public int size()
    {
        int ret = 0;
        for(Collection<LineSeriesItem<I,V>> series : data)
        {
            if(series.size() > 0)
                ++ret;
        }
        return ret;
    }
public int size ( ) { int ret = 0 ; for ( Collection < LineSeriesItem < I , V > > series : data ) { if ( series . size ( ) > 0 ) ++ ret ; } return ret ; }
Gets the size of the data.

@return the data