[PTB] how to cancel running a function with a timer?

Question

lou 2015-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/257628-ptb-how-to-cancel-running-a-function-with-a-timer

编辑： Walter Roberson 2015-11-26

Hi,

I am trying to make a loop in MatLab Psychtoolbox that runs the GetClicks function for 2 seconds and then stops running it. But mu current function gets stuck in the GetClicks function. By getting stuck I mean that it won't leave the loop before a subject has clicked on the screen, but I would like to have the option to leave the loop also when subject has not clicked with a mouse. I also need o save the coordinates of the mouse click (these determine what answer the subject gave).

Any ideas how to solve it?

 tic;
      state=0;
      while state==0;
          time=toc;
          if time < 2 %subject should have 2seconds to reply
              [clicks,x,y] = GetClicks;
              if clicks==1
                  state=1;
              end
          elseif time> 2
              state=1;
              clicks=99;
          end
      end

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Answer 1

Walter Roberson 2015-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/257628-ptb-how-to-cancel-running-a-function-with-a-timer#answer_201244

编辑：Walter Roberson 2015-11-26

在 MATLAB Online 中打开

Since you are working with PsychToolbox routines, you should really be checking with their mailing list or online resources.

It looks to me as if the answer might be

http://docs.psychtoolbox.org/GetClicks

global ptb_mouseclick_timeout;
old_timeout = ptb_mouseclick_timeout;
ptb_mouseclick_timeout = 2;
clicks = GetClicks([],0);
ptb_mouseclick_timeout = old_timeout;
state = clicks > 0;