How to update rfplots

I'm using the rfplot command from the RF Toolbox create a s-parameter visualization GUI. (App Designer)

"hold on" is used to plot several parameters in one figrue.

On some points, the plots have to be updated. For instance, if the user wants to delete a parameter.

The problem is how to reset these plots?

hold(app.AxesMag, 'on');
rfplot(app.AxesMag,app.s2p1,{[app.n(1),app.n(2)]});
rfplot(app.AxesMag,app.s2p2,{[app.n(1),app.n(2)]});
hold(app.AxesMag, 'off');

This works fine, but if the plots are to be updated, they will be added to the old ones. My question is how to reset the figure? Resetting/Clearing the Axes via "clf" or "cla" does not work.

Answer 1

[Hassaan]

% Clear the axes
cla(app.AxesMag);

% Hold on for multiple plots
hold(app.AxesMag, 'on');

% Plot your s-parameters
rfplot(app.AxesMag, app.s2p1, {[app.n(1), app.n(2)]});
rfplot(app.AxesMag, app.s2p2, {[app.n(1), app.n(2)]});

% Release hold
hold(app.AxesMag, 'off');

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[Adam Danz]

> Resetting/Clearing the Axes via "clf" or "cla" does not work

This answer is not helpful. Your answer just copies the same code from the question and then uses cla which the OP claims isn't working.

@Muhammad Hassaan Shah please review the Generative AI guidelines for MATLAB Central

https://www.mathworks.com/matlabcentral/content/community-guidelines.html

The use of generative AI tools is allowed but you are responsible for ensuring that your content is relevant and accurate.

[Hassaan]

@Adam Danz

Thank you for the valuable feedback and much appreciated for the referred link.

Answer 2

[Adam Danz]

I'm not quite sure how to interpret the problem. Here are two guesses.

> if the plots are to be updated, they will be added to the old ones

If you are trying to add more lines to the existing axes, use hold(app.AxesMag,'on') or remove the hold(app.AxesMag,'off').

If you are trying to update the line objects, add an output to the rfplot function. The output is a handle array of line handles. The line handles contain XData and YData properties that can be updated.

> My question is how to reset the figure? Resetting/Clearing the Axes via "clf" or "cla" does not work.

If the goal is the clear the axes, cla does work and if the goal is to clear the figure, clf does work so I would need more details on what's not working.

[Henning]

It is your second guess.:) The goal is to clear the axes.

If you use cla(app.AxesMag); and then refresh the plot, the data is plotted but the legend is deleted, and this error message appears:

It doesn't matter whether the legend is created automatically or whether I typed in a plot name myself.

There are no problems, when plotting for the first time after resetting the GUI, and does not occur while using the normal plot function.

[Adam Danz]

I couldn't reproduce the problem. What does "refresh the plot" mean, how are you doing that?

Try this,

cla(app.AxesMag,'reset')

[Henning]

Unfortunately your suggestion doesn't work as well.

It may helps if I desicirbe the goal of the app more:

In a first step, the purpose is to visualize s-parameters of up to three touchstone files simultaniously. These are imported and stored in Matlab, and can be selected to be shown by the user via check boxes. A button displays all desired plots via callback. Up to this point, everything works well. The next step would be to be able to change adjustments, e.g. display a different parameter without restarting the app. Because I'm using hold on, the plots are added to the existing ones, but I don't want that. Therefore, I want to reset them. That is also what I ment with refesh the plots. The simpliyfied code is:

function UpdatePlotButtonPushed(app, event) %button callback to update the plot

rfplot(app.AxesMag,app.s2p1,{[app.n(1),app.n(2)]});

function ClearButtonPushed(app, event)

cla(app.AxesMag,'reset');

function UpdatePlotButtonPushed(app, event) %button callback to update the plot

rfplot(app.AxesMag,app.s2p1,{[app.n(1),app.n(2)]});

While second time the rfplot is executed, the mentioned error message appears. I tried every cla, clf, delete combination I found. Implementing static plot names for the legend do not help either.

[Hassaan]

Reference

https://www.mathworks.com/matlabcentral/answers/2073736-how-to-update-rfplots#comment_3042291

> Resetting/Clearing the Axes via "clf" or "cla" does not work

Any answer/solution provided that does not solves OP query is 'Generative AI' I dont know how.

As per OP:

'Unfortunately your suggestion doesn't work as well.'

https://www.mathworks.com/matlabcentral/answers/2073736-how-to-update-rfplots#comment_3042876

This answer is not helpful. Your answer just copies the same code from the question/comments with slight argument change and then uses cla which the OP claims isn't working.

@Adam Danz please review and guide further.

AI Guidelines:

https://www.mathworks.com/matlabcentral/content/community-guidelines.html

I hope other senior members of MATLAB community can shed some light on this. And better define 'Do's and Don't' for 'Generative AI' usage and defination for the MATLAB QnA community. Instead, of marking and assumming every other answer as 'Generative AI'.