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2026-09-17 23:59:11 +09:00 · 2026-08-07 15:56:42 +09:00
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+% MTIMES_STACK  Extension of @mtimes function for stacked images and GPU
+%
+%    C = mtimes_stack(A,B)
+%     returns the propagated wavefield
+%    Inputs: 
+%       **A           first matrix
+%       **B           second matrix 
+%    *returns*
+%       ++C           product matrix 
+%
+    
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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 C = mtimes_stack(A,B)
+
+    if isa(A, 'gpuArray') || isa(B, 'gpuArray')
+        C = pagefun(@mtimes, A,B); 
+        return
+    end
+
+    % CPU code 
+    if ismatrix(A) && ismatrix(B)
+        C = mtimes(A,B); 
+    elseif ismatrix(A) && ndims(B) == 3
+        Np = size(B);    
+        C = reshape(A*reshape(B,Np(1),[]), Np);
+    elseif ndims(A) == 3 && ismatrix(B)
+        Np = size(A);    
+        fdims = 1:ndims(A);
+        fdims(1:2) = [2,1]; 
+        C = permute(reshape(B*reshape(permute(A,fdims),Np(2),[]),Np(fdims)),fdims);
+    else
+        C = zeros(size(A,1), size(B,2), size(B,3), 'like', A);
+        for ii = 1:size(B,3)
+           C(:,:,ii) = A(:,:,ii) * B(:,:,ii); 
+        end
+    end
+
+end
+