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function test81
%TEST81 test GrB_Matrix_extract with index range, stride, & backwards
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('test81: GrB_Matrix_extract with index range, stride, backwards\n') ;
rng ('default') ;
n = 10 ;
A = sprand (n, n, 0.5) ;
S = sparse (n, n) ;
Ahyper.matrix = A ;
Ahyper.is_hyper = true ;
Ahyper.is_csc = true ;
for jlen = 1:2:n
JJ {jlen} = randperm (n) ;
end
for ilo = 1:2 % 1:2:n
for ihi = [4 8] % 1:2:n
for i_inc = [-10 2 inf] % [-n:n inf]
clear I
I.begin = ilo-1 ;
I.end = ihi-1 ;
if (isfinite (i_inc))
I.inc = i_inc ;
iinc = i_inc ;
else
iinc = 1 ;
end
clear Ivec
I_vec = [I.begin, I.end, iinc]' ;
Ivec.sparsity = 8 ; % full
if (nnz (I_vec) == 3)
I_vec = sparse (I_vec) ;
Ivec.sparsity = 2 ; % sparse
end
Ivec.matrix = I_vec ;
if (ihi == 8)
Ivec.sparsity = 4 ; % bitmap
end
Ivec.class = 'double' ;
for jlen = [1:2:n]
clear J
J = JJ {jlen} ;
J = J (1:jlen) ;
J0 = (uint64 (J) - 1)' ;
C1 = A (ilo:iinc:ihi, J) ;
[sm sn] = size (C1) ;
S = sparse (sm, sn) ;
C2 = GB_mex_Matrix_extract (S, [ ], [ ], A, I, J0, [ ]) ;
assert (isequal (C1, C2.matrix)) ;
C3 = GB_mex_Matrix_extract (S, [ ], [ ], ...
Ahyper, I, J0, [ ]) ;
assert (isequal (C1, C3.matrix)) ;
clear desc
desc.rowindex_list = 'is_stride' ;
J0_double = double (J0) ;
C4 = GB_mex_Matrix_extract (S, [ ], [ ], A, Ivec, J0_double, desc, 1) ;
assert (isequal (C1, C4.matrix)) ;
clear Jvec
C6 = A (ilo:iinc:ihi, 1:4) ;
Jvec.matrix = [2 3 4 1]' ;
Jvec.sparsity = 8 ;
Jvec.class = 'double' ;
desc.colindex_list = 'use_indices' ;
% Jvec
% Jvec.matrix
S = sparse (sm, 4) ;
C5 = GB_mex_Matrix_extract (S, [ ], [ ], A, Ivec, Jvec, desc, 1) ;
% C6
% C5.matrix
assert (isequal (C6, C5.matrix)) ;
Iv = [1 2]' ;
try
C4 = GB_mex_Matrix_extract (S, [ ], [ ], A, Iv, J0, ...
desc, 1) ;
ok = 0 ;
catch me
ok = 1 ;
end
assert (ok) ;
end
for jlo = 1:2:n
for jhi = 1:2:n
for j_inc = [-n:n inf]
clear J
J.begin = jlo-1 ;
J.end = jhi-1 ;
if (isfinite (j_inc))
J.inc = j_inc ;
jinc = j_inc ;
else
jinc = 1 ;
end
Jvec = [J.begin, J.end, jinc]' ;
C1 = A (ilo:iinc:ihi, jlo:jinc:jhi) ;
[sm sn] = size (C1) ;
S = sparse (sm, sn) ;
C2 = GB_mex_Matrix_extract (S, [ ], [ ], A, I, J, [ ]) ;
assert (isequal (C1, C2.matrix)) ;
C3 = GB_mex_Matrix_extract (S, [ ], [ ], ...
Ahyper, I, J, [ ]) ;
assert (isequal (C1, C3.matrix)) ;
clear desc
desc.rowindex_list = 'is_stride' ;
desc.colindex_list = 'is_stride' ;
C4 = GB_mex_Matrix_extract (S, [ ], [ ], A, ...
Ivec, Jvec, desc, 1) ;
assert (isequal (C1, C4.matrix)) ;
end
end
end
end
end
end
fprintf ('\ntest81: all tests passed\n') ;
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