Writing S-Functions

The Inlined Code

The code generated when you inline your wrapper S-function is similar to the default generated code. The MdlTerminate function no longer contains a call to an empty function and the MdlOutputs function now directly calls my_alg.

void MdlOutputs(int_T tid)
{
  /* Sin Block: <Root>/Sin */
  rtB.Sin = rtP.Sin.Amplitude *
    sin(rtP.Sin.Frequency * ssGetT(rtS) + rtP.Sin.Phase);

  /* S-Function Block: <Root>/S-Function */
  rtB.S_Function = my_alg(rtB.Sin);

  /* Outport Block: <Root>/Out */
  rtY.Out = rtB.S_Function;
}

In addition, wrapper.reg no longer creates a child SimStruct for the S-function since the generated code is calling my_alg directly. This eliminates over 1K of memory usage.

The TLC S-Function Wrapper

Fully Inlined S-Functions