def is_dihedral(self):
""" Whether or not the reflection is a sigma_d
"""
if self.principal_reflection:
return False
for atom in self.molecule:
# If there's an atom in the plane, it's a sigma_v. If there's an atom in the direction of the normal (or it's negative),
# it's sigma_v. Otherwise, it's a sigma_d. If the atom is at the origin, ignore it.
if atom.pos.is_zero():
continue
elif SymmetryOperation.is_same_axis(self.axis, atom.pos):
return False
elif SymmetryOperation.is_perpendicular(self.axis, atom.pos):
return False
return True
def is_dihedral(self):
""" Whether or not the reflection is a sigma_d
"""
if self.principal_reflection:
return False
for atom in self.molecule:
# If there's an atom in the plane, it's a sigma_v. If there's an atom in the direction of the normal (or it's negative),
# it's sigma_v. Otherwise, it's a sigma_d. If the atom is at the origin, ignore it.
if atom.pos.is_zero():
continue
elif SymmetryOperation.is_same_axis(self.axis, atom.pos):
return False
elif SymmetryOperation.is_perpendicular(self.axis, atom.pos):
return False
return True
def check_improper_rotation(atoms,
vector,
angle,
center,
n,
result,
order_no=0):
a = atoms.copy()
a.rotate(vector, a=angle, center=center)
positions = mirror_through_plane(a, vector)
equals = get_equals(atoms, positions)
on = order_no
# n = 2 is equal with inversion operator
if n == 2 or (float(order_no + 1) / float(n)) == 0.5:
return
if equals != None:
operation_name = "S%i" % n
while order_no > 0:
operation_name += "'"
order_no -= 1
result.append(
SymmetryOperation(operation_name,
equals,
None,
vector=vector,
magnitude=n,
type='S',
order_no=on))
def check_mirror(atoms, normal_vector, debug=False):
com = atoms.get_center_of_mass()
# normalize vector
L = numpy.linalg.norm(normal_vector)
normal_vector /= L
mirrored = mirror_through_plane(atoms, normal_vector, debug=debug)
if debug:
print normal_vector
print atoms.get_positions()
print mirrored
from ice_package.help_methods import get_oxygens
import ase
ase.visualize.view(get_oxygens(mirrored))
ase.visualize.view(atoms)
print normal_vector
raw_input("Continue")
result = get_equals(atoms, mirrored, debug=debug)
if result == None:
return None
return SymmetryOperation('sigma',
result,
None,
vector=normal_vector,
magnitude=1,
order_no=0,
type='sigma')
def element_with_matrix(self, mat):
""" Returns the element that has the matrix `mat` in the group `self`.
Raises a `GroupTheoryError` indicating the group is not closed if no such element is found.
"""
for op in self:
if SymmetryOperation.is_same_matrix(op.matrix, mat):
return op
mat_list = [str(op.matrix) for op in sorted(self, key=lambda o: (o.matrix-mat).norm())]
raise GroupTheoryError("Group not closed: In group with elements: \n[" + ", ".join(str(el) for el in self)
+ "],\n Could not find element with the following matrix:\n"
+ str(mat) + " in list (" + str(len(mat_list))
+ " operations total):\n" + ",\n".join(mat_list))
def check_inversion_center(atoms):
positions = positions_related_to_center_of_mass(atoms,
atoms.get_positions())
positions = -positions + atoms.get_center_of_mass()
result = get_equals(atoms, positions)
if result == None:
return None
print "Inversion center found"
return SymmetryOperation("i",
result,
None,
type='i',
order_no=0,
magnitude=1)
def element_with_matrix(self, mat):
""" Returns the element that has the matrix `mat` in the group `self`.
Raises a `GroupTheoryError` indicating the group is not closed if no such element is found.
"""
for op in self:
if SymmetryOperation.is_same_matrix(op.matrix, mat):
return op
mat_list = [
str(op.matrix)
for op in sorted(self, key=lambda o: (o.matrix - mat).norm())
]
raise GroupTheoryError(
"Group not closed: In group with elements: \n[" +
", ".join(str(el) for el in self) +
"],\n Could not find element with the following matrix:\n" +
str(mat) + " in list (" + str(len(mat_list)) +
" operations total):\n" + ",\n".join(mat_list))
def check_single_rotation(atoms, vector, angle, center, n, result, order_no=0):
a = atoms.copy()
a.rotate(vector, a=angle, center=center)
positions = a.get_positions()
equals = get_equals(atoms, positions)
on = order_no
if equals != None:
operation_name = "C%i" % n
while order_no > 0:
operation_name += "'"
order_no -= 1
result.append(
SymmetryOperation(operation_name,
equals,
None,
vector=vector,
magnitude=n,
type='C',
order_no=on))
def _get_name(self):
""" Get the name of the point group
"""
