User`s guide

3 Writing S-Functions As C-MEX files
3-88
* NumBank1Coeffs
* DenBank1Coeffs)
* Number of Integer work elements: 2 (indicator of active bank 0 or 1
* and flag to indicate when banks
* have been updated).
*
* The number of inputs arises from the following:
* o 1 input (u)
* o the numerator and denominator polynomials each have NumContStates+1
* coefficients
*/
nCoeffs = mxGetNumberOfElements(DEN(S));
nContStates = nCoeffs - 1;
ssSetNumContStates(S, nContStates);
ssSetNumDiscStates(S, 0);
if (!ssSetNumInputPorts(S, 1)) return;
ssSetInputPortWidth(S, 0, 1 + (2*nCoeffs));
ssSetInputPortDirectFeedThrough(S, 0, 0);
if (!ssSetNumOutputPorts(S,1)) return;
ssSetOutputPortWidth(S, 0, 1);
ssSetNumSampleTimes(S, 2);
ssSetNumRWork(S, 4 * nCoeffs);
ssSetNumIWork(S, 2);
ssSetNumPWork(S, 0);
ssSetNumModes(S, 0);
ssSetNumNonsampledZCs(S, 0);
/* Take care when specifying exception free code - see sfuntmpl.doc */
ssSetOptions(S, SS_OPTION_EXCEPTION_FREE_CODE);
} /* end mdlInitializeSizes */
/* Function: mdlInitializeSampleTimes =========================================
* Abstract:
* This function is used to specify the sample time(s) for the
* S-function. This S-function has two sample times. The
* first, a continuous sample time, is used for the input to the
* transfer function, u. The second, a discrete sample time
* provided by the user, defines the rate at which the transfer
* function coefficients are updated.
*/
static void mdlInitializeSampleTimes(SimStruct *S)
{
/*
* the first sample time, continuous
*/
ssSetSampleTime(S, 0, CONTINUOUS_SAMPLE_TIME);