MATLAB: “Index exceeds the number of array elements”

function files

Hello,
I am recieving this error:
Index exceeds the number of array elements (1).
Error in sym/subsref (line 890)
            R_tilde = builtin('subsref',L_tilde,Idx);
Error in E_field (line 7)
Ey = matlabFunction(E(2));
Here is the function file the error is referencing:
function [Ex, Ey, Ez] = E_field()
syms x y z
R_s = 0.02;
V = 0;
epnaut = 8.854187E-12;
k = 1/(4*pi*epnaut);
Q = (V*R_s)/k;
r = [x, y, z];
E = (k*Q/norm(r)^3)*r;
Ex = matlabFunction(E(1));
Ey = matlabFunction(E(2));
Ez = matlabFunction(E(3));
end

Best Answer

Perhaps this is what you are looking for,
function [Ex, Ey, Ez] = E_field(x,y,z)
    R_s = 0.02;
    V = 0;
    epnaut = 8.854187E-12;
    k = 1/(4*pi*epnaut);
    Q = (V*R_s)/k;
    
    r = [x, y, z];
    E = (k*Q/norm(r)^3)*r;
    Ex = E(1);
    Ey = E(2);
    Ez = E(3);
    
end
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