peb@tma1.Sun.COM (Paul Baclaski) (09/08/89)
I recently ran across a book entitled "The Rapid Evaluation of Potentials in Particle Fields" by Dr. Greengard (MIT Press, 1988) which describes an algorithm that calculates the n-body problem with respect to gravitational or electrostatic fields such that the complexity is O(n) rather than O(n^2). It appears to use quadtrees and fields. I would think that if this is possible, source code would be available to do this...or at least an understandable description of the algorithm (the book is rather dry). Please send me pointers to better descriptions, third party analysis or best of all *shareware*/*public domain* software that implements the Greengard algorithm. (If you have Greengard's email address...) Please send me mail directly since I don't read this newsgroup. Thanks in advance, Paul E. Baclaski Sun Microsystems peb@sun.com