def _preprocess(self, struct1, struct2, niggli=True):
"""
Rescales, finds the reduced structures (primitive and niggli),
and finds fu, the supercell size to make struct1 comparable to
s2
"""
struct1 = Structure.from_sites(struct1)
struct2 = Structure.from_sites(struct2)
if niggli:
struct1 = struct1.get_reduced_structure(reduction_algo="niggli")
struct2 = struct2.get_reduced_structure(reduction_algo="niggli")
#primitive cell transformation
if self._primitive_cell:
struct1 = struct1.get_primitive_structure()
struct2 = struct2.get_primitive_structure()
if self._supercell:
fu, s1_supercell = self._get_supercell_size(struct1, struct2)
else:
fu, s1_supercell = 1, True
mult = fu if s1_supercell else 1/fu
#rescale lattice to same volume
if self._scale:
ratio = (struct2.volume / (struct1.volume * mult)) ** (1 / 6)
nl1 = Lattice(struct1.lattice.matrix * ratio)
struct1.modify_lattice(nl1)
nl2 = Lattice(struct2.lattice.matrix / ratio)
struct2.modify_lattice(nl2)
return struct1, struct2, fu, s1_supercell
def get_aligned_lattices(slab_sub, slab_2d, max_area=200,
max_mismatch=0.05,
max_angle_diff=1, r1r2_tol=0.2):
"""
given the 2 slab structures and the alignment paramters, return
slab structures with lattices that are aligned with respect to each
other
"""
# get the matching substrate and 2D material lattices
uv_substrate, uv_mat2d = get_matching_lattices(slab_sub, slab_2d,
max_area=max_area,
max_mismatch=max_mismatch,
max_angle_diff=max_angle_diff,
r1r2_tol=r1r2_tol)
if not uv_substrate and not uv_mat2d:
print("no matching u and v, trying adjusting the parameters")
sys.exit()
substrate = Structure.from_sites(slab_sub)
mat2d = Structure.from_sites(slab_2d)
# map the intial slabs to the newly found matching lattices
substrate_latt = Lattice(np.array(
[
uv_substrate[0][:],
uv_substrate[1][:],
substrate.lattice.matrix[2, :]
]))
# to avoid numerical issues with find_mapping
mat2d_fake_c = mat2d.lattice.matrix[2, :] / np.linalg.norm(mat2d.lattice.matrix[2, :]) * 5.0
mat2d_latt = Lattice(np.array(
[
uv_mat2d[0][:],
uv_mat2d[1][:],
mat2d_fake_c
]))
mat2d_latt_fake = Lattice(np.array(
[
mat2d.lattice.matrix[0, :],
mat2d.lattice.matrix[1, :],
mat2d_fake_c
]))
_, __, scell = substrate.lattice.find_mapping(substrate_latt,
ltol=0.05,
atol=1)
scell[2] = np.array([0, 0, 1])
substrate.make_supercell(scell)
_, __, scell = mat2d_latt_fake.find_mapping(mat2d_latt,
ltol=0.05,
atol=1)
scell[2] = np.array([0, 0, 1])
mat2d.make_supercell(scell)
# modify the substrate lattice so that the 2d material can be
# grafted on top of it
lmap = Lattice(np.array(
[
substrate.lattice.matrix[0, :],
substrate.lattice.matrix[1, :],
mat2d.lattice.matrix[2, :]
]))
mat2d.modify_lattice(lmap)
return substrate, mat2d
def _get_structures(self, num_structs):
structs = []
rs = subprocess.Popen(["makestr.x",
"struct_enum.out", str(0),
str(num_structs - 1)],
stdout=subprocess.PIPE,
stdin=subprocess.PIPE, close_fds=True)
rs.communicate()
if len(self.ordered_sites) > 0:
original_latt = self.ordered_sites[0].lattice
# Need to strip sites of site_properties, which would otherwise
# result in an index error. Hence Structure is reconstructed in
# the next step.
ordered_structure = Structure(
original_latt,
[site.species_and_occu for site in self.ordered_sites],
[site.frac_coords for site in self.ordered_sites])
inv_org_latt = np.linalg.inv(original_latt.matrix)
for n in range(1, num_structs + 1):
with open("vasp.{:06d}".format(n)) as f:
data = f.read()
data = re.sub("scale factor", "1", data)
data = re.sub("(\d+)-(\d+)", r"\1 -\2", data)
poscar = Poscar.from_string(data, self.index_species)
sub_structure = poscar.structure
#Enumeration may have resulted in a super lattice. We need to
#find the mapping from the new lattice to the old lattice, and
#perform supercell construction if necessary.
new_latt = sub_structure.lattice
sites = []
if len(self.ordered_sites) > 0:
transformation = np.dot(new_latt.matrix, inv_org_latt)
transformation = [[int(round(cell)) for cell in row]
for row in transformation]
logger.debug("Supercell matrix: {}".format(transformation))
s = Structure.from_sites(ordered_structure)
s.make_supercell(transformation)
sites.extend([site.to_unit_cell for site in s])
super_latt = sites[-1].lattice
else:
super_latt = new_latt
for site in sub_structure:
if site.specie.symbol != "X": # We exclude vacancies.
sites.append(PeriodicSite(site.species_and_occu,
site.frac_coords,
super_latt).to_unit_cell)
structs.append(Structure.from_sites(sorted(sites)))
logger.debug("Read in a total of {} structures.".format(num_structs))
return structs
def get_s2_like_s1(self, struct1, struct2):
"""
Performs transformations on struct2 to put it in a basis similar to
struct1 (without changing any of the inter-site distances)
Args:
struct1 (Structure): Reference structure
struct2 (Structure): Structure to transform.
Returns:
A structure object similar to struct1, obtained by making a
supercell, sorting, and translating struct2.
"""
trans = self.get_transformation(struct1, struct2)
if trans is None:
return None
sc, t, mapping = trans
temp = struct2.copy()
temp.make_supercell(sc)
temp.translate_sites(list(range(len(temp))), t)
#translate sites to correct unit cell
for i, j in enumerate(mapping[:len(struct1)]):
if j is not None:
vec = np.round(struct1[i].frac_coords - temp[j].frac_coords)
temp.translate_sites(j, vec, to_unit_cell=False)
return Structure.from_sites([temp.sites[i] for i in mapping if i is not None])
def _get_host(structure, species_to_remove):
if species_to_remove:
s = Structure.from_sites(structure)
s.remove_species(species_to_remove)
return s
else:
return structure
def get_sorted_structure(self):
"""
orders the structure according to increasing Z of the elements
"""
sites = sorted(self.sites, key=lambda site: site.specie.Z)
structure = Structure.from_sites(sites)
return AbiStructure(structure)
def best_first_ordering(self, structure, num_remove_dict):
self.logger.debug("Performing best first ordering")
starttime = time.time()
self.logger.debug("Performing initial ewald sum...")
ewaldsum = EwaldSummation(structure)
self.logger.debug("Ewald sum took {} seconds.".format(time.time() - starttime))
starttime = time.time()
ematrix = ewaldsum.total_energy_matrix
to_delete = []
totalremovals = sum(num_remove_dict.values())
removed = {k: 0 for k in num_remove_dict.keys()}
for i in range(totalremovals):
maxindex = None
maxe = float("-inf")
maxindices = None
for indices in num_remove_dict.keys():
if removed[indices] < num_remove_dict[indices]:
for ind in indices:
if ind not in to_delete:
energy = sum(ematrix[:, ind]) + sum(ematrix[:, ind]) - ematrix[ind, ind]
if energy > maxe:
maxindex = ind
maxe = energy
maxindices = indices
removed[maxindices] += 1
to_delete.append(maxindex)
ematrix[:, maxindex] = 0
ematrix[maxindex, :] = 0
s = Structure.from_sites(structure.sites)
s.remove_sites(to_delete)
self.logger.debug("Minimizing Ewald took {} seconds.".format(time.time() - starttime))
return [{"energy": sum(sum(ematrix)), "structure": s.get_sorted_structure()}]
def test_magic(self):
s = Structure.from_sites(self.structure)
self.assertEqual(s, self.structure)
self.assertNotEqual(s, None)
s.apply_strain(0.5)
self.assertNotEqual(s, self.structure)
self.assertNotEqual(self.structure * 2, self.structure)
def apply_transformation(self, structure):
s = Structure.from_sites(structure.sites)
for i, sp in enumerate(self._species):
s.insert(i, sp, self._coords[i],
coords_are_cartesian=self._cartesian,
validate_proximity=self._validate_proximity)
return s.get_sorted_structure()
def __str__(self):
"""
Sorts a Structure (by fractional co-ordinate), and
prints sites with magnetic information. This is
useful over Structure.__str__ because sites are in
a consistent order, which makes visual comparison between
two identical Structures with different magnetic orderings
easier.
