User`s guide

Examples of C MEX-File S-Function Blocks
3-89
ssSetOffsetTime(S, 0, 0.0);
/*
* the second, discrete sample time, is user provided
*/
ssSetSampleTime(S, 1, mxGetPr(TS(S))[0]);
ssSetOffsetTime(S, 1, 0.0);
} /* end mdlInitializeSampleTimes */
#define MDL_INITIALIZE_CONDITIONS
/* Function: mdlInitializeConditions ==========================================
* Abstract:
* Initialize the states, numerator and denominator coefficients.
*/
static void mdlInitializeConditions(SimStruct *S)
{
int_T i;
int_T nContStates = ssGetNumContStates(S);
real_T *x0 = ssGetContStates(S);
int_T nCoeffs = nContStates + 1;
real_T *numBank0 = ssGetRWork(S);
real_T *denBank0 = numBank0 + nCoeffs;
int_T *activeBank = ssGetIWork(S);
/*
* The continuous states are all initialized to zero.
*/
for (i = 0; i < nContStates; i++) {
x0[i] = 0.0;
numBank0[i] = 0.0;
denBank0[i] = 0.0;
}
numBank0[nContStates] = 0.0;
denBank0[nContStates] = 0.0;
/*
* Set up the initial numerator and denominator.
*/
{
const real_T *numParam = mxGetPr(NUM(S));
int numParamLen = mxGetNumberOfElements(NUM(S));
const real_T *denParam = mxGetPr(DEN(S));
int denParamLen = mxGetNumberOfElements(DEN(S));
real_T den0 = denParam[0];
for (i = 0; i < denParamLen; i++) {
denBank0[i] = denParam[i] / den0;
}
for (i = 0; i < numParamLen; i++) {
numBank0[i] = numParam[i] / den0;