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#include <igraph.h>
int main(void) {
igraph_t graph;
igraph_strvector_t names;
igraph_vector_t weights;
igraph_integer_t i;
igraph_integer_t vcount, ecount;
igraph_set_attribute_table(&igraph_cattribute_table);
igraph_small(&graph, 7, IGRAPH_UNDIRECTED,
0,1, 1,3, 1,2, 2,0, 4,2, 3,4,
-1);
vcount = igraph_vcount(&graph);
ecount = igraph_ecount(&graph);
printf("Output without isolates:\n");
igraph_write_graph_lgl(&graph, stdout, /*names*/ NULL, /*weights*/ NULL, /*isolates*/ 0);
printf("\nOutput with isolates:\n");
igraph_write_graph_lgl(&graph, stdout, /*names*/ NULL, /*weights*/ NULL, /*isolates*/ 1);
printf("\nOutput vertex and edge labels:\n");
igraph_strvector_init(&names, vcount);
for (i = 0; i < vcount; i++) {
char str[2] = " "; /* initialize to ensure presence of null terminator */
str[0] = 'A' + i;
igraph_strvector_set(&names, i, str);
}
SETVASV(&graph, "names", &names);
igraph_vector_init_range(&weights, 1, ecount + 1);
SETEANV(&graph, "weights", &weights);
igraph_write_graph_lgl(&graph, stdout, "names", "weights", /*isolates*/ 0);
igraph_strvector_destroy(&names);
igraph_vector_destroy(&weights);
igraph_destroy(&graph);
return 0;
}
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