Antonio, I think the simple answer is No (at least as far as I am aware). However, I am intrigued by your question, and it raises two of my own. 1. Why do you want to do this? (Maybe there is some other way of doing what you are trying to do.) 2. You mentioned only two points (A&B). Do you have some tangency or other constraints at the ends? If not, of course, it's just a straight line. Finally, a general suggestion. If you have other software which can derive your desired equation from a series of points, you can create Datum Points on your curve and export their coordinates to whatever equation extraction software you might have. David
