Error to show a JuMP model in v0.7/1.0

Specific Domains Optimization (Mathematical)
1 
julia> m = Model(solver=ClpSolver())
Feasibility problem with:
 * 0 linear constraints
 * 0 variables
Solver is Error showing value of type Model:
ERROR: BoundsError: attempt to access 1-element Array{SubString{String},1} at index [2]
Stacktrace:

Is this intended? Also

julia> @show m
ERROR: BoundsError: attempt to access 1-element Array{SubString{String},1} at index [2]
Stacktrace:

But

julia> print(m)
Min 0
Subject to

It can be an issue when JuMP is used in REPL mode, especially for teaching undergraduate students without much coding experiences. Of course, I can add a semicolon at the end. If this issue has been discussed already, please kindly give me a link.

2

https://github.com/JuliaOpt/JuMP.jl/issues/1520

1 Like
3

This is fixed in JuMP 0.18.4.

1 Like
4

“JuMP” => v"0.18.4+"
Julia 0.7

m = Model(solver=IpoptSolver())
ERROR: MethodError: no method matching Model(; solver=IpoptSolver(Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}()))
Closest candidates are:
Model(; caching_mode, bridge_constraints) at /root/.julia/dev/JuMP/src/JuMP.jl:192 got unsupported keyword argument “solver”

5

It doesn’t look like you’ve updated JuMP correctly (it looks like you’re using JuMP from your dev folder). Either use git in that folder to update manually, or try ] free JuMP, ] up JuMP.