@Override public String toString(){
  String s="[";
  for (  Double d : getVector()) {
    s+=StringUtils.getShortForm(d) + ",";
  }
  return s.substring(0,s.length() - 1) + "]";
}

@ Override public String toString ( ) { String s = "[" ; for ( Double d : getVector ( ) ) { s += StringUtils . getShortForm ( d ) + "," ; } return s . substring ( 0 , s . length ( ) - 1 ) + "]" ; }
returns a string representation of the array
