Detecting events - why are 2 events occurring when the calcuations should stop after any event ?

Hi

I am solving a diff equation using ode15s. An event function is used to detect 2 events. This function stops the cal. once an event is detected and re-starts the next round of calculation using the values of the variables when the event is detected as the initial condition.

The event function is given below :

%------------------------

    function [eventvalue, stopthecalc, eventdirection] = eventsFuncn8_IB(t, z, p, nj)

     R = z(1);     % radius of bubble
     Rdot = z(2);  % vel of bubble wall

eventvalue = [Rdot Rdot] ;
stopthecalc = [1 1];          %  CHANGED FOR FLYNN SOLUTION FROM 1 1 to 0 0
eventdirection = [-1 1];  % stop when rdot = 0 when y' is negative OR 
                            rdot = 0 when y' is positive
end
%---------------

My understanding is that only 1 event will occur in a given iteration because the instant the event occurs the calculation is stopped (because stopthecalc = [1 1])

But when I run the main program there are iterations when 2 events are detected. How is this possible ? Because shouldn't the calculation stop the moment an event is detected ?

TIA

[Dhamdhawach Horsuwan]

I face this problem too.

Based on ode45 algorithm I guess when ode45 take a step say t1 to t2 then it found 2 event at same (ode45) step

after that matlab will find exact time for each event and report it individually.

anyway I consider this situation as bug. after find which event occured first, matlab should ignore other event afterward.