How to declare a global variable in Startup function of matlab app.designer

I want to declare a global variable in matlab app designer's startup function in order to use it continuously through the app's code.

Specifically, I want to declare value1 as a global variable

I have tried that but it doesn't seems that works.

Thank you very much

Answer 1

[Adam Danz]

Do not use global variables, especially in AppDesigner.

Instead, declare a public or private property accessible anywhere within the app or outside of the app (for public properties).

Step-by-step guide

Share Data Within App Designer Apps

Creating Multiwindow Apps in App Designer

[ErikJon Pérez Mardaras]

Thanks for your reply, however it doesn't seems that works. I don't know what am I doing wrong.

I just want to declare a global variable (or better, after reading your answer, a public value) to use it along the program. I want value1 to be that variable and set its value to 7, so when I click the button, the value appears on the editfield.

Here is set as a public value

Here is the callback of the button to work when it is pussed.

When I run the app and click the button..nothing happnes, just pops out that error.

Thanks for your help.

[Walter Roberson]

app.editnum.Value = app.value1;

[Adam Danz]

If the "global variable" is needed within the app, it should be declared as a private variable, accessible by app.____.

If the "global variable" is needed by another app or function outside of the app, then it should be a public variable, accessible using the same method above after retrieving the app handle.

[ErikJon Pérez Mardaras]

It doesn't let me put that. Appears me in red as an error

[ErikJon Pérez Mardaras]

Thanks for your reply also Adam Danz.

But I have tried exactly the same both codes that I have putted here in private property and the same happens

[Adam Danz]

You're not declaring the property correctly. Check out the "step-by-step guide" link in my answer. It shows you pictures of each step.

[ErikJon Pérez Mardaras]

Thanks for your reply!

What I was doing wrong was that I was putting in the button callback:

app.editnum.Value=value1;  %INCORRECT

Instead of

app.editnum.Value=app.value1;  %CORRECT

Thanks!