Why do I get an "odezero: an event disappeared (internal error)" error when using an ODE events function in MATLAB 7.4 (R2007a)?
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I am trying to use an events function to in my ODE function. However, when I run the attached file 'ode_events_error.m' I am getting the following error message:
??? Error using ==> funfun\private\odezero at 50
odezero: an event disappeared (internal error)
Error in ==> ode45 at 419
[te,ye,ie,valt,stop] = ...
Error in ==> mycode at 10
[r,state,re,statee,ie] = ode45(@(r,state)prbode(r,state,tauc),rspan,stateinit,options);
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MathWorks Support Team
2009-6-27
This is a zero-crossing events error. The events locator is incapable of capturing a zero crossing for complex signals.
You can see this by adding the following code to the 'events' subfunction in 'ODE_events_error.m'function:
if ~isreal(state(2))
error('Imaginary Events signal (%g +i%g) at r=%.16f.',real(state(2)),imag(state(2)),r)
end
You will see that during the simulation the value state(2) becomes complex, and the following error message is returned:
??? Error using ==> mycode>events at 37
Imaginary Events signal (4.02767e-009 +i7.46735e-027) at r=2.7392559940601449.
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2009-6-27
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