In App Designer I'm having trouble assigning a function handle to TimerFcn.

I'm kind of a newby with App Designer and having trouble assigning a function handle to TimerFcn.

I know the Timer is set up properly because the line:

app.myTimer.TimerFcn = @(~,~)disp('do something'); works fine.

But when I use:

app.myTimer.TimerFcn = @Timer_func; I get "Undefined function 'Timer_func' for input arguments of type 'timer' ".

But the function is in fact defined:

methods (Access = private)

function Timer_func(app)

if app.tval == "Green"

app.tval = 'Red';

elseif app.tval == "Red"

app.tval = 'Green';

end

app.TimerLamp.Value = app.tval;

end

end

Answer 1

[Greg]

You missed the second half of the error message: "Undefined function 'Timer_func' for input arguments of type 'timer'." Apps in AppDesigner are classdefs, meaning the app is a class. When you define a method inside the .MLAPP file, you've defined it for "input arguments of type [your app]," which means variables like timers can't see that function. Move Timer_func out of the .MLAPP into its own .M or .MLX file on your MATLAB path.

Or, since you appear to need app itself inside the timer callback, use

@(~,~) Timer_func(app)

[Steve Boose]

Thank you Greg!

[Greg]

Happy to help.