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
4
votes
2 answers
Optimisation Variable with two indices and different index length in JULIA JUMP
I want to solve an optimization problem in Julia.
I am trying to define a binary variable x_{r,i}
Thereby, the length of the sets of both indices is not the same.
Let's say there is r_a and r_b, but for r_a there are i_1 and i_2 whereas for r_b…
tofri
- 43
- 5
4
votes
1 answer
how to write "then" as IP constraint in Julia
Hello fellows, i am learning Julia and integer programing but i am stuck at one point
How to model "then" in julia-jump for integer programing leanring.
Stuck here here
#Define the variables of the model
@variable(mo, x[1:N,1:S],…
sana ullah
- 43
- 3
4
votes
1 answer
Retrieve constraints matrix from Gurobi or MOI or JuMP in Julia
I want to retrieve an LP model in matrix form from Gurobi. I am using package JuMP in Julia. I can print all the constraints using MathOptInterface but not in matrix form. I have no idea how to print the problem matrix from Gurobi. Could anyone help…
Hongyu
- 183
- 5
4
votes
1 answer
Jump simple graph path problem, why is it looping?
I want to have x vehicle which goes on a graph going from vertex 1 and ending in the same all vertices as to be seen one time by one and only one vehicle (for those who know, i'm interesting in a PDPTW problem, but i'm stuck at this point)
using…
victor roy
- 51
- 1
4
votes
2 answers
Julia: ctrl+c does not interrupt
I'm using REPL inside VScode and trying to fix a code that gets stuck inside a certain package. I want to figure out which process is taking time by looking at the stack trace but cannot interrupt because REPL does not respond to ctrl+c. I pressed…
user15988
- 143
- 2
- 8
4
votes
1 answer
How to specify a variable in JuMP that can only be 0 or 1?
What is the syntax for specifying a variable in a JuMP optimization problem that can only be 0 or 1?
I am using the following code:
@variable(mod, X == 1 || 0)
but it is not working.
rmae19
- 77
- 3
4
votes
1 answer
Dimension mismatch in Julia
I created a matrix A, which is 300x4 array.
And in the objective, i should minimize A*x, where x is a 1x4 vector.
and my code is the following:
k = 3
m = length(u)
n = k + 1
A = zeros(m,k+1)
for i = 1:m
for j = 1:k+1
A[i,j] =…
Thea G
- 41
- 4
4
votes
2 answers
To strictly define a column vector (matrix with one column) in Julia
I am wondering about the simple way to strictly define a column vector in Julia, for example, I want a 3-row column vector B:
julia> columnVectorB
3×1 Array{Float64,2}:
1.0
2.0
3.0
While I think the normal way is:
julia> columnVectorB = [1.; 2.;…
Edward
- 554
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4
votes
1 answer
How to get constraints in matrix format from Gurobi/JuMP?
I have built an LP model in JuMP/Julia using Gurobi solver. I wish to visualize the constraints for checking the overall correctness of my model. In python, we can define a function help to visualize the constraints. Please follow the link below for…
NIT_GUP
- 97
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- 5
4
votes
1 answer
Julia+JuMP: variable number of arguments to function
I'm trying to use JuMP to solve a non-linear problem, where the number of variables are decided by the user - that is, not known at compile time.
To accomplish this, the @NLobjective line looks like this:
@eval @JuMP.NLobjective(m, Min,…
Daniel R. Livingston
- 1,227
- 14
- 36
4
votes
1 answer
JuMP: How to get multiple solutions from getvalue(x)
I'm solving this Multi-Objective problem
f1(x,y) = x
f2(x,y) = (2.0-exp(-((y-0.2)/0.004)^2)-0.8*exp(-((y-0.6)/0.4)^2) )/x
isdefined(:f1) || JuMP.register(:f1, 2, f1, autodiff=true)
isdefined(:f2) || JuMP.register(:f2, 2, f2,…
sparkle
- 7,530
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4
votes
1 answer
Create local variables programmatically from a dictionary in Julia
Consider the following function:
function func(vars::Dict{Symbol, Any})
end
I want to create local variables in a func's scope,
where:
variable names are each the key of the vars and
variable values are values in a vars corresponding to the given…
aberdysh
- 1,634
- 2
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4
votes
1 answer
How to do "for all" in sum notation in Julia/JuMP
I am trying to add constraints to a linear optimization problem in Julia using JuMP. I am using the sum{} function however, I am having trouble with some of the constraints. Does anyone know how to write "for all" in JuMP (the upside down A)? Here…
Cam
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3
votes
1 answer
How does one elegantly initialize start values or parameter values when creating a julia JuMP parameter or variable container?
Was hoping a Julia or JuMP expert could help me on how to do the following (apologies as I am new to the language and tried all resources but cannot find a solution to this problem)
I am trying to initialize the start values of all variables when…
Adam
- 313
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- 11
3
votes
2 answers
UndefVarError in Optimization Using JuMP
I'm trying to code an optimization problem in Julia using JuMP. The objective function has two matrix multiplications.
First, multiply the vector of w with size (10) by the matrix of arr_C with size (20, 10). So the w should be transposed to size…
Shayan
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