Simulink Truth Table Action Language Whitespace

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Paul Rancuret
Paul Rancuret 2023-3-4
编辑： Paul Rancuret 2023-3-4
Simulink Truth Table Action Language Whitespace:
I've found that the action language for truth tables in Simulink do not support space characters before and after the equals sign. This was discovered in R2020b.
For example, the statement below will not compile:
x = true;
The statement below will compile:
x=true;
The error message that occurs when using the first statement does not indicate the problem is with whitespace. Instead, it implies that I used an '=' when I meant '==' or vice-versa, which wasn't the problem.
This was very difficult for me to track down the problem. I think a future update should either support spaces in the action language, or update the error handler so it mentions white space as a potential cause of the compile error in the error message. I also wanted to post this in case someone else runs into the same problem; perhaps they can search and find this.
More details when this was encountered:
  • Truth Table used within Stateflow Chart with Matlab action language
  • Data object 'x' existed in Chart context with 'boolean' data type and 'local' context
  • Conditions handled similarly (boolean data objects local to chart). Whitespace was used in conditional statements in the Truth Table with no error.
  • Truth Table code interface set to generate 'inlined' within Chart code.

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