... [same as last night], refactored a bit, notes added.
The X_Y plot may not carry the 'spline' plot.
The Mathcad original is not given, not to mix the user.
Mathcad is a bit shorter because the construction is "scalar"
it recuperates itself on the final 'z vector' call.
Gorgeous Smath ! worth the visit.

Jean

2D Isometric Copy.sm (77 KiB) downloaded 71 time(s).