Matlab subscript indices error

Question

help me please. i always get a subscript indices must either be real positive integers or logical error whenever i put 0 value on my "data" how can i get rid of it, i need to have a zero on that one. whenever there is a zero Voltage(1,0) = 1. but I can't get through.

Voltage = [0 1 1 3 4 1; 1 0 5 4 5 3; 6 4 0 4 5 7; 9 3 4 0 6 4; 7 8 5 6 0 7; 4 5 6 7 3 0];
data =[0 2 3 4; 5 6 7 8; 2 3 4 5; 4 5 6 7; 3 4 5 6; 1 3 5 7; 1 2 3 4; 3 4 5 6];
Vm = data(:,1);
Vn = data(:,2);
R = data(:,3);``
X1 = data(:,4);
sz=max(Vn)
y=1:sz
for Vm=data(:,1)
    if Vm==0
       Voltage(y,Vm)=1
       Voltage(y,Vm)=logical(Voltage(y,Vm));
       Current = Voltage(y,Vm)-Voltage(y,Vn);
    else Vm >= 1
       Current = Voltage(y,Vm)-Voltage(y,Vn);
    end
end

Answer 1

You are trying to reference a value in the else statement in the Voltage matrix using y but y is not an integer it is an array (or 1d matrix). If you display y you will see that it is 1 2 3 4 5 6. There are several sections of offending code, one of which is:

else Vm >= 1
    disp(y) # `y` is not an integer and therefore not a valid index.
    Current = Voltage(y,Vm)-Voltage(y,Vn);

To fix it, decide if y should be static or change in the loop.

Let me know if you want a further explanation.