:return:
"""
frac_coords = self.structure.frac_coords
sorted_indices = np.lexsort((frac_coords[:, 2],
frac_coords[:, 1],
frac_coords[:, 0]))
s = Structure.from_sites([self.structure[idx] for idx in sorted_indices])
# adapted from Structure.__repr__
outs = ["Structure Summary", repr(s.lattice)]
outs.append("Magmoms Sites")
for site in s:
if site.properties['magmom'] != 0:
prefix = "{:+.2f} ".format(site.properties['magmom'])
else:
prefix = " "
outs.append(prefix+repr(site))
return "\n".join(outs)
def get_s2_like_s1(self, struct1, struct2):
"""
Performs transformations on struct2 to put it in a basis similar to
struct1 (without changing any of the inter-site distances)
Args:
struct1 (Structure): Reference structure
struct2 (Structure): Structure to transform.
Returns:
A structure object similar to struct1, obtained by making a
supercell, sorting, and translating struct2.
"""
if self._primitive_cell:
raise ValueError("get_s2_like_s1 cannot be used with the primitive"
" cell option")
s1, s2, fu, s1_supercell = self._preprocess(struct1, struct2, False)
ratio = fu if s1_supercell else 1/fu
if s1_supercell and fu > 1:
raise ValueError("Struct1 must be the supercell, "
"not the other way around")
temp = struct2.copy()
if len(s1) * ratio >= len(s2):
#s1 is superset
match = self._strict_match(s1, s2, fu=fu, s1_supercell=False,
use_rms=True, break_on_match=False)
if match is None:
return None
temp.make_supercell(match[2])
temp.translate_sites(list(range(len(temp))), match[3],
to_unit_cell=False)
# translate sites to be in correct unit cell
for i, j in enumerate(match[4]):
vec = np.round(s1[j].frac_coords - temp[i].frac_coords)
temp.translate_sites(i, vec, to_unit_cell=False)
#invert the mapping, since it needs to be from s2 to s1
mapping = np.argsort(match[4])
else:
#s2 is superset
match = self._strict_match(s2, s1, fu=fu, s1_supercell=True,
use_rms=True, break_on_match=False)
if match is None:
return None
temp.make_supercell(match[2])
temp.translate_sites(list(range(len(temp))), -match[3],
to_unit_cell=False)
# translate sites to be in correct unit cell
for i, j in enumerate(match[4]):
vec = np.round(s1[i].frac_coords - temp[j].frac_coords)
temp.translate_sites(j, vec, to_unit_cell=False)
#add sites not included in the mapping
not_included = list(range(len(temp)))
for i in match[4]:
not_included.remove(i)
mapping = list(match[4]) + not_included
return Structure.from_sites([temp.sites[i] for i in mapping])
def translate_sites(self, lattice):
s = Structure(lattice, [self.central_subsite.specie] + [site.specie for site in self.peripheral_subsites], [self.central_subsite.site.coords] + [site.site.coords for site in self.peripheral_subsites], coords_are_cartesian=True)
trans = TranslateSitesTransformation(range(len(s)), -(lattice.get_fractional_coords(s[0].coords)))
new_s = trans.apply_transformation(s)
trans2 = TranslateSitesTransformation(range(len(s)), (-0.5, -0.5, -0.5))
new_s = trans2.apply_transformation(Structure.from_sites(new_s.sites, to_unit_cell=True))
self.peripheral_subsites = [SubStructureSite.from_coords_and_specie(site.coords, site.specie) for site in new_s.sites[1:]]
self.central_subsite = SubStructureSite.from_coords_and_specie(new_s[0].coords, new_s[0].specie)
def _process_species(self, structures):
copied_structures = []
for s in structures:
ss = Structure.from_sites(s)
if self._ignored_species:
ss.remove_species(self._ignored_species)
copied_structures.append(ss)
return copied_structures
def complete_ordering(self, structure, num_remove_dict):
self.logger.debug("Performing complete ordering...")
all_structures = []
from pymatgen.symmetry.finder import SymmetryFinder
symprec = 0.2
s = SymmetryFinder(structure, symprec=symprec)
self.logger.debug("Symmetry of structure is determined to be {}."
.format(s.get_spacegroup_symbol()))
sg = s.get_spacegroup()
tested_sites = []
starttime = time.time()
self.logger.debug("Performing initial ewald sum...")
ewaldsum = EwaldSummation(structure)
self.logger.debug("Ewald sum took {} seconds."
.format(time.time() - starttime))
starttime = time.time()
allcombis = []
for ind, num in num_remove_dict.items():
allcombis.append(itertools.combinations(ind, num))
count = 0
for allindices in itertools.product(*allcombis):
sites_to_remove = []
indices_list = []
for indices in allindices:
sites_to_remove.extend([structure[i] for i in indices])
indices_list.extend(indices)
s_new = Structure.from_sites(structure.sites)
s_new.remove_sites(indices_list)
energy = ewaldsum.compute_partial_energy(indices_list)
already_tested = False
for i, tsites in enumerate(tested_sites):
tenergy = all_structures[i]["energy"]
if abs((energy - tenergy) / len(s_new)) < 1e-5 and \
sg.are_symmetrically_equivalent(sites_to_remove,
tsites,
symm_prec=symprec):
already_tested = True
if not already_tested:
tested_sites.append(sites_to_remove)
all_structures.append({"structure": s_new, "energy": energy})
count += 1
if count % 10 == 0:
timenow = time.time()
self.logger.debug("{} structures, {:.2f} seconds."
.format(count, timenow - starttime))
self.logger.debug("Average time per combi = {} seconds"
.format((timenow - starttime) / count))
self.logger.debug("{} symmetrically distinct structures found."
.format(len(all_structures)))
self.logger.debug("Total symmetrically distinct structures found = {}"
.format(len(all_structures)))
all_structures = sorted(all_structures, key=lambda s: s["energy"])
return all_structures
def apply_transformation(self, structure, return_ranked_list=False):
#Make a mutable structure first
mods = Structure.from_sites(structure)
for sp, spin in self.mag_species_spin.items():
sp = get_el_sp(sp)
oxi_state = getattr(sp, "oxi_state", 0)
if spin:
up = Specie(sp.symbol, oxi_state, {"spin": abs(spin)})
down = Specie(sp.symbol, oxi_state, {"spin": -abs(spin)})
mods.replace_species(
{sp: Composition({up: self.order_parameter,
down: 1 - self.order_parameter})})
else:
mods.replace_species(
{sp: Specie(sp.symbol, oxi_state, {"spin": spin})})
if mods.is_ordered:
return [mods] if return_ranked_list > 1 else mods
enum_args = self.enum_kwargs
enum_args["min_cell_size"] = max(int(
MagOrderingTransformation.determine_min_cell(
structure, self.mag_species_spin,
self.order_parameter)),
enum_args.get("min_cell_size"))
max_cell = self.enum_kwargs.get('max_cell_size')
if max_cell:
if enum_args["min_cell_size"] > max_cell:
raise ValueError('Specified max cell size is smaller'
' than the minimum enumerable cell size')
else:
enum_args["max_cell_size"] = enum_args["min_cell_size"]
t = EnumerateStructureTransformation(**enum_args)
alls = t.apply_transformation(mods,
return_ranked_list=return_ranked_list)
try:
num_to_return = int(return_ranked_list)
except ValueError:
num_to_return = 1
if num_to_return == 1 or not return_ranked_list:
return alls[0]["structure"] if num_to_return else alls
m = StructureMatcher(comparator=SpinComparator())
grouped = m.group_structures([d["structure"] for d in alls])
alls = [{"structure": g[0], "energy": self.emodel.get_energy(g[0])}
for g in grouped]
self._all_structures = sorted(alls, key=lambda d: d["energy"])
return self._all_structures[0:num_to_return]
def get_structure_with_nodes(self):
"""
Get the modified structure with the voronoi nodes inserted. The
species is set as a DummySpecie X.
"""
new_s = Structure.from_sites(self.structure)
for v in self.vnodes:
new_s.append("X", v.frac_coords)
return new_s
def get_s2_like_s1(self, struct1, struct2, include_ignored_species=True):
"""
Performs transformations on struct2 to put it in a basis similar to
struct1 (without changing any of the inter-site distances)
Args:
struct1 (Structure): Reference structure
struct2 (Structure): Structure to transform.
include_ignored_species (bool): Defaults to True,
the ignored_species is also transformed to the struct1
lattice orientation, though obviously there is no direct
matching to existing sites.
Returns:
A structure object similar to struct1, obtained by making a
supercell, sorting, and translating struct2.
