How to pass a varying workspace variable to a function calles in a timer object?

Question

maria perez 2014-5-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/129620-how-to-pass-a-varying-workspace-variable-to-a-function-calles-in-a-timer-object

回答： Walter Roberson 2014-5-14

Hello, I have a callback function that I would like to execute every 10 seconds. What I wish to do is pass it a varying variable from the workspace that can be changed through a GUI. Is this possible?

      global iNumberOfPeople
     iNumberOfPeople = 0;
     simple_GUI
     Timer = timer;
     Timer.UserData          = iNumberOfPeople;
     Timer.StartFcn          = @OnStart;
     Timer.StopFcn           = @OnExit;
     Timer.Period            = 10;
     Timer.TimerFcn          = @UploadTxt;
     Timer.TasksToExecute    = 5;
     Timer.ExecutionMode     = 'fixedRate';
     % 
     start(Timer);
    function UploadTxt(mTimer, ~ )
    fCurrentJulianDate = Time.GetCurrentJulianDate;
    iNumberOfPeople     = mTimer.UserData;
    fileID = fopen('NumberOfPeopleMasterThesisRoom.txt', 'a+');
    fprintf(fileID,'%12s \t\t\t\t %3.2f\n',fCurrentJulianDate, iNumberOfPeople);
    fclose(fileID);