MATLAB: How to fix graph with for loop

graphsloops

I am trying to plot a graph to show me the operating curve of \tau with Y_B for different values of T. This is the code below:
t = 1:2:20;
  T = 600:10:850;
  for i=1:numel(T)
    k1(i) = 1e7 .* exp(-12700 ./ T(i));
    k2(i) = 5e4 .* exp(-10800 ./ T(i));
    k3(i) = 7e7 .* exp(-15000 ./ T(i));
    Y_B = (k1(i).*t.*(k1(i)+k3(i)))./(((k2(i).*t)+1).*(k1(i)+k3(i)).*(1+(t.*(k1(i)+k3(i)))));
    plot(t, Y_B);
    xlabel('Residence time, \tau / s') 
    ylabel('Yield of Maleic Anhydride ')
  end
The graph produced is incorrect as it only has one operating curve. What is wrong with my code?

Best Answer

Use hold on command:
 t = 1:2:20;
    T = 600:10:850;hold on;
    for i=1:numel(T)
      k1(i) = 1e7 .* exp(-12700 ./ T(i));
      k2(i) = 5e4 .* exp(-10800 ./ T(i));
      k3(i) = 7e7 .* exp(-15000 ./ T(i));
      Y_B = (k1(i).*t.*(k1(i)+k3(i)))./(((k2(i).*t)+1).*(k1(i)+k3(i)).*(1+(t.*(k1(i)+k3(i)))));
      plot(t, Y_B);
      xlabel('Residence time, \tau / s') 
      ylabel('Yield of Maleic Anhydride ')
    end
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