Tableau lets you plot virtually any function - f(x,y) - without actual data. That is: out of 2 distinct records.
You may check this out here: Tableau Public
As an example of a simple 2D f(x) I chose sine & cosine - both parameters driven:
Tableau does not support 3D plots but color may be used as the 3rd dimension substitute. Such a function can take x & y as arguments.
[x,y] pair may be considered complex plain - where z=x+iy - for example:
Or just any f(x,y):
I hope someone finds it interesting