Add graph references

2026-06-28 13:49:01 +01:00
parent 0a9807e448
commit a11edf0c53
2578 changed files with 868045 additions and 0 deletions
@@ -0,0 +1,84 @@
+/*
+   igraph library.
+   Copyright (C) 2010-2021  The igraph development team
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301 USA
+
+*/
+
+#include <igraph.h>
+
+static void simplify_write_destroy(igraph_t *g, igraph_attribute_combination_t *comb) {
+    igraph_simplify(g, /*remove_multiple=*/ true, /*remove_loops=*/ true, comb);
+    igraph_write_graph_graphml(g, stdout, /*prefixattr=*/ true);
+    igraph_attribute_combination_destroy(comb);
+    igraph_destroy(g);
+}
+
+int main(void) {
+
+    igraph_t g, g2;
+    igraph_attribute_combination_t comb;
+
+    /* Initialize the library. */
+    igraph_setup();
+
+    igraph_set_attribute_table(&igraph_cattribute_table);
+
+    igraph_small(&g, 4, IGRAPH_DIRECTED,
+                 0, 1, 0, 1, 0, 1,
+                 1, 2, 2, 3,
+                 -1);
+
+    SETEAS(&g, "color", 0, "green");
+    SETEAS(&g, "color", 1, "red");
+    SETEAS(&g, "color", 2, "blue");
+    SETEAS(&g, "color", 3, "white");
+    SETEAS(&g, "color", 4, "black");
+
+    /* ****************************************************** */
+
+    igraph_copy(&g2, &g);
+    igraph_attribute_combination(&comb,
+                                 "weight", IGRAPH_ATTRIBUTE_COMBINE_SUM,
+                                 "color",  IGRAPH_ATTRIBUTE_COMBINE_FIRST,
+                                 "",       IGRAPH_ATTRIBUTE_COMBINE_IGNORE,
+                                 IGRAPH_NO_MORE_ATTRIBUTES);
+    simplify_write_destroy(&g2, &comb);
+
+    /* ****************************************************** */
+
+    igraph_copy(&g2, &g);
+    igraph_attribute_combination(&comb,
+                                 "",       IGRAPH_ATTRIBUTE_COMBINE_LAST,
+                                 IGRAPH_NO_MORE_ATTRIBUTES);
+    simplify_write_destroy(&g2, &comb);
+
+    /* ****************************************************** */
+
+    igraph_copy(&g2, &g);
+    igraph_attribute_combination(&comb,
+                                 "",       IGRAPH_ATTRIBUTE_COMBINE_IGNORE,
+                                 "color",  IGRAPH_ATTRIBUTE_COMBINE_CONCAT,
+                                 IGRAPH_NO_MORE_ATTRIBUTES);
+    simplify_write_destroy(&g2, &comb);
+
+    /* ****************************************************** */
+
+    igraph_destroy(&g);
+
+    return 0;
+}