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function test197
%TEST197 test large sparse split
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
rng ('default') ;
GrB.burble (0) ;
n = 2e6 ;
d = 1000 / n^2 ;
A.matrix = sprand (n, n, d) ; A.sparsity = 1 ;
A.matrix (:,1) = 1 ;
k = 1e6 ;
ns = [k k] ;
C2 {1,1} = A.matrix (1:k, 1:k) ;
C2 {1,2} = A.matrix (1:k, (k+1):n) ;
C2 {2,1} = A.matrix ((k+1):n, 1:k) ;
C2 {2,2} = A.matrix ((k+1):n, (k+1):n) ;
C1 = GB_mex_split (A, ns, ns) ;
for i = 1:length(ns)
for j = 1:length(ns)
C = C1 {i,j} ;
assert (isequal (C.matrix, C2 {i,j})) ;
end
end
fprintf ('test197: all tests passed\n') ;
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