How to stop an iteration inside a for loop when its execution exceeds some period of time

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Khalil Messaoudi 2022-5-31

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评论： Khalil Messaoudi 2022-6-1

采纳的回答： Walter Roberson

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Hello,

I have the following problem. I'm iterativing in a for loop. Sometimes an iteration takes a lot of time, therefore I want to skip it and move to the next iteration. I tried with tic toc but it does not seem to work.

Here is the code :

for i=1:9
       [alpha_w2u,C_w2u,m_w2u] = FL_WSGP1(xu,yu,d,eps1,sigma,K,c,b,0.5 *10^(i-5)) ;
       pFeLi.f = @(xk) pred1(alpha_w2u,C_w2u,m_w2u,xk,K,0) ;
       ctrl = @(t,xu) ctrlFeLi(t,xu,pFeLi,reffun);
       
       tic
       while (toc<2)
          [t4u,x4u] = ode45 (@(t4u,x4u) dynAffine(t4u,x4u,ctrl,pdyn),[0 50],xin);
       end
       x4uop(i) = x4u(end) ;
       
end      

How can I stop the execution of :

[t4u,x4u] = = ode45 (@(t4u,x4u) dynAffine(t4u,x4u,ctrl,pdyn),[0 50],xin);

if it takes more than 2 seconds and then move to the next iteration.

Thanks in advance

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Walter Roberson 2022-5-31

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use an ode event function

@(t,y)my_event(t,y,tic)

have the function test whether toc() of the input tic exceeds the limit and if so signal termination

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Torsten 2022-5-31

编辑：Torsten 2022-5-31

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Take inittime as

inittime = tic

before you call ode45.

Pass "inittime" to "interrupt". Taking "toc(inittime)" therein gives you the elapsed time since you called ode45.

So ode45 will stop if the elapsed time since you called it is > 2 seconds.

Or do I miss something ?

Khalil Messaoudi 2022-6-1

@Torsten now it seems to work thnak you !

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Image Analyst 2022-5-31

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编辑：Image Analyst 2022-5-31

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I don't think you can programmatically stop a canned function once it's been called. But for other situations...

Try this:

for k = 1 : 100000
    startTime = tic; % Time at start of this iteration.
    % some code that takes time...then, whenever you want to check on the time:
    elapsedSeconds = toc(startTime);
    if elapsedSeconds > 2
        continue;
    end
end