bool count_subsystem_particle_counts_for_match (const Wavefunction<amplitude_t>::Amplitude &wf1, const Wavefunction<amplitude_t>::Amplitude &wf2,
const Subsystem &subsystem)
{
assert(subsystem.lattice_makes_sense(wf1.get_lattice()));
assert(subsystem.lattice_makes_sense(wf2.get_lattice()));
// (we are also assuming that the lattices are in fact equivalent)
const PositionArguments &r1 = wf1.get_positions();
const PositionArguments &r2 = wf2.get_positions();
assert(r1.get_N_species() == r2.get_N_species());
assert(r1.get_N_sites() == r2.get_N_sites());
for (unsigned int species = 0; species < r1.get_N_species(); ++species) {
assert(r1.get_N_filled(species) == r2.get_N_filled(species));
unsigned int count1 = 0, count2 = 0;
for (unsigned int i = 0; i < r1.get_N_filled(species); ++i) {
const Particle particle(i, species);
if (subsystem.position_is_within(r1[particle], wf1.get_lattice()))
++count1;
if (subsystem.position_is_within(r2[particle], wf2.get_lattice()))
++count2;
}
if (count1 != count2)
return false;
}
return true;
}
unsigned int BaseSwapPossibleWalk::count_subsystem_sites (const Subsystem &subsystem, const Lattice &lattice)
{
// (this is a static method)
unsigned int N_subsystem_sites = 0;
for (unsigned int i = 0; i < lattice.total_sites(); ++i) {
if (subsystem.position_is_within(i, lattice))
++N_subsystem_sites;
}
return N_subsystem_sites;
}