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Questions tagged [docplex]

docplex (a.k.a. IBM® Decision Optimization CPLEX® Modeling for Python) is a Python modeling API that provides modules for mathematical programming via CPLEX and constraint programming via CP Optimizer.

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Python DOcplex how to get end and start value for interval_var

I am trying to model a scheduling task using IBMs DOcplex Python API. The goal is to optimize EV charging schedules and minimize charging costs. However, I am having problems working with the CPO interval variable. Charging costs are defined by…
can_k
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Formulate strict constraints in docplex

I am trying to model the following strict constraint in python with docplex: mdl.add_constraint(sum(a[i] * mdl.variable[i] for i in range(nrItems)) > b) but I keep getting the error: docplex.mp.utils.DOcplexException: Unsupported relational…
Vjola Cl
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Can not Deploy Cplex Model as WebApp to cloud (Streamlit Share) using IBM CPLEX Academic Initiative

I have built the Cplex Model for scheduling in Python, here I am using IBM CPLEX Academic Initiative. I have also created simple WebApp (With basic UI of uploading data to feed to the model & getting result) for my model using Streamlit, it works…
Gops
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Objective function definition for MIP using docplex

import numpy as np rnd = np.random rnd.seed(0) n = 6 t = [i for i in range(1, n)] V = [0] + [i for i in range(1, n + 1)] o = 5 operator = [o for o in range(1, o)] precedence = [[1, 2], [1, 3], [3, 5], [2, 4], [4, 5], [4, 6], [5, 7], [6,…
bihatunkisi
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Docplex Interval Variable constrained within a shift

I write a docplex model and I want some tasks to be constrained to start and end within the same shift (half a day, in that specific case). for t in tasks_list: task[t] = mdl.interval_var( start=[0, max], size=duration[t], …
Yop
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Cplex: how to display this linear program in Cplex

enter image description here How do i write this constraints in CPLEX (linear-program)? ∑ j∈M until ∑ k=i xaijk ∗ bkj = dai, ∀i ∈ N, ∀a ∈ B ∩ A1; until = min(i + va, n)
Trí Vũ
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How to create piecewise linear relationship in DOcplex efficiently?

I am able to create a piecewise-linear relationship with DOCplex. In fact, it is just the plain absolute value function. Abs = mdl.piecewise(-1, [(0, 0)], 1) mdl.add_constraint(buy_var[i] + sell_var[i] == Abs(buy_var[i] - sell_var[i]),…
qqzj
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CPLEX/DOCPLEX Run Time Problem on Apple Silicon

I installed CPLEX Studio 22.1 on my Apple Macbook (M2 CPU). Almost everything seems to be fine: I can call cplex and cpoptimizer interactives from /Applications/CPLEX_Studio221/cplex/bin/x86-64_osx/cplex and…
P. Kein
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How to set up academic version of CPLEX with anaconda in Linux?

I try to set up CPLEX 22.10 for use with anaconda3 (3.9.12) on Ubuntu 22.04 but > python -m docplex.mp.check_list always states that ! Cplex promotional version, limited to 1000 variables, 1000 constraints Note: I have the academic version of…
Mike.K
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DOcplex: the dual of the dual is not the same as primal?

I have a very simple primal problem defined like this: mdl = Model(name='tubs_primal') aqua = mdl.continuous_var(name='aqua') hydro = mdl.continuous_var(name='hydro') typhoon = mdl.continuous_var(name='typhoon') pump = mdl.add_constraint(aqua +…
qqzj
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How can I add objective for scheduling model to count the present decision variables to be specific value using CPlex Python?

I am working on the scheduling problem where I want to add an objective according to such condition. So is there any way to count the present interval variables (like presence_of()) to apply some condition for an objective? Thanks in advance!
Gops
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How to maintain the presence of group of Interval variables in scheduling problem using Cplex Python?

So basically I have a scheduling problem where all tasks (interval variables) are optional and it belongs to different groups. Like as an house building problem, but here I have different tasks (not same at all) for different houses and I want to…
Gops
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How to define weights number by using Docplex set_multi_objective

I am working on MILP problem based on 'ucp-panda' example case. I hope to use set_multi_objective to generate Pareto frontier with interation. However, when I am using different weights, For example expr = [mdl.cost, mdl.co2] weights = [0.1,…
Guangxuan wang
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Print the dual model via docplex

I have developed a linear program and implemented it in Python via docplex. I would like to know how one can print the dual model using docplex? I have seen similar posts for other programming languages, but I was unable to find relevant discussions…
mdslt
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DocPlex - Operational Research/Optimization Problem - Support to implement in DOCPLEX - Python

I have been trying to implement an optimization problem in Docplex using Python API. Although I have already done some problems in Docplex I am facing some challenges to do this one. We have got rho as correlation element's matrix, V is the set of…
Leon Medeiros
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