ode45 - Makers of MATLAB and Simulink - MATLAB & Simulink
[t,y,te,ye,ie] = ode45(odefun,tspan,y0,options) additionally finds where functions of (t,y), called event functions, are zero. In the output, te is the time of the event, ye is the solution at the time of the event, and ie is the index of the triggered event. For each event function, specify whether the integration is to terminate at a zero and whether the direction of the zero crossing matters.
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