Convex.jl - LoadError: UndefVarError: AbstractExpr not defined

Specific Domains Optimization (Mathematical)
1

I am using Julia 1.5.3 but running some old code based on Julia 0.6.4 and ran into the following problem: LoadError: LoadError: UndefVarError: AbstractExpr not defined. The problem seems to be AbstractExpr no longer being recognized in Convex.jl. The code snippet is included below

using Pkg
Pkg.add(“SCS”)
Pkg.add(“Convex”)

function partialtranspose(ρ::Union{AbstractArray, AbstractExpr}, systems::Vector, dim::Vector)

Any help or suggestions is greatly appreciated.

2

If you download Julia 0.7 and run the code there it should give you deprecation warnings telling you what you need to modify.

3

Many thanks, the code runs in Julia 0.7. This gives me the base to migrate to 1.5.3.

4

It’s just not exported anymore, but you should be able to do

using Convex: AbstractExpr

to bring it into your namespace. By the way, Convex.jl now has a partial transpose function, so you may not need to define it yourself.

2 Likes