Plot with varying legend in for loop

I need to do a for loop from -1 to 1 with increments of 0.1 where 0 is neglected. In this plot i create a transfer funciton and i plot the bode plot of if.

I would like to show a legend of a plot containing all the bode plots, with each system being names something like Gp(u1 = value of for loop).

My code looks something like this:

s = tf('s');
for u1 = -1:0.1:1
    if u1 == 0
        continue
    end
    
    Gp1 = tf([rand 1], [rand 1]);
    txt = ['Gp, u1 = ',num2str(u1)];
    bode(Gp1,'DisplayName',txt)
    
    hold on
end
legend show

This works on a regular plot, but the bode() function does not accomodate the 'DisplayName' function.

How should i do this? I have tried saving the values in an array, but with no luck, as the index need to be positive and an integer.

Answer 1

[Peng Li]

An easier work around i think is that you store txt during each loop in a string array, or a cell array, and plot legend afterwards.

try

s = tf('s');

ld = [];

for u1 = -1:0.1:1
    if u1 == 0
        continue
    end
    
    Gp1 = tf([rand 1], [rand 1]);
    txt = "Gp, u1 = " + num2str(u1);
    bode(Gp1)
    
    ld = [ld; txt];
    
    hold on
end
legend(ld)

[Mads Bilde]

Thanks a lot! It works perfectly!