Hi Fredrik, so another possible way to make a particular kind of curve is to generate a regular curve made up of many control points, with all the points arranged by the particular formula. That again makes a kind of approximation of the exact curve but with a lot of points it can have only a very small deviation from the exact curve definition.

That sounds like what you were probably doing in Grasshopper already?

If you want to do something similar in MoI, it could be possible to make a plugin that does that kind of a thing - that's actually how the sine wave plugin from this previous post works:
http://moi3d.com/forum/messages.php?webtag=MOI&msg=1519.38

- Michael