R. Miranda & E. Stone, The proto-Lorenz system, Physics Letters A 178 (1993) 105-113.
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W=540;N=W*37
x,y,z,t=.1,0,0,.01
a,b,c=10,28,8/3
def F():
global x,y,z
u=a*(y-x);m=x*(b-z)-y;l=x*y-c*z
x+=u*t;y+=m*t;z+=l*t
vertex(x*9+W/2,-z*9+W-20)
size(540,540,P3D)
clear();ortho();noFill()
stroke(255,100)
beginShape()
[F()for i in' '*N]
endShape()
#つぶやきProcessingpic.twitter.com/nc08pLUjiM
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h=lambda x,y:sqrt(x*x+y*y) def F():global x,y,z;u=((-a+1)*x+(a-b+z)*y)/3+((1-a)*(x*x-y*y)+2*(b+a-z)*x*y)/(3*h(x,y));m=((b-a-z)*x-(a+1)*y)/3+(2*(a-1)*x*y+(b+a-z)*(x*x-y*y))/(3*h(x,y));l=(3*x*x*y-y*y*y)/2-c*z;x+=u*t;y+=m*t;z+=l*t;vertex(x*30+W/2,y*30+W/2+40) https://twitter.com/yuruyurau/status/1233049659733499904 …pic.twitter.com/AegTEIc3q3
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def F(): global x,y,z u=(-a*x*x*x+(2*a+b-z)*x*x*y+(a-2)*x*y*y+(z-b)*y*y*y)/(2*(x*x+y*y)) m=((b-z)*x*x*x+(a-2)*x*x*y+(-2*a-b+z)*x*y*y-a*y*y*y)/(2*(x*x+y*y)) l=2*x*x*x*y-2*x*y*y*y-c*z x+=u*t;y+=m*t;z+=l*t vertex(x*50+W/2,y*50+W/2) https://twitter.com/yuruyurau/status/1233049659733499904 …pic.twitter.com/Y0sSK36FtN
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Lorenz
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