int main() {
igraph_matrix_t A;
igraph_vector_t values;
igraph_matrix_t vectors;
int i, j;
igraph_eigen_which_t which;
igraph_rng_seed(igraph_rng_default(), 42 * 42);
igraph_matrix_init(&A, DIM, DIM);
igraph_matrix_init(&vectors, 0, 0);
igraph_vector_init(&values, 0);
/* All eigenvalues and eigenvectors */
for (i=0; i<DIM; i++) {
for (j=i; j<DIM; j++) {
MATRIX(A, i, j) = MATRIX(A, j, i) =
igraph_rng_get_integer(igraph_rng_default(), 1, 10);
}
}
which.pos=IGRAPH_EIGEN_LM;
which.howmany=5;
igraph_eigen_matrix_symmetric(&A, /*sA=*/ 0, /*fun=*/ 0, DIM, /*extra=*/ 0,
IGRAPH_EIGEN_LAPACK, &which, /*options=*/ 0,
/*storage=*/ 0, &values, &vectors);
igraph_vector_print(&values);
check_ev(&A, &values, &vectors);
which.howmany=8;
igraph_eigen_matrix_symmetric(&A, /*sA=*/ 0, /*fun=*/ 0, DIM, /*extra=*/ 0,
IGRAPH_EIGEN_LAPACK, &which, /*options=*/ 0,
/*storage=*/ 0, &values, &vectors);
igraph_vector_print(&values);
check_ev(&A, &values, &vectors);
which.pos=IGRAPH_EIGEN_BE;
which.howmany=5;
igraph_eigen_matrix_symmetric(&A, /*sA=*/ 0, /*fun=*/ 0, DIM, /*extra=*/ 0,
IGRAPH_EIGEN_LAPACK, &which, /*options=*/ 0,
/*storage=*/ 0, &values, &vectors);
igraph_vector_print(&values);
check_ev(&A, &values, &vectors);
which.pos=IGRAPH_EIGEN_SM;
which.howmany=5;
igraph_eigen_matrix_symmetric(&A, /*sA=*/ 0, /*fun=*/ 0, DIM, /*extra=*/ 0,
IGRAPH_EIGEN_LAPACK, &which, /*options=*/ 0,
/*storage=*/ 0, &values, &vectors);
igraph_vector_print(&values);
check_ev(&A, &values, &vectors);
igraph_vector_destroy(&values);
igraph_matrix_destroy(&vectors);
igraph_matrix_destroy(&A);
return 0;
}
int main() {
igraph_t small, big;
igraph_matrix_t small_coords, big_coords, merged_coords;
igraph_vector_ptr_t graph_ptr, coords_ptr;
igraph_arpack_options_t arpack_opts;
/* To make things reproducible */
igraph_rng_seed(igraph_rng_default(), 42);
igraph_small(&big, 10, IGRAPH_UNDIRECTED,
0,1, 1,2, 2,3, 3,4, 4,5, 5,6, 6,7, 7,8, 8,9, 9,0,
-1);
igraph_small(&small, 3, IGRAPH_UNDIRECTED,
0,1, 1,2, 2,0,
-1);
igraph_arpack_options_init(&arpack_opts);
igraph_matrix_init(&big_coords, 0, 0);
igraph_layout_mds(&big, &big_coords, /*dist=*/ 0, /*dim=*/ 2,
&arpack_opts);
igraph_matrix_init(&small_coords, 0, 0);
igraph_layout_mds(&small, &small_coords, /*dist=*/ 0, /*dim=*/ 2,
&arpack_opts);
igraph_vector_ptr_init(&graph_ptr, 2);
igraph_vector_ptr_init(&coords_ptr, 2);
igraph_matrix_init(&merged_coords, 0, 0);
VECTOR(graph_ptr)[0] = &big;
VECTOR(graph_ptr)[1] = &small;
VECTOR(coords_ptr)[0] = &big_coords;
VECTOR(coords_ptr)[1] = &small_coords;
igraph_layout_merge_dla(&graph_ptr, &coords_ptr, &merged_coords);
igraph_matrix_print(&merged_coords);
igraph_matrix_destroy(&merged_coords);
igraph_matrix_destroy(&small_coords);
igraph_matrix_destroy(&big_coords);
igraph_vector_ptr_destroy(&graph_ptr);
igraph_vector_ptr_destroy(&coords_ptr);
igraph_destroy(&small);
igraph_destroy(&big);
#ifdef __APPLE__
return 0;
#else
return 77;
#endif
}
int main () {
long int i;
igraph_matrix_t m;
igraph_real_t x, y, z, r;
srand(time(0));
/* 2D */
igraph_matrix_init(&m, 1000, 2);
for (i=0; i<igraph_matrix_nrow(&m); i++) {
MATRIX(m,i,0)=rand()/(double)RAND_MAX;
MATRIX(m,i,1)=rand()/(double)RAND_MAX;
}
