Deformed plots and extra windows plotting in matlab app.designer

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I am the same person of the previous question. So I am trying to design an app which, when I click on the button, a circle is drawn in the pannel. This is the code I have written to let this happen:
And this is the result:
As you can see, the circunference is deformed. So, to avoid that, to have the pannel gridded and to hold on the graph for future simultaneous plots, I add axis equal, grid and hold on in the code (as I would do the same for the matlab command window) as you can see below:
When I run the app and click the button, appears the same deformed circle and an extra window (figure 1 ) with nothing on it as you can see:
How can I get rid of that annoying extra window (Figure 1) and how can I achieve axis equal, hold on and grid commands to be executed?
Thank you very much!

Accepted Answer

Adam Danz
Adam Danz on 17 Jan 2021
ErikJon Pérez Mardaras
ErikJon Pérez Mardaras on 17 Jan 2021
I made this:
and this is the result:
It works perfectly. Thanks for your help! However, as long as I can see, the X and Y limits specification is not necessary. The difference that I can tell is that with X and Y limits, the plot is on scale, whthout them, the drawing just occupies all the window
Adam Danz
Adam Danz on 17 Jan 2021
That's correct, they are not related to the data aspect ratio controlled by axis equal.

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