If you use varargin to define an argument to an entry-point function, the code generator produces the function with a fixed number of arguments. This fixed number of arguments is based on the number of arguments that you specify when you generate code.

You cannot write to varargin. If you want to write to input arguments, copy the values into a local variable.

To index into varargin and varargout, use curly braces {}, not parentheses ().

The code generator must be able to determine the value of the index into varargin or varargout.