igraph_i_layout_sphere_2d(&m, &x, &y, &r);
for (i=0; i<igraph_matrix_nrow(&m); i++) {
igraph_real_t dist=sqrt((MATRIX(m,i,0)-x)*(MATRIX(m,i,0)-x) +
(MATRIX(m,i,1)-y)*(MATRIX(m,i,1)-y));
if (dist > r) {
printf("x: %f y: %f r: %f\n", x, y, r);
printf("x: %f y: %f dist: %f (%li)\n",
MATRIX(m,i,0), MATRIX(m,i,1), dist, i);
return 1;
}
}
igraph_matrix_destroy(&m);
/* 3D */
igraph_matrix_init(&m, 1000, 3);
for (i=0; i<igraph_matrix_nrow(&m); i++) {
MATRIX(m,i,0)=rand()/(double)RAND_MAX;
MATRIX(m,i,1)=rand()/(double)RAND_MAX;
MATRIX(m,i,2)=rand()/(double)RAND_MAX;
}
igraph_i_layout_sphere_3d(&m, &x, &y, &z, &r);
for (i=0; i<igraph_matrix_nrow(&m); i++) {
igraph_real_t dist=sqrt((MATRIX(m,i,0)-x)*(MATRIX(m,i,0)-x) +
(MATRIX(m,i,1)-y)*(MATRIX(m,i,1)-y) +
(MATRIX(m,i,2)-z)*(MATRIX(m,i,2)-z));
if (dist > r) {
printf("x: %f y: %f z: %f r: %f\n", x, y, z, r);
printf("x: %f y: %f z: %f dist: %f (%li)\n",
MATRIX(m,i,0), MATRIX(m,i,1), MATRIX(m,i,2), dist, i);
return 1;
}
}
igraph_matrix_destroy(&m);
return 0;
}
int main() {
igraph_matrix_t A;
igraph_matrix_t vectors_left, vectors_right;
igraph_vector_t values_real, values_imag;
int i, j;
int info=1;
int ilo, ihi;
igraph_real_t abnrm;
igraph_rng_seed(igraph_rng_default(), 42);
igraph_matrix_init(&A, DIM, DIM);
igraph_matrix_init(&vectors_left, 0, 0);
igraph_matrix_init(&vectors_right, 0, 0);
igraph_vector_init(&values_real, 0);
igraph_vector_init(&values_imag, 0);
for (i=0; i<DIM; i++) {
for (j=0; j<DIM; j++) {
MATRIX(A, i, j) = igraph_rng_get_integer(igraph_rng_default(), 1, 10);
}
}
igraph_lapack_dgeevx(IGRAPH_LAPACK_DGEEVX_BALANCE_BOTH,
&A, &values_real, &values_imag,
&vectors_left, &vectors_right, &ilo, &ihi,
/*scale=*/ 0, &abnrm, /*rconde=*/ 0,
/*rcondv=*/ 0, &info);
if (check_ev(&A, &values_real, &values_imag,
&vectors_left, &vectors_right, /*tol=*/ 1e-8)) {
return 1;
}
/* igraph_matrix_print(&A); */
/* igraph_vector_print(&values_real); */
/* igraph_vector_print(&values_imag); */
/* igraph_matrix_print(&vectors_left); */
/* igraph_matrix_print(&vectors_right); */
igraph_vector_destroy(&values_imag);
igraph_vector_destroy(&values_real);
igraph_matrix_destroy(&vectors_right);
igraph_matrix_destroy(&vectors_left);
igraph_matrix_destroy(&A);
return 0;
}
/* call-seq:
* graph.get_adjacency(type) -> Array
*
* Returns the adjacency matrix of a graph
*
*/
VALUE cIGraph_get_adjacency(VALUE self, VALUE mode){
igraph_t *graph;
igraph_get_adjacency_t pmode = NUM2INT(mode);
igraph_matrix_t res;
int i;
int j;
VALUE row;
VALUE path_length;
VALUE matrix = rb_ary_new();
int n;
Data_Get_Struct(self, igraph_t, graph);
n = igraph_vcount(graph);
//matrix to hold the results of the calculations
igraph_matrix_init(&res,n,n);
igraph_get_adjacency(graph,&res,pmode);
for(i=0; i<igraph_matrix_nrow(&res); i++){
row = rb_ary_new();
rb_ary_push(matrix,row);
for(j=0; j<igraph_matrix_ncol(&res); j++){
path_length = INT2NUM(MATRIX(res,i,j));
rb_ary_push(row,path_length);
}
}
igraph_matrix_destroy(&res);
return matrix;
}
int main() {
const int nodes=10, skip=3;
igraph_matrix_t mat2;
igraph_vector_complex_t values, values2;
igraph_matrix_complex_t vectors, vectors2;
igraph_eigen_which_t which;
int i;
igraph_rng_seed(igraph_rng_default(), 42);
