Error Handling WITHOUT using try-catch statments

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Will
Will 2011-5-19
Hello,
I am trying to convert some of my MATLAB functions in to a form that is compatible with Embedded MATLAB.
I have a try-catch statement that attempts to run a simulation (try) and if the simulation fails (catch) returns a zero. By doing this the function can deal with failed simulations without crashing.
Unfortunately embedded MATLAB does not allow try-catch statements.
Does anyone know of a way I can handles this error without using try-catch?
Thanks.
  2 个评论
Kaustubha Govind
Kaustubha Govind 2011-5-19
Do you mean that you are simulating another model from within an Embedded MATLAB Block in a Simulink model? Is there a reason you chose to use the Embedded MATLAB block as opposed to the Model reference block?
One potential solution would be to perform the try-catch in a separate MATLAB function, which is called from the Embedded MATLAB block after declaring it using eml.extrinsic (coder.extrinsic starting in R2011a).
Will
Will 2011-5-19
No I am writing an m-file which conforms to the Embedded MATLAB rules - then I am going to convert it to C-code. It will not be put inside a Simulink model.
I also know you cannot use the MATLAB 'sim' command so I am having to write my own C interface to replace the aspects of the m-file which use the sim command.

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回答（2 个）

Arnaud Miege
Arnaud Miege 2011-5-19
I wouldn't recommend trying to run a Simulink model within an Embedded MATLAB Function, which itself resides in another Simulink model. It means that at each time step of the "caller" model, you're running a simulation of the "called" model. This is extremely inefficient as you could potentially have thousands of time steps. As suggested, a better solution would be to use a Model Reference to include the "called" model by reference into the "caller" model.
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Arnaud Miege
Arnaud Miege 2011-5-20
I'm not sure, sorry. One thing is with the generated C code, you only work one time step at a time, there's no notion of simulation time, so I'm not sure it makes sense to think of a simulation having failed.
Will
Will 2011-5-23
Ok. Well I will have a look through the generated code to see how/if it deals with NaNs at a given time step - if I can catch the NaNs in the generated code then essentially I can determine whether the simulation has failed.

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Walter Roberson
Walter Roberson 2011-5-19
The only error control mechanism supported by C is signals. I don't know if error conditions produce signals; I do not recall having heard anyone refer to that as a possibility.

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