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tomo/+tomo/iradonfast_v3_split.m

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+% tomogram = iradonfast_v3_split(p, theta, varargin)
+% FUNCTION  wrapper around iradonfast_v3 that automatically splits the data into
+% smaller blocks to avoid too large memory allocation 
+% Inputs / Outputs: same as for iradonfast_v3
+
+    
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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 tomogram = iradonfast_v3_split(p, theta, varargin)
+
+    
+    [Nlayers,tomo_size,Nangles] = size(p) ; 
+    block_size = ceil(2e9/(tomo_size*Nangles*4)); % split the task into ~2GB blocks 
+    Nblocks = ceil(Nlayers / block_size ); 
+
+    % preallocate array to store results 
+    tomogram = zeros(tomo_size, tomo_size, Nlayers, 'single');
+    
+    for ii = 1:Nblocks
+        ind = 1+(ii-1)*block_size:min(ii*block_size, Nlayers);
+        tomogram(:,:,ind) =tomo.iradonfast_v3(permute(p(ind,:,:),[2,3,1]), theta, varargin{:});   % Calculate slice
+    end
+end