MATLAB: How to show which variable is being plotted while using hold

controlcontrol systemControl System Toolboxdc motorelectric_motor_controlhold plotMATLABplotplotsplottingSignal Processing Toolboxstate-space

I've modeled a state space system and now want to plot how the state variables change in time.
This is how I've set it up:
hx = phi_t * B
hy = C * phi_t * B
hx1 = [];
hx2 = [];
hx3 = [];
hx4 = [];
hx5 = [];
for i = 0:0.05:10
  hx1 = [hx1 subs(hx(1), t, i)];
  hx2 = [hx2 subs(hx(2), t, i)];
  hx3 = [hx3 subs(hx(3), t, i)];
  hx4 = [hx4 subs(hx(4), t, i)];
  hx5 = [hx5 subs(hx(5), t, i)];
end
hold on
title('Impulse Response: State Vectors')
plot(hx1)
plot(hx2)
plot(hx3)
plot(hx4)
plot(hx5)
hold off
I'd like to know how I can show the names of the variables in the figure this code gives out, so I can know which is which (x1,x2,x3,x4 and x5). How can I do that?

Best Answer

The legend function is the most obvious way to designate them. The text function is also an option. It depends on the result you want.
Example — 
legend('x1','x2','x3','x4','x5')
.
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