FsmwClusterizer1DNameSpace Namespace Reference

Functions
template<class T >
std::pair< typename std::vector< Cluster1D< T > >::const_iterator, typename std::vector< Cluster1D< T > >::const_iterator >	fsmw (const std::vector< Cluster1D< T > > &values, double fraction)

Function Documentation

template<class T >

std::pair< typename std::vector< Cluster1D<T> >::const_iterator,typename std::vector< Cluster1D<T> >::const_iterator > FsmwClusterizer1DNameSpace::fsmw	(	const std::vector< Cluster1D< T > > &	values,
		double	fraction
	)

Definition at line 53 of file FsmwClusterizer1D.h.

References begin, gather_cfg::cout, end, dedxEstimators_cff::fraction, FsmwClusterizer1D< T >::FsmwClusterizer1D(), i, createfilelist::int, connectstrParser::o, position, findQualityFiles::size, createBeamHaloJobs::stepsize, FsmwClusterizer1D< T >::theEstimator, FsmwClusterizer1D< T >::theFraction, FsmwClusterizer1D< T >::theNSigmaIn, MuonErrorMatrixValues_cff::values, and w.

Referenced by FsmwClusterizer1D< T >::operator()().

{
    typedef Cluster1D<T> Cluster1D;
    typename std::vector< Cluster1D >::const_iterator begin = values.begin();
    typename std::vector< Cluster1D >::const_iterator end = values.end()-1;

    while (1)
    {
#ifdef FsmwClusterizer1DDebug
        cout << "Begin at " << begin->position().value() << endl;
#endif

        const int size = (int) (end-begin);
#ifdef FsmwClusterizer1DDebug

        cout << "Size " << size << endl;
#endif

        int stepsize = (int) floor ( ( 1+ size ) * fraction );
        if ( stepsize == 0 )
            stepsize=1;
#ifdef FsmwClusterizer1DDebug

        cout << "Old end at " << end->position().value() << endl;
#endif

        end=begin+stepsize;
        typename std::vector< Cluster1D >::const_iterator new_begin = begin;
        typename std::vector< Cluster1D >::const_iterator new_end = end;

#ifdef FsmwClusterizer1DDebug

        cout << "New end at " << end->position().value() << endl;
        cout << "stepsize " << stepsize << endl;
#endif

        // Old version: used the weights of just the end points
        // double totalweight = begin->weight() + end->weight();

        // new version: sums up the weights of all points involved
        // _including_ the "end" point
        double totalweight = end->weight();
        for ( typename std::vector< Cluster1D >::const_iterator w=begin; w!=end ; ++w )
        {
            totalweight+=w->weight();
        };

        double div=fabs ( end->position().value() - begin->position().value() ) /
                   totalweight;
#ifdef FsmwClusterizer1DDebug

        cout << "Div at " << begin->position().value() << ":" << (end)->position().value()
        << " = " << div << endl;
#endif

        for ( typename std::vector< Cluster1D >::const_iterator i = (begin + 1);
                i!=(begin + size - stepsize + 1); ++i )
        {
            // FIXME wrong
            // double tmpweight = i->weight() + (i+stepsize)->weight();
            //
            // new version: sums up the weights of all points in the interval
            // _including_ the end point (i+stepsize)
            double tmpweight = 0.;
            for ( typename std::vector< Cluster1D >::const_iterator wt=i; wt!=(i+stepsize+1); ++wt )
            {
                tmpweight+=wt->weight();
            };

            double tmpdiv = fabs( i->position().value() - (i+stepsize)->position().value() )
                            / tmpweight;
#ifdef FsmwClusterizer1DDebug

            cout << "Div at " << i->position().value() << ":" << (i+stepsize)->position().value()
            << " = " << tmpdiv << endl;
#endif

            if ( tmpdiv < div)
            {
                new_begin= i;
                new_end = i+stepsize;
                div= tmpdiv;
            };
        };
#ifdef FsmwClusterizer1DDebug

        cout << "---- new interval: " << new_begin->position().value()
        << ":" << new_end->position().value() << endl;
#endif

        begin = new_begin;
        end = new_end;
        if ( size < 4 )
            break;
    };

    std::pair < typename std::vector< Cluster1D >::const_iterator,
    typename std::vector< Cluster1D >::const_iterator > ret ( begin, end );
    return ret;
}