code: public static Vector1d convert(Tuple1d<?> tuple) {
  		if (tuple instanceof Vector1d) {
  			return (Vector1d) tuple;
  		}
  		return new Vector1d(tuple.getSegment(), tuple.getX(), tuple.getY());
  	}
docs: Convert the given tuple to a real Vector1d.
  
  <p>If the given tuple is already a Vector1d, it is replied.
  
  @param tuple the tuple.
  @return the Vector1d.
  @since 14.0