Variable R is a row vector of 4 elements. But you defined indices up to 5. That's why you are getting an error.
V=zeros(4,5);
R=[16.4e-9 17.2e-9 28.2e-9 100e-9];%resistivity of material (silver, copper, aluminium, and iron)
A=[1.31e-6 517.63e-9 204.73e-9 80.98e-9 32.03e-9];%AWG Area of 16, 20, 24, 28, and 32. in m^2
for i=1:4
for j=1:5
V(i,j)=0.1*(R(i)*1000/A(j));%calculation of volatage in Volts(V)
%Given: I=0.1A, Length= 10Km = 10000m
end
end
sol=V<100; %Check the volatge is less than 100V
Com=[];
%for loop in order to output a matrix with the coordinates where voltage is less than 100V.
for row=1:4
for col=1:5
if sol(row,col)==1
Com=[Com;row,col];
end
end
end
[r,c]=size(Com);
fprintf("The following combination with volatage loss of less than 100V is:\n")
%for loop to output material name and AWG# base on the coordinates system.
for m=1:1:r
m_id=Com(m,1);
a_id=Com(m,2);
if m_id==1
fprintf('Silver and ');
elseif m_id==2
fprintf('Copper and ');
elseif m_id==3
fprintf('Aluminium and ');
else
fprintf('Iron and ');
end
if a_id==1
fprintf('AWG 16\n')
elseif a_id==2
fprintf('AWG 20\n')
elseif a_id==3
fprintf('AWG 24\n')
elseif a_id==4
fprintf('AWG 28\n')
else
fprintf('AWG 32\n')
end
end
