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function C = mat2cell (A, m, n)
%MAT2CELL Break matrix up into a cell array of matrices.
%
% C = mat2cell (A,m,n) breaks up the 2D @GrB matrix A into a cell array of
% submatrices, where C{i,j} has size m(i)-by-n(j), and where sum(m) must
% equal the number of rows of A, and sum(n) must equal the number of columns
% of A. The size of C is length(m)-by-length(n).
%
% Example:
% A = GrB ([1 2 3 4; 5 6 7 8; 9 10 11 12]) ;
% C = mat2cell (A, [1 2], [1 3])
%
% The example creates a 2-by-2 cell array C, where:
%
% C{1,1} = A (1,1) ; % of size 1-by-1
% C{1,2} = A (1,2:3) ; % of size 1-by-3
% C{2,1} = A (2:3,1) ; % of size 2-by-1
% C{2,2} = A (2:3,2:3) ; % of size 2-by-3
%
% If the 3rd argument n is not present, it defaults to size(A,2), so that
% C is a length(m)-by-1 cell array of matrices, and C{i} has size
% m(i)-by-size(A,2).
%
% See also GrB/horzcat, GrB/vertcat, GrB/cat, GrB.cell2mat, GrB/num2cell.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
if (isobject (A))
A = A.opaque ;
if (nargin < 3)
[~, n] = gbsize (A) ;
end
else
m = double (m) ;
if (nargin < 3)
n = size (A, 2) ;
end
end
C = gbsplit (A, m, n) ;
for k = 1:numel(C)
C {k} = GrB (C {k}) ;
end
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