Hi everyone,

I just change to JuMP 0.19 and I get some problem with my code.

I construct a big JuMP model with a lot of specific variables and constraints, and I want to extract constraint matrix and vectors from the model constructed with JuMP:

Min c*x

s.t. l <= Ax <= u

lb <= x <= ub

I write, 2 years ago the following piece of code, I don’t know if it was optimal, but it worked

```
JuMP.build(model)
c = MathProgBase.getobj(JuMP.internalmodel(model))
A = MathProgBase.getconstrmatrix(JuMP.internalmodel(model))
lb = MathProgBase.getvarLB(JuMP.internalmodel(model))
ub = MathProgBase.getvarUB(JuMP.internalmodel(model))
l = MathProgBase.getconstrLB(JuMP.internalmodel(model))
u = MathProgBase.getconstrUB(JuMP.internalmodel(model))
```

But know, with JuMP 0.19 and MathOptInterface, it doesn’t work anymore and I didn’t find anything in documentations or any topics related. Can anybody indicate me where to find information or what is the best thing to do?

Thank you in advance.

Regards

Jonathan