Control systems: Labelling multiple plots dynamically based on parameter ?

Hello! This is my first time using this forum. Basically I need some way to label the plots with the value of the variable 'zeta' so that my output (below)

resembles this diagram (below) in my text book (the numbers "1.5", "1.0", "0.8", etc):

The code I have used is:

s = tf('s');
Wn = 1;
for zeta = 0.1:0.1:0.9
    T = Wn^2/(s^2 + 2*zeta*Wn*s + Wn^2);
    step(T);
    hold all
end

Answer 1

[Burhan Burak AKMAN]

You can use this. May be it will help you.

s = tf('s');
Wn = 1;
i=1;
ti=linspace(0,20,200);
for zeta = 0.1:0.1:0.9
    T = Wn^2/(s^2 + 2*zeta*Wn*s + Wn^2);
    [a,b]=step(T,ti);
   
    hold all
    
    plot(b,a)
    text(b(-i*2+40),a(-i*2+40),"\zeta="+string(zeta),'FontSize',10)
    i=i+1;
end

Answer 2

[Paul]

Here's a way to do it with a legend.

s = tf('s');
Wn = 1;
for zeta = 0.1:0.1:0.9
    T = Wn^2/(s^2 + 2*zeta*Wn*s + Wn^2);
    [y,t]=step(T);
    plot(t,y,'DisplayName',"zeta = "+string(zeta))
    hold all
end
legend

If you really want to annotate the curves themselves, check out

doc text
doc annotation

[Shovnik Paul]

This was very helpful, and honestly more readable, but I chose the other answer because it was closer to the diagram in my book. Thanks a lot!