Create S-function from C code that you provide
The S-Function Builder block creates a C MEX S-function from specifications and C source code that you provide. See Build S-Functions Automatically for detailed instructions on using the S-Function Builder block to generate an S-function.
Instances of the S-Function Builder block also serve as wrappers for generated S-functions in Simulink® models. When simulating a model containing instances of an S-Function Builder block, Simulink software invokes the generated S-function associated with each instance to compute the instance's output at each time step.
The S-Function Builder can accept and output complex, 1-D, or 2-D signals and nonvirtual buses. For each of these cases, the signals must have a data type that Simulink supports.
For more information, see Data Types Supported by Simulink in the Simulink documentation.
See S-Function Builder Dialog Box in the online documentation for information on using the S-Function Builder block's parameter dialog box.