dx =- y - z          (a =0.2, b = 0.2, c = 4.5)
  	dy = x + a*y	
	dz = b - c * z + x * z

     dX = p*X-q*Z*Y-r*Y                 (p =-50,   q =10,   r=20)
     dY = Z 
     dZ = X

     dX = sin(Y)*X-1.8*Y+sqrt(X^2+1)+exp(-Y)      
     dY = X  

     xx=floor(rnorm(1300, mean=50, sd=50))
     yy=floor(rnorm(1300, mean=50, sd=50))
     zz=floor(rnorm(1300, mean=50, sd=50))

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