# This example displays a beautiful strange attractor: the Lorenz # attractor. # You may run this example by doing: # # ode < lorenz.ode | graph -T X -C # # or alternatively, to get a real-time plot, # # ode < lorenz.ode | graph -T X -C -x -10 10 -y -10 10 # # You may also produce and print a Postscript version by doing # # ode < lorenz.ode | graph -T ps -C -x -10 10 -y -10 10 -W 0 | lpr # # The `-W 0' sets the line width for the Postscript plot to # be zero. That means that the thinnest line possible will be used. # The Lorenz model, a third order system. # Interesting cases are r = 26, 2.5<t<30, x = z = 0, y = 1 # and r = 17, 1<t<50, x = z = 0, y = 1. x' = -3*(x-y) y' = -x*z+r*x-y z' = x*y-z r = 26 x = 0 y = 1 z = 0 print x, y step 0, 200
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