Plot two data sets and only clear one of them ?

Hello,

I have a code that plots two data sets on the same plot coming from two different text files using uigetfile(). To do so, I use the function plot twice (because this happens in two separate functions within my app designer).

My problem is that when I load a new text file, I am only able to clear the whole plot or to add the new data set to the existing previous two data sets, instead of just replacing one of them.

I have tried to use hold or linkdata but it doesn't work the way I intend it.

Any help would be much appreciated:)

Gwendal

Answer 1

[Voss]

You can store the handle(s) to the plotted objects somewhere in your app structure, and delete them and replace them with new plotted objects as needed.

% store the first plotted line as line_1
line_1 = plot(1:10);
hold on
% store the second plotted line as line_2
line_2 = plot(2:11);

% delete line_2
delete(line_2);
% make another line_2 with different data
line_2 = plot(3:12);

line_1 and line_2 here would be stored in your app structure, and they might be created and deleted in different functions within your application.

Answer 2

[Adam Danz]

Option 1: Delete a data set and add a new data set.

Example:

hold(ax, 'on')

h1 = plot(__);

h2 = plot(__);

% replace h1

delete(h1)

h1 = plot(__);

Option 2: Replace the values of one dataset with the values of the second dataset.

Example:

hold(ax, 'on')

h1 = plot(__);

h2 = plot(__);

% replace h1 data

set(h1, 'XData', x, 'YData', y,)

[Gwendal Marrec]

Thank you @Adam Danz and @_, both of your answers helped me to understand where my problem was.