Genetic algorithm pressurized cylindrical tube

2018 11 5
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I need to make a 60x6 matrix with these variables, Force, Torque, radius, thickness, Pressure and my cost function. I can't get my cost function to work. ? = (?−2??^2)/(2??^2 )^2. The variables are as follows
?=[(?? − ??)^2+ (?? − ??)^2+ (?? − ??)^2 + 6(???^2 + ???^2 + ???^2)]
??=[((?? − ??)^2+ (?? − ??)^2+ (?? − ??)^2 + 6(???^2 + ???^2 + ???^2))/2]^.5
??=F/A
??=(P*r)/t
???=(T*r)/J
J=(pi*t*r^3)/2
A=2*pi*r*t
So far I redefined it into variables I can use and now have this,
J=(pi*t*r^3)/t;
A=pi*2*r*t;
a=((b-c)^2 +(c-d)^2+6(e^2 +f^2 +g^2))/2)^.5
b=F/A;
c=(P*r)/t;
d=(p*r)/J;
e=(t*r)/J;
f=(t*r)/J;
g=(t*r)/J;
y=((b-c)^2 +(c-d)^2+6(e^2 +f^2 +g^2));
z=((y-2a^2)/(2a^2))^2;
I get an error with this.

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