I would like to convert a SymPy expression in order to use as an objetive function in JuMP. Suppose my variable involves two variables p [1,1] and p [1,2].

```
using SymPy
using JuMP, Ipopt
# expr is my SymPy expression
fn = lambdify( expr )
```

Now, my model

```
model = Model(Ipopt.Optimizer)
l = zeros(1,2)
@variable(model, p[ j = 1:S] >= 0 )
#obj function
@objective(model,Min,fn)
print(model)
The objective function `#99` is not supported by JuMP.
```