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 +1,69 @@
+/*
+   igraph library.
+   Copyright (C) 2008-2022  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>
+
+int main(void) {
+
+    igraph_t graph;
+    igraph_real_t weights_data[] = { 0, 2, 1, 0, 5, 2, 1, 1, 0, 2, 2, 8, 1, 1, 3, 1, 1, 4, 2, 1 };
+    const igraph_vector_t weights =
+        igraph_vector_view(weights_data, sizeof(weights_data) / sizeof(weights_data[0]));
+    igraph_matrix_t res;
+    igraph_real_t cutoff;
+
+    /* Initialize the library. */
+    igraph_setup();
+
+    igraph_small(&graph, 10, IGRAPH_DIRECTED,
+                 0, 1, 0, 2, 0, 3,    1, 2, 1, 4, 1, 5,
+                 2, 3, 2, 6,          3, 2, 3, 6,
+                 4, 5, 4, 7,          5, 6, 5, 8, 5, 9,
+                 7, 5, 7, 8,          8, 9,
+                 5, 2,
+                 2, 1,
+                 -1);
+
+    igraph_matrix_init(&res, 0, 0);
+
+    printf("Unweighted distances:\n\n");
+
+    igraph_distances(&graph, NULL, &res, igraph_vss_all(), igraph_vss_all(), IGRAPH_OUT);
+    igraph_matrix_print(&res);
+
+    cutoff = 3; /* distances longer than this will be returned as infinity */
+    printf("\nUnweighted distances with a cutoff of %g:\n\n", cutoff);
+    igraph_distances_cutoff(&graph, NULL, &res, igraph_vss_all(), igraph_vss_all(), IGRAPH_OUT, cutoff);
+    igraph_matrix_print(&res);
+
+    printf("\nWeighted distances:\n\n");
+
+    igraph_distances(&graph, &weights, &res, igraph_vss_all(), igraph_vss_all(), IGRAPH_OUT);
+    igraph_matrix_print(&res);
+
+    cutoff = 8; /* distances longer than this will be returned as infinity */
+    printf("\nWeighted distances with a cutoff of %g:\n\n", cutoff);
+    igraph_distances_cutoff(&graph, &weights, &res, igraph_vss_all(), igraph_vss_all(), IGRAPH_OUT, cutoff);
+    igraph_matrix_print(&res);
+
+    igraph_matrix_destroy(&res);
+    igraph_destroy(&graph);
+
+    return 0;
+}