Please try this is code:
z = ...
subs(5.3*p(1) + 5.5*p(2) + 5.8*p(3) +...
0.004*p(1)^2 + 0.006*p(2)^2 + 0.009*p(3)^2 + 1100.0,p,sym('p_',[numel(p),1]));
fun = matlabFunction(z,'vars',{symvar(z)});
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