Target Language Compiler

Modify the Model

1. Delete the Sine Wave block, then replace it with a Constant block from the Library Browser.
2. Set the parameter for the constant block to 1:10, and change the top label, model: simple_sin, to model: simple_vec.
3. Rename the model; save your changes to simple_vec.mdl (in your working directory). The diagram now looks like this.

4. Because the Constant block generates a vector of values, this is a vectorized model. Generate code for the model and view the MdlOutputs() section of simple_vec.c in your editor to observe how variables and for-loops are handled. This function appears as follows:

• /* Compute block outputs */
  void MdlOutputs(int_T tid)
  {
    /* This is a single rate system */
    (void)tid;
  
    /* Outport: '<Root>/Out' incorporates:
     *   Gain: '<Root>/Gain'
     *   Constant: '<Root>/Constant'
     *
     * Regarding '<Root>/Gain':
     *   Gain value: rtP.Gain_Gain
     */
    {
      int_T i1;
      real_T *y0 = &rtY.Out[0];
  
      for (i1=0; i1 < 10; i1++) {
        y0[i1] = (rtP.Gain_Gain * rtP.Constant_Value[i1]);
      }
    }
  }
  

Notice that:

• By default (when the number of iterations exceeds 5), the code that generates model outputs gets "rolled" into a loop.
• Loop index i1 runs from 0 to 9.
• Pointer *y0 is used and initialized to the output signal array.

Getting Started

Change the Loop Rolling Threshold