as QP on docplex

I wanna learn how to solve non-linear programs using the docplex library. according to this link I should be able to run the model as a QP. But when running the model I got the error: ...
4
votes
1answer
80 views

Binary variables with multiple indices

I'm new to Cplex and I'm working with the python API. I have a variable $w^t_{iksm}$ and I could just find the binary_var_cube function which only accepts 3 indices. I'm then using this $w$ to define $...
3
votes
1answer
63 views

How to collect solutions within CPLEX and retrieve them from PYOMO?

I would like to seek some advice on modeling the following: I am currently to invoke solvers, CPLEX, in particular. As I am solving my problem sequentially, i.e., the top-level subproblem results are ...
1
vote
2answers
112 views

GAMS default Solver doesn't use much of my RAM and CPU

I noticed that when i run solver via gams ide or python api i dont use more than ~33% of my RAM. Is there a artificial barrier which i can put up or disable?
2
votes
0answers
58 views

Node ordering in Graph optimization

I'm solving a network optimization problem which is modeled as a graph $G=(V,E)$. Solving this problem using Pulp and NetworkX in Python and ordering the graph's nodes in a certain order (i.e. (1,2,3,...
2
votes
1answer
146 views

VRPTW implementation

Does anybody have an example of the vehicle routing problem with time windows (VRPTW), implemented on Python with CPLEX library, AMPL, or MiniZinc? So far I've looked into ...
3
votes
1answer
95 views

Benders implementation on Cplex is very slow

I'm working on a location problem and I have an issue with the Benders decomposition. I'm using Cplex with Python. I coded a single cut and a multi-cut to compare. The single-cut implementation takes ...
1
vote
0answers
50 views

CPLEX keeps restarting in Pyomo

I tried running my model by adding the following settings to CPLEX. ...
3
votes
1answer
179 views

CPLEX Python API Manual with References

I am currently attempting to code a model using the Python API. However, the IBM Site seems to not have one that is similar in formating and content depth such as those for C++ or Java (examples and ...
5
votes
1answer
417 views

CPLEX Python API

I am trying to run the following optimization problem at Python by using the CPLEX API: $$\min \{x_1 + x_2\ | \ x_1 \geq 3, x_2 \geq 2, 2x_1 + x_2 \geq 9\} $$ I just want to give a matrix of ...