/** Extend or truncate the vector to a specified length. */
private static RVector<?> handleLengthOut(
RAbstractVector x, int lengthOut, boolean copyIfSameSize) {
if (x.getLength() == lengthOut) {
return (RVector<?>) (copyIfSameSize ? x.copy() : x);
}
return x.copyResized(lengthOut, false);
}
/** Replicate the vector a given number of times. */
private RVector<?> handleTimes(
RAbstractVector x, RAbstractIntVector times, boolean copyIfSameSize) {
if (oneTimeGiven.profile(times.getLength() == 1)) {
// only one times value is given
final int howManyTimes = times.getDataAt(0);
if (howManyTimes < 0) {
errorBranch.enter();
throw invalidTimes();
}
if (replicateOnce.profile(howManyTimes == 1)) {
return (RVector<?>) (copyIfSameSize ? x.copy() : x);
} else {
return x.copyResized(x.getLength() * howManyTimes, false);
}
} else {
// times is a vector with several elements
if (x.getLength() != times.getLength()) {
errorBranch.enter();
invalidTimes();
}
// iterate once over the times vector to determine result vector size
int resultLength = 0;
for (int i = 0; i < times.getLength(); i++) {
int t = times.getDataAt(i);
if (t < 0) {
errorBranch.enter();
throw invalidTimes();
}
resultLength += t;
}
// create and populate result vector
RVector<?> r = x.createEmptySameType(resultLength, x.isComplete());
int wp = 0; // write pointer
for (int i = 0; i < x.getLength(); i++) {
for (int j = 0; j < times.getDataAt(i); ++j, ++wp) {
r.transferElementSameType(wp, x, i);
}
}
return r;
}
}
