Can i get the remaining time from the start of a timer?

Question

giacomo bruno 2016-4-22

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回答： Swaraj 2023-2-9

Hi everyone, I was wondering if it was possible to get the amount of time that remains before a timer executes its TimerFcn? I have a very simple timer such as:

t = timer;
t.StartDelay = 300;
t.TimerFcn = @(myTimerObj, thisEvent)disp('300 seconds have elapsed');
start(t)

How can I know how many more seconds I have before the text appears? Thank you in advance

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Adam Danz 2019-9-14

在 MATLAB Online 中打开

You can approximate time remaining by using tic/toc.

t = timer;
t.StartDelay = 300;
t.TimerFcn = @(myTimerObj, thisEvent)disp('300 seconds have elapsed');
t0 = tic(); 
start(t)
% to check time remaining
remainingTime = t.StartDelay-toc(t0); 

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Answer 1

Swaraj 2023-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/280324-can-i-get-the-remaining-time-from-the-start-of-a-timer#answer_1167465

在 MATLAB Online 中打开

You can use tic, toc and a while loop for this.

t = timer;
t.StartDelay = 20;
t.TimerFcn = @(myTimerObj, thisEvent)disp('20 seconds have elapsed');
sTime = tic;
start(t)
while (toc(sTime) < t.StartDelay)
    fprintf('%.0f seconds remaining\n', t.StartDelay - toc(sTime));
    pause(1);
end