private void calcYValueSum(){
  mYValueSum=0;
  for (int i=0; i < mYVals.size(); i++) {
    Entry e=mYVals.get(i);
    if (e != null)     mYValueSum+=Math.abs(e.getVal());
  }
}

private void calcYValueSum ( ) { mYValueSum = 0 ; for ( int i = 0 ; i < mYVals . size ( ) ; i ++ ) { Entry e = mYVals . get ( i ) ; if ( e != null ) mYValueSum += Math . abs ( e . getVal ( ) ) ; } }
calculates the sum of all y - values