"""
s1, s2 = self._process_species([struct1, struct2])
trans = self.get_transformation(s1, s2)
if trans is None:
return None
sc, t, mapping = trans
sites = [site for site in s2]
# Append the ignored sites at the end.
sites.extend([site for site in struct2 if site not in s2])
temp = Structure.from_sites(sites)
temp.make_supercell(sc)
temp.translate_sites(list(range(len(temp))), t)
# translate sites to correct unit cell
for i, j in enumerate(mapping[:len(s1)]):
if j is not None:
vec = np.round(struct1[i].frac_coords - temp[j].frac_coords)
temp.translate_sites(j, vec, to_unit_cell=False)
sites = [temp.sites[i] for i in mapping if i is not None]
if include_ignored_species:
start = int(round(len(temp) / len(struct2) * len(s2)))
sites.extend(temp.sites[start:])
return Structure.from_sites(sites)
def apply_transformation(self, structure):
species_map = {}
for k, v in self._species_map.items():
if isinstance(v, dict):
value = {smart_element_or_specie(x): y for x, y in v.items()}
else:
value = smart_element_or_specie(v)
species_map[smart_element_or_specie(k)] = value
s = Structure.from_sites(structure.sites)
s.replace_species(species_map)
return s
def _process_species(self, structures):
copied_structures = []
for s in structures:
# We need the copies to be actual Structure to work properly, not
# subclasses. So do type(s) == Structure.
ss = s.copy() if type(s) == Structure else \
Structure.from_sites(s)
if self._ignored_species:
ss.remove_species(self._ignored_species)
copied_structures.append(ss)
return copied_structures
def enumerate_ordering(self, structure):
# Generate the disordered structure first.
s = Structure.from_sites(structure.sites)
for indices, fraction in zip(self._indices, self._fractions):
for ind in indices:
new_sp = {sp: occu * fraction for sp, occu in structure[ind].species_and_occu.items()}
s[ind] = new_sp
# Perform enumeration
from pymatgen.transformations.advanced_transformations import EnumerateStructureTransformation
trans = EnumerateStructureTransformation()
return trans.apply_transformation(s, 10000)
def get_percolated_node_edge(origin_struct, node_struct, rad_dict, probe_rad):
"""
The function "get_voronoi_node_edge" gave all node information, but we need the percolated nodes. This function
conbine with function "get_voronoi_percolate_nodes" to delete the isolated nodes and correct the neighbor
information in the Structure from get_voronoi_node_edge.
"""
_, vor_accessible_node_struct, _, _ = get_voronoi_percolate_nodes(
origin_struct, rad_dict, probe_rad)
# print vor_accessible_node_struct.lattice == node_struct.lattice
# print vor_accessible_node_struct
# node_struct_copy = copy.deepcopy(node_struct)
unaccess_list = []
access_list = []
for i_index, i in enumerate(node_struct):
match = 0
for j_index, j in enumerate(vor_accessible_node_struct):
if i.is_periodic_image(j, tolerance=1e-3, check_lattice=True):
match = 1
break
if match == 0:
unaccess_list.append(i_index)
else:
access_list.append(i_index)
new_id = range(len(access_list))
old_new_corr = {}
for i_index, i in enumerate(access_list):
old_new_corr[i] = new_id[i_index]
access_node_site_list = [copy.deepcopy(site) for site_index, site in enumerate(node_struct) \
if site_index in access_list]
final_access_node_site_list = []
for i_index, i in enumerate(access_node_site_list):
neighbor_nodes = [copy.deepcopy(neighbor) for neighbor in i.properties['neighbor_nodes'] \
if neighbor[0] in access_list]
for j_index, j in enumerate(neighbor_nodes):
new_id = old_new_corr[j[0]]
neighbor_nodes[j_index] = copy.deepcopy([new_id] + j[1:])
properties = i.properties
properties['neighbor_nodes'] = neighbor_nodes
node_site = PeriodicSite(i.species_string,
i.coords,
i.lattice,
to_unit_cell=False,
coords_are_cartesian=True,
properties=properties)
final_access_node_site_list.append(node_site)
if final_access_node_site_list:
new_node_edge = Structure.from_sites(final_access_node_site_list,
validate_proximity=False,
to_unit_cell=False)
else:
new_node_edge = None
return new_node_edge
def plot_images(self, outfile):
"""
Generates a POSCAR with the calculated diffusion path with respect to the first endpoint.
:param outfile: Output file for the POSCAR
"""
sum_struct = self.__images[0].sites
for image in self.__images:
for site_i in self.__relax_sites:
sum_struct.append(PeriodicSite(image.sites[site_i].specie, image.sites[site_i].frac_coords,
self.__images[0].lattice, to_unit_cell=True, coords_are_cartesian=False))
sum_struct = Structure.from_sites(sum_struct, validate_proximity=False)
p = Poscar(sum_struct)
p.write_file(outfile)
def from_dict(cls, d):
lattice = Lattice.from_dict(d["lattice"])
sites = [PeriodicSite.from_dict(sd, lattice) for sd in d["sites"]]
s = Structure.from_sites(sites)
return Slab(
lattice=lattice,
species=s.species_and_occu, coords=s.frac_coords,
miller_index=d["miller_index"],
oriented_unit_cell=Structure.from_dict(d["oriented_unit_cell"]),
shift=d["shift"], scale_factor=d["scale_factor"],
site_properties=s.site_properties, energy=d["energy"]
)
def from_dict(cls, d):
lattice = Lattice.from_dict(d["lattice"])
sites = [PeriodicSite.from_dict(sd, lattice) for sd in d["sites"]]
s = Structure.from_sites(sites)
return Slab(
lattice=lattice,
species=s.species_and_occu, coords=s.frac_coords,
miller_index=d["miller_index"],
oriented_unit_cell=Structure.from_dict(d["oriented_unit_cell"]),
shift=d["shift"], scale_factor=d["scale_factor"],
site_properties=s.site_properties, energy=d["energy"]
)
def add_vacuum_padding(slab, vacuum, hkl=[0,0,1]):
"""
add vacuum spacing to the given structure
Args:
slab: sructure/slab object to be padded
vacuum: in angstroms
hkl: miller index
Returns:
Structure object
"""
min_z = np.min([fcoord[2] for fcoord in slab.frac_coords])
slab.translate_sites(list(range(len(slab))), [0, 0, -min_z])
a, b, c = slab.lattice.matrix
z = [coord[2] for coord in slab.cart_coords]
zmax = np.max(z)
zmin = np.min(z)
thickness = zmax - zmin
new_c = c / np.linalg.norm(c) * (thickness+vacuum)
new_lattice = Lattice(np.array([a,b,new_c]))
new_sites = []
for site in slab:
new_sites.append(PeriodicSite(site.species_and_occu,
site.coords,
new_lattice,
properties=site.properties,
coords_are_cartesian=True))
new_struct = Structure.from_sites(new_sites)
#center the slab
avg_z = np.average([fcoord[2] for fcoord in new_struct.frac_coords])
new_struct.translate_sites(list(range(len(new_struct))),
[0, 0, 0.5 - avg_z])
return Slab(new_struct.lattice,
new_struct.species_and_occu,
new_struct.frac_coords,
hkl,
Structure.from_sites(new_struct,to_unit_cell=True),
shift=0,
scale_factor=np.eye(3, dtype=np.int),
site_properties=new_struct.site_properties)
def plot_images(self, outfile):
"""
Generates a POSCAR with the calculated diffusion path with respect to the first endpoint.
:param outfile: Output file for the POSCAR
"""
sum_struct = self.__images[0].sites
for image in self.__images:
for site_i in self.__relax_sites:
sum_struct.append(PeriodicSite(image.sites[site_i].specie, image.sites[site_i].frac_coords,
self.__images[0].lattice, to_unit_cell=True, coords_are_cartesian=False))
sum_struct = Structure.from_sites(sum_struct, validate_proximity=False)
p = Poscar(sum_struct)
p.write_file(outfile)
def test_structures(self):
import itertools
import numpy as np
from pymatgen.core.structure import Structure
from pymatgen.core.lattice import Lattice
from pymatgen.core.sites import PeriodicSite
from supercellor.supercell import make_supercell
NTESTS = 100 #100
RADIUS = 100.0
EPS = 1e-3
DIAG = 4
NOISE_R = 2
tests_run = 0
np.random.seed(10)
while (tests_run < NTESTS):
R = DIAG * np.eye(3, dtype=int) - np.random.randint(
NOISE_R, size=(3, 3)) + NOISE_R
#np.random.randint(10, size=(3,3)) -5
S = RADIUS * np.eye(3)
try:
P = np.dot(np.linalg.inv(R), S)
except np.linalg.LinAlgError:
continue
lattice = Lattice(P)
if lattice.volume < 0.01 * RADIUS**3 / DIAG:
print('skipping', lattice.volume)
continue
sites = []
try:
for pos in itertools.product([-0.5, 0.5], repeat=3):
sites.append(
PeriodicSite("H",
pos,
lattice,
coords_are_cartesian=True))
except np.linalg.LinAlgError:
continue
structure = Structure.from_sites(sites)
supercell, scale = make_supercell(structure,
distance=RADIUS - EPS,
verbosity=0,
wrap=True,
standardize=True,
do_niggli_first=True)
self.assertTrue(
np.sum(np.abs(supercell._lattice.matrix - S)) < EPS)
tests_run += 1
def test_niggli(self):
from pymatgen.symmetry.analyzer import SpacegroupAnalyzer
from pymatgen.core.structure import Structure
from pymatgen.core.lattice import Lattice
from pymatgen.core.sites import PeriodicSite
from supercellor.supercell import make_supercell
import numpy as np
import itertools
np.random.seed(4)
DIST = 0.99
lattice = Lattice(1 * np.eye(3) + 0.5 *
(np.random.random((3, 3)) - 0.5))
sites = []
for pos in itertools.product([-0.5, 0.5], repeat=3):
sites.append(
PeriodicSite("H", pos, lattice, coords_are_cartesian=True))
structure = Structure.from_sites(sites)
supercell1, scale1 = make_supercell(structure,
distance=DIST,
verbosity=1,
wrap=True,
standardize=True,
do_niggli_first=False)
supercell2, scale2 = make_supercell(structure,
distance=DIST,
verbosity=1,
wrap=True,
standardize=True,
do_niggli_first=True)
sa = SpacegroupAnalyzer(supercell1, symprec=1e-21, angle_tolerance=-1)
supercell_refine = sa.get_refined_structure()
for i in range(3):
for j in range(3):
self.assertTrue(
abs(supercell1._lattice.matrix[i, j] -
supercell2._lattice.matrix[i, j]) < 1e-1,
'{} != {} for i,j={},{}'.format(
supercell1._lattice.matrix[i, j],
supercell2._lattice.matrix[i, j], i, j))
self.assertTrue(
abs(supercell1._lattice.matrix[i, j] -
supercell_refine._lattice.matrix[i, j]) < 1e-1,
'{} != {} for i,j={},{}'.format(
supercell1._lattice.matrix[i, j],
supercell_refine._lattice.matrix[i, j], i, j))
def get_structure_with_only_magnetic_atoms(self, make_primitive=True):
"""
Returns a Structure with only magnetic atoms present.
