1function test55b
2%TEST55B test GrB_assign, illustrate duplicate indices, MATLAB vs GraphBLAS
3
4% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2021, All Rights Reserved.
5% SPDX-License-Identifier: Apache-2.0
6
7% MATLAB and GraphBLAS differ on how repeated indices are handled
8%
9% MATLAB: last value, no accumulation
10% GraphBLAS: not defined, SuiteSparse:GraphBLAS accumulates
11
12A = magic (5)
13
14A ([2 2], [4 5])
15
16B = [1000 800 ; 60000 2000 ]
17% B (1,1) = nan
18
19i = [2 2]
20j = [4 5]
21
22C1 = A ;
23C1 ([2 2], [4 5]) = A ([2 2], [4 5]) + B
24
25a = sparse (A)
26b = sparse (B)
27i0 = uint64 (i-1)
28j0 = uint64 (j-1)
29
30C2 = GB_mex_assign (a, [], 'plus', b, i0, j0)
31
32C1
33full (C2.matrix)
34
35c = sparse ([ 1 2 3 4 5 ])
36i = uint64 (0)
37j = uint64 ([ 0 0 4 ])
38a = sparse ([ 10 100 1000])
39e = GB_mex_assign (c, [], 'plus', a, i, j)
40e = full (e.matrix)
41
42ac = accumarray (double (j+1)', full(a)')'
43e2 = c ;
44e2 (i+1, :) = e2 (i+1, :) + ac
45e2 = full (e2)
46
47e2 = c ;
48e2 (i+1,j+1) = e2 (i+1,j+1) + a
49e2 = full (e2)
50
51a = sparse ([ 1000 1000 1000])
52e = GB_mex_assign (c, [], 'plus', a, i, j)
53e = full (e.matrix)
54
55e2 = c ;
56e2 (i+1,j+1) = e2 (i+1,j+1) + a
57e2 = full (e2)
58
59
60e2 = c ;
61e2 (i+1,j+1) = e2 (i+1,j+1) + 1000
62e2 = full (e2)
63
64
65a = sparse ([ 1000 1000 1000])
66e = GB_mex_assign (c, [], '', a, i, j)
67e = full (e.matrix)
68
69e2 = c ;
70e2 (i+1,j+1) = a
71e2 = full (e2)
72
73e2 = c ;
74e2 (i+1,j+1) = 1000
75e2 = full (e2)
76
77fprintf ('\ntest55b: all tests passed\n') ;
78
79
80