[image] when I code like this , it leads a error [image]

Hi，very thanks for replying，i think the problem is that the P and M are a keysets，so x[p,:] makes a error, i find a method ,change the code P = keys(data[“plants”]) to P = collect(keys(data[“plants”])), so the problem addressed. [image]

Positing screenshots of snippets makes it difficult to help [image] Please read: make it easier to help you Meta Discussion Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement…

At a minimum, you need to show us what data and x are. It looks like data might be some kind of nested Dict but I can’t really tell.

The Julia source code is here: https://github.com/jump-dev/JuMP.jl/blob/master/docs/src/tutorials/linear/cannery.jl If you’re trying to copy the tutorial, you probably made a typo somewhere. Just copy-paste from the Julia file. If you’ve changed the data, then please provide a reproducible exampl…

I can confirm that code produces an error julia> includet("/tmp/cannery.jl") ERROR: MethodError: no method matching getindex(::Base.KeySet{String, Dict{String, Any}}, ::Colon) Stacktrace: [1] _getindex_recurse(data::Tuple{Base.KeySet{String, Dict{String, Any}}}, keys::Tuple{Colon}, condition::typ…

What is import Pkg; Pkg.status()? Are you using an old version of JuMP?

perhaps that’s the problem, because I tried on Julia 1.6 and my JuMP is v0.21.10

my JuMP is v0.21.10 Yes, please update your packages. (JuMP is now 1.0! JuMP 1.0.0 is released | JuMP If you update, you won’t have problems like this breakage in future.) Here’s the tutorial from JuMP v0.21: https://jump.dev/JuMP.jl/v0.21/tutorials/Mixed-integer%20linear%20programs/cannery/

Hi, i tried to code Pkg.update(“JuMP”), but my JuMP version is still v0.21.10, so how can i update my JuMP to v1.0.0? very thanks!

[image] [image] i’m really confused

A problem with JuMP Tutorial-linear problem-cannery problem

Specific Domains Optimization (Mathematical)

Elmo April 1, 2022, 11:00am 11

You probably have some dependency that prevents you from updating JuMP, check this thread out.

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A problem with JuMP Tutorial-linear problem-cannery problem

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