:return: Structure
"""
sites = [site for site in self.structure if abs(site.properties["magmom"]) > 0]
structure = Structure.from_sites(sites)
if make_primitive:
structure = structure.get_primitive_structure(use_site_props=True)
return structure
def fast_ordering(self, structure, num_remove_dict, num_to_return=1):
"""
This method uses the matrix form of ewaldsum to calculate the ewald
sums of the potential structures. This is on the order of 4 orders of
magnitude faster when there are large numbers of permutations to
consider. There are further optimizations possible (doing a smarter
search of permutations for example), but this wont make a difference
until the number of permutations is on the order of 30,000.
"""
self.logger.debug("Performing fast ordering")
starttime = time.time()
self.logger.debug("Performing initial ewald sum...")
ewaldmatrix = EwaldSummation(structure).total_energy_matrix
self.logger.debug("Ewald sum took {} seconds."
.format(time.time() - starttime))
starttime = time.time()
m_list = []
for indices, num in num_remove_dict.items():
m_list.append([0, num, list(indices), None])
self.logger.debug("Calling EwaldMinimizer...")
minimizer = EwaldMinimizer(ewaldmatrix, m_list, num_to_return,
PartialRemoveSitesTransformation.ALGO_FAST)
self.logger.debug("Minimizing Ewald took {} seconds."
.format(time.time() - starttime))
all_structures = []
lowest_energy = minimizer.output_lists[0][0]
num_atoms = sum(structure.composition.values())
for output in minimizer.output_lists:
s = Structure.from_sites(structure.sites)
del_indices = []
for manipulation in output[1]:
if manipulation[1] is None:
del_indices.append(manipulation[0])
else:
s.replace(manipulation[0], manipulation[1])
s.remove_sites(del_indices)
struct = s.get_sorted_structure()
all_structures.append(
{"energy": output[0],
"energy_above_minimum": (output[0] - lowest_energy)
/ num_atoms,
"structure": struct})
return all_structures
def test_equivalence_fort_py(self):
from datetime import datetime
import itertools
import numpy as np
from pymatgen.core.structure import Structure
from pymatgen.core.lattice import Lattice
from pymatgen.core.sites import PeriodicSite
from supercellor.supercell import make_supercell
NTESTS = 10 #100
VERBOSITY = 0
for radius in np.arange(1.0, 3.1, 1.0):
#RADIUS = 5.0
tests_run = 0
np.random.seed(10) # reinitialize seed!
timings_f = 0.0
timings_p = 0.0
while (tests_run < NTESTS):
P = np.eye(3)+ 0.1*(np.random.random((3,3)) -0.5)
lattice = Lattice(P)
if lattice.volume < 0.1:
print('skipping', lattice.volume)
continue
sites = []
try:
for pos in itertools.product([-0.5,0.5], repeat=3):
sites.append(PeriodicSite("H", pos, lattice, coords_are_cartesian=True))
except np.linalg.LinAlgError:
continue
structure = Structure.from_sites(sites)
n = datetime.now()
supercell_p, scale_p = make_supercell(structure, distance=radius,
verbosity=VERBOSITY, wrap=True, standardize=True, do_niggli_first=True,
implementation='pyth')
timings_p += (datetime.now()-n).microseconds
n = datetime.now()
supercell_f, scale_f = make_supercell(structure, distance=radius,
verbosity=VERBOSITY, wrap=True, standardize=True, do_niggli_first=True,
implementation='fort')
timings_f += (datetime.now()-n).microseconds
self.assertTrue(np.sum((scale_p-scale_f)**2) ==0)
self.assertTrue(np.sum((supercell_f._lattice.matrix -supercell_p._lattice.matrix)**2) < 1e-6)
#~ self.assertTrue(np.sum(np.abs(supercell._lattice.matrix - S))< EPS)
tests_run += 1
print('Avg timing fortran impl rad={} {:.2e}'.format(radius, 1e-6*timings_f/ tests_run))
print('Avg timing python impl rad={} {:.2e}'.format(radius, 1e-6*timings_p/ tests_run))
def vtk(self):
if StructureVis is None:
raise NotImplementedError("vtk must be present to view.")
lattice = self.structure.lattice
vis = StructureVis()
vis.set_structure(Structure.from_sites(self.structure))
for v in self.vnodes:
vis.add_site(PeriodicSite("K", v.frac_coords, lattice))
vis.add_polyhedron(
[PeriodicSite("S", c, lattice, coords_are_cartesian=True) for c in v.polyhedron_coords],
PeriodicSite("Na", v.frac_coords, lattice),
color="element",
draw_edges=True,
edges_color=(0, 0, 0))
vis.show()
def get_structure_with_only_magnetic_atoms(self, make_primitive=True):
"""
Returns a Structure with only magnetic atoms present.
:return: Structure
"""
sites = [site for site in self.structure
if abs(site.properties['magmom']) > 0]
structure = Structure.from_sites(sites)
if make_primitive:
structure = structure.get_primitive_structure(use_site_props=True)
return structure
def write_structures(structures, file_name, format):
import tempfile
import zipfile
from os.path import basename, join
import os
format_name, Writer = format
file_type = format_name
if len(structures) > 1:
result_archive = zipfile.ZipFile(join(os.getcwd(),
basename(file_name) + '.zip'),
mode='w')
for name, structure in structures.items():
sorted_sites = list(
sorted(structure.sites.copy(),
key=lambda site: site.specie.symbol))
sorted_structure = Structure.from_sites(sorted_sites)
with tempfile.NamedTemporaryFile() as tmpfile:
Writer(sorted_structure).write_file(tmpfile.name)
result_archive.write(tmpfile.name,
arcname='{}.{}'.format(name, file_type))
result_archive.close()
write_message('Archive file: {0}'.format(
join(os.getcwd(),
basename(file_name) + '.zip')),
level=DEBUG)
else:
#There is just one file write only that one
structure_key = list(structures.keys())[0]
sorted_sites = list(
sorted(structures[structure_key].sites.copy(),
key=lambda site: site.specie.symbol))
sorted_structure = Structure.from_sites(sorted_sites)
p = Writer(sorted_structure)
fname = join(os.getcwd(), '{}.{}'.format(structure_key, file_type))
p.write_file(fname)
write_message('Output file: {0}'.format(fname), level=DEBUG)
def enumerate_ordering(self, structure):
# Generate the disordered structure first.
s = Structure.from_sites(structure.sites)
for indices, fraction in zip(self._indices, self._fractions):
for ind in indices:
new_sp = {
sp: occu * fraction
for sp, occu in structure[ind].species_and_occu.items()
}
s[ind] = new_sp
# Perform enumeration
from pymatgen.transformations.advanced_transformations import \
EnumerateStructureTransformation
trans = EnumerateStructureTransformation()
return trans.apply_transformation(s, 10000)
def get_sorted_structure(self, key=None, reverse=False) -> Structure:
"""
Get a sorted structure for the interface. The parameters have the same
meaning as in list.sort. By default, sites are sorted by the
electronegativity of the species.
Args:
key: Specifies a function of one argument that is used to extract
a comparison key from each list element: key=str.lower. The
default value is None (compare the elements directly).
reverse (bool): If set to True, then the list elements are sorted
as if each comparison were reversed.