igraph_matrix_init(&mat2, nodes, nodes);
for (i=0; i<nodes; i++) {
int j;
for (j=0; j<nodes; j++) {
MATRIX(mat2, i, j) = igraph_rng_get_integer(igraph_rng_default(), 1, 10);
}
}
igraph_vector_complex_init(&values, 0);
igraph_matrix_complex_init(&vectors, 0, 0);
which.pos=IGRAPH_EIGEN_LI;
which.howmany=nodes;
igraph_eigen_matrix(&mat2, /*sparsemat=*/ 0, /*fun=*/ 0, nodes,
/*extra=*/ 0, IGRAPH_EIGEN_LAPACK, &which,
/*options=*/ 0, /*storage=*/ 0, &values, &vectors);
igraph_vector_complex_init(&values2, 0);
igraph_matrix_complex_init(&vectors2, 0, 0);
which.pos=IGRAPH_EIGEN_SI;
which.howmany=nodes;
igraph_eigen_matrix(&mat2, /*sparsemat=*/ 0, /*fun=*/ 0, nodes,
/*extra=*/ 0, IGRAPH_EIGEN_LAPACK, &which,
/*options=*/ 0, /*storage=*/ 0, &values2, &vectors2);
igraph_vector_complex_print(&values);
igraph_vector_complex_print(&values2);
for (i=0; i<nodes; i++) {
int j;
igraph_real_t d=
igraph_complex_abs(igraph_complex_sub(VECTOR(values)[i],
VECTOR(values2)[nodes-i-1]));
if (d > 1e-15) { DUMP(); return 2; }
for (j=0; j<nodes; j++) {
igraph_real_t d=
igraph_complex_abs(igraph_complex_sub(MATRIX(vectors, j, i),
MATRIX(vectors2, j,
nodes-i-1)));
if (d > 1e-15) { DUMP(); return 3; }
}
}
igraph_vector_complex_destroy(&values);
igraph_matrix_complex_destroy(&vectors);
igraph_vector_complex_destroy(&values2);
igraph_matrix_complex_destroy(&vectors2);
igraph_matrix_destroy(&mat2);
return 0;
}
VALUE cIGraph_community_fastgreedy(VALUE self){
igraph_t *graph;
igraph_vector_t modularity;
igraph_matrix_t *merges = malloc(sizeof(igraph_matrix_t));
int i;
VALUE modularity_a, res;
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(merges,0,0);
igraph_vector_init(&modularity,0);
igraph_community_fastgreedy(graph,NULL,
merges,&modularity);
modularity_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&modularity);i++){
rb_ary_push(modularity_a,rb_float_new(VECTOR(modularity)[i]));
}
res = rb_ary_new3(2,
Data_Wrap_Struct(cIGraphMatrix, 0,
cIGraph_matrix_free, merges),
modularity_a);
igraph_vector_destroy(&modularity);
return res;
}
int initIgraph(int *m){
igraph_t g;
igraph_matrix_t mat;
long int i, j;
igraph_matrix_init(&mat, numNodos, numNodos);
for (i=0; i<numNodos; i++) for (j=0; j<numNodos; j++) MATRIX(mat, i, j) = m[i+numNodos*j];
igraph_i_set_attribute_table(&igraph_cattribute_table);
igraph_weighted_adjacency(&g, &mat, IGRAPH_ADJ_UPPER, 0, /*loops=*/ 1);
//print(&g);
FILE *stp;
stp = fopen("/home/john/git/primAlgorithm/grafo2.gml", "w");
if (stp==0) {
printf("Problema abriendo archivo de grafo\n");
return EXIT_FAILURE;
}
igraph_write_graph_gml(&g, stp, 0, "gml Test");
fclose(stp);
igraph_destroy(&g);
return EXIT_SUCCESS;
}
int igraph_2dgrid_init(igraph_2dgrid_t *grid, igraph_matrix_t *coords,
igraph_real_t minx, igraph_real_t maxx, igraph_real_t deltax,
igraph_real_t miny, igraph_real_t maxy, igraph_real_t deltay) {
long int i;
grid->coords=coords;
grid->minx=minx;
grid->maxx=maxx;
grid->deltax=deltax;
grid->miny=miny;
grid->maxy=maxy;
grid->deltay=deltay;
grid->stepsx=(long int) ceil((maxx-minx)/deltax);
grid->stepsy=(long int) ceil((maxy-miny)/deltay);
IGRAPH_CHECK(igraph_matrix_init(&grid->startidx,
grid->stepsx, grid->stepsy));
