Here is a simple example of getting a single-list XYZ grid to be broken up into rows and columns using... these tools are VERY handy for parsing and managing complex lists of data.
Hint: Dynamo needs tools more like these!
A Hermite Spline through a Single-List grid of XYZ points...
A list of Hermite Splines passed through a List of Lists. Slice List is organizing the data by row. Using 'Transpose', we can flip the nesting to get the splines to pass through columns.
Overall Dynamo graph...