"""
struct_copy = Structure.from_sites(self)
struct_copy.sort(key=key, reverse=reverse)
return struct_copy
def analyze_symmetry(self, tol):
s = Structure.from_sites(self.framework)
site_to_vindex = {}
for i, v in enumerate(self.vnodes):
s.append("Li", v.frac_coords)
site_to_vindex[s[-1]] = i
print(len(s))
finder = SpacegroupAnalyzer(s, tol)
print(finder.get_space_group_operations())
symm_structure = finder.get_symmetrized_structure()
print(len(symm_structure.equivalent_sites))
return [[site_to_vindex[site]
for site in sites]
for sites in symm_structure.equivalent_sites
if sites[0].specie.symbol == "Li"]
def test_offset_vector(self):
interface = self.ib.interfaces[0]
init_lattice = interface.lattice.matrix.copy()
self.assertArrayAlmostEqual(interface.offset_vector,
np.array([0, 0, 2.5]))
init_film = interface.film
init_sub = interface.substrate
tst = Structure.from_sites(interface.sites)
interface.z_shift += 1
self.assertArrayAlmostEqual(interface.offset_vector,
np.array([0, 0, 3.5]))
tdm, idm = tst.distance_matrix, interface.distance_matrix
diff = tdm - idm
assert (tdm <= idm + 1e-10).all()
assert (tdm + 0.5 < idm).any()
self.assertArrayAlmostEqual(init_film.distance_matrix,
interface.film.distance_matrix)
self.assertArrayAlmostEqual(init_sub.distance_matrix,
interface.substrate.distance_matrix)
interface.z_shift -= 1
self.assertArrayAlmostEqual(interface.offset_vector,
np.array([0, 0, 2.5]))
idm = interface.distance_matrix
assert (np.abs(tdm - idm) < 1e-10).all()
interface.ab_shift += np.array([0.2, 0.2])
self.assertArrayAlmostEqual(interface.ab_shift, np.array([0.2, 0.2]))
idm = interface.distance_matrix
assert (np.abs(tdm - idm) > 0.9).any()
self.assertArrayAlmostEqual(init_lattice, interface.lattice.matrix)
self.assertArrayAlmostEqual(init_film.distance_matrix,
interface.film.distance_matrix)
self.assertArrayAlmostEqual(init_sub.distance_matrix,
interface.substrate.distance_matrix)
interface.ab_shift -= np.array([0.2, 0.2])
self.assertArrayAlmostEqual(interface.offset_vector,
np.array([0, 0, 2.5]))
idm = interface.distance_matrix
assert (np.abs(tdm - idm) < 1e-10).all()
self.assertArrayAlmostEqual(init_film.distance_matrix,
interface.film.distance_matrix)
self.assertArrayAlmostEqual(init_sub.distance_matrix,
interface.substrate.distance_matrix)
def write_input(self, output_dir, make_dir_if_not_present=True,
write_cif=False, write_path_cif=False,
write_endpoint_inputs=False):
"""
NEB inputs has a special directory structure where inputs are in 00,
01, 02, ....
Args:
output_dir (str): Directory to output the VASP input files
make_dir_if_not_present (bool): Set to True if you want the
directory (and the whole path) to be created if it is not
present.
write_cif (bool): If true, writes a cif along with each POSCAR.
write_path_cif (bool): If true, writes a cif for each image.
write_endpoint_inputs (bool): If true, writes input files for
running endpoint calculations.
"""
if make_dir_if_not_present and not os.path.exists(output_dir):
os.makedirs(output_dir)
self.incar.write_file(os.path.join(output_dir, 'INCAR'))
self.kpoints.write_file(os.path.join(output_dir, 'KPOINTS'))
self.potcar.write_file(os.path.join(output_dir, 'POTCAR'))
for i, p in enumerate(self.poscars):
d = os.path.join(output_dir, str(i).zfill(2))
if not os.path.exists(d):
os.makedirs(d)
p.write_file(os.path.join(d, 'POSCAR'))
if write_cif:
p.structure.to(filename=os.path.join(d, '{}.cif'.format(i)))
if write_endpoint_inputs:
end_point_param = MPRelaxSet(
self.structures[0],
user_incar_settings=self.user_incar_settings)
for image in ['00', str(len(self.structures) - 1).zfill(2)]:
end_point_param.incar.write_file(os.path.join(output_dir, image, 'INCAR'))
end_point_param.kpoints.write_file(os.path.join(output_dir, image, 'KPOINTS'))
end_point_param.potcar.write_file(os.path.join(output_dir, image, 'POTCAR'))
if write_path_cif:
sites = set()
l = self.structures[0].lattice
for site in chain(*(s.sites for s in self.structures)):
sites.add(PeriodicSite(site.species_and_occu, site.frac_coords, l))
path = Structure.from_sites(sorted(sites))
path.to(filename=os.path.join(output_dir, 'path.cif'))
def write_input(self, output_dir, make_dir_if_not_present=True,
write_cif=False, write_path_cif=False,
write_endpoint_inputs=False):
"""
NEB inputs has a special directory structure where inputs are in 00,
01, 02, ....
Args:
output_dir (str): Directory to output the VASP input files
make_dir_if_not_present (bool): Set to True if you want the
directory (and the whole path) to be created if it is not
present.
write_cif (bool): If true, writes a cif along with each POSCAR.
write_path_cif (bool): If true, writes a cif for each image.
write_endpoint_inputs (bool): If true, writes input files for
running endpoint calculations.
"""
if make_dir_if_not_present and not os.path.exists(output_dir):
os.makedirs(output_dir)
self.incar.write_file(os.path.join(output_dir, 'INCAR'))
self.kpoints.write_file(os.path.join(output_dir, 'KPOINTS'))
self.potcar.write_file(os.path.join(output_dir, 'POTCAR'))
for i, p in enumerate(self.poscars):
d = os.path.join(output_dir, str(i).zfill(2))
if not os.path.exists(d):
os.makedirs(d)
p.write_file(os.path.join(d, 'POSCAR'))
if write_cif:
p.structure.to(filename=os.path.join(d, '{}.cif'.format(i)))
if write_endpoint_inputs:
end_point_param = MPRelaxSet(
self.structures[0],
user_incar_settings=self.user_incar_settings)
for image in ['00', str(len(self.structures) - 1).zfill(2)]:
end_point_param.incar.write_file(os.path.join(output_dir, image, 'INCAR'))
end_point_param.kpoints.write_file(os.path.join(output_dir, image, 'KPOINTS'))
end_point_param.potcar.write_file(os.path.join(output_dir, image, 'POTCAR'))
if write_path_cif:
sites = set()
l = self.structures[0].lattice
for site in chain(*(s.sites for s in self.structures)):
sites.add(PeriodicSite(site.species_and_occu, site.frac_coords, l))
path = Structure.from_sites(sorted(sites))
path.to(filename=os.path.join(output_dir, 'path.cif'))
def get_s2_like_s1(self, struct1, struct2):
"""
Performs transformations on struct2 to put it in a basis similar to
struct1 (without changing any of the inter-site distances)
"""
if self._primitive_cell:
raise ValueError("get_s2_like_s1 cannot be used with the primitive"
" cell option")
s1, s2, fu, s1_supercell = self._preprocess(struct1, struct2, False)
ratio = fu if s1_supercell else 1/fu
if s1_supercell and fu > 1:
raise ValueError("Struct1 must be the supercell, "
"not the other way around")
if len(s1) * ratio >= len(s2):
#s1 is superset
match = self._match(s1, s2, fu=fu, s1_supercell=s1_supercell,
use_rms=True, break_on_match=False)
else:
#s2 is superset
match = self._match(s2, s1, fu=fu, s1_supercell=(not s1_supercell),
use_rms=True, break_on_match=False)
if match is None:
return None
temp = struct2.copy()
temp.make_supercell(match[2])
if len(struct1) >= len(temp):
#invert the mapping, since it needs to be from s2 to s1
mapping = np.argsort(match[4])
tvec = match[3]
else:
#add sites not included in the mapping
not_included = range(len(temp))
for i in match[4]:
not_included.remove(i)
mapping = list(match[4]) + not_included
tvec = -match[3]
temp.translate_sites(range(len(temp)), tvec)
return Structure.from_sites([temp.sites[i] for i in mapping])
def get_oxi_state_decorated_structure(self, structure):
"""
Get an oxidation state decorated structure. This currently works only
for ordered structures only.
Args:
structure: Structure to analyze
Returns:
A modified structure that is oxidation state decorated.
Raises:
ValueError if the valences cannot be determined.
"""
valences = self.get_valences(structure)
s = Structure.from_sites(structure.sites)
s.add_oxidation_state_by_site(valences)
return s
def get_structure_with_only_magnetic_atoms(self, make_primitive: bool = True) -> Structure:
"""Returns a Structure with only magnetic atoms present.
