Timer callback example not working

Question

Scott 2023-8-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2014181-timer-callback-example-not-working

评论： Scott 2023-8-30

I would like to create a timer with a callback, so I tried the example code from the "Schedule Command Execution Using Timer" documentation page. When I copy+paste the example into a live script and run it, the callback never executes.

2 个评论
显示无隐藏无

Scott 2023-8-29

移动：Voss 2023-8-29

Update: I found that the callback does execute, but the text displayed by the callback ends up in the Command Window and not the output panel of the Live Script. The text displayed before the callback shows up in the output panel.

Scott 2023-8-29

移动：Voss 2023-8-29

This did not fully answer the problem. Why does the display text of the callback show up in the command window instead of the output pane? The display text from the other part of the code shows in the output pane as expected.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

YASSINE 2023-8-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2014181-timer-callback-example-not-working#answer_1296496

编辑：YASSINE 2023-8-30

在 MATLAB Online 中打开

Hi, the text is not showing because the timer object callback function is not attached to the live script. You can use "eval(t.TimerFcn)" as a workaround to display text in the live script command window.

t = timer('TimerFcn', 'stat=false; disp(''Timer!'')',... 
                 'StartDelay',10);
start(t)
stat=true;
while(stat==true)
  disp('.')
  pause(1)
end
eval(t.TimerFcn)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Scott 2023-8-30

Thanks Yassine. So this code essentially runs the callback a second time after the while loop, to display the text in the output pane, while the actual callback has run in the background. That's an ok workaround if all that matters is what shows up in the output pane, but I don't think it's generally very practical. Is there no way to attach the callback to the live script so that it works as expected?

请先登录，再进行评论。