IGRAPH_FINALLY(igraph_matrix_destroy, &grid->startidx);
IGRAPH_VECTOR_INIT_FINALLY(&grid->next, igraph_matrix_nrow(coords));
IGRAPH_VECTOR_INIT_FINALLY(&grid->prev, igraph_matrix_nrow(coords));
for (i=0; i<igraph_vector_size(&grid->next); i++) {
VECTOR(grid->next)[i]=-1;
}
grid->massx=0;
grid->massy=0;
grid->vertices=0;
IGRAPH_FINALLY_CLEAN(3);
return 0;
}
int main() {
igraph_t g;
igraph_vector_t weights;
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 };
igraph_matrix_t res;
igraph_small(&g, 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_vector_view(&weights, weights_data,
sizeof(weights_data)/sizeof(igraph_real_t));
igraph_matrix_init(&res, 0, 0);
igraph_shortest_paths_dijkstra(&g, &res, igraph_vss_all(), igraph_vss_all(),
&weights, IGRAPH_OUT);
print_matrix(&res);
igraph_matrix_destroy(&res);
igraph_destroy(&g);
return 0;
}
int test_unnormalized_laplacian(igraph_bool_t dir) {
igraph_t g;
igraph_matrix_t m;
igraph_vector_t vec;
igraph_matrix_init(&m, 1, 1);
/* No loop or multiple edges */
igraph_ring(&g, 5, dir, 0, 1);
igraph_laplacian(&g, &m, 0);
print_matrix(&m);
printf("===\n");
/* Add some loop edges */
igraph_vector_init_real(&vec, 4, 1.0, 1.0, 2.0, 2.0);
igraph_add_edges(&g, &vec, 0);
igraph_vector_destroy(&vec);
igraph_laplacian(&g, &m, 0);
print_matrix(&m);
printf("===\n");
/* Duplicate some edges */
igraph_vector_init_real(&vec, 4, 1.0, 2.0, 3.0, 4.0);
igraph_add_edges(&g, &vec, 0);
igraph_vector_destroy(&vec);
igraph_laplacian(&g, &m, 0);
print_matrix(&m);
igraph_destroy(&g);
igraph_matrix_destroy(&m);
return 0;
}
/* Erdos-Renyi : G(n,M)
*/
igraph_t *ggen_generate_erdos_gnm(gsl_rng *r, unsigned long n, unsigned long m)
{
igraph_matrix_t adj;
igraph_t *g = NULL;
int err;
unsigned long i,j;
unsigned long added_edges = 0;
ggen_error_start_stack();
if(r == NULL)
GGEN_SET_ERRNO(GGEN_EINVAL);
if(m > (n*(n-1)/2))
GGEN_SET_ERRNO(GGEN_EINVAL);
g = malloc(sizeof(igraph_t));
GGEN_CHECK_ALLOC(g);
GGEN_FINALLY3(free,g,1);
if(m == 0 || n <= 1)
{
GGEN_CHECK_IGRAPH(igraph_empty(g,n,1));
goto end;
}
if(m == (n*(n-1))/2)
{
GGEN_CHECK_IGRAPH(igraph_full_citation(g,n,1));
goto end;
}
GGEN_CHECK_IGRAPH(igraph_matrix_init(&adj,n,n));
GGEN_FINALLY(igraph_matrix_destroy,&adj);
igraph_matrix_null(&adj);
while(added_edges < m) {
GGEN_CHECK_GSL_DO(i = gsl_rng_uniform_int(r,n));
GGEN_CHECK_GSL_DO(j = gsl_rng_uniform_int(r,n));
if(i < j && igraph_matrix_e(&adj,i,j) == 0)
{
igraph_matrix_set(&adj,i,j,1);
added_edges++;
}
}
GGEN_CHECK_IGRAPH(igraph_adjacency(g,&adj,IGRAPH_ADJ_DIRECTED));
end:
ggen_error_clean(1);
return g;
ggen_error_label:
return NULL;
}
/* call-seq:
* graph.dijkstra_shortest_paths(varray,weights,mode) -> Array
*
* Calculates the length of the shortest paths from each of the vertices in
* the varray Array to all of the other vertices in the graph given a set of
* edge weights given in the weights Array. The result
* is returned as an Array of Array. Each top-level Array contains the results
* for a vertex in the varray Array. Each entry in the Array is the path length
* to another vertex in the graph in vertex order (the order the vertices were
* added to the graph. (This should probalby be changed to give a Hash of Hash
* to allow easier look up.)
