Add graph references

references/igraph-1.0.1/examples/simple/igraph_sparsemat7.c

@@ -0,0 +1,78 @@
+/*
+   igraph library.
+   Copyright (C) 2010-2012  Gabor Csardi <csardi.gabor@gmail.com>
+   334 Harvard st, Cambridge MA, 02139 USA
+
+   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>
+
+#define DIM1 10
+#define DIM2 5
+
+#define RANDINT(a) (igraph_rng_get_integer(igraph_rng_default(), 0, (a)))
+
+int main(void) {
+    igraph_matrix_t mat;
+    igraph_sparsemat_t spmat, spmat2;
+    igraph_real_t m1, m2;
+
+    /* Initialize the library. */
+    igraph_setup();
+
+    igraph_rng_seed(igraph_rng_default(), 42);
+
+    igraph_sparsemat_init(&spmat, DIM1, DIM2, 20);
+    igraph_sparsemat_entry(&spmat, 1, 2, -1.0);
+    igraph_sparsemat_entry(&spmat, 3, 2, 10.0);
+    for (int i = 0; i < 10; i++) {
+        igraph_sparsemat_entry(&spmat, RANDINT(DIM1 - 1), RANDINT(DIM2 - 1), 1.0);
+    }
+    igraph_sparsemat_entry(&spmat, 1, 2, -1.0);
+    igraph_sparsemat_entry(&spmat, 3, 2, 10.0);
+
+    igraph_sparsemat_compress(&spmat, &spmat2);
+    igraph_matrix_init(&mat, 0, 0);
+    igraph_sparsemat_as_matrix(&mat, &spmat2);
+    m1 = igraph_sparsemat_min(&spmat2);
+    m2 = igraph_matrix_min(&mat);
+    if (m1 != m2) {
+        printf("%f %f\n", m1, m2);
+        return 1;
+    }
+    m1 = igraph_sparsemat_max(&spmat2);
+    m2 = igraph_matrix_max(&mat);
+    if (m1 != m2) {
+        printf("%f %f\n", m1, m2);
+        return 2;
+    }
+
+    igraph_sparsemat_minmax(&spmat2, &m1, &m2);
+    if (m1 != igraph_matrix_min(&mat)) {
+        return 3;
+    }
+    if (m2 != igraph_matrix_max(&mat)) {
+        return 4;
+    }
+
+    igraph_matrix_destroy(&mat);
+    igraph_sparsemat_destroy(&spmat);
+    igraph_sparsemat_destroy(&spmat2);
+
+    return 0;
+}