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#include "space_wolff.hpp"
int main(int argc, char* argv[]) {
const unsigned D = 2;
double L = 32;
unsigned N = 1000;
double T = 2.0 / log(1.0 + sqrt(2.0));
double H = 1.0;
unsigned n = 25;
int opt;
while ((opt = getopt(argc, argv, "n:N:L:T:H:")) != -1) {
switch (opt) {
case 'n':
n = (unsigned)atof(optarg);
break;
case 'N':
N = (unsigned)atof(optarg);
break;
case 'L':
L = atof(optarg);
break;
case 'T':
T = atof(optarg);
break;
case 'H':
H = atof(optarg);
break;
default:
exit(1);
}
}
std::function<double(spin<double, D, double>, spin<double, D, double>, spin<double, D, double>)> Z =
[L] (spin<double, D, double> s1, spin<double, D, double> s2, spin<double, D, double> s1_new) -> double {
vector<double, D> diff_old = diff(L, s1.x, s2.x);
vector<double, D> diff_new = diff(L, s1_new.x, s2.x);
double rad_sum = pow(s1.s + s2.s, 2);
bool old_overlap = diff_old.transpose() * diff_old < rad_sum;
bool new_overlap = diff_new.transpose() * diff_new < rad_sum;
if (new_overlap) {
return 1.0;
} else {
return 0.0;
}
};
std::function<double(spin<double, D, double>)> B =
[L, H] (spin<double, D, double> s) -> double {
return H * sin(2 * M_PI * 3 * s.x(0) / L);
};
std::function<std::set<unsigned>(model<double, D, double>&, unsigned, spin<double, D, double>)> neighbors =
[] (model<double, D, double>& m, unsigned i0, spin<double, D, double> s1) -> std::set<unsigned> {
std::set<unsigned> nn;
if (i0 < m.s.size()) {
std::set<unsigned> n_old = m.dict.neighbors(m.s[i0].x, 1);
std::set<unsigned> n_new = m.dict.neighbors(s1.x, 1);;
nn.insert(n_old.begin(), n_old.end());
nn.insert(n_new.begin(), n_new.end());
nn.insert(m.s.size());
} else {
for (unsigned i = 0; i < m.s.size(); i++) {
nn.insert(i);
}
}
return nn;
};
model<double, D, double> sphere(L, Z, B, neighbors);
randutils::auto_seed_128 seeds;
std::mt19937 rng{seeds};
std::uniform_real_distribution<double> dist(0.0, L);
for (unsigned i = 0; i < n; i++) {
vector<double, D> pos = {dist(rng), dist(rng)};
sphere.s.push_back({pos, 0.5});
sphere.dict.record<double>(pos, i);
}
sphere.wolff(T, N, rng);
std::ofstream snapfile;
snapfile.open("sphere_snap.dat");
for (spin<double, D, double> s : sphere.s) {
spin<double, D, double> rs = sphere.s0.inverse().act(s);
snapfile << rs.x.transpose() << "\n";
}
snapfile.close();
return 0;
}
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