Probably a stupid question… but *why* is:

```
julia> maximum([1,NaN])
NaN
julia> minimum([1,NaN])
NaN
julia> 1 > NaN
false
julia> 1 < NaN
false
```

…I have a rectangular matrix of (possibly complex) vectors, of which 2 elements have zero length – so I replace them with NaN for plotting reasons. Then I want to find the non-NaN element in this matrix of vectors with the largest real part.