Is it possible to define equations using looping constructs, or is there a “correct” way to implement the following systems of equations,

```
N=3;
@parameters μ ϵ η_ω η_a A β[1:N] ω[1:N] θ[1:N, 1:N]
@variables z[1:N^2+3*N + 1](t) D_train(..) P(t) W[1:N, 1:N](t)
eqs1 = [Equation(D_train(t), 2 * cos(4 * t + pi/2) + 1.5 * cos(8*t + pi/5) + 1.8 * cos(12 * t + pi/12))
for i in 1:N
for j in 1:N
if i!=j
D(W[i,j]) ~ A * (exp(im * z[9 + 3*(i-1) + j]/ω[j] ))
end
W[i,i] ~ 0
end
]
```

Any help is deeply appreciated.