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+% 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
+