# Using a flow charts from http://www.mineralatlas.com/fga/image007.gif and
# http://capsicum.me.utexas.edu/ChE386K/html/flowchart_point_groups.htm
# If two or more C_n with n > 2...
if len(
[rot for rot in self.rotations if rot.n > 2 and rot.exponent == 1
]) >= 2:
# 12 C5 axes?
if self.num_C_n_axes(5) == 12:
if self.inversion is None:
self.name = 'I'
return
else:
self.name = 'I_h'
return
# 6 C4s?
elif self.num_C_n_axes(4) == 6:
if self.inversion is None:
self.name = 'O'
return
else:
self.name = 'O_h'
return
# 4 C3s?
elif self.num_C_n_axes(3) == 4:
# 8 C3s?
if self.inversion is None:
if len(self.reflections) == 6:
self.name = 'T_d'
return
else:
self.name = 'T'
return
else:
self.name = 'T_h'
return
else:
raise GroupTheoryError(
"Don't know the name of group with classes: " +
str(self.classes) + ". (Perhaps adjust tolerances?)")
elif len(self.rotations) > 0:
highest_Cn = self.rotations[0]
highest_n = highest_Cn.n
highest_axis = highest_Cn.axis
count = 0
for rot in self.rotations:
if rot.n == 2 and SymmetryOperation.is_perpendicular(
highest_axis, rot.axis):
count += 1
if count == highest_n:
if any(ref.is_principal_reflection()
for ref in self.reflections):
self.name = 'D_' + str(highest_n) + 'h'
return
elif len(self.reflections) == highest_n:
self.name = 'D_' + str(highest_n) + 'd'
return
elif len(self.reflections) == 0:
self.name = 'D_' + str(highest_n)
else:
raise GroupTheoryError(
"Don't know the name of group with classes: " +
str(self.classes) + ". (Perhaps adjust tolerances?)")
else:
if any(ref.is_principal_reflection()
for ref in self.reflections):
self.name = 'C_' + str(highest_n) + 'h'
return
elif len(self.reflections) == highest_n:
self.name = 'C_' + str(highest_n) + 'v'
return
elif any(irot.n == 2 * highest_n
for irot in self.improper_rotations):
self.name = 'S_' + str(2 * highest_n)
return
else:
self.name = 'C_' + str(highest_n)
return
else:
if len(self.reflections) == 1:
self.name = 'C_s'
return
elif not self.inversion is None:
self.name = 'C_i'
return
elif len(self) == 1:
self.name = 'C_1'
else:
raise GroupTheoryError(
"Don't know the name of group with classes: " +
str(self.classes) + ". (Perhaps adjust tolerances?)")
def _name_operations(self):
""" Determines the most-likely-to-be human-readable names for the operations.
"""
# Figure out the principal reflections (sigma_h's)
principal_rotations = []
for k, g in itertools.groupby(sorted(self.rotations),
attrgetter('n', 'exponent')):
principal_rotations = list(g)
break
if len(principal_rotations) > 0:
if principal_rotations[0].n > 2:
# Mark them all as sigma_h's
for rot in principal_rotations:
for op in self.reflections:
if SymmetryOperation.is_same_axis(op.axis, rot.axis):
op.principal_reflection = True
else:
# Otherwise, just choose the Z axis
for op in self.reflections:
if SymmetryOperation.is_same_axis(
op.axis, principal_rotations[0].axis):
op.principal_reflection = True
break
self.operations.sort()
self._rotations = None
self._improper_rotations = None
self._reflections = None
self.identity_element.name = "E"
if not self.inversion is None:
self.inversion.name = 'i'
for key, rotiter in itertools.groupby(self.rotations, attrgetter('n')):
rotgrp = list(rotiter)
prime_count = 0
labels = []
order = rotgrp[0].n
if len(rotgrp) == rotgrp[0].n - 1:
# only one axis, label it simply
rotgrp[0].name = "C_" + str(order)
for i in xrange(1, len(rotgrp)):
rotgrp[i].name = "C_" + str(order) + "^" + str(
rotgrp[i].exponent)
else:
naxes = len([x for x in rotgrp if x.exponent == 1])
has_paren_label = False
for i, rot in enumerate(rotgrp):
if i < naxes:
if SymmetryOperation.is_same_axis(
rot.axis, Vector(0, 0, 1)):
labels.append("(z)")
has_paren_label = True
rot.name = "C_" + str(order) + "(z)"
elif SymmetryOperation.is_same_axis(
rot.axis, Vector(0, 1, 1)):
labels.append("(y)")
has_paren_label = True
rot.name = "C_" + str(order) + "(y)"
elif SymmetryOperation.is_same_axis(
rot.axis, Vector(1, 0, 0)):
labels.append("(x)")
has_paren_label = True
rot.name = "C_" + str(order) + "(x)"
else:
label = "'" * (prime_count +
(1 if has_paren_label else 0))
