MATLAB Answers

Albert Yam

Detect Inf or Nan in Embedded Matlab Function block

Asked by Albert Yam
on 7 Feb 2013
Is there a way to detect an Inf or Nan being calculated inside an Embedded Matlab block. Simulink does not produce an error, but when we generated code, an exception was found. We are looking to protect against them. The problem can be reduced to the following.
[Constant block=0] --> [Embedded MATLAB Function] --> [Display]
Embedded MATLAB Function
function y = fcn(u)
test = 1/u;
if test > 0
y = 1;
y = 0;
"Configuration Parameters > Diagnostics > Data Validity > Inf or NaN block output", is just that, checking block output, and does not report this. (Which surprised me.)
Note: Simulink 6.6.1


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1 Answer

Answer by Azzi Abdelmalek
on 7 Feb 2013
 Accepted Answer

Use isnan or isinf function


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What do you mean? I did not get it
isnan and isinf require that the variable carry a value of inf or nan. On our generated code being run on our target platform, when that occurs there is already an exception. It never gets a chance to check for inf or nan.
So my protection, is an attempt to prevent the inf from occurring.
Maybe there is a way to disable such error message in configuration parameters. I will check it.

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