User`s guide

Fully Inlined S-Function with the mdlRTW Routine
4-37
*/
for (;;) {
idx = (bottom + top)/2;
if (u < x[idx]) {
top = idx;
} else if (u > x[idx+1]) {
bottom = idx + 1;
} else {
/*
* We have: x[idx] <= u <= x[idx+1], only need
* to do two more checks and we have the answer.
*/
if (u < 0) {
/*
* We want right continuity, i.e.,
* if u == x[idx+1]
* then x[idx+1] <= u < x[idx+2]
* else x[idx ] <= u < x[idx+1]
*/
return( (u == x[idx+1]) ? (idx+1) : idx);
} else {
/*
* We want left continuity, i.e.,
* if u == x[idx]
* then x[idx-1] < u <= x[idx ]
* else x[idx ] < u <= x[idx+1]
*/
return( (u == x[idx]) ? (idx-1) : idx);
}
}
}
} /* end GetDirectLookupIndex */
/* [EOF] lookup_index.c */