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

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);                       

Answer 1

[the cyclist]

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.)