*/
VALUE cIGraph_dijkstra_shortest_paths(VALUE self, VALUE from, VALUE weights, VALUE mode){
igraph_t *graph;
igraph_vs_t vids;
igraph_vector_t vidv;
igraph_vector_t wghts;
igraph_neimode_t pmode = NUM2INT(mode);
igraph_matrix_t res;
int i;
int j;
VALUE row;
VALUE path_length;
VALUE matrix = rb_ary_new();
int n_row;
int n_col;
Data_Get_Struct(self, igraph_t, graph);
n_row = NUM2INT(rb_funcall(from,rb_intern("length"),0));
n_col = igraph_vcount(graph);
//matrix to hold the results of the calculations
igraph_matrix_init(&res,n_row,n_col);
igraph_vector_init(&wghts,RARRAY_LEN(weights));
for(i=0;i<RARRAY_LEN(weights);i++){
VECTOR(wghts)[i] = NUM2DBL(RARRAY_PTR(weights)[i]);
}
//Convert an array of vertices to a vector of vertex ids
igraph_vector_init_int(&vidv,0);
cIGraph_vertex_arr_to_id_vec(self,from,&vidv);
//create vertex selector from the vecotr of ids
igraph_vs_vector(&vids,&vidv);
igraph_dijkstra_shortest_paths(graph,&res,vids,&wghts,pmode);
for(i=0; i<igraph_matrix_nrow(&res); i++){
row = rb_ary_new();
rb_ary_push(matrix,row);
for(j=0; j<igraph_matrix_ncol(&res); j++){
path_length = MATRIX(res,i,j) == n_col ? Qnil : rb_float_new(MATRIX(res,i,j));
rb_ary_push(row,path_length);
}
}
igraph_vector_destroy(&vidv);
igraph_matrix_destroy(&res);
igraph_vs_destroy(&vids);
igraph_vector_destroy(&wghts);
return matrix;
}
VALUE cIGraph_community_edge_betweenness(VALUE self, VALUE directed){
igraph_t *graph;
igraph_vector_t result_vec;
igraph_vector_t edge_betw_vec;
igraph_vector_t bridges_vec;
igraph_matrix_t *merges = malloc(sizeof(igraph_matrix_t));
igraph_bool_t directed_b = 0;
int i;
VALUE result_a, edge_betw_a, bridges_a, res;
if(directed)
directed_b = 1;
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(merges,0,0);
igraph_vector_init(&result_vec,0);
igraph_vector_init(&edge_betw_vec,0);
igraph_vector_init(&bridges_vec,0);
igraph_community_edge_betweenness(graph,
&result_vec,&edge_betw_vec,
merges,&bridges_vec,directed_b);
result_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&result_vec);i++){
rb_ary_push(result_a,INT2NUM(VECTOR(result_vec)[i]));
}
edge_betw_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&edge_betw_vec);i++){
rb_ary_push(edge_betw_a,INT2NUM(VECTOR(edge_betw_vec)[i]));
}
bridges_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&bridges_vec);i++){
rb_ary_push(bridges_a,INT2NUM(VECTOR(bridges_vec)[i]));
}
res = rb_ary_new3(4,
Data_Wrap_Struct(cIGraphMatrix, 0,
cIGraph_matrix_free, merges),
result_a, edge_betw_a, bridges_a);
igraph_vector_destroy(&result_vec);
igraph_vector_destroy(&edge_betw_vec);
igraph_vector_destroy(&bridges_vec);
return res;
}
VALUE cIGraph_community_leading_eigenvector_naive(VALUE self, VALUE steps){
igraph_t *graph;
igraph_vector_t membership;
igraph_matrix_t *merges = malloc(sizeof(igraph_matrix_t));
igraph_arpack_options_t arpack_opt;
igraph_arpack_options_init(&arpack_opt);
int i,groupid,max_groupid;
VALUE groups, group, res;
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(merges,0,0);
igraph_vector_init(&membership,0);
igraph_community_leading_eigenvector_naive(graph,merges,&membership,
NUM2INT(steps), &arpack_opt);
max_groupid = 0;
for(i=0;i<igraph_vector_size(&membership);i++){
if(VECTOR(membership)[i] > max_groupid)
max_groupid = VECTOR(membership)[i];
}
groups = rb_ary_new();
for(i=0;i<max_groupid+1;i++){
rb_ary_push(groups,rb_ary_new());
}
for(i=0;i<igraph_vector_size(&membership);i++){
groupid = VECTOR(membership)[i];
if(groupid == -1)
groupid = 0;
group = RARRAY_PTR(groups)[groupid];
rb_ary_push(group,cIGraph_get_vertex_object(self, i));
}
res = rb_ary_new3(2,groups,
Data_Wrap_Struct(cIGraphMatrix, 0,
cIGraph_matrix_free, merges));
igraph_vector_destroy(&membership);
return res;
}
VALUE cIGraph_matrix_alloc(VALUE klass){
igraph_matrix_t *m = malloc(sizeof(igraph_matrix_t));
VALUE obj;
igraph_matrix_init(m, 0, 0);
obj = Data_Wrap_Struct(klass, 0, cIGraph_matrix_free, m);
return obj;
}
/* call-seq:
* graph.layout_random -> IGraphMatrix
*
* Returns a random layout in 3D.
