Why is the frequency parameter generated for the Sine waveform of the Signal Generator block generator block different in R2013b?

Why is the frequency parameter generated for the Sine waveform of the Signal Generator block generator block different in R2013b?

Building the same model in R2013a and R2013b yields the following code.

R2013a parameter structure example:

P_myModel_T myModel_P = {

    1.0,                   /* Expression: 1
                            * Referenced by: '<Root>/Signal Generator'
                            */

    1.0                    /* Expression: 1
                            * Referenced by: '<Root>/Signal Generator'
                            */
  };

 

R2013b parameter structure example:

P_myModel_T myModel_P = {

    1.0,                   /* Expression: 1
                            * Referenced by: '<Root>/Signal Generator'
                            */

    6.2831853071795862     /* Expression: 1
                            * Referenced by: '<Root>/Signal Generator'
                            */
  };

 

 

Answer 1

[MathWorks Support Team]

In R2013b there was a code generation enhancement made to the Signal Generator block to remove an unnecessary conversion between hertz and rad/sec.  As part of this update the default units for frequency of the sine waveform of the block updated from hertz to rad/sec.

Dragging a new Signal Generator block from R2013a yields:

 

Dragging a new Signal Generator block from R2013b yields:

An example of the computation for R2013a is as follows:

       /* SignalGenerator: '<Root>/Signal Generator' */
       temp = 6.2831853071795862 * myModel_M->Timing.t[0];
       genSignal = sin(myModel_P.SignalGenerator_Frequency * temp) *
         myModel_P.SignalGenerator_Amplitude;

 

An example of the computation for R2013b is as follows:

       /* SignalGenerator: '<Root>/Signal Generator' */
       genSignal = sin(myModel_P.SignalGenerator_Frequency * myModel_M->Timing.t[0]) *
         myModel_P.SignalGenerator_Amplitude;