MATLAB: Line doesnt appear on the graph

graphicsMATLAB

t=0; 
for i=10:-1:4 ;
        z=i-1;
        A0=pi*(i/2)^2;
        Ai=pi*(z/2)^2;
        phi=log(A0/Ai);
        t=t+phi;
        if i>=4
            mu=0.05;
        elseif i<4
            mu=0.02;
        end
         F=A0*t*mu*80;
         hold on
         plot(i,F,'--ro')
         title('force-stage number graph')
         xlabel('Passes(mm)')
         ylabel('Force[N]')
         hold off
end

Best Answer

Try this:
t=0;
index = 1;
for i=10:-1:4
  z=i-1;
  A0=pi*(i/2)^2;
  Ai=pi*(z/2)^2;
  phi=log(A0/Ai);
  t=t+phi;
  if i>=4
    mu=0.05;
  elseif i<4
    mu=0.02;
  end
  F(index) = A0*t*mu*80;
  index = index + 1;
end
x = 10:-1:4;
hold on
plot(x, F, '--ro', 'LineWidth', 2)
grid on;
fontSize = 20;
title('Force-stage number graph', 'FontSize', fontSize)
xlabel('Passes [mm]', 'FontSize', fontSize)
ylabel('Force [N]', 'FontSize', fontSize)
hold off
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