/* -*- mode: C -*- */ /* IGraph library. Copyright (C) 2011-2012 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> int comp(void *extra, const void *a, const void *b) { igraph_vector_t *v=(igraph_vector_t*) extra; int *aa=(int*) a; int *bb=(int*) b; igraph_real_t aaa=VECTOR(*v)[*aa]; igraph_real_t bbb=VECTOR(*v)[*bb]; if (aaa < bbb) { return -1; } else if (aaa > bbb) { return 1; } return 0; } int main() { const int len=100; igraph_vector_t v; igraph_vector_int_t idx; int i; igraph_rng_seed(igraph_rng_default(), 42); igraph_vector_init(&v, len); igraph_vector_int_init(&idx, len); for (i=0; i<len; i++) { VECTOR(v)[i] = i; VECTOR(idx)[i] = i; } igraph_vector_shuffle(&v); igraph_qsort_r(VECTOR(idx), len, sizeof(VECTOR(idx)[0]), (void*) &v, comp); for (i=0; i<len; i++) { printf("%g ", VECTOR(v)[ VECTOR(idx)[i] ]); } printf("\n"); igraph_vector_int_destroy(&idx); igraph_vector_destroy(&v); return 0; }