Add graph references

references/igraph-1.0.1/examples/simple/igraph_cocitation.c

@@ -0,0 +1,50 @@
+/*
+   igraph library.
+   Copyright (C) 2006-2020  The igraph development team <igraph@igraph.org>
+
+   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, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <igraph.h>
+#include <stdio.h>
+
+int main(void) {
+    igraph_t graph;
+    igraph_matrix_t matrix;
+
+    /* Initialize the library. */
+    igraph_setup();
+
+    /* Create a small test graph. */
+    igraph_small(&graph, 0, IGRAPH_DIRECTED,
+                 0, 1, 2, 1, 2, 0, 3, 0,
+                 -1);
+
+    /* As usual with igraph functions, the data structure in which the result
+       will be returned must be initialized in advance. */
+    igraph_matrix_init(&matrix, 0, 0);
+    igraph_bibcoupling(&graph, &matrix, igraph_vss_all());
+    printf("Bibliographic coupling matrix:\n");
+    igraph_matrix_print(&matrix);
+
+    igraph_cocitation(&graph, &matrix, igraph_vss_all());
+    printf("\nCocitation matrix:\n");
+    igraph_matrix_print(&matrix);
+
+    /* Destroy data structures when we are done with them. */
+    igraph_matrix_destroy(&matrix);
+    igraph_destroy(&graph);
+
+    return 0;
+}