When you encounter an "unrecognized function", "undefined function", or "unknown function" error in a compiled MATLAB application, it typically indicates missing dependencies during the compilation process.
Common causes include:
- Function not on path: Ensure all functions are on the MATLAB path during compilation. Test your app or function before you compile it.
- P-File Dependencies: Without the M-file source code, dependency analysis cannot detect dependencies for P-files. The tool mentioned in this MATLAB answer can help.
- String arguments: Functions used in strings passed to 'feval', 'eval', 'evalc', or as ODE solver arguments cannot be located by dependency analysis.
- Callback Strings: MATLAB Compiler does not look for functions in callback strings. Change the string reference to your function to a function handle.
To include any function dependencies explicitly, you can add %#function pragma statements to your code:
Refer to the "Callback Problems Due to Missing Functions" section on the following page for further details, examples, and workarounds for missing dependencies:
