protected void update(Comparable x,Object y){
  int index=indexOf(x);
  if (index < 0) {
    throw new SeriesException("No observation for x = " + x);
  }
 else {
    ComparableObjectItem item=getDataItem(index);
    item.setObject(y);
    fireSeriesChanged();
  }
}

protected void update ( Comparable x , Object y ) { int index = indexOf ( x ) ; if ( index < 0 ) { throw new SeriesException ( "No observation for x = " + x ) ; } else { ComparableObjectItem item = getDataItem ( index ) ; item . setObject ( y ) ; fireSeriesChanged ( ) ; } }
updates an item in the series .
