sampler_pseudo_n2_linear.h

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/*****************************************************************************
* Multiscale Universal Interface Code Coupling Library                       *
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* Copyright (C) 2019 Y. H. Tang, S. Kudo, X. Bian, Z. Li, G. E. Karniadakis  *
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#ifndef MUI_SAMPLER_PSEUDO_N2_LINEAR_H_
#define MUI_SAMPLER_PSEUDO_N2_LINEAR_H_
 
#include "../../config.h"
#include "../sampler.h"
 
namespace mui {
 
template<typename CONFIG=default_config, typename O_TP=typename CONFIG::REAL, typename I_TP=O_TP>
class sampler_pseudo_n2_linear {
public:
    using OTYPE      = O_TP;
    using ITYPE      = I_TP;
    using REAL       = typename CONFIG::REAL;
    using INT        = typename CONFIG::INT;
    using point_type = typename CONFIG::point_type;
 
    sampler_pseudo_n2_linear( REAL h_ ) : h(h_) {}
 
    template<template<typename,typename> class CONTAINER>
    inline OTYPE filter( point_type focus, const CONTAINER<ITYPE,CONFIG> &data_points ) const {
        REAL r2min_1st = std::numeric_limits<REAL>::max();
        REAL r2min_2nd = std::numeric_limits<REAL>::max();
        OTYPE value_1st = 0, value_2nd = 0;
        for( size_t i = 0 ; i < data_points.size() ; i++ ) {
            REAL dr2 = normsq( focus - data_points[i].first );
            if ( dr2 < r2min_1st ) {
                r2min_2nd = r2min_1st;
                value_2nd = value_1st;
                r2min_1st = dr2;
                value_1st = data_points[i].second ;
            } else if ( dr2 < r2min_2nd ) {
                r2min_2nd = dr2;
                value_2nd = data_points[i].second ;
            }
        }
        REAL r1 = std::sqrt( r2min_1st );
        REAL r2 = std::sqrt( r2min_2nd );
        return ( value_1st * r2 + value_2nd * r1 ) / ( r1 + r2 );
    }
 
    inline geometry::any_shape<CONFIG> support( point_type focus, REAL domain_mag ) const {
        return geometry::sphere<CONFIG>( focus, h );
    }
protected:
    REAL h;
};
 
}
 
#endif /* MUI_SAMPLER_NN_H_ */