I have used the ModelingToolkit, DifferentialEquations, and OrdinaryDiffEq packages to solve the ODE system.

In the past, I have implemented the set of variables x as a vector like:

```
@variables (x(t))[1:m]
```

Is there any way to implement the set of variables as a matrix instead of a vector? For I need the variables x as a m by m (m^2 variables in total).

Thank you for your time and consideration.