public boolean removeDataSet(T d){
  if (d == null)   return false;
  boolean removed=mDataSets.remove(d);
  if (removed) {
    calcMinMax();
  }
  return removed;
}

public boolean removeDataSet ( T d ) { if ( d == null ) return false ; boolean removed = mDataSets . remove ( d ) ; if ( removed ) { calcMinMax ( ) ; } return removed ; }
removes the given dataset from this data object . also recalculates all minimum and maximum values . returns true if a dataset was removed , false if no dataset could be removed .