*/
VALUE cIGraph_layout_random_3d(VALUE self) {
igraph_t *graph;
igraph_matrix_t *res = malloc(sizeof(igraph_matrix_t));
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(res,0,0);
igraph_layout_random_3d(graph,res);
return Data_Wrap_Struct(cIGraphMatrix, 0, cIGraph_matrix_free, res);
}
symmetric_matrix<double, lower> Graph::adjacency() const {
double x;
int i,j;
igraph_matrix_t m;
symmetric_matrix<double, lower> adjmatrix(size, size);
igraph_matrix_init(&m, size, size);
igraph_get_adjacency(graph, &m,IGRAPH_GET_ADJACENCY_LOWER); /* IGRAPH_GET_ADJACENCY_BOTH);*/
for(i = 0; i < size; i++){
for(j = 0; j <=i; j++) {
x = MATRIX(m,i,j) ? 1 : 0;
adjmatrix(i,j) = x;
}
}
igraph_matrix_destroy(&m);
return adjmatrix;
}
/* Erdos-Renyi : G(n,p)
*/
igraph_t *ggen_generate_erdos_gnp(gsl_rng *r, unsigned long n, double p)
{
igraph_matrix_t m;
igraph_t *g = NULL;
int err;
unsigned long i,j;
ggen_error_start_stack();
if(r == NULL)
GGEN_SET_ERRNO(GGEN_EINVAL);
if(p < 0.0 || p > 1.0)
GGEN_SET_ERRNO(GGEN_EINVAL);
g = malloc(sizeof(igraph_t));
GGEN_CHECK_ALLOC(g);
GGEN_FINALLY3(free,g,1);
if(p == 0.0)
{
GGEN_CHECK_IGRAPH(igraph_empty(g,n,1));
goto end;
}
if(p == 1.0)
{
GGEN_CHECK_IGRAPH(igraph_full_citation(g,n,1));
goto end;
}
GGEN_CHECK_IGRAPH(igraph_matrix_init(&m,n,n));
GGEN_FINALLY(igraph_matrix_destroy,&m);
for(i = 0; i < n; i++)
for(j = 0; j < n; j++)
if(i < j)
// coin flipping to determine if we add an edge or not
igraph_matrix_set(&m,i,j,gsl_ran_bernoulli(r,p));
else
igraph_matrix_set(&m,i,j,0);
GGEN_CHECK_IGRAPH(igraph_adjacency(g,&m,IGRAPH_ADJ_DIRECTED));
end:
ggen_error_clean(1);
return g;
ggen_error_label:
return NULL;
}
/* call-seq:
* graph.cocitation(varray) -> Array
*
* Cocitation coupling.
*
* Two vertices are cocited if there is another vertex citing both of them.
* igraph_cocitation() simply counts how many types two vertices are cocited.
* The cocitation score for each given vertex and all other vertices in the
* graph will be calculated.
