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#include "cluster.h"
v_t flip_cluster(ising_state_t *s, v_t v0, q_t rot, gsl_rng *r) {
v_t nv = 0;
ll_t *stack = NULL; // create a new stack
stack_push(&stack, v0); // push the initial vertex to the stack
bool *marks = (bool *)calloc(s->g->nv, sizeof(bool));
while (stack != NULL) {
v_t v = stack_pop(&stack);
if (!marks[v]) {
q_t s_old, s_new;
dihedral_t *R_new;
bool external_flipped;
marks[v] = true;
if (v == s->g->nv - 1) {
R_new = dihedral_compose(s->q, rot, s->R);
external_flipped = true;
} else {
s_old = s->spins[v];
s_new = dihedral_act(s->q, rot, s_old);
external_flipped = false;
}
v_t nn = s->g->v_i[v + 1] - s->g->v_i[v];
for (v_t i = 0; i < nn; i++) {
q_t sn;
double prob;
bool external_neighbor = false;
v_t vn = s->g->v_adj[s->g->v_i[v] + i];
if (vn == s->g->nv - 1) {
external_neighbor = true;
} else {
sn = s->spins[vn];
}
if (external_flipped || external_neighbor) {
q_t rot_s_old, rot_s_new;
if (external_neighbor) {
rot_s_old = dihedral_inverse_act(s->q, s->R, s_old);
rot_s_new = dihedral_inverse_act(s->q, s->R, s_new);
} else {
rot_s_old = dihedral_inverse_act(s->q, s->R, sn);
rot_s_new = dihedral_inverse_act(s->q, R_new, sn);
}
prob = s->H_probs[rot_s_new * s->q + rot_s_old];
s->M[rot_s_old]--;
s->M[rot_s_new]++;
s->E += - s->H[rot_s_new] + s->H[rot_s_old];
} else {
q_t diff_old = (s_old + s->q - sn) % s->q;
q_t diff_new = (s_new + s->q - sn) % s->q;
prob = s->J_probs[diff_new * s->q + diff_old];
s->E += - s->J[diff_new] + s->J[diff_old];
}
if (gsl_rng_uniform(r) < prob) { // and with probability ps[e]...
stack_push(&stack, vn); // push the neighboring vertex to the stack
}
}
if (external_flipped) {
free(s->R);
s->R = R_new;
} else {
s->spins[v] = s_new;
}
if (v != s->g->nv - 1) { // count the number of non-external sites that flip
nv++;
}
}
}
free(marks);
return nv;
}
v_t flip_cluster_vector(vector_state_t *s, v_t v0, double *rot, gsl_rng *r) {
v_t nv = 0;
ll_t *stack = NULL; // create a new stack
stack_push(&stack, v0); // push the initial vertex to the stack
//node_t *T = NULL;
bool *marks = (bool *)calloc(s->g->nv, sizeof(bool));
while (stack != NULL) {
v_t v = stack_pop(&stack);
// if (!tree_contains(T, v)) { // if the vertex hasn't already been flipped
if (!marks[v]) {
double *s_old, *s_new, *R_tmp;
//tree_insert(&T, v);
marks[v] = true;
if (v == s->g->nv - 1) {
R_tmp = orthogonal_rotate(s->n, rot, s->R);
} else {
s_old = &(s->spins[s->n * v]); // don't free me! I'm a pointer within array s->spins
s_new = vector_rotate(s->n, rot, s_old); // free me! I'm a new vector
}
v_t nn = s->g->v_i[v + 1] - s->g->v_i[v];
for (v_t i = 0; i < nn; i++) {
v_t vn = s->g->v_adj[s->g->v_i[v] + i];
double *sn;
if (vn != s->g->nv - 1) {
sn = &(s->spins[s->n * vn]);
}
double prob;
bool is_ext = (v == s->g->nv - 1 || vn == s->g->nv - 1);
if (is_ext) {
double *rs_old, *rs_new;
if (vn == s->g->nv - 1) {
rs_old = vector_rotate_inverse(s->n, s->R, s_old);
rs_new = vector_rotate_inverse(s->n, s->R, s_new);
} else {
rs_old = vector_rotate_inverse(s->n, s->R, sn);
rs_new = vector_rotate_inverse(s->n, R_tmp, sn);
}
double dE = s->H(s->n, s->H_info, rs_old) - s->H(s->n, s->H_info, rs_new);
prob = 1.0 - exp(-dE / s->T);
vector_subtract(s->n, s->M, rs_old);
vector_add(s->n, s->M, rs_new);
s->E += dE;
free(rs_old);
free(rs_new);
} else {
double dE = (s->J)(vector_dot(s->n, sn, s_old)) - (s->J)(vector_dot(s->n, sn, s_new));
prob = 1.0 - exp(-dE / s->T);
//printf("(%g %g) (%g %g) (%g %g) %g\n", s_old[0], s_old[1], s_new[0], s_new[1], sn[0], sn[1], dE);
//getchar();
s->E += dE;
}
if (gsl_rng_uniform(r) < prob) { // and with probability ps[e]...
stack_push(&stack, vn); // push the neighboring vertex to the stack
}
}
if (v == s->g->nv - 1) {
free(s->R);
s->R = R_tmp;
} else {
vector_replace(s->n, s_old, s_new);
free(s_new);
}
if (v != s->g->nv - 1) { // count the number of non-external sites that flip
nv++;
}
}
}
//tree_freeNode(T);
free(marks);
return nv;
}
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