Adding and display in AppDesigner GUI

I have a small code below to adding and display the value when users press the button. But there is something wrong here, can anyone help me, please

function Button_57Pushed(app, event)
x2=0;
x2=x2 + 1;
app.Label_2.Text='x2 value, x2';
end

Also, the error message said that x2 might be unused.

Answer 1

[Kevin Holly]

How do you want the text to be displayed?

If you want it to display 'x2 value, 1', you can do the following:

function Button_57Pushed(app, event)
x2=0;
x2=x2 + 1;
app.Label_2.Text=['x2 value, ' num2str(x2)];
end

Not this will always make x2 = 1, since x2 is defined as 0 at the beginning of function. I would remove x2=0 from the function. If you need to preallocate the variable and this is a counter, you need to define it outside the function. You do this in properties (Access = Public). Then you can access the variable with app.x2.

properties (Access = public)
        x2 = 0
end    

function Button_57Pushed(app, event)
app.x2=x2 + 1;
app.Label_2.Text=['x2 value, ' num2str(app.x2)];
end

[Mai Thành]

Thank you very much !!!