How to run a function each certain amount of time during loop?

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iddqd 2017-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/353512-how-to-run-a-function-each-certain-amount-of-time-during-loop

评论： Jan 2017-8-23

I am running some kind of neurology experiment where i need to record cursor location and movements. I am doing this using infinte loop with Getmouse() inside (and also other manipulations on the cursor position) and write the position in log test file.

so far so good, the thing is that i need every few seconds to run a sync function which i already wrote (which send signal to serial port and write this event to the same log file from before).

How can i define event or interrupt in order to stop the loop every few seconds?

I am hoping i made my self clear and thanks.

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Answer 1

José-Luis 2017-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/353512-how-to-run-a-function-each-certain-amount-of-time-during-loop#answer_278699

Looks like you need a timer object inside your function.

https://se.mathworks.com/help/matlab/matlab_prog/use-a-matlab-timer-object.html

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iddqd 2017-8-23

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Hi thanks

tried your idea but having very weird thing.

i can see that the timer has finished but i don't know why it does not get into the if and break command.

any idea? (my goal is to break from the function after 4 seconds of the cursor inside a circle)

firstInside = 0;
timeout=0;
while (1)
  [x, y] = GetMouse(cfg.window);
  Cursor = CenterRectOnPointd(cfg.cursorShape, x, y);
    if (mod(new_counter,20) == 0)
    Screen('FrameOval', cfg.window , [cfg.TARGET_COLOR'  cfg.CURSOR_COLOR'],[Target' Cursor'],4);
    Screen('flip', cfg.window);
    end
    inside = IsInRect(x, y, Target);
    new_counter = new_counter+1;
    if inside
        if ~firstInside
            insideTimer = timer('TimerFcn', 'disp(''timer finished'');timeout=1','StartDelay',3);
            firstInside=1;
            start(insideTimer);
            disp('timer started');
            timeout = 0;
        end
        if timeout==1
            return
        end

Jan 2017-8-23

Do not create the timer callback as a string, because such strings are evaluated in the base workspace, such that the change of timeout is not visible inside the function.

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