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Along with the program, there is a fairly large document that explains the N-Body problem in a fair amount of detail. It doesn't get into the gory details of the "real" N-body solvers, but it does give you an overview of the techniques they use.
XStar by Wayne Schlitt, email@example.com This program "solves" the n-body problem, and displays the results on the screen. It starts by putting a bunch of stars on the screen, and then it lets the inter-body gravitational forces move the stars around. The result is a lot of neat wandering paths, as the stars interact and collide. XStar can be used to animate the root window, as a screen sa more»
XGrav by DWF, firstname.lastname@example.org Version 1.0.1, 1/20/95 This program is a hack of XSwarm 2.3 by Jeff Butterworth. I know nothing about X programming, so I modified a program that was pretty close to what I wanted. Instead of a swarm of bees, this program now shows the gravitational interaction between a number of "stars." The trails are left on purpose since I think it's more interestin more»
XSTAR(6) XSTAR(6) NAME XStar Version 2.2 - X11 animated n-body solver SYNOPSIS xstar [-hrRMv] [-b stars] [-g geometry] [-d host:display] [-t timeout] [-D delay] [-B buf_factor] [-c star_color] [-C bg_color] [-a float] [-m [taylor3|rk4|gpemce8|ab7|am7]] [-l float] [-T num_pts] DESCRIPTION XSta more»
GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Softw more»