labels.append(label)
prime_count += 1
rot.name = "C_" + str(order) + label
else:
rot.name = "C_" + str(order) + labels[
i % naxes] + "^" + str(rot.exponent)
for key, rotiter in itertools.groupby(self.improper_rotations,
attrgetter('n')):
rotgrp = list(rotiter)
prime_count = 0
labels = []
order = rotgrp[0].n
if len(rotgrp) == rotgrp[0].n - 1:
# only one axis, label it simply
rotgrp[0].name = "S_" + str(order)
for i in xrange(1, len(rotgrp)):
rotgrp[i].name = "S_" + str(order) + "^" + str(
rotgrp[i].exponent)
else:
has_paren_label = False
naxes = len([x for x in rotgrp if x.exponent == 1])
for i, rot in enumerate(rotgrp):
if i < naxes:
if SymmetryOperation.is_same_axis(
rot.axis, Vector(0, 0, 1)):
labels.append("(z)")
has_paren_label = True
rot.name = "S_" + str(order) + "(z)"
elif SymmetryOperation.is_same_axis(
rot.axis, Vector(0, 1, 0)):
labels.append("(y)")
has_paren_label = True
rot.name = "S_" + str(order) + "(y)"
elif SymmetryOperation.is_same_axis(
rot.axis, Vector(1, 0, 0)):
labels.append("(x)")
has_paren_label = True
rot.name = "S_" + str(order) + "(x)"
else:
label = "'" * (prime_count +
(1 if has_paren_label else 0))
labels.append(label)
prime_count += 1
rot.name = "S_" + str(order) + label
else:
rot.name = "S_" + str(order) + labels[
i % naxes] + "^" + str(rot.exponent)
prime_count = {'v': 0, 'd': 0, 'h': 0}
has_paren_label = False
for ref in self.reflections:
subscript = ''
if ref.is_principal_reflection():
subscript = 'h'
elif ref.is_dihedral():
subscript = 'd'
else:
subscript = 'v'
if SymmetryOperation.is_same_axis(ref.axis, Vector(0, 0, 1)):
ref.name = "sigma_" + subscript + "(xy)"
has_paren_label = True
elif SymmetryOperation.is_same_axis(ref.axis, Vector(0, 1, 0)):
ref.name = "sigma_" + subscript + "(xz)"
has_paren_label = True
elif SymmetryOperation.is_same_axis(ref.axis, Vector(1, 0, 0)):
ref.name = "sigma_" + subscript + "(yz)"
has_paren_label = True
else:
label = "'" * (prime_count[subscript] +
(1 if has_paren_label else 0))
prime_count[subscript] += 1
ref.name = "sigma_" + subscript + label
self.classes.sort(key=attrgetter('first_element'))
def get_periodic_symmetry_operations(atoms, error_tolerance=0.01, debug=False):
from ase.utils import irotate
from ase.visualize import view
from pyspglib import spglib
#symmetry = spglib.get_symmetry(atoms, symprec=1e-5)
symmetry = spglib.get_symmetry(atoms, symprec=1e-2)
dataset = spglib.get_symmetry_dataset(atoms, symprec=1e-2)
result = []
if debug:
cell, scaled_positions, numbers = spglib.find_primitive(atoms,
symprec=1e-5)
a = Atoms(symbols='O4',
cell=cell,
scaled_positions=scaled_positions,
pbc=True)
#symmetry = spglib.get_symmetry(a, symprec=1e-2)
#dataset = spglib.get_symmetry_dataset(a, symprec=1e-2)
print dataset['equivalent_atoms']
print dataset['international']
print dataset['hall']
print dataset['wyckoffs']
print dataset['transformation_matrix']
print "Number of symmetry operations %i" % len(dataset['rotations'])
for i in range(dataset['rotations'].shape[0]):
new_atoms = atoms.copy()
test = atoms.copy()
rot = dataset['rotations'][i]
trans = dataset['translations'][i]
if debug:
x, y, z = irotate(rot)
#print x, y, z
print "------------------- %i -----------------------" % i
print "Rotation"
print rot
print "Translation"
print trans
new_pos = new_atoms.get_scaled_positions()
for l, pos in enumerate(new_atoms.get_scaled_positions()):
#print new_pos[l]
new_pos[l] = (numpy.dot(rot, pos))
new_pos[l] += trans
#print new_pos[l]
new_atoms.set_scaled_positions(new_pos)
equals = get_equals_periodic(atoms,
new_atoms,
error_tolerance=error_tolerance,
debug=debug)
if equals != None:
so = SymmetryOperation(str(i),
equals,
None,
vector=None,
magnitude=1,
rotation_matrix=rot,
translation_vector=trans)
#if debug:
# print so
result.append(so)
else:
print "Equivalent not found"
#view(test)
#view(new_atoms)
#raw_input()
return result
def get_identity_operator(atoms):
equals = numpy.arange(0, len(atoms), 1)
return SymmetryOperation("Identity", equals, None)
def _get_name(self):
""" Get the name of the point group
"""
