Hi Folks,

I'd like to use Cadabra2 to do the hard work of tensor gymnastics before passing the results onto Python/sympy to generate C code. Suppose I have this code

```
{a,b,c}::Indices(position=fixed,values={x,y,z}).
{x,y,z}::Coordinate.
ex := A_{a} A_{b};
rl := {A_{x}=Ax,A_{y}=Ay,A_{z}=Az};
evaluate(ex,rl,rhsonly=True);
```

This produces a Cadabra expression with two indices. How can I create an object that I can pass to the codegen tools of sympy? I'd be happy with a way to pass individual components of "ex" to sympy (and run a loop over all components). Even better would be a way to construct a sympy matrix that contains all 9 components of "ex".

Cheers, Leo