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
3
votes
1 answer
How to specify julia project to use different version of JuMP depending on the julia version
How can I specify in julia project's Project.toml that a different version of JuMP should be installed with specific julia versions. I would like to use JuMP 1.3.0 but for example julia 1.0 accepts JuMP versions up to 0.22.3. I would need to thus…
toubinaattori
- 73
- 1
- 1
- 7
3
votes
2 answers
Is it possible to create or access the gap history
In Julia JuMP, I am wondering whether it is possible to access an array, or similar, of the GAP history, the GAP improvements.
I know that at the end of the optimization, I can access the final gap with relative_gap(m) with m of type Model and I…
JKHA
- 1,800
- 11
- 28
3
votes
2 answers
JuMP nonlinear optimization constraints broken to O(1e-9)
I'm running nonlinear optimization using the Ipopt optimizer in JuMP. My objective/cost function relies on the constraints being adhered to strictly. However on some iterations the constraint are being broken.
Specifically, my constraints are s.t.…
Kevin
- 281
- 2
- 5
3
votes
1 answer
How to pass a SymPy expression supported by JuMP
I would like to convert a SymPy expression in order to use as an objetive function in JuMP. Suppose my variable involves two variables
x = Sym("x")
y = Sym("y")
expr = x^2 + y
fn = lambdify( expr )
and the model
model = Model(Ipopt.Optimizer)
l =…
Fam
- 507
- 2
- 8
3
votes
1 answer
Obtaining Irreducible Inconsistent Subsystem (IIS) with JumP - Julia
I am trying to obtain the constraints that are included in the IIS, for example with the following infeasible problem
using JuMP, Gurobi
model = direct_model(Gurobi.Optimizer())
# defining variables
@variable(model, z)
@variable(model, x1[a=1:10,…
Pandu Prianto
- 33
- 4
3
votes
2 answers
For loop with 2 iterators in Julia/JuMP
I need to implement the following pseudocode to JuMP/Julia:
forall{i in M, j in Ni[i]}: x[i] <= y[j];
I imagine something like:
for i in M and j in Ni[i]
@constraint(model, x[i] <= y[j])
end
How do I properly implement the 2 iterators in the…
bakun
- 448
- 1
- 9
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3
votes
2 answers
"Not defined variable" in a 'while loop' in Julia
I am trying to do a sensitivity analysis in Julia using JuMP. Here is my code:
using JuMP, Plots, Gurobi
m=Model(with_optimizer(Gurobi.Optimizer))
@variable(m, x>=0)
@variable(m, y>=0)
@variable(m, k>=0)
k = 0
while k<=1
φ(x,y,k)=3*x+k*y
…
Yorgos
- 183
- 10
3
votes
0 answers
Seminar Scheduling Problem Modeling - Julia
I am trying to learn Julia with optimization problems. I tried to solve a scheduling problem.
Here is the question that I want to solve with Cbc library.
- There are 6 time periods, 10 seminar, 5 speaker, 15 audience, and 4 conference room.
Which…
colss
- 51
- 9
3
votes
1 answer
How to linearize a combination of AND and OR constraints
I have a variable t, and I would like to have the following constraints:
a <= t <= b
and
(c <= t <= d) or (e <= t <= f)
Here is the code I used in Julia:
using JuMP, Cbc, StatsBase
import Random
model =…
Timothée HENRY
- 14,294
- 21
- 96
- 136
3
votes
1 answer
Get branch and bound node count in JuMP/Gurobi
I am trying to get the branch and bound node count using the JuMP interface and the Gurobi solver in Julia.
I tried getnodecount(m) as suggested on the JuMP website, but this came back as undefined. After doing more research, I read to…
Matthew Turner
- 61
- 1
3
votes
2 answers
all subset of a se in julia
would you please help me?
How can I do a code which can find all subset of a set
for example
I want to code this constraint in Julia. It is a subtour constraint. But I don't know how I can find all subsets of S set.
@constraint(ILRP,
…
Soma
- 743
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- 19
3
votes
1 answer
How to evade precompile error using Julia when adding packages
I am trying to use three different packages with Julia programming (with Atom IDE, for what it's worth).
I'm very new to Julia so pardon any ignorance! Here's what I've…
Connor Daly
- 31
- 2
3
votes
1 answer
How to quickly solve a moderate scale QP formulation in Julia?
This is a newbie question. I am trying to minimize the following QP problem:
x'Qx + b'x + c, for A.x >= lb
where:
x is a vector of coordinates,
Q is a sparse, strongly diagonally dominant, symmetric matrix typically
of size 500,000 x 500,000 to…
Bodhisatta Pramanik
- 63
- 9
3
votes
1 answer
Minimize the maximum variable
I have a Mixed Integer Programming problem. The objective function is a minimization of the maximum variable value in the a vector. The variable is has an upper bound of 5. The problem is like this:
m = Model(solver = GLPKSolverMIP())
@objective(m,…
Christian Bay
- 33
- 1
- 5
3
votes
2 answers
Same code doesn't work consistently in Julia
I created a model to solve linear programs in Julia. I solved the linear program first time but the same code doesn't work for a modified program. Can you figure out what's going on?
Thank you!
The code that works fine:
m = Model()
@variable(m,…
Yibo Liu
- 71
- 6