@Override
public Vector apply(SparseVector a, SparseVector b) {
VectorIterator these = a.nonZeroIterator();
VectorIterator those = b.nonZeroIterator();
VectorIterator both = these.orElseSubtract(those);
return both.toVector(factory);
}
@Override
public Vector apply(DenseVector a, SparseVector b) {
Vector result = a.copy(factory);
VectorIterator it = b.nonZeroIterator();
while (it.hasNext()) {
it.next();
result.update(it.index(), Vectors.asMinusFunction(it.get()));
}
return result;
}
@Override
public Vector apply(SparseVector a, DenseVector b) {
Vector result = b.multiply(-1.0, factory);
VectorIterator it = a.nonZeroIterator();
while (it.hasNext()) {
it.next();
result.update(it.index(), Vectors.asPlusFunction(it.get()));
}
return result;
}