Well, I was able to get Mathematica to plot a half-ellipsoid, which is what I am ultimately looking for. However, Mathematica's high-level functions do all the work, so I still haven't gotten any insight into the actual formula generating the ellipse. Here's a screen shot of the Mathematica notebook, with slider adjustments for the axes.. http://bit.ly/17Z2Ayo
I am able to rotate the view cube in real-time using my mouse, as well as change the length of all the axes using the sliders. So I must have a reasonable GPU in my Dell/Intel laptop. I think that Mathematica lets me publish a "Live" version of this notebook on the web, with active sliders and mouse view rotation, but I haven't figured out how to do that as yet. Skip > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