Args:
make_primitive: Whether to make structure primitive after
removing non-magnetic atoms (Default value = True)
Returns: Structure
"""
sites = [site for site in self.structure if abs(site.properties["magmom"]) > 0]
structure = Structure.from_sites(sites)
if make_primitive:
structure = structure.get_primitive_structure(use_site_props=True)
return structure
def label_termination(slab: Structure) -> str:
"""Labels the slab surface termination"""
frac_coords = slab.frac_coords
n = len(frac_coords)
if n == 1:
# Clustering does not work when there is only one data point.
form = slab.composition.reduced_formula
sp_symbol = SpacegroupAnalyzer(slab,
symprec=0.1).get_space_group_symbol()
return f"{form}_{sp_symbol}_{len(slab)}"
dist_matrix = np.zeros((n, n))
h = slab.lattice.c
# Projection of c lattice vector in
# direction of surface normal.
for i, j in combinations(list(range(n)), 2):
if i != j:
cdist = frac_coords[i][2] - frac_coords[j][2]
cdist = abs(cdist - round(cdist)) * h
dist_matrix[i, j] = cdist
dist_matrix[j, i] = cdist
condensed_m = squareform(dist_matrix)
z = linkage(condensed_m)
clusters = fcluster(z, 0.25, criterion="distance")
clustered_sites: dict[int, list[Site]] = {c: [] for c in clusters}
for i, c in enumerate(clusters):
clustered_sites[c].append(slab[i])
plane_heights = {
np.average(np.mod([s.frac_coords[2] for s in sites], 1)): c
for c, sites in clustered_sites.items()
}
top_plane_cluster = sorted(plane_heights.items(),
key=lambda x: x[0])[-1][1]
top_plane_sites = clustered_sites[top_plane_cluster]
top_plane = Structure.from_sites(top_plane_sites)
sp_symbol = SpacegroupAnalyzer(top_plane,
symprec=0.1).get_space_group_symbol()
form = top_plane.composition.reduced_formula
return f"{form}_{sp_symbol}_{len(top_plane)}"
def __init__(self,
structure,
scaling_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1))):
"""
Create a supercell.
Args:
structure:
pymatgen.core.structure Structure object.
scaling_matrix:
a matrix of transforming the lattice vectors. Defaults to the
identity matrix. Has to be all integers. e.g.,
[[2,1,0],[0,3,0],[0,0,1]] generates a new structure with
lattice vectors a' = 2a + b, b' = 3b, c' = c where a, b, and c
are the lattice vectors of the original structure.
"""
self._original_structure = structure
old_lattice = structure.lattice
scale_matrix = np.array(scaling_matrix)
new_lattice = Lattice(np.dot(scale_matrix, old_lattice.matrix))
new_sites = []
def range_vec(i):
return range(
max(scale_matrix[:][:, i]) - min(scale_matrix[:][:, i]) + 1)
for site in structure.sites:
for (i, j, k) in itertools.product(range_vec(0), range_vec(1),
range_vec(2)):
fcoords = site.frac_coords + np.array([i, j, k])
coords = old_lattice.get_cartesian_coords(fcoords)
new_coords = new_lattice.get_fractional_coords(coords)
new_site = PeriodicSite(site.species_and_occu,
new_coords,
new_lattice,
properties=site.properties)
contains_site = False
for s in new_sites:
if s.is_periodic_image(new_site):
contains_site = True
break
if not contains_site:
new_sites.append(new_site)
self._modified_structure = Structure.from_sites(new_sites)
def get_oxi_state_decorated_structure(self, structure):
"""
Get an oxidation state decorated structure. This currently works only
for ordered structures only.
Args:
structure:
Structure to analyze
Returns:
A modified structure that is oxidation state decorated.
Raises:
A ValueError is the valences cannot be determined.
"""
valences = self.get_valences(structure)
s = Structure.from_sites(structure.sites)
s.add_oxidation_state_by_site(valences)
return s
def get_sorted_structure(self, key=None, reverse=False):
"""
Get a sorted copy of the structure. The parameters have the same
meaning as in list.sort. By default, sites are sorted by the
electronegativity of the species. Note that Slab has to override this
because of the different __init__ args.
Args:
key: Specifies a function of one argument that is used to extract
a comparison key from each list element: key=str.lower. The
default value is None (compare the elements directly).
reverse (bool): If set to True, then the list elements are sorted
as if each comparison were reversed.
"""
sites = sorted(self, key=key, reverse=reverse)
s = Structure.from_sites(sites)
return Slab(s.lattice, s.species_and_occu, s.frac_coords,
self.miller_index, self.oriented_unit_cell, self.shift,
self.scale_factor, site_properties=s.site_properties)
def get_reconstructed_structure(components: List[Component],
simplify_molecules: bool = True) -> Structure:
"""Reconstructs a structure from a list of components.
Has the option to simplify molecular components into a single site
positioned at the centre of mass of the molecular. If using this option,
the components must have been generated with ``inc_molecule_graph=True``.
Args:
components: A list of structure components, generated using
:obj:`pymatgen.analysis.dimensionality.get_structure_components`,
with ``inc_molecule_graph=True``.
simplify_molecules: Whether to simplify the molecular components into
a single site positioned at the centre of mass of the molecule.
Returns:
The reconstructed structure.
"""
mol_sites = []
other_sites = []
if simplify_molecules:
mol_components, components = filter_molecular_components(components)
if mol_components:
lattice = mol_components[0]["structure_graph"].structure.lattice
mol_sites = [
PeriodicSite(
c["structure_graph"].structure[0].specie,
c["molecule_graph"].molecule.center_of_mass,
lattice,
coords_are_cartesian=True,
) for c in mol_components
]
if components:
other_sites = [
site for c in components for site in c["structure_graph"].structure
]
return Structure.from_sites(other_sites + mol_sites)
def test_hnf_dmpi(self):
import json, numpy as np, itertools, os
from pymatgen.core.structure import Structure
from pymatgen.core.lattice import Lattice
from pymatgen.core.sites import PeriodicSite
from supercellor.supercell import make_supercell
np.random.seed(50)
N = 1
RMIN = 2
RMAX = 3
for trial in range(N):
#~ for implementation in ('pyth', ):
for implementation in ('fort', ):
lattice = Lattice(1.0 * np.eye(3) + 0.2 *
(np.random.random((3, 3)) - 0.5))
sites = []
for pos in itertools.product([-0.5, 0.5], repeat=3):
sites.append(
PeriodicSite("H",
pos,
lattice,
coords_are_cartesian=True))
structure = Structure.from_sites(sites)
for rad in range(RMIN, RMAX):
supercell1, scale1 = make_supercell(
structure,
distance=rad,
method='hnf',
implementation=implementation,
verbosity=0,
wrap=True,
standardize=False,
do_niggli_first=False)
reduced_supercell1 = supercell1.get_reduced_structure(
reduction_algo=u'LLL')
for dim in range(3):
self.assertTrue(
np.linalg.norm(reduced_supercell1._lattice.
matrix[dim]) >= rad)
def slab_from_file(hkl, filename):
"""
reads in structure from the file and returns slab object.
useful for reading in 2d/substrate structures from file.
Args:
hkl: miller index of the slab in the input file.
filename: structure file in any format
supported by pymatgen
Returns:
Slab object
"""
slab_input = Structure.from_file(filename)
return Slab(slab_input.lattice,
slab_input.species_and_occu,
slab_input.frac_coords,
hkl,
Structure.from_sites(slab_input, to_unit_cell=True),
shift=0,
scale_factor=np.eye(3, dtype=np.int),
site_properties=slab_input.site_properties)
def best_first_ordering(self, structure, num_remove_dict):
self.logger.debug("Performing best first ordering")
starttime = time.time()
self.logger.debug("Performing initial ewald sum...")
ewaldsum = EwaldSummation(structure)
self.logger.debug("Ewald sum took {} seconds.".format(time.time() -
starttime))
starttime = time.time()
ematrix = ewaldsum.total_energy_matrix
to_delete = []
totalremovals = sum(num_remove_dict.values())
removed = {k: 0 for k in num_remove_dict.keys()}
for i in xrange(totalremovals):
maxindex = None
maxe = float("-inf")
maxindices = None
for indices in num_remove_dict.keys():
if removed[indices] < num_remove_dict[indices]:
for ind in indices:
if ind not in to_delete:
energy = sum(ematrix[:, ind]) + \
sum(ematrix[:, ind]) - ematrix[ind, ind]
if energy > maxe:
maxindex = ind
maxe = energy
maxindices = indices
removed[maxindices] += 1
to_delete.append(maxindex)
ematrix[:, maxindex] = 0
ematrix[maxindex, :] = 0
s = Structure.from_sites(structure.sites)
s.remove_sites(to_delete)
self.logger.debug(
"Minimizing Ewald took {} seconds.".format(time.time() -
starttime))
return [{
"energy": sum(sum(ematrix)),
"structure": s.get_sorted_structure()
}]
def from_dict(cls, d):
"""
:param d: dict
:return: Creates slab from dict.
