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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 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>
typedef struct cb2_data_t {
igraph_matrix_t *A;
} cb2_data_t;
int cb2(igraph_real_t *to, const igraph_real_t *from, int n, void *extra) {
cb2_data_t *data=(cb2_data_t*) extra;
igraph_blas_dgemv_array(/*transpose=*/ 0, /*alpha=*/ 1.0,
data->A, from, /*beta=*/ 0.0, to);
return 0;
}
#define DIM 10
int main() {
igraph_matrix_t A;
igraph_matrix_t values, vectors;
igraph_arpack_options_t options;
cb2_data_t data = { &A };
int i, j;
igraph_rng_seed(igraph_rng_default(), 42 * 42);
igraph_matrix_init(&A, DIM, DIM);
for (i=0; i<DIM; i++) {
for (j=0; j<DIM; j++) {
MATRIX(A, i, j) = igraph_rng_get_integer(igraph_rng_default(), -10, 10);
}
}
igraph_arpack_options_init(&options);
options.n=DIM;
options.start=0;
options.nev=4;
options.ncv=9;
options.which[0]='L' ; options.which[1]='M';
igraph_matrix_init(&values, 0, 0);
igraph_matrix_init(&vectors, options.n, 1);
igraph_arpack_rnsolve(cb2, /*extra=*/ &data, &options, /*storage=*/ 0,
&values, &vectors);
while (options.nev < igraph_matrix_nrow(&values)) {
igraph_matrix_remove_row(&values, igraph_matrix_nrow(&values)-1);
}
if (MATRIX(values, 2, 1) > 0) {
MATRIX(values, 2, 1) = -MATRIX(values, 2, 1);
MATRIX(values, 3, 1) = -MATRIX(values, 3, 1);
}
igraph_matrix_print(&values);
printf("---\n");
igraph_matrix_print(&vectors);
printf("---\n");
/* -------------- */
options.nev=3;
options.which[0]='L' ; options.which[1]='M';
igraph_arpack_rnsolve(cb2, /*extra=*/ &data, &options, /*storage=*/ 0,
&values, &vectors);
while (options.nev < igraph_matrix_nrow(&values)) {
igraph_matrix_remove_row(&values, igraph_matrix_nrow(&values)-1);
}
if (MATRIX(values, 2, 1) > 0) {
MATRIX(values, 2, 1) = -MATRIX(values, 2, 1);
}
igraph_matrix_print(&values);
printf("---\n");
igraph_matrix_print(&vectors);
printf("---\n");
/* -------------- */
options.nev=3;
options.which[0]='S' ; options.which[1]='R';
igraph_arpack_rnsolve(cb2, /*extra=*/ &data, &options, /*storage=*/ 0,
&values, &vectors);
while (options.nev < igraph_matrix_nrow(&values)) {
igraph_matrix_remove_row(&values, igraph_matrix_nrow(&values)-1);
}
igraph_matrix_print(&values);
printf("---\n");
igraph_matrix_print(&vectors);
printf("---\n");
/* -------------- */
options.nev=3;
options.which[0]='L' ; options.which[1]='I';
igraph_arpack_rnsolve(cb2, /*extra=*/ &data, &options, /*storage=*/ 0,
&values, &vectors);
while (options.nev < igraph_matrix_nrow(&values)) {
igraph_matrix_remove_row(&values, igraph_matrix_nrow(&values)-1);
}
igraph_matrix_print(&values);
printf("---\n");
igraph_matrix_print(&vectors);
printf("---\n");
/* -------------- */
igraph_matrix_destroy(&values);
igraph_matrix_destroy(&vectors);
igraph_matrix_destroy(&A);
return 0;
}
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