1 /* -*- mode: C -*- */
2 /*
3 IGraph library.
4 Copyright (C) 2011-2012 Gabor Csardi <csardi.gabor@gmail.com>
5 334 Harvard st, Cambridge MA, 02139 USA
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 02110-1301 USA
21
22 */
23
24 #include <igraph.h>
25
main()26 int main() {
27
28 igraph_t g;
29 igraph_vector_t ev;
30 igraph_t scg_graph;
31 igraph_matrix_t scg_matrix;
32 igraph_sparsemat_t scg_sparsemat;
33 igraph_matrix_t L, R;
34 igraph_sparsemat_t Lsparse, Rsparse;
35 igraph_matrix_t input_matrix;
36 igraph_vector_t groups;
37 igraph_vector_t eval;
38 igraph_matrix_t evec;
39
40 igraph_tree(&g, 10, /* children= */ 3, IGRAPH_TREE_UNDIRECTED);
41
42 igraph_vector_init(&ev, 1);
43 igraph_matrix_init(&L, 0, 0);
44 igraph_matrix_init(&R, 0, 0);
45 igraph_matrix_init(&scg_matrix, 0, 0);
46 igraph_vector_init(&groups, 0);
47 igraph_vector_init(&eval, 0);
48 igraph_matrix_init(&evec, 0, 0);
49
50 #define CALLSYM(algo) do { \
51 igraph_vector_clear(&eval); \
52 igraph_matrix_resize(&evec, 0, 0); \
53 igraph_scg_adjacency(&g, /*matrix=*/ 0, /*sparsemat=*/ 0, &ev, \
54 /* intervals= */ 3, /* intervals_vector= */ 0, \
55 /* algorithm= */ algo, &eval, &evec, \
56 /* groups= */ &groups, /* use_arpack= */ 0, \
57 /* maxiter= */ 0, &scg_graph, &scg_matrix, \
58 &scg_sparsemat, &L, &R, \
59 &Lsparse, &Rsparse); } while(0)
60
61
62 #define PRINTRES() \
63 do { \
64 printf("------------------------------------\n"); \
65 igraph_write_graph_edgelist(&scg_graph, stdout); \
66 printf("---\n"); \
67 igraph_vector_print(&groups); \
68 printf("---\n"); \
69 igraph_vector_print(&eval); \
70 igraph_matrix_print(&evec); \
71 printf("---\n"); \
72 igraph_sparsemat_print(&scg_sparsemat, stdout); \
73 printf("---\n"); \
74 igraph_sparsemat_print(&Lsparse, stdout); \
75 printf("---\n"); \
76 igraph_sparsemat_print(&Rsparse, stdout); \
77 printf("---\n"); \
78 } while (0)
79
80 VECTOR(ev)[0] = 1;
81 CALLSYM(IGRAPH_SCG_EXACT);
82 PRINTRES();
83 igraph_destroy(&scg_graph);
84 igraph_sparsemat_destroy(&scg_sparsemat);
85 igraph_sparsemat_destroy(&Lsparse);
86 igraph_sparsemat_destroy(&Rsparse);
87
88 VECTOR(ev)[0] = 3;
89 CALLSYM(IGRAPH_SCG_EXACT);
90 PRINTRES();
91 igraph_destroy(&scg_graph);
92 igraph_sparsemat_destroy(&scg_sparsemat);
93 igraph_sparsemat_destroy(&Lsparse);
94 igraph_sparsemat_destroy(&Rsparse);
95
96 igraph_vector_resize(&ev, 2);
97 VECTOR(ev)[0] = 1;
98 VECTOR(ev)[1] = 3;
99 CALLSYM(IGRAPH_SCG_EXACT);
100 PRINTRES();
101 igraph_destroy(&scg_graph);
102 igraph_sparsemat_destroy(&scg_sparsemat);
103 igraph_sparsemat_destroy(&Lsparse);
104 igraph_sparsemat_destroy(&Rsparse);
105
106 #define CALLSYM2(algo) do { \
107 igraph_vector_clear(&eval); \
108 igraph_matrix_resize(&evec, 0, 0); \
109 igraph_scg_adjacency(/* graph=*/ 0, &input_matrix, /*sparsemat=*/ 0, \
110 &ev, /* intervals= */ 3, \
111 /* intervals_vector= */ 0, \
112 /* algorithm= */ algo, &eval, &evec, \
113 /* groups= */ &groups, /* use_arpack= */ 0, \
114 /* maxiter= */ 0, &scg_graph, &scg_matrix, \
115 &scg_sparsemat, &L, &R, \
116 &Lsparse, &Rsparse); } while (0)
117
118 igraph_matrix_init(&input_matrix, 0, 0);
119 igraph_get_adjacency(&g, &input_matrix, IGRAPH_GET_ADJACENCY_BOTH,
120 /* eids= */ 0);
121
122 igraph_vector_resize(&ev, 1);
123 VECTOR(ev)[0] = 1;
124 CALLSYM2(IGRAPH_SCG_EXACT);
125 PRINTRES();
126 igraph_destroy(&scg_graph);
127 igraph_sparsemat_destroy(&scg_sparsemat);
128 igraph_sparsemat_destroy(&Lsparse);
129 igraph_sparsemat_destroy(&Rsparse);
130
131 VECTOR(ev)[0] = 3;
132 CALLSYM2(IGRAPH_SCG_EXACT);
133 PRINTRES();
134 igraph_destroy(&scg_graph);
135 igraph_sparsemat_destroy(&scg_sparsemat);
136 igraph_sparsemat_destroy(&Lsparse);
137 igraph_sparsemat_destroy(&Rsparse);
138
139 igraph_vector_resize(&ev, 2);
140 VECTOR(ev)[0] = 1;
141 VECTOR(ev)[1] = 3;
142 CALLSYM2(IGRAPH_SCG_EXACT);
143 PRINTRES();
144 igraph_destroy(&scg_graph);
145 igraph_sparsemat_destroy(&scg_sparsemat);
146 igraph_sparsemat_destroy(&Lsparse);
147 igraph_sparsemat_destroy(&Rsparse);
148
149 igraph_matrix_destroy(&evec);
150 igraph_vector_destroy(&eval);
151 igraph_vector_destroy(&groups);
152 igraph_matrix_destroy(&input_matrix);
153 igraph_matrix_destroy(&scg_matrix);
154 igraph_matrix_destroy(&L);
155 igraph_matrix_destroy(&R);
156 igraph_vector_destroy(&ev);
157 igraph_destroy(&g);
158
159 /* -------------------------------------------------------------------- */
160
161 return 0;
162 }
163