Code Generation Readiness Screening in the MATLAB Coder App
By default, the MATLAB® Coder™ app screens your MATLAB code for features and functions that code generation does not support. After you enter entry-point functions and click Next, if the app detects issues, it opens the Review Code Generation Readiness page.
If you click Review Issues, you can use the app editor to fix issues before you generate code.
If the code generation readiness screening causes slow operations
in the app, consider disabling the screening. To disable code generation
readiness screening, on the app toolbar, click 
and clear Check
code generation readiness.
If you clear Check code generation readiness during or after screening, the app retains the screening results for the current session. If you fix or introduce code generation readiness issues in your code, the app does not update the screening results. To clear screening results after you disable screening, or to update screening results after you reenable screening, close and reopen the project.
For a fixed-point conversion project, code generation readiness screening identifies functions that do not have fixed-point support. The app lists these functions on the Function Replacements tab of the Convert to Fixed Point page where you can specify function replacement with a custom function or a lookup table. If you disable screening, do not rely on the app to identify functions that you must replace. Manually enter the names of functions on the Function Replacements tab. Fixed-point conversion requires a Fixed-Point Designer™ license.
Code generation readiness screening is not supported in MATLAB Online™.