finding_true_num_2D.m

function [dis_min, true_num] = finding_true_num_2D(p0,p_s)

% =========================================================================
% sub function called by iterative particle reconstruction
% determine the true particle in the original volume 
% that the reconstructed particle corresponds to.
% by Tianqi Guo, Aug 2017
% =========================================================================

% calculate the distance in x, y, z the reconstructed particle with
% all the true particles in the original volume
du_i = (p0(:,1) - p_s(ones(size(p0,1),1),1));
dv_i = (p0(:,2) - p_s(ones(size(p0,1),1),2));

% finding the closest true particle and return the distance
g_t = sum([du_i dv_i].^2,2).^0.5;
[dis_min, true_num] = min(g_t);

end