0<x<10 , x(step)=0.1
0<k<1 , k(step)=1
Fx(x,k)=x
Fy(x,k)=y*k
Fz(x,k)=0
y=[(x<2)*(-1)] +
[(2<=x)*(x<6)*( 2-x/2)] +
[(6<=x)*(x<8)*(0.5*x^2-6*x+18)] +
[(x>8)*1]
-8<x<8 , x(step)=0.1
y=3+ 4*x - x^2
-8<x<8 , x(step)=0.5
Fy(x,k)=y * k
y=0.05*x^3 - x + 5
0<L<1 , L(step)=1
Fx(x,k,L)=x+0.5*L
Fy(x,k,L)=y * k
Fz(x,k,L)=0
-8<x<8 , x(step)=0.4
0<a<2*pi , a(step)=pi/10
Fx(x,a)=x
Fy(x,a)=R*sin(a)
Fz(x,a)=R*cos(a)
R=0.05*x^3 - x + 5
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