*
*/
VALUE cIGraph_cocitation(VALUE self, VALUE vs){
igraph_t *graph;
igraph_vs_t vids;
igraph_vector_t vidv;
igraph_matrix_t res;
int i;
int j;
VALUE row;
VALUE path_length;
VALUE matrix = rb_ary_new();
int n_row;
int n_col;
Data_Get_Struct(self, igraph_t, graph);
n_row = NUM2INT(rb_funcall(vs,rb_intern("length"),0));
n_col = igraph_vcount(graph);
//matrix to hold the results of the calculations
igraph_matrix_init(&res,n_row,n_col);
//Convert an array of vertices to a vector of vertex ids
igraph_vector_init_int(&vidv,0);
cIGraph_vertex_arr_to_id_vec(self,vs,&vidv);
//create vertex selector from the vecotr of ids
igraph_vs_vector(&vids,&vidv);
igraph_cocitation(graph,&res,vids);
for(i=0; i<igraph_matrix_nrow(&res); i++){
row = rb_ary_new();
rb_ary_push(matrix,row);
for(j=0; j<igraph_matrix_ncol(&res); j++){
path_length = INT2NUM(MATRIX(res,i,j));
rb_ary_push(row,path_length);
}
}
igraph_vector_destroy(&vidv);
igraph_matrix_destroy(&res);
igraph_vs_destroy(&vids);
return matrix;
}
int main() {
igraph_matrix_t m;
igraph_matrix_init(&m, 10, 10);
if (igraph_matrix_capacity(&m) != 100) {
return 1;
}
igraph_matrix_add_cols(&m, 5);
igraph_matrix_resize(&m, 5, 5);
igraph_matrix_resize_min(&m);
if (igraph_matrix_capacity(&m) != igraph_matrix_size(&m)) {
return 2;
}
igraph_matrix_destroy(&m);
return 0;
}
int main() {
igraph_t graph;
igraph_matrix_t coords;
int i;
igraph_matrix_init(&coords, 0, 0);
for (i=0; i<10; i++) {
igraph_erdos_renyi_game(&graph, IGRAPH_ERDOS_RENYI_GNP, /*n=*/ 100,
/*p=*/ 2.0/100, IGRAPH_UNDIRECTED, /*loops=*/ 0);
igraph_layout_mds(&graph, &coords, /*dist=*/ 0, /*dim=*/ 2,
/*options=*/ 0);
igraph_destroy(&graph);
}
igraph_matrix_destroy(&coords);
return 0;
}
int main() {
igraph_matrix_t mat;
igraph_sparsemat_t spmat, spmat2;
int i;
igraph_real_t m1, m2;
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 (i=0; i<10; i++) {
igraph_sparsemat_entry(&spmat, INT(DIM1-1), INT(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;
}
VALUE cIGraph_community_walktrap(VALUE self, VALUE weights, VALUE steps){
igraph_t *graph;
igraph_vector_t weights_vec;
igraph_vector_t modularity;
igraph_matrix_t *merges = malloc(sizeof(igraph_matrix_t));
int i;
VALUE modularity_a, res;
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(merges,0,0);
igraph_vector_init(&weights_vec,0);
igraph_vector_init(&modularity,0);
for(i=0;i<RARRAY_LEN(weights);i++){
VECTOR(weights_vec)[i] = NUM2DBL(RARRAY_PTR(weights)[i]);
}
igraph_community_walktrap(graph,
igraph_vector_size(&weights_vec) > 0 ? &weights_vec : NULL,
NUM2INT(steps),merges,&modularity);
modularity_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&modularity);i++){
rb_ary_push(modularity_a,rb_float_new(VECTOR(modularity)[i]));
}
res = rb_ary_new3(2,
Data_Wrap_Struct(cIGraphMatrix, 0,
cIGraph_matrix_free, merges),
modularity_a);
igraph_vector_destroy(&weights_vec);
igraph_vector_destroy(&modularity);
return res;
}
int main() {
igraph_t g;
igraph_matrix_t m;
igraph_small(&g, 0, IGRAPH_DIRECTED,
0,1, 2,1, 2,0, 3,0,
-1);
igraph_matrix_init(&m, 0, 0);
igraph_bibcoupling(&g, &m, igraph_vss_all());
print_matrix(&m, stdout);
igraph_cocitation(&g, &m, igraph_vss_all());
print_matrix(&m, stdout);
igraph_matrix_destroy(&m);
igraph_destroy(&g);
return 0;
}
VALUE cIGraph_community_eb_get_merges(VALUE self, VALUE edges){
igraph_t *graph;
igraph_matrix_t *res = malloc(sizeof(igraph_matrix_t));
igraph_vector_t edges_vec;
igraph_vector_t bridges_vec;
VALUE result,bridges_a;
int i;
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(res,0,0);
igraph_vector_init(&edges_vec,0);
igraph_vector_init(&bridges_vec,0);
for(i=0;i<RARRAY_LEN(edges);i++){
