Differences between 0.7.0 and 0.8.4

[s3baki]

I inadvertently closed the previous item while attaching files.

[s3baki]

How I use the code in 0.7.0:

using MathProgBase # version v0.7.8
using Clp # version v0.7.0

linprog(obj, a, '=', rhs, lb, ub, ClpSolver(MaximumIterations = maxiter, MaximumSeconds = maxtime, SolveType = solvetype))

[s3baki]

How I use the code in 0.8.4

using JuMP # version 0.21.10
using Clp # version 0.8.4

function decision_solver(
obj::Vector{Float64},
a::Matrix{Float64},
rhs::Vector{Float64},
ub::Vector{Float64},
lb::Vector{Float64},
maxtime::Int64,
maxiter::Int64)
model = Model(Clp.Optimizer);
@variable(model, lb[i] <= x[i=1:length(lb)] <= ub[i]);
@objective(model, Min, obj'x);
# Depending on the sense vector, you may need to split it into <= and >= constraints too
@constraint(model, a * x .== rhs);
JuMP.set_optimizer_attribute(model, "LogLevel", 0)
JuMP.set_optimizer_attribute(model, "MaximumIterations", maxiter)
optimize!(model);
status = Symbol(lowercase(string(termination_status(model))))
if status in [:infeasible, :dual_infeasible]
JuMP.set_optimizer_attribute(model, "SolveType", 1)
optimize!(model);
status = Symbol(lowercase(string(termination_status(model))))
end
if status != :optimal
return (status, 0.0, Vector{Float64}())
end
sol = value.(x)
objval = objective_value(model)
return (status, objval, sol)
end