int main() {
igraph_t g;
int ret;
igraph_atlas(&g, 45);
igraph_write_graph_edgelist(&g, stdout);
printf("\n");
igraph_destroy(&g);
igraph_atlas(&g, 0);
igraph_write_graph_edgelist(&g, stdout);
printf("\n");
igraph_destroy(&g);
igraph_atlas(&g, 1252);
igraph_write_graph_edgelist(&g, stdout);
printf("\n");
igraph_destroy(&g);
igraph_set_error_handler(igraph_error_handler_ignore);
ret=igraph_atlas(&g, -1);
if (ret != IGRAPH_EINVAL) {
return 1;
}
ret=igraph_atlas(&g, 1253);
if (ret != IGRAPH_EINVAL) {
return 2;
}
return 0;
}
int main() {
const char *files[] = { "fullmatrix1.dl", "fullmatrix2.dl",
"fullmatrix3.dl", "fullmatrix4.dl",
"edgelist1.dl", "edgelist2.dl", "edgelist3.dl",
"edgelist4.dl", "edgelist5.dl", "edgelist6.dl",
"nodelist1.dl", "nodelist2.dl" };
int no_files=sizeof(files)/sizeof(const char*);
int i, ret;
igraph_t g;
FILE *infile;
for (i=0; i<no_files; i++) {
printf("Doing %s\n", files[i]);
infile=fopen(files[i], "r");
if (!infile) {
printf("Cannot open file: %s\n", files[i]);
exit(1+i);
}
igraph_read_graph_dl(&g, infile, /*directed=*/ 1);
ret=fclose(infile);
if (ret) {
printf("Cannot close file: %s\n", files[i]);
exit(11+i);
}
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
}
if (IGRAPH_FINALLY_STACK_SIZE() != 0)
return 1;
return 0;
}
void dump_graph(const char* header, const igraph_t* g) {
fputs(header, stdout);
printf("Vertices: %li\n", (long int) igraph_vcount(g));
printf("Edges: %li\n", (long int) igraph_ecount(g));
printf("Directed: %i\n", (int) igraph_is_directed(g));
igraph_write_graph_edgelist(g, stdout);
}
int main() {
igraph_t g;
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,1, 1,2, 2,3, 3,4, 6,1, -1);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
return 0;
}
int check_lattice(const lat_test_t *test) {
igraph_t graph, othergraph;
igraph_vector_t otheredges;
igraph_vector_t dimvector;
igraph_bool_t iso;
int ret;
/* Create lattice */
igraph_vector_view(&dimvector, test->dimedges, test->dim);
igraph_lattice(&graph, &dimvector, test->nei, test->directed,
test->mutual, test->circular);
/* Check its properties */
if ((ret=check_lattice_properties(&graph, &dimvector, test->directed,
test->mutual, test->circular))) {
igraph_destroy(&graph);
printf("Lattice properties are not satisfied\n");
return ret;
}
/* Check that it is isomorphic to the stored graph */
igraph_vector_view(&otheredges, test->dimedges+test->dim, test->m * 2);
igraph_create(&othergraph, &otheredges, igraph_vector_prod(&dimvector),
test->directed);
igraph_isomorphic(&graph, &othergraph, &iso);
if (!iso) {
printf("--\n");
igraph_write_graph_edgelist(&graph, stdout);
printf("--\n");
igraph_write_graph_edgelist(&othergraph, stdout);
igraph_destroy(&graph);
igraph_destroy(&othergraph);
return 50;
}
igraph_destroy(&graph);
igraph_destroy(&othergraph);
return 0;
}
int main() {
igraph_t g, tree;
igraph_vector_t eb, edges;
long int i;
igraph_small(&g, 0, IGRAPH_UNDIRECTED,
0, 1, 0, 2, 0, 3, 0, 4, 0, 5,
0, 6, 0, 7, 0, 8, 0, 10, 0, 11,
0, 12, 0, 13, 0, 17, 0, 19, 0, 21,
0, 31, 1, 2, 1, 3, 1, 7, 1, 13,
1, 17, 1, 19, 1, 21, 1, 30, 2, 3,
