MATLAB: Stop Ode45 when y is less than a value

eventode45

%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);

Best Answer

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;
Related Question