% FUNCTION full_array = add_to_3D(full_array, small_array, position)
% add one small 3D block into large 3D array 
%  Inputs: 
%       full_array
%       small_array
%       position - offset from (1,1,1) coordinate in pixels 

% *-----------------------------------------------------------------------*
% |                                                                       |
% |  Except where otherwise noted, this work is licensed under a          |
% |  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
% |  International (CC BY-NC-SA 4.0) license.                             |
% |                                                                       |
% |  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
% |                                                                       |
% |       Author: CXS group, PSI                                          |
% *-----------------------------------------------------------------------*
% You may use this code with the following provisions:
% 
% If the code is fully or partially redistributed, or rewritten in another
%   computing language this notice should be included in the redistribution.
% 
% If this code, or subfunctions or parts of it, is used for research in a 
%   publication or if it is fully or partially rewritten for another 
%   computing language the authors and institution should be acknowledged 
%   in written form in the publication: “Data processing was carried out 
%   using the “cSAXS matlab package” developed by the CXS group,
%   Paul Scherrer Institut, Switzerland.” 
%   Variations on the latter text can be incorporated upon discussion with 
%   the CXS group if needed to more specifically reflect the use of the package 
%   for the published work.
% 
% A publication that focuses on describing features, or parameters, that
%    are already existing in the code should be first discussed with the
%    authors.
%   
% This code and subroutines are part of a continuous development, they 
%    are provided “as they are” without guarantees or liability on part
%    of PSI or the authors. It is the user responsibility to ensure its 
%    proper use and the correctness of the results.
% 
% 
%    
function full_array = add_to_3D(full_array, small_array, position)

    position = round(position);
    N_f = size(full_array);
    N_s = size(small_array);

    for i = 1:ndims(full_array)
        ind_f{i} = unique(min(N_f(i),max(1,position(i)+(1:N_s(i)))));
        ind_s{i} = unique(min(N_s(i),max(1,ind_f{i}-position(i))));
    end

    full_array(ind_f{:}) = full_array(ind_f{:}) + small_array(ind_s{:});


end