sampler_mov_avg.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_MOVING_AVG_H_
#define MUI_SAMPLER_MOVING_AVG_H_
 
#include "../../config.h"
#include "../sampler.h"
#include <cmath>
 
namespace mui {
 
template<typename CONFIG=default_config, typename O_TP=typename CONFIG::REAL, typename I_TP=O_TP>
class sampler_moving_average {
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_moving_average( point_type bbox_ ) {
        bbox  = bbox_;
    }
 
    template<template<typename,typename> class CONTAINER>
    inline OTYPE filter( point_type focus, const CONTAINER<ITYPE,CONFIG> &data_points ) const {
        size_t n(0);
        OTYPE vsum(0);
        for( size_t i = 0 ; i < data_points.size() ; i++ ) {
            point_type dx(REAL(0.0));
            for (INT j = 0 ; j < CONFIG::D ; j++) {
                dx[j] = std::fabs(data_points[i].first[j] - focus[j]);
            }
            bool within = true;
            for( INT i = 0 ; within && i < CONFIG::D ; i++ ) within = within && ( dx[i] < bbox[i] );
            if ( within ) {
                vsum += data_points[i].second;
                n++;
            }
        }
        if (CONFIG::DEBUG) assert( n!=0 );
        return n ? ( vsum / OTYPE(n) ): OTYPE(0.);
    }
 
    inline geometry::any_shape<CONFIG> support( point_type focus, REAL domain_mag ) const {
        return geometry::box<CONFIG>( focus - REAL(0.5) * bbox, focus + REAL(0.5) * bbox );
    }
 
protected:
    point_type bbox;
};
 
}
 
#endif /* MUI_SAMPLER_MOVING_AVG_H_ */