All Questions
Tagged with cplex python-3.x
55 questions
0
votes
1
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28
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Docplex use for timeseries based variables
I am trying to model an optimisation problem where each item in a list is essentially power generated at that hour. I am trying to minimise the amount of energy stored while still getting the same ...
- 23
0
votes
1
answer
43
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Limit the memory used when solving using docplex
I am implementing a mathematical model using docplex and the academic version of CPLEX.
I am attempting to solve very big problem instances.
I faced a MemoryError.
Is there a way to overcome this? I ...
- 132
10
votes
3
answers
25k
views
How to resolve `np.float_` was removed in the NumPy 2.0 release. Use `np.float64` instead error from docplex?
I'm trying to rerun an older code (about a year old). I have installed academic version of CPLEX 22.1.1 version and Python API and docplex in python.
However, the dependencies have changed and ...
- 101
-1
votes
1
answer
427
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Creating and/or logic between constraints DOcplex python
I'm trying to transfer my constraints from Cplex OPT studio to the DOcplex Python.
The logic between the constraints is - if 1 of them does not met all the decision variables needs to be 0.
In Cplex ...
0
votes
0
answers
541
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CPLEX DOcplexException on Mac big sur(M1)
from docplex.mp.model import Model
opt_model = Model(name = 'Linear Program')
x = opt_model.continuous_var(name = 'x', lb = 0)
y = opt_model.continuous_var(name = 'y', lb = 0)
c1 = opt_model....
- 421
0
votes
2
answers
651
views
docplex.mp.utils.DOcplexException: Expecting sequence of linear constraints, got: docplex.mp.QuadraticConstraint[]
Please pardon my ignorance. I was trying my understanding on Docplex. I produce this code to model optimization equations as shown in the picture below. My main concentration is constraint 2c, I can't ...
- 135
1
vote
1
answer
962
views
CPLEX with student edition on google colab
I have google colab but I get the warning for using CPLEX and Docplex :
9 frames
CplexSolverError: CPLEX Error 1016: Community Edition. Problem size limits exceeded. Purchase at http://ibm.biz/...
- 11
0
votes
1
answer
893
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How to install CP Optimizer 20.1 with docplex?
I am installing docplex using pip install docplex and it shows:
Successfully installed docplex-2.22.213
When I run the code it says:
- CP Optimizer 12.10.0.0 -
But since the latest ILOG CPLEX ...
- 904
1
vote
1
answer
1k
views
Linear Programming: List of all solutions generated using DocPlex in PYTHON (failing with the cplex solution pool)?
I am actually facing an issue in the resolution of a problem. My problem is a Liner Programing problem with optimization of the food diet and minimization of the cost. As the problem is similar to ...
- 11
0
votes
1
answer
348
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docplex.cp.model out-of-memory running on a cluster
I am trying to run the following docplex.cp.model with a large dataset. This is with some sample data:
import numpy as np
from docplex.cp.model import CpoModel
N = 180000
S = 10
k = 2
u_i = np.random....
- 904
0
votes
1
answer
98
views
Maximize revenue with deadline
Given three interval variables say
a = mdl.interval_var(name='a',start=(0,10),end=(0,10),size=5) #have revenue of 10
b = mdl.interval_var(name='b',start=(0,10),end=(0,10),size=5) #have revenue of 5
c =...
- 18.6k
0
votes
1
answer
196
views
DOcplexException: Expression xx cannot be used as divider of xxx
I am new to CPLEX and I was trying to find an example where the decision variable is in the denominator of the objective function but couldn't. My optimisation problem;
I have tried the following on ...
- 904
0
votes
1
answer
135
views
Get the value of resource used
Given the code below (example from:https://www.ibm.com/docs/en/icos/20.1.0?topic=f-pulse)
from docplex.cp.model import CpoModel, INTERVAL_MAX
import docplex.cp.utils_visu as visu
mdl = CpoModel()
a1=...
- 18.6k
7
votes
1
answer
1k
views
Cplex installation "Could not find a version that satisfies..." and "No matching distribution" for Apple M1
I am trying to run cplex on my M1. I am hoping I can get it to run on python 3.8/9 because I also need to run tensorflow (which I run through miniconda for M1). When I try to pip install it within the ...
- 155
1
vote
1
answer
103
views
Performance for recurring doopl calls
I'm using doopl.factory to solve multiple linear programs in a loop. I noticed a decreasing performance while looping through instances. Using memory_profiler shows that the memory increases after ...
- 21