Does not support bus input and output signals.

Cannot incorporate legacy code during simulation, only during code generation through a TLC file.

Does not support bus input and output signals.

Does not support model referencing under all circumstances. See Simulink Model Referencing Limitations in Using Simulink for details.

Generates S-function code using a wrapper function which incurs additional overhead.

Does not support the following S-function features:

• Work vectors

• Port-based sample times

• Multiple sample times or a nonzero offset time

• Dynamically-sized input and output signals for an S-function with multiple input and output ports

Note   S-functions with one input and one output port can have dynamically-sized signals

Generates C MEX S-functions for existing functions written in C or C++ only. The tool does not support transformation of MATLAB or Fortran functions.

Can interface with C++ functions, but not C++ objects.

Does not support simulating continuous or discrete states.

Does not support use of function pointers as the output of the legacy function being called.

Always sets the S-function's flag for direct feedthrough (sizes.DirFeedthrough) to true.

Supports only the continuous, but fixed in minor time step, sample time and offset option.

Supports complex numbers, but only with Simulink built-in data types.

Does not support the following S-function features:

• Work vectors, other then general DWork vectors

• Frame-based input and output signals

• Port-based sample times

• Multiple block-based sample times