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Add the %#codegen directive (or pragma) to your function after the function signature to indicate that you intend to generate code for the MATLAB^® algorithm. Adding this directive instructs the MATLAB code analyzer to help you diagnose and fix violations that would result in errors during code generation.

Note:   The %#codegen directive is not necessary for MATLAB Function blocks. Code inside a MATLAB Function block is always intended for code generation. The %#codegen directive, or the absence of it, does not change the error checking behavior.