How can m-file neglect the error "There maybe a singularity in the solution" , produced by Simulink, and does not stop?

2 次查看（过去 30 天）
Mohammad Javad Maghsoudi
I am running an optimization code in m-file that includes a command to run a Simulink file in every iteration.
sim('Controller_tune_pd',[0:10]);
The program will run Simulink more than 2000 times with different input values. Sometimes these values will cause the singularity in solution and produces the error that stops my m-file.
??? Error using ==> sim Derivative input 3 of 'P_PID/PLANT/Integrator2' at time 0.3750000000000001 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).
Please inform me how may the m-file neglect this error and continue to the program. I am using fixed step size and I can not reduce it. I do not want to remove the error. I want it to be neglected by m-file during running.
  1 个评论
Yao Li
Yao Li 2013-5-14
That is expected. Add memory block to the closed loop which will give an initial value. Also, double check your model to make sure in every step any denominators won't be zero.

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回答（2 个）

Yao Li
Yao Li 2013-5-13
You can try warning('off','message_id'). However, this warning indicates that there may be a singlarity in certain closed loop. You'd better add a memory block to give an initial value of each closed loop.
Kaustubha Govind
Kaustubha Govind 2013-5-14
How about using try/catch to catch and ignore the exception thrown by the SIM command.
  1 个评论
Saeed
Saeed 2013-5-26
编辑：Saeed 2013-5-26
Can try/catch command be used for several similar try statements and one catch statements? Ex:
try
create model1(option1)
create model2(option2)
create model3(option3)
catch exception
error
end

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