Hi Gabriel,
Regarding the unused return value from the prelookup function, I assume you have already checked the model configuration, ensured the correct model setup, and also tried code generation with the 'Interpolation Using Prelookup' block. The most probable cause seems to be dead code elimination. The optimization process employed by Embedded Coder might have determined that the return value does not affect the program's behavior and thus removed its usage.
As for the issue of array initialization, there could be two reasons: either the Embedded Coder is initializing the array before entering the conditional logic for determinism reasons, or, as you suggested, it is an artifact of optimization. You can check the code generation settings related to initialization and data handling.
Investigating these points may help to pinpoint the problem. Of course, the nuances of each model can shed more light on such issues, making them easier to unravel.
