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function gbtest63
%GBTEST63 test GrB.incidence
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
rng ('default') ;
for trial = 1:2
if (trial == 1)
ij = [
4 1
1 2
4 3
6 3
7 3
1 4
7 4
2 5
7 5
3 6
5 6
2 7 ] ;
W = sparse (ij (:,1), ij (:,2), ones (12,1), 8, 8) ;
else
% load west0479 ; %#ok<*LOAD>
% W = west0479 ;
load west0479_correct ; %#ok<*LOAD>
W = Problem.A ;
end
W = spones (GrB.offdiag (W)) ;
A = digraph (W) ;
G = GrB (W) ;
E0 = incidence (A) ;
E1 = GrB.incidence (G) ;
% E0 and E1 are the same, except the columns are in different orders
E0 = sortrows (E0')' ;
E1 = double (E1) ;
E1 = sortrows (E1')' ;
assert (isequal (E0, E1)) ;
E1 = GrB.incidence (G, 'int8') ;
assert (isequal (GrB.type (E1), 'int8')) ;
E1 = double (E1) ;
E1 = sortrows (E1')' ;
assert (isequal (E0, E1)) ;
W = W+W' ;
A = graph (W) ;
G = GrB (W) ;
E0 = incidence (A) ;
E1 = GrB.incidence (G, 'upper') ;
E0 = sortrows (E0')' ;
E1 = double (E1) ;
E1 = sortrows (E1')' ;
assert (isequal (E0, E1)) ;
E1 = GrB.incidence (G, 'lower') ;
E1 = -E1 ;
E1 = double (E1) ;
E1 = sortrows (E1')' ;
assert (isequal (E0, E1)) ;
end
fprintf ('gbtest63: all tests passed\n') ;
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