MATLAB: How to stop ode after 50th event has occurred

event functionode45

I am trying to run ode45 once using an event function, but have it stop after the 50th event has occurred. I am currently using a persistent counter to keep track of events, but am missing the logic to update the counter. Below is the code for my event function. I do not want to call ode45 50 times by updating the initial conditions with the terminal conditions from the previous call.
function [value,isterminal,direction] = y0eventPoincare(t,y)
persistent icount
if (isempty(icount))
    icount=0;
end
if icount<50
value=y(2);
isterminal=0;
direction=1;
if (**Missing Logic**) %Event has occured
icount=icount+1;
end
end
if icount==50
value=y(2);  
    if true
      % code
    end  
  isterminal=1;
  direction=1;
  end
end

Best Answer

Not each call to y0eventPoincare means that a new event has occured. Thus it is not possible to keep track of the number of events within the event function.
I don't see another way to count the number of events in the routine calling the ODE solver (thus to go the way you wanted to avoid).
Best wishes
Torsten.
Related Question