Variables declaration in JuliaPro 1.5.2-1

Specific Domains Optimization (Mathematical)
1

When compiling @variabel on my model, julia displays the following message

Expected ModeloDeterministico to be a JuMP model, but it has type DataType
error(::String, ::Type{T} where T) at error.jl:42
validmodel(::Type{T} where T, ::Symbol) at macros.jl:279
top-level scope at macros.jl:284

Is there another way to declare variables?
I tried to follow a macro but the message kept showing

2

The error message is telling you that ModeloDeterministico should be an instance of type JuMP.Model, but you actually have a type. If you can create a reproducible example of the problem, it will be easier for us to figure out what went wrong.

Most likely, you have something like:

# This makes `ModeloDeterministico` just another name for the *type* Model
ModeloDerministico = Model

instead of:

# This actually creates a new *instance* of a `Model`
ModeloDerministico = Model()
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4 
using JuMP,Cbc
ModelD = Model()
ModelD = Cbc.Optimizer

a = 1:4
A = a

@variable(ModelD,b[A], lower_bound=0, Bin)

In the first compilation this error appeared: In @variable(ModelD,b[A],lower_bound = 0,Bin): Unrecognized keyword argument lower_bound

And in the second compilation this error appeared again: Expected ModeloD to be a JuMP model, but it has type DataType

5

Which version of JuMP are you using? The syntax you are using is for JuMP v0.19 and higher

6

This line is the problem. You are making ModelD just an alias for the type Cbc.Optimizer.

7

Understand. I put Cbc.Optimizer because it was a suggestion that appeared in Julia for the compilation

8

@rdeits Was this the correct way?

ModelD = Model(with_optimizer(Cbc.Optimizer))
9

@blegat I’m using JuliaPro 1.5.2-1

10

Please read the documentation: https://jump.dev/JuMP.jl/stable/quickstart/

You want ModelD = Model(Cbc.Optimizer).

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12

Even though I used ModelD = Model (Cbc.Optimizer) the error message continues: MethodError: no method matches Model (:: Type {Cbc.Optimizer})

I did until the update and the package rm and add again but the error continues.

using JuMP,Cbc
ModeloD = Model()
ModeloD = Model(Cbc.Optimizer)
a = 1:4
A = a
@variable(ModeloD,b[A],lower_bound=0,Bin)
13

After updating packages, you need to close Julia and re-open for the changes to take effect. You need JuMP 0.21 for Model(Cbc.Optimizer) to work.

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