Hi, Peter:
I think you want to have an array of different row sizes. I think it's impossible in LabView. At least using only arrays and without clusters.
And as all rows have the same number of elements, undefined elements get default value. In case of numerics, zeros.
You could create an array of cluster elements, and each element be an array 2D. Then each element can be an array of different sizes.
But that's just what you had at start.
Aitortxo.
Aitortxo.