Can JuMP.jl create a sparse array variable that can be used as a full matrix?

[iiitr]

Thank you very much for your reply! The code you provided is very helpful.

On the basis of the solution you provided, I raised a new question. If you have time, I’d like to ask you for help!

How to extend the JuMP @variable so that it can construct a sparse array which can be used as a full matrix?

Hi all In fact, this question is a derivative of my last question. https://discourse.julialang.org/t/can-jump-jl-create-a-sparse-array-variable-that-can-be-used-as-a-full-matrix/69114/2?u=iiitr I want to create a 4x4 array variables, but it only has a value at the index (1, 2), (2, 1), (2, 3), (3, 2) and the rest is 0. @blegat provide several solutions, one of which best meets my expectations, as follows: model = Model() x = zeros(AffExpr, 3, 3) x[1, 1] = @variable(model, base_name = "x[1, …