how to add another title to a plot with unknown title in matlab

To add another title to a plot in MATLAB, you can use the title function. If the original title is unknown or variable, you can store the original title in a variable and append the new title to it. Here's an example:

main.m
% create some sample data
x = 1:10;
y = rand(1,10);

% plot the data and store the original title
h = plot(x,y);
orig_title = get(gca,'Title').String;

% add a second title 
new_title = 'My New Title';
title([orig_title ' ' new_title]);
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In this example, the get function is used to retrieve the current title string of the plot. This is stored in the variable orig_title. Then, the title function is called again to add the new title, which is appended to the original title with a space in between.

Note that the gca function is used to get the handle to the current axes, which is required for the get function to retrieve the plot title.