Suppose I have a `Matrix`

, and I only want the upper triangular values stored in a `Vector`

:

```
julia> A = [1.0 2.0 3.0; 4.0 5.0 6.0; 7.0 8.0 9.0]
3×3 Matrix{Float64}:
1.0 2.0 3.0
4.0 5.0 6.0
7.0 8.0 9.0
julia> UpperTriangular(A)
3×3 UpperTriangular{Float64, Matrix{Float64}}:
1.0 2.0 3.0
⋅ 5.0 6.0
⋅ ⋅ 9.0
```

How do I get `1.0`

to `9.0`

from `UpperTriangular(A)`

?