"""
lattice = Lattice.from_dict(d["lattice"])
sites = [PeriodicSite.from_dict(sd, lattice) for sd in d["sites"]]
s = Structure.from_sites(sites)
optional = dict(
in_plane_offset=d.get("in_plane_offset"),
gap=d.get("gap"),
vacuum_over_film=d.get("vacuum_over_film"),
interface_properties=d.get("interface_properties"),
)
return Interface(
lattice=lattice,
species=s.species_and_occu,
coords=s.frac_coords,
site_properties=s.site_properties,
**{k: v
for k, v in optional.items() if v is not None},
)
def __str__(self):
"""
Sorts a Structure (by fractional co-ordinate), and
prints sites with magnetic information. This is
useful over Structure.__str__ because sites are in
a consistent order, which makes visual comparison between
two identical Structures with different magnetic orderings
easier.
"""
frac_coords = self.structure.frac_coords
sorted_indices = np.lexsort((frac_coords[:, 2], frac_coords[:, 1], frac_coords[:, 0]))
s = Structure.from_sites([self.structure[idx] for idx in sorted_indices])
# adapted from Structure.__repr__
outs = ["Structure Summary", repr(s.lattice)]
outs.append("Magmoms Sites")
for site in s:
if site.properties["magmom"] != 0:
prefix = "{:+.2f} ".format(site.properties["magmom"])
else:
prefix = " "
outs.append(prefix + repr(site))
return "\n".join(outs)
def from_dict(cls, d):
"""
:param d: Dict representation
:return: Interface
"""
lattice = Lattice.from_dict(d["lattice"])
sites = [PeriodicSite.from_dict(sd, lattice) for sd in d["sites"]]
s = Structure.from_sites(sites)
return Interface(
lattice=lattice,
species=s.species_and_occu,
coords=s.frac_coords,
sub_plane=d["sub_plane"],
film_plane=d["film_plane"],
sub_init_cell=d["sub_init_cell"],
film_init_cell=d["film_init_cell"],
modified_sub_structure=d["modified_sub_structure"],
modified_film_structure=d["modified_film_structure"],
strained_sub_structure=d["strained_sub_structure"],
strained_film_structure=d["strained_film_structure"],
site_properties=s.site_properties,
init_inplane_shift=d["init_inplane_shift"],
)
def copy(self):
return Structure.from_sites(self)
def vac_antisite_def_struct_gen(mpid, mapi_key, cellmax, struct_file=None):
if not mpid and not struct_file:
print ("============\nERROR: Provide an mpid\n============")
return
# Get primitive structure from the Materials Project DB
if not struct_file:
if not mapi_key:
with MPRester() as mp:
struct = mp.get_structure_by_material_id(mpid)
else:
with MPRester(mapi_key) as mp:
struct = mp.get_structure_by_material_id(mpid)
else:
struct = Structure.from_file(struct_file)
sga = SpacegroupAnalyzer(struct)
prim_struct = sga.find_primitive()
#prim_struct_sites = len(prim_struct.sites)
#conv_struct = sga.get_conventional_standard_structure()
#conv_struct_sites = len(conv_struct.sites)
#conv_prim_ratio = int(conv_struct_sites / prim_struct_sites)
# Default VASP settings
def_vasp_incar_param = {'ISIF':2, 'EDIFF':1e-6, 'EDIFFG':0.001,}
kpoint_den = 15000
# Create bulk structure and associated VASP files
sc_scale = get_sc_scale(inp_struct=prim_struct, final_site_no=cellmax)
blk_sc = prim_struct.copy()
blk_sc.make_supercell(scaling_matrix=sc_scale)
site_no = blk_sc.num_sites
# Rescale if needed
while site_no > cellmax:
max_sc_dim = max(sc_scale)
i = sc_scale.index(max_sc_dim)
sc_scale[i] -= 1
blk_sc = prim_struct.copy()
blk_sc.make_supercell(scaling_matrix=sc_scale)
site_no = blk_sc.num_sites
blk_str_sites = set(blk_sc.sites)
custom_kpoints = Kpoints.automatic_density(blk_sc, kppa=kpoint_den)
mpvis = MPMetalRelaxSet(blk_sc, user_incar_settings=def_vasp_incar_param,
user_kpoints_settings=custom_kpoints)
if mpid:
root_fldr = mpid
else:
root_fldr = struct.composition.reduced_formula
fin_dir = os.path.join(root_fldr, 'bulk')
mpvis.write_input(fin_dir)
if not mpid: # write the input structure if mpid is not used
struct.to(fmt='poscar', filename=os.path.join(fin_dir, 'POSCAR.uc'))
# Create each defect structure and associated VASP files
# First find all unique defect sites
periodic_struct = sga.get_symmetrized_structure()
unique_sites = list(set([periodic_struct.find_equivalent_sites(site)[0] \
for site in periodic_struct.sites]))
temp_struct = Structure.from_sites(sorted(unique_sites))
prim_struct2 = SpacegroupAnalyzer(temp_struct).find_primitive()
prim_struct2.lattice = prim_struct.lattice # a little hacky
for i, site in enumerate(prim_struct2.sites):
vac = Vacancy(structure=prim_struct, defect_site=site)
vac_sc = vac.generate_defect_structure(supercell=sc_scale)
# Get vacancy site information
vac_str_sites = set(vac_sc.sites)
vac_sites = blk_str_sites - vac_str_sites
vac_site = next(iter(vac_sites))
site_mult = vac.get_multiplicity()
vac_site_specie = vac_site.specie
vac_symbol = vac_site_specie.symbol
custom_kpoints = Kpoints.automatic_density(vac_sc, kppa=kpoint_den)
mpvis = MPMetalRelaxSet(vac_sc,
user_incar_settings=def_vasp_incar_param,
user_kpoints_settings=custom_kpoints)
vac_dir = 'vacancy_{}_mult-{}_sitespecie-{}'.format(
str(i+1), site_mult, vac_symbol)
fin_dir = os.path.join(root_fldr, vac_dir)
mpvis.write_input(fin_dir)
# Antisites generation at the vacancy site
struct_species = blk_sc.species
for specie in set(struct_species) - set([vac_site_specie]):
specie_symbol = specie.symbol
anti_sc = vac_sc.copy()
anti_sc.append(specie, vac_site.frac_coords)
mpvis = MPMetalRelaxSet(anti_sc,
user_incar_settings=def_vasp_incar_param,
user_kpoints_settings=custom_kpoints)
anti_dir = 'antisite_{}_mult-{}_sitespecie-{}_subspecie-{}'.format(
str(i+1), site_mult, vac_symbol, specie_symbol)
fin_dir = os.path.join(root_fldr, anti_dir)
mpvis.write_input(fin_dir)
def set_structure(self, structure, reset_camera=True):
"""
Add a structure to the visualizer.
Args:
structure:
structure to visualize
reset_camera:
Set to True to reset the camera to a default determined based
on the structure.
"""
self.ren.RemoveAllViewProps()
has_lattice = hasattr(structure, "lattice")
if has_lattice:
s = Structure.from_sites(structure, to_unit_cell=True)
s.make_supercell(self.supercell)
else:
s = structure
inc_coords = []
for site in s:
self.add_site(site)
inc_coords.append(site.coords)
count = 0
labels = ["a", "b", "c"]
colors = [(1, 0, 0), (0, 1, 0), (0, 0, 1)]
if has_lattice:
matrix = s.lattice.matrix
if self.show_unit_cell and has_lattice:
#matrix = s.lattice.matrix
self.add_text([0, 0, 0], "o")
for vec in matrix:
self.add_line((0, 0, 0), vec, colors[count])
self.add_text(vec, labels[count], colors[count])
count += 1
for (vec1, vec2) in itertools.permutations(matrix, 2):
self.add_line(vec1, vec1 + vec2)
for (vec1, vec2, vec3) in itertools.permutations(matrix, 3):
self.add_line(vec1 + vec2, vec1 + vec2 + vec3)
if self.show_bonds or self.show_polyhedron:
elements = sorted(s.composition.elements, key=lambda a: a.X)
anion = elements[-1]
def contains_anion(site):
for sp in site.species_and_occu.keys():
if sp.symbol == anion.symbol:
return True
return False
anion_radius = anion.average_ionic_radius
for site in s:
exclude = False
max_radius = 0
color = np.array([0, 0, 0])
for sp, occu in site.species_and_occu.items():
if sp.symbol in self.excluded_bonding_elements \
or sp == anion:
exclude = True
break
max_radius = max(max_radius, sp.average_ionic_radius)
color = color + \
occu * np.array(self.el_color_mapping.get(sp.symbol,
[0, 0, 0]))
if not exclude:
max_radius = (1 + self.poly_radii_tol_factor) * \
(max_radius + anion_radius)
nn = structure.get_neighbors(site, max_radius)
nn_sites = []
for nnsite, dist in nn:
if contains_anion(nnsite):
nn_sites.append(nnsite)
if not in_coord_list(inc_coords, nnsite.coords):
self.add_site(nnsite)
if self.show_bonds:
self.add_bonds(nn_sites, site)
if self.show_polyhedron:
color = [i / 255 for i in color]
self.add_polyhedron(nn_sites, site, color)
if self.show_help:
self.helptxt_actor = vtk.vtkActor2D()
self.helptxt_actor.VisibilityOn()
self.helptxt_actor.SetMapper(self.helptxt_mapper)
self.ren.AddActor(self.helptxt_actor)
self.display_help()
camera = self.ren.GetActiveCamera()
if reset_camera:
if has_lattice:
#Adjust the camera for best viewing
lengths = s.lattice.abc
pos = (matrix[1] + matrix[2]) * 0.5 + \
matrix[0] * max(lengths) / lengths[0] * 3.5
camera.SetPosition(pos)
camera.SetViewUp(matrix[2])
camera.SetFocalPoint((matrix[0] + matrix[1] + matrix[2]) * 0.5)
else:
origin = s.center_of_mass
max_site = max(
s, key=lambda site: site.distance_from_point(origin))
camera.SetPosition(origin + 5 * (max_site.coords - origin))
camera.SetFocalPoint(s.center_of_mass)
self.structure = structure
self.title = s.composition.formula
def __init__(self,
initial_structure,
miller_index,
min_slab_size,
min_vacuum_size,
lll_reduce=False,
center_slab=False,
primitive=True,
max_normal_search=None):
"""
Calculates the slab scale factor and uses it to generate a unit cell
of the initial structure that has been oriented by its miller index.
