compute_stuff_from_pair_index.m

function result = compute_stuff_from_pair_index(sample_date, random_pair_count, xyz_from_tile_index, raw_tile_map, relative_path_from_tile_index)
    raw_tile_map_shape = size(raw_tile_map) ;
    tile_count = length(relative_path_from_tile_index) ;
    random_pair_done_count = 0 ;
    rng(0) ;  % seed the RNG to get a repeatable sequence of random ints
    match_count_from_pair_index = zeros(random_pair_count, 1) ;
    center_tile_xyz_from_pair_index = zeros(random_pair_count, 3) ;
    center_tile_relative_path_from_pair_index = cell(random_pair_count, 1) ;
    while random_pair_done_count < random_pair_count ,
        center_tile_index = randi(tile_count, 1) ;
        center_xyz = xyz_from_tile_index(center_tile_index, :) ;
        other_xyz = center_xyz + [0 0 1] ;
        if all(other_xyz <= raw_tile_map_shape) ,
            other_tile_relative_path = raw_tile_map{other_xyz(1), other_xyz(2), other_xyz(3)} ;
            if ~isempty(other_tile_relative_path) ,
                center_tile_relative_path = relative_path_from_tile_index{center_tile_index} ;
                match_count = ...
                    compute_pointmatch_on_single_pair_in_live_sample(sample_date, center_tile_relative_path, other_tile_relative_path) ;
                random_pair_done_count = random_pair_done_count + 1 ;
                % Store things for the just-done pair
                random_pair_index = random_pair_done_count ;
                match_count_from_pair_index(random_pair_index) = match_count ;
                center_tile_xyz_from_pair_index(random_pair_index,:) = center_xyz ;
                center_tile_relative_path_from_pair_index{random_pair_index} = center_tile_relative_path ;
            end
        end
    end
    
    % Package into a single result
    result = struct('match_count_from_pair_index', {match_count_from_pair_index}, ...
                    'center_tile_xyz_from_pair_index', {center_tile_xyz_from_pair_index}, ...
                    'center_tile_relative_path_from_pair_index', {center_tile_relative_path_from_pair_index}) ;
end