Add a textbox in a subplots inside a loop

I want to create a text box for each subplot that are created inside a loop for. But all the text is created in the fist plot and i don't know how to make it for the second one, also i cannot change the titles of any of the plots.

this is my code so far:

clc
clear
z =  [0.44,4.7, 7, 8, 17.9, 31, 57];
dim = [.2 .5 .3 .3];
c ={'0.44','4.7', '7', '8','17.9', '31', '57'};
txt = texlabel('H(s) = (5/z*(s+z))/(s^2+37s+232)');
txt2 = texlabel('H(s) = (5*(s+z))/(s^2+37s+232)');
ax1 = subplot(2,1,1);
 ax2 = subplot(2,1,2);

for i=1:length(z)
    zc=z(i);
    
    %graph1
    num=(5)*[1 zc]; % [] valor de los coeficientes del numerador de H(S)
    dem =[1 37 232]; 
    h=tf(num, dem);
    
    step(ax1, h)
    hold(ax1, 'on')
    text(0.8,1,txt,'FontSize',10,'fontname','times') 
    grid  on
    
    %graph2
    num2=(5)/(zc)*[1 zc]; % [] valor de los coeficientes del numerador de H(S)
    h2=tf(num2, dem);
   
    step(ax2, h2)
    hold(ax2, 'on');
    annotation('textbox',dim,'String',txt2,'FontSize',10,'fontname','times','FitBoxToText','on');
    grid on
end

legend(ax1, c);
legend(ax2, c);

and thats what i'm getting out of it:

Answer 1

[Jan]

Move the repeated code out of the loop to simplify the code:

z    = [0.44, 4.7, 7, 8, 17.9, 31, 57];
dim  = [.2 .5 .3 .3];
c    = sprintfc('%g', z);  % UNDOCUMENTED
txt  = texlabel('H(s) = (5/z*(s+z))/(s^2+37s+232)');
txt2 = texlabel('H(s) = (5*(s+z))/(s^2+37s+232)');

ax1 = subplot(2,1,1, ...
    'NextPlot', 'add', ...   % Same as: hold on
    'Grid',     'on');
text(ax1, 0.8, 1, txt, 'FontSize', 10, 'fontname', 'times'); 

ax2 = subplot(2,1,2 ...
    'NextPlot', 'add', ...   % Same as: hold on
    'Grid',     'on');
annotation('textbox', dim, 'String', txt2, 'FontSize', 10, ...
    'fontname', 'times', 'FitBoxToText', 'on');

dem = [1 37 232]; 
    
for i = 1:length(z)
    zc = z(i);
    
    %graph1
    num = 5 * [1 zc]; % [] valor de los coeficientes del numerador de H(S)
    h   = tf(num, dem);    
    step(ax1, h)
    
    %graph2
    num2 = 5 / zc * [1 zc]; % [] valor de los coeficientes del numerador de H(S)
    h2   = tf(num2, dem);
    step(ax2, h2)
end

legend(ax1, c);
legend(ax2, c);

Which text should appear where?

Note that text() creates a text in an axes object (created by subplot() here), but annotation writes to a figure.

[valentina mejia gallon]

Hello Jan,

Thanks for the help.

I want for the first subplot to have the text txt, and the second plot with the txt2. Iwanted to try the different styles for the annotations and text(). However it seems that it still doesn't work.

[Jan]

What does "still doesn't work" mean? The first message is printed at [0.8, 1] in coordinates of the axes. The 2nd message is shown at [0.2, 0.5] in coordinates of the figure.

[valentina mejia gallon]

Hi Jan,

what I want is that each graphic has a text message.

the first graph must have this text = 'H(s) = (5/z*(s+z))/(s^2+37s+232)'

and the second plot this text ='H(s) = (5*(s+z))/(s^2+37s+232)'

my problem is that the both texts are showing in the first graph.

With the code that you showed me I try to run it but as you can see in the image, it gave me an error. (slide the image to the right to see the error that I got)

Thanks for your help