Timer Interrupt in App Designer

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Hossam Alzomor
Hossam Alzomor on 21 Oct 2019
Commented: Guillaume on 21 Oct 2019
Hi,
I am trying to implement a timer interrupt in app designer,
I did the following
  • define t in properties
  • init timer in startupFcn
app.t=timer;
app.t.TimerFcn = @DisplayFPS;
app.t.Period =1;
app.t.ExecutionMode = 'fixedRate';
  • implement timer callback function inside private methods
function DisplayFPS(app,mTimer,~)
framerate= app.framescount/app.framestime;
message = sprintf("Frame rate = %f f/s",framerate);
app.ResultTextArea.Value = [message;app.ResultTextArea.Value];
app.framescount = 0;
app.framestime = 0;
end
but I get the following error when I start
Error while evaluating TimerFcn for timer 'timer-2'
Undefined function 'DisplayFPS' for input arguments of type 'timer'.
How could I overcome this problem?

Accepted Answer

Guillaume
Guillaume on 21 Oct 2019
app.t.TimerFcn = @app.DisplayFPS; %<--DisplayFPS is a method of the app, so must be called with app argument
  2 Comments
Hossam Alzomor
Hossam Alzomor on 21 Oct 2019
Thanks for reply
after doing modification I get another error
Error while evaluating TimerFcn for timer 'timer-1'
Matrix dimensions must agree.
Guillaume
Guillaume on 21 Oct 2019
So, it's calling your callback now, but there's a bug in your callback.
Possibly app.framescount or app.framestime is not scalar.
We'd need to see the full error message to be sure. In any case, that's nothing to do with your original question.

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