function plus timer in background

Question

roberto 2023-2-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1918640-function-plus-timer-in-background

评论： roberto 2023-2-25

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hello everybody

tks to Benjamin and Walter I run a webread function connected with a timer ,

I want to run a separate function, working in background, starting every 60 secs.

I've tried in some ways but didn't succed

this is the command:

 longT=tbl(:,"dose");
LT=trenddecomp(longT);
figure(11);
plot(LT,"dose_LongTerm");
 hold on;
 plot(tbl,"dose");
 hold off;
 figure(10);
plot(LT,"dose_Seasonal")

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roberto 2023-2-25

移动：Walter Roberson 2023-2-25

在 MATLAB Online 中打开

this is my attempt.

Ii put the above command in a script called LTdose, but running the function called "longseas", it gives me the following error:

"longseas

Error while evaluating TimerFcn for timer 'MyTimer'

Unrecognized function or variable 'tbl'."

but if I launch manually the script LTdose (even with run(LTdose) ), it works as usual

please a help, tks.

function [myTimer] = longseas
myTimer = timer('Name','MyTimer',               ...
                'Period',30,                 ... 
                'StartDelay',0,                 ... 
                'TasksToExecute',inf,           ... 
                'ExecutionMode','fixedSpacing', ...
                'TimerFcn',@myTimerCallback); 
start(myTimer);
function myTimerCallback(hObject, eventdata) 
run("LTdose");

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Answer 1

Walter Roberson 2023-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/1918640-function-plus-timer-in-background#answer_1179830

When you run() a script inside of a function, the workspace of the script is the workspace of the function.

When you run() a script at the command line (and you are not stopped at the debugger), the workspace of the script is the base workspace.

The earlier discussion involved writing a timer not shown here, in which you wanted data read in every 60 seconds, and the final version of the code was assigning the data into the base workspace. If that is still what you are doing then in your script you should evalin('base', 'tbl') to retrieve tbl from the base workspace.

I am not clear as to why you want two separate 60 second timers, instead of having the callback for the first timer run the script?

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Walter Roberson 2023-2-25

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function doStuff()
    intervalInS=60;
    everyNowAndThen = timer("Period",intervalInS,"ExecutionMode","fixedRate","TimerFcn",@refresh);
    everyNowAndThen.start();
end
function refresh(~,~)
   tbl = webread('https://api.=CSV');
   assignin('base','tbl',tbl);
   run("LTdose");
end