JuMP is a domain-specific modeling language for mathematical programming embedded in the Julia language.
JuMP is a domain-specific modeling language for mathematical programming embedded in the Julia language.
Questions tagged [julia-jump]
362 questions
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How to define variables separately where you need to index over a list of lists?
I'd like to define a binary variable x_ijk where i in I is an n-element Vector{Vector{Int64}}, k in K is an n-element Vectors, and j in J is a m-elemts vectors.
Always the length of K is equal to the number of vectors in I. How to index over each…
user9990604
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1 answer
Julia JuMP feasibility slack of constraints
In Julia, by using JuMP am setting up a simple optimization problem (MWE, the real problem is much bigger).
model = Model()
set_optimizer(model, MosekTools.Optimizer)
@variable(model, 0 <= x[1:2])
@constraint(model, sum(x) <= 2)
@constraint(model, 1…
independentvariable
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In Julia using StochasticPrograms.jl and using @sampler micro, how to define a sampler which matches a 2 dimensional @uncertain variable?
This matter is partially discussed here:
In Julia using StochasticPrograms.jl package how can I get the @sampler object as a n*m matrix not a vector?
But there are significant new issues in this question:
In the julia programming language I use…
alex_nas
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get value of a uncertain variable in Julia JuMPeR
I want to solve a robust optimization problem with Julia JuMPeR. Is there any way to get the values of uncertain variables in the solution in Julia JuMPeR? I am using Julia v1.5.
user17842187
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2 answers
Instead of defining an objective function, gradient, and hessian function seperatley, can you have one function return all?
Is there a way in JuMP to define a function that returns for example a tuple containing the objective function and the gradient, which you can pass to register?
In the documentation :…
Eigenvalue
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2 answers
How to have conditions for constraints?
How can I code a constraint like this in JUMP?
Suppose i,j,k,m are indices and capital letters associated with them are set, like J.
x_{i,j,k,m'} + sum((j in J, k in K), y_{j,k,m})<= z_{i,m} for all i in I and for all m and m' in M ; m !=m'
just…
Hemfri
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1 answer
Ctrl+C does not interrupt optimize!() regardless of solver
The problem pertains to JuMP, an optimization package for Julia. I realize this problem is likely specific to my machine; however, I have tried many of the obvious remedies with no luck.
When I run a JuMP model using optimize!(), I cannot interrupt…
PippyEnjoyer
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1 answer
In Julia using StochasticPrograms.jl package how can I get the @sampler object as a n*m matrix not a vector?
In the julia programming language I use StochasticPrograms.jl package to model a two stage stochastic problem. I use @sampler object to develop scenarios and random values. The random variable follows a normal distribution. The @sampler output…
alex_nas
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1 answer
Constraints of type MathOptInterface.VariableIndex-in-MathOptInterface.ZeroOne are not supported by the solver. When using Ipopt solver in Julia
Need help in resolving issue of Constraints of type MathOptInterface.VariableIndex-in-MathOptInterface.ZeroOne are not supported by the solver. When using Ipopt solver in Julia for BinPacking problem
#variables declaration
@variable(model,…
Dones
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1 answer
How can I remove the "type VariableIndex has no field head" error?
Would you please help me, why the error"type VariableIndex has no field head" was happened when I run the bellow code
using JuMP,CPUTime, Distributions, Ipopt,Juniper,Gurobi
#-----Model…
Soma
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1 answer
How is it possible to collect NLexpression in a loop?
Would you please help me that how I can collect some NLexpressions in a loop?
I Want to keep k8 and k9 for all i=1:10 as scenarios. It means in the end of the loop, Q equal to collection of k8 and k9 under each scenario ( i ). I couldn't define a…
Soma
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2 answers
Coding arrays in constraint JuMP
Please consider the following image:
I know when I use a:b in @constraint it means an array from a to b. I need to code the arrays like {a_j,b_j} in @constraint of the mentioned code. Can you please help me to code that?
Mahsa
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1 answer
In JuMP How can we use VariableRef for mapping values?
I am trying to solve an optimisation problem in Julia Jump using Gurobi Pkg.
I have created 2 matrices (A and B) that should be mapped using the 3rd one (Matrix C).
@variable(model, lb_C[i,j] <= C[i=1:m, j=1:n] <= ub_C[i,j],…
Adi
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2 answers
How to get values from every iteration in JuMP
I'm solving a particular optimization problem in julia using JuMP, Ipopt and I have a problem finding the history of values i.e. value of x from every iteration.
I couldn't find anything useful in documentations.
Minimal example:
using JuMP
import…
1
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2 answers
Julia JuMP Constraint from Vector
I'm practicing with Julia but got stuck trying to make a constraint.
# Server Costs
> df_custos = DataFrame(C1=[2,4,3],C2=[1,2,1],C3=[3,3,2],C4=[6,2,3],)
# City num
> num_cidades=ncol(df_custos)
# Server num
> num_servidores =…
Yuri
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