stop Ode45 when y is less than a value

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Lazaros Christoforidis
Lazaros Christoforidis el 28 de Mzo. de 2020
Comentada: Lazaros Christoforidis el 28 de Mzo. de 2020
%So thats my ode call and I want it to stop (and save datas % obviously before t=13s) when the value u(1)<=minu
%Where minu is calcuated before.
u0=[vf1m(jj) 0]';
tspan=[0 13]';
Opt = odeset('Events', @myEvent);
[t,u]= ode45(@(t,u) ok(t,u,p2,m,maxu,maxT), tspan, u0,Opt);
%I tried something like that, nothing worked.
function [value, isterminal, direction] = myEvent(t, u, minu)
value = u(1)<=minu
isterminal = 1; % Stop the integration
direction = 0;
%Eroor Message
Not enough input arguments.
Error in myEvent (line 2)
value = u(1)<=minu
Error in odeevents (line 28)
eventValue = feval(eventFcn,t0,y0,eventArgs{:});
Error in ode45 (line 148)
odeevents(FcnHandlesUsed,odeFcn,t0,y0,options,varargin);
Error in skr (line 217)
[t,u]= ode45(@(t,u) ok(t,u,p2,m,maxu,maxT), tspan, u0,Opt);
  1 comentario
Lazaros Christoforidis
Lazaros Christoforidis el 28 de Mzo. de 2020
Note: jj have values so sometimes finishes @13s, other times crashes before

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Respuesta aceptada

Torsten
Torsten el 28 de Mzo. de 2020
As defined, ode45 expects myEvent to have 2 input parameters, but you use 3.
Use
Opt = odeset('Events',@(t,u)myEvent(t,u,minu));
And I suggest you set
value = u(1) - minu;
  5 comentarios
Steven Lord
Steven Lord el 28 de Mzo. de 2020
You want your event function to be continuous (as the one Torsten suggested is) rather than discontinuous (like yours that uses <= is.)
The ODE solver will detect when the event function passes through zero.
Lazaros Christoforidis
Lazaros Christoforidis el 28 de Mzo. de 2020
Ohh okay, noww it makes sense
Ευχαριστω, υγεια

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