public void updateNonZeroInRow(int i, MatrixFunction function, int fromColumn, int toColumn) {
ByteVectorIterator it = nonZeroRowIterator(i, fromColumn, toColumn);
while (it.hasNext()) {
it.next();
it.set(function.evaluate(i, it.index(), it.get()));
}
}
@Override
public void updateNonZeroInColumn(int j, MatrixFunction function) {