imaging_moves.cpp

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#include <config.h>

#include <cstdlib>
#include <cmath>
#include <cassert>
#include <iostream>
#include <iomanip>

#include <inttypes.h>

#include <jwsc/base/limits.h>
#include <jwsc/prob/pdf.h>

#include <jwsc++/base/exception.h>

#include "sampler.h"
#include "imaging_model.h"
#include "imaging_moves.h"


using std::isinf;
using std::isnan;
using namespace jwsc;
using jwscxx::base::Exception;


bool Imaging_bg_move::run(Sampler_move_parameters* params) throw (Exception)
{
    params->init_proposals();

    Imaging_model_density* density = params->imaging->get_density()->clone();
    float mu    = params->imaging->get_bg();
    float sigma = density->get_bg().get_sigma();
    float min   = density->get_bg().get_min();
    float max   = density->get_bg().get_max();
    density->set_bg(mu, sigma, min, max);

    params->imaging_proposal->set_bg(density->sample_bg());

    delete density;

    params->alternaria_proposal->update_scene(params->psf_proposal, 
            params->imaging_proposal);

    params->ll_proposal = params->alternaria_proposal->calc_log_likelihood(
            params->psf_proposal, params->imaging_proposal, params->data,
            params->data_avg);

    double log_alpha = params->ll_proposal;
    log_alpha -= params->ll;
    log_alpha += params->imaging_proposal->get_log_prob();
    log_alpha -= params->imaging->get_log_prob();

#if defined ALTERNARIA_HAVE_ISINF && defined ALTERNARIA_HAVE_ISNAN
    assert(!isinf(log_alpha) && !isnan(log_alpha));
#endif

    double log_u = log(sample_uniform_pdf_d(JWSC_MIN_LOG_ARG, 1.0));

    if (log_u <= log_alpha)
    {
        return true;
    }
    return false;
}


const std::ostringstream& Imaging_bg_move::get_info
(
    Sampler_move_parameters* params
) 
{ 
    assert(params->imaging);
    info.str("");
    info << std::left << std::setprecision(4) << std::setw(9)
         << params->imaging->get_bg(); 
    return info;
}


const std::ostringstream& Imaging_bg_move::get_proposal_info
(
    Sampler_move_parameters* params
) 
{ 
    assert(params->imaging_proposal);
    proposal_info.str("");
    proposal_info << std::left << std::setprecision(4) << std::setw(9)
                  << params->imaging_proposal->get_bg(); 
    return proposal_info;
}