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 because the generated code is calling my_alg directly. This eliminates over 1K of memory usage.

TLC S-Function Wrapper

Fully Inlined S-Functions