igraph_vector_push_back(&edges_vec,NUM2INT(RARRAY_PTR(edges)[i]));
}
igraph_community_eb_get_merges(graph,&edges_vec,res,&bridges_vec);
bridges_a = rb_ary_new();
for(i=0;i<igraph_vector_size(&bridges_vec);i++){
rb_ary_push(bridges_a,INT2NUM(VECTOR(bridges_vec)[i]));
}
igraph_vector_destroy(&bridges_vec);
igraph_vector_destroy(&edges_vec);
result = rb_ary_new3(2,
Data_Wrap_Struct(cIGraphMatrix, 0,
cIGraph_matrix_free, res),
bridges_a);
return result;
}
int* readGrafo(){
int *grafo;
igraph_matrix_t gMatrix;
igraph_t g;
igraph_i_set_attribute_table(&igraph_cattribute_table);
FILE *ifile;
ifile=fopen("/home/john/git/primAlgorithm/celegansneural.gml"/*"/home/john/git/primAlgorithm/grafo.gml"*/, "r");
if (ifile==0) {
printf("Problema abriendo archivo de grafo\n");
return NULL;
}
igraph_read_graph_gml(&g, ifile);
fclose(ifile);
numNodos = igraph_vcount(&g);
grafo = malloc(numNodos*numNodos*sizeof(int));
igraph_matrix_init(&gMatrix,numNodos,numNodos);
igraph_get_adjacency(&g,&gMatrix,IGRAPH_GET_ADJACENCY_BOTH,1);
igraph_vector_t el;
int ii, jj, n;
igraph_vector_init(&el, 0);
igraph_get_edgelist(&g, &el, 0);
n = igraph_ecount(&g);
memset(grafo,INT_MAX2,numNodos*numNodos*sizeof(int));
for (ii=0, jj=0; ii<n; ii++, jj+=2) {
grafo[((long)VECTOR(el)[jj])+numNodos*((long)VECTOR(el)[jj+1])] = (int)EAN(&g, "weight", ii);
grafo[((long)VECTOR(el)[jj+1])+numNodos*((long)VECTOR(el)[jj])] = (int)EAN(&g, "weight", ii);
}
printf("\nNumero de nodos %d",numNodos);
igraph_vector_destroy(&el);
igraph_destroy(&g);
return grafo;
}
/* call-seq:
* graph.layout_kamada_kawai_3d -> IGraphMatrix
*
* Places the vertices on a plane according the Kamada-Kawai algorithm.
*
* This is a force directed layout, see Kamada, T. and Kawai, S.: An
* Algorithm for Drawing General Undirected Graphs. Information Processing
* Letters, 31/1, 7--15, 1989.
*/
VALUE cIGraph_layout_kamada_kawai_3d(VALUE self,
VALUE niter,
VALUE sigma,
VALUE initemp,
VALUE coolexp,
VALUE kkconst) {
igraph_t *graph;
igraph_matrix_t *res = malloc(sizeof(igraph_matrix_t));
Data_Get_Struct(self, igraph_t, graph);
igraph_matrix_init(res,0,0);
igraph_layout_kamada_kawai_3d(graph,res,
NUM2INT(niter),
NUM2DBL(sigma),
NUM2DBL(initemp),
NUM2DBL(coolexp),
NUM2DBL(kkconst),0);
return Data_Wrap_Struct(cIGraphMatrix, 0, cIGraph_matrix_free, res);
}
int test_normalized_laplacian(igraph_bool_t dir) {
igraph_t g;
igraph_matrix_t m;
igraph_vector_t vec;
igraph_matrix_init(&m, 1, 1);
igraph_bool_t ok = 1;
/* Undirected graph, no loop or multiple edges */
igraph_ring(&g, 5, dir, 0, 1);
igraph_laplacian(&g, &m, 1);
ok = ok && check_laplacian(&g, &m);
/* Add some loop edges */
igraph_vector_init_real(&vec, 4, 1.0, 1.0, 2.0, 2.0);
igraph_add_edges(&g, &vec, 0);
igraph_vector_destroy(&vec);
igraph_laplacian(&g, &m, 1);
ok = ok && check_laplacian(&g, &m);
/* Duplicate some edges */
igraph_vector_init_real(&vec, 4, 1.0, 2.0, 3.0, 4.0);
igraph_add_edges(&g, &vec, 0);
igraph_vector_destroy(&vec);
igraph_laplacian(&g, &m, 1);
ok = ok && check_laplacian(&g, &m);
igraph_destroy(&g);
igraph_matrix_destroy(&m);
if (ok)
printf("OK\n");
return !ok;
}
int igraph_i_eigen_arpackfun_to_mat(igraph_arpack_function_t *fun,
int n, void *extra,
igraph_matrix_t *res) {
int i;
igraph_vector_t v;
IGRAPH_CHECK(igraph_matrix_init(res, n, n));
IGRAPH_FINALLY(igraph_matrix_destroy, res);
IGRAPH_VECTOR_INIT_FINALLY(&v, n);
VECTOR(v)[0]=1;
IGRAPH_CHECK(fun(/*to=*/ &MATRIX(*res, 0, 0), /*from=*/ VECTOR(v), n,
extra));
for (i=1; i<n; i++) {
VECTOR(v)[i-1]=0;
VECTOR(v)[i ]=1;
IGRAPH_CHECK(fun(/*to=*/ &MATRIX(*res, 0, i), /*from=*/ VECTOR(v), n,
extra));
}
igraph_vector_destroy(&v);
IGRAPH_FINALLY_CLEAN(2);
return 0;
}