2, 7, 2, 8, 2, 9, 2, 13, 2, 27,
2, 28, 2, 32, 3, 7, 3, 12, 3, 13,
4, 6, 4, 10, 5, 6, 5, 10, 5, 16,
6, 16, 8, 30, 8, 32, 8, 33, 9, 33,
13, 33, 14, 32, 14, 33, 15, 32, 15, 33,
18, 32, 18, 33, 19, 33, 20, 32, 20, 33,
22, 32, 22, 33, 23, 25, 23, 27, 23, 29,
23, 32, 23, 33, 24, 25, 24, 27, 24, 31,
25, 31, 26, 29, 26, 33, 27, 33, 28, 31,
28, 33, 29, 32, 29, 33, 30, 32, 30, 33,
31, 32, 31, 33, 32, 33,
-1);
igraph_vector_init(&eb, igraph_ecount(&g));
igraph_edge_betweenness(&g, &eb, IGRAPH_UNDIRECTED, /*weights=*/ 0);
for (i=0; i<igraph_vector_size(&eb); i++) {
VECTOR(eb)[i] = -VECTOR(eb)[i];
}
igraph_minimum_spanning_tree_prim(&g, &tree, &eb);
igraph_write_graph_edgelist(&tree, stdout);
igraph_vector_init(&edges, 0);
igraph_minimum_spanning_tree(&g, &edges, &eb);
igraph_vector_print(&edges);
igraph_vector_destroy(&edges);
igraph_destroy(&tree);
igraph_destroy(&g);
igraph_vector_destroy(&eb);
return 0;
}
int main(int argc, char **argv) {
igraph_t g;
FILE *ifile;
/* PAJEK */
ifile=fopen("LINKS.NET", "r");
if (ifile==0) {
return 10;
}
igraph_read_graph_pajek(&g, ifile);
fclose(ifile);
printf("The graph:\n");
printf("Vertices: %li\n", (long int) igraph_vcount(&g));
printf("Edges: %li\n", (long int) igraph_ecount(&g));
printf("Directed: %i\n", (int) igraph_is_directed(&g));
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
return 0;
}
int main() {
igraph_t g;
/* Multiple edges */
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,1, 0,1, 0,1, 0,1, 0,1, -1);
igraph_simplify(&g, 1, 1);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_UNDIRECTED, 1,0, 0,1, 1,0, 0,1, 0,1, -1);
igraph_simplify(&g, 1, 1);
if (igraph_ecount(&g) != 1) {
return 1;
}
igraph_destroy(&g);
/* Loop edges*/
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,0,1,1,2,2, 1,2, -1);
igraph_simplify(&g, 1, 1);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_UNDIRECTED, 0,0,1,1,2,2, 1,2, -1);
igraph_simplify(&g, 1, 1);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
/* Loop & multiple edges */
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,0,0,0,0,0,0,0, 1,2, -1);
igraph_simplify(&g, 1 /* multiple */, 0 /* loop */);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_UNDIRECTED, 1,1,1,1,1,1,1,1, 2,3, -1);
igraph_simplify(&g, 1 /* multiple */, 0 /* loop */);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_DIRECTED, 2,2,2,2,2,2, 3,2, -1);
igraph_simplify(&g, 0 /* multiple */, 1 /* loop */);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_UNDIRECTED, 3,3,3,3, 3,4, -1);
igraph_simplify(&g, 0 /* multiple */, 1 /* loop */);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_DIRECTED, 2,2,2,2,2,2,2,2, 3,2,3,2,3,2,3,2,3,2,-1);
igraph_simplify(&g, 1, 1);
igraph_write_graph_edgelist(&g, stdout);
igraph_destroy(&g);
igraph_small(&g, 0, IGRAPH_UNDIRECTED,
2,2,2,2,2,2,2,2, 3,2,2,3,3,2,3,2,3,2,-1);
igraph_simplify(&g, 1, 1);
if (igraph_ecount(&g) != 1) {
return 2;
}
igraph_destroy(&g);
return 0;
}
void write_edgelist(FILE* outstream, const Graph& graph) {
IGRAPH_TRY(igraph_write_graph_edgelist(graph.c_graph(), outstream));
}