MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Betriebsanweisung PDF herunterladen (Seite 199)

Fully Inlined S-Function with the mdlRTW Routine

4-33

cache->evenlySpaced = FALSE;

}

#endif /* MDL_START */

/* Function: mdlOutputs ========================================================

* Abstract:

* In this function, we compute the outputs of our S-function

* block. Generally outputs are placed in the output vector, ssGetY(S).

static void mdlOutputs(SimStruct *S, int_T tid)

{

SFcnCache *cache = ssGetUserData(S);

real_T *xData = mxGetPr(XVECT(S));

real_T *yData = mxGetPr(YVECT(S));

InputRealPtrsType uPtrs = ssGetInputPortRealSignalPtrs(S,0);

real_T *y = ssGetOutputPortRealSignal(S,0);

int_T ny = ssGetOutputPortWidth(S,0);

int_T xLen = mxGetNumberOfElements(XVECT(S));

int_T i;

* When the XData is evenly spaced, we use the direct lookup algorithm

* to calculate the lookup

if (cache->evenlySpaced) {

real_T spacing = xData[1] - xData[0];

for (i = 0; i < ny; i++) {

real_T u = *uPtrs[i];

if (u <= xData[0]) {

y[i] = yData[0];

} else if (u >= xData[xLen-1]) {

y[i] = yData[xLen-1];

} else {

int_T idx = (int_T)((u - xData[0])/spacing);

y[i] = yData[idx];

}

} else {

* When the XData is unevenly spaced, we use a bisection search to

* locate the lookup index.

for (i = 0; i < ny; i++) {

int_T idx = GetDirectLookupIndex(xData,xLen,*uPtrs[i]);

y[i] = yData[idx];

}

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