Also stores the initial information needed later on to generate a slab.
Args:
initial_structure (Structure): Initial input structure. Note that to
ensure that the miller indices correspond to usual
crystallographic definitions, you should supply a conventional
unit cell structure.
miller_index ([h, k, l]): Miller index of plane parallel to
surface. Note that this is referenced to the input structure. If
you need this to be based on the conventional cell,
you should supply the conventional structure.
min_slab_size (float): In Angstroms
min_vac_size (float): In Angstroms
lll_reduce (bool): Whether to perform an LLL reduction on the
eventual structure.
center_slab (bool): Whether to center the slab in the cell with
equal vacuum spacing from the top and bottom.
primitive (bool): Whether to reduce any generated slabs to a
primitive cell (this does **not** mean the slab is generated
from a primitive cell, it simply means that after slab
generation, we attempt to find shorter lattice vectors,
which lead to less surface area and smaller cells).
max_normal_search (int): If set to a positive integer, the code will
conduct a search for a normal lattice vector that is as
perpendicular to the surface as possible by considering
multiples linear combinations of lattice vectors up to
max_normal_search. This has no bearing on surface energies,
but may be useful as a preliminary step to generating slabs
for absorption and other sizes. It is typical that this will
not be the smallest possible cell for simulation. Normality
is not guaranteed, but the oriented cell will have the c
vector as normal as possible (within the search range) to the
surface. A value of up to the max absolute Miller index is
usually sufficient.
"""
latt = initial_structure.lattice
miller_index = reduce_vector(miller_index)
#Calculate the surface normal using the reciprocal lattice vector.
recp = latt.reciprocal_lattice_crystallographic
normal = recp.get_cartesian_coords(miller_index)
normal /= np.linalg.norm(normal)
slab_scale_factor = []
non_orth_ind = []
eye = np.eye(3, dtype=np.int)
for i, j in enumerate(miller_index):
if j == 0:
# Lattice vector is perpendicular to surface normal, i.e.,
# in plane of surface. We will simply choose this lattice
# vector as one of the basis vectors.
slab_scale_factor.append(eye[i])
else:
#Calculate projection of lattice vector onto surface normal.
d = abs(np.dot(normal, latt.matrix[i])) / latt.abc[i]
non_orth_ind.append((i, d))
# We want the vector that has maximum magnitude in the
# direction of the surface normal as the c-direction.
# Results in a more "orthogonal" unit cell.
c_index, dist = max(non_orth_ind, key=lambda t: t[1])
if len(non_orth_ind) > 1:
lcm_miller = lcm(*[miller_index[i] for i, d in non_orth_ind])
for (i, di), (j, dj) in itertools.combinations(non_orth_ind, 2):
l = [0, 0, 0]
l[i] = -int(round(lcm_miller / miller_index[i]))
l[j] = int(round(lcm_miller / miller_index[j]))
slab_scale_factor.append(l)
if len(slab_scale_factor) == 2:
break
if max_normal_search is None:
slab_scale_factor.append(eye[c_index])
else:
index_range = sorted(reversed(
range(-max_normal_search, max_normal_search + 1)),
key=lambda x: abs(x))
candidates = []
for uvw in itertools.product(index_range, index_range,
index_range):
if (not any(uvw)) or abs(
np.linalg.det(slab_scale_factor + [uvw])) < 1e-8:
continue
vec = latt.get_cartesian_coords(uvw)
l = np.linalg.norm(vec)
cosine = abs(np.dot(vec, normal) / l)
candidates.append((uvw, cosine, l))
if abs(abs(cosine) - 1) < 1e-8:
# If cosine of 1 is found, no need to search further.
break
# We want the indices with the maximum absolute cosine,
# but smallest possible length.
uvw, cosine, l = max(candidates, key=lambda x: (x[1], -l))
slab_scale_factor.append(uvw)
slab_scale_factor = np.array(slab_scale_factor)
# Let's make sure we have a left-handed crystallographic system
if np.linalg.det(slab_scale_factor) < 0:
slab_scale_factor *= -1
# Make sure the slab_scale_factor is reduced to avoid
# unnecessarily large slabs
reduced_scale_factor = [reduce_vector(v) for v in slab_scale_factor]
slab_scale_factor = np.array(reduced_scale_factor)
single = initial_structure.copy()
single.make_supercell(slab_scale_factor)
self.oriented_unit_cell = Structure.from_sites(single,
to_unit_cell=True)
self.parent = initial_structure
self.lll_reduce = lll_reduce
self.center_slab = center_slab
self.slab_scale_factor = slab_scale_factor
self.miller_index = miller_index
self.min_vac_size = min_vacuum_size
self.min_slab_size = min_slab_size
self.primitive = primitive
self._normal = normal
a, b, c = self.oriented_unit_cell.lattice.matrix
self._proj_height = abs(np.dot(normal, c))
def _get_structures(self, num_structs):
structs = []
if ".py" in makestr_cmd:
options = ["-input", "struct_enum.out", str(1), str(num_structs)]
else:
options = ["struct_enum.out", str(0), str(num_structs - 1)]
rs = subprocess.Popen([makestr_cmd] + options,
stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
close_fds=True)
stdout, stderr = rs.communicate()
if stderr:
logger.warning(stderr.decode())
# sites retrieved from enumlib will lack site properties
# to ensure consistency, we keep track of what site properties
# are missing and set them to None
# TODO: improve this by mapping ordered structure to original
# disorded structure, and retrieving correct site properties
disordered_site_properties = {}
if len(self.ordered_sites) > 0:
original_latt = self.ordered_sites[0].lattice
# Need to strip sites of site_properties, which would otherwise
# result in an index error. Hence Structure is reconstructed in
# the next step.
site_properties = {}
for site in self.ordered_sites:
for k, v in site.properties.items():
disordered_site_properties[k] = None
if k in site_properties:
site_properties[k].append(v)
else:
site_properties[k] = [v]
ordered_structure = Structure(
original_latt, [site.species for site in self.ordered_sites],
[site.frac_coords for site in self.ordered_sites],
site_properties=site_properties)
inv_org_latt = np.linalg.inv(original_latt.matrix)
for file in glob.glob('vasp.*'):
with open(file) as f:
data = f.read()
data = re.sub(r'scale factor', "1", data)
data = re.sub(r'(\d+)-(\d+)', r'\1 -\2', data)
poscar = Poscar.from_string(data, self.index_species)
sub_structure = poscar.structure
# Enumeration may have resulted in a super lattice. We need to
# find the mapping from the new lattice to the old lattice, and
# perform supercell construction if necessary.
new_latt = sub_structure.lattice
sites = []
if len(self.ordered_sites) > 0:
transformation = np.dot(new_latt.matrix, inv_org_latt)
transformation = [[int(round(cell)) for cell in row]
for row in transformation]
logger.debug("Supercell matrix: {}".format(transformation))
s = ordered_structure * transformation
sites.extend([site.to_unit_cell() for site in s])
super_latt = sites[-1].lattice
else:
super_latt = new_latt
for site in sub_structure:
if site.specie.symbol != "X": # We exclude vacancies.
sites.append(
PeriodicSite(
site.species,
site.frac_coords,
super_latt,
to_unit_cell=True,
properties=disordered_site_properties))
else:
logger.debug("Skipping sites that include species X.")
structs.append(Structure.from_sites(sorted(sites)))
logger.debug("Read in a total of {} structures.".format(num_structs))
return structs
def get_sg_info(ss):
finder = SpacegroupAnalyzer(Structure.from_sites(ss),
self.symm_prec)
return finder.get_space_group_number()