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i want o calculate the sphere radius as a function of V where V=pi ,but i can not get the right result

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Tasos Apostolopoulos
回答： the cyclist 2022-1-30
function [rad1, rad2] = my_eval_parameters(E_C,V_S)
rad1=sqrt(E_C/pi);
rad2= (3*V_S/4*pi)^(1/3); %nthroot(3*V_S/4*pi,3);

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the cyclist
the cyclist 2022-1-30
Your formula is dividing by 4, then multiplying by pi. You need
rad2= (3*V_S/(4*pi))^(1/3);
(Note the extra set of parentheses, to enforce the order of operations you want.)

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