# Using a flow charts from http://www.mineralatlas.com/fga/image007.gif and
# http://capsicum.me.utexas.edu/ChE386K/html/flowchart_point_groups.htm
# If two or more C_n with n > 2...
if len([rot for rot in self.rotations if rot.n > 2 and rot.exponent == 1 ]) >= 2:
# 12 C5 axes?
if self.num_C_n_axes(5) == 12:
if self.inversion is None:
self.name = 'I'
return
else:
self.name = 'I_h'
return
# 6 C4s?
elif self.num_C_n_axes(4) == 6:
if self.inversion is None:
self.name = 'O'
return
else:
self.name = 'O_h'
return
# 4 C3s?
elif self.num_C_n_axes(3) == 4:
# 8 C3s?
if self.inversion is None:
if len(self.reflections) == 6:
self.name = 'T_d'
return
else:
self.name = 'T'
return
else:
self.name = 'T_h'
return
else:
raise GroupTheoryError("Don't know the name of group with classes: " + str(self.classes)
+ ". (Perhaps adjust tolerances?)")
elif len(self.rotations) > 0:
highest_Cn = self.rotations[0]
highest_n = highest_Cn.n
highest_axis = highest_Cn.axis
count = 0
for rot in self.rotations:
if rot.n == 2 and SymmetryOperation.is_perpendicular(highest_axis, rot.axis):
count += 1
if count == highest_n:
if any(ref.is_principal_reflection() for ref in self.reflections):
self.name = 'D_' + str(highest_n) + 'h'
return
elif len(self.reflections) == highest_n:
self.name = 'D_' + str(highest_n) + 'd'
return
elif len(self.reflections) == 0:
self.name = 'D_' + str(highest_n)
else:
raise GroupTheoryError("Don't know the name of group with classes: " + str(self.classes)
+ ". (Perhaps adjust tolerances?)")
else:
if any(ref.is_principal_reflection() for ref in self.reflections):
self.name = 'C_' + str(highest_n) + 'h'
return
elif len(self.reflections) == highest_n:
self.name = 'C_' + str(highest_n) + 'v'
return
elif any(irot.n == 2*highest_n for irot in self.improper_rotations):
self.name = 'S_' + str(2*highest_n)
return
else:
self.name = 'C_' + str(highest_n)
return
else:
if len(self.reflections) == 1:
self.name = 'C_s'
return
elif not self.inversion is None:
self.name = 'C_i'
return
elif len(self) == 1:
self.name = 'C_1'
else:
raise GroupTheoryError("Don't know the name of group with classes: " + str(self.classes)
+ ". (Perhaps adjust tolerances?)")
def _name_operations(self):
""" Determines the most-likely-to-be human-readable names for the operations.
"""
# Figure out the principal reflections (sigma_h's)
principal_rotations = []
for k, g in itertools.groupby(sorted(self.rotations), attrgetter('n', 'exponent')):
principal_rotations = list(g)
break
if len(principal_rotations) > 0:
if principal_rotations[0].n > 2:
# Mark them all as sigma_h's
for rot in principal_rotations:
for op in self.reflections:
if SymmetryOperation.is_same_axis(op.axis, rot.axis):
op.principal_reflection = True
else:
# Otherwise, just choose the Z axis
for op in self.reflections:
if SymmetryOperation.is_same_axis(op.axis, principal_rotations[0].axis):
op.principal_reflection = True
break
self.operations.sort()
self._rotations = None
self._improper_rotations = None
self._reflections = None
self.identity_element.name = "E"
if not self.inversion is None:
self.inversion.name = 'i'
for key, rotiter in itertools.groupby(self.rotations, attrgetter('n')):
rotgrp = list(rotiter)
prime_count = 0
labels = []
order = rotgrp[0].n
if len(rotgrp) == rotgrp[0].n - 1:
# only one axis, label it simply
rotgrp[0].name = "C_" + str(order)
for i in xrange(1, len(rotgrp)):
rotgrp[i].name = "C_" + str(order) + "^" + str(rotgrp[i].exponent)
else:
naxes = len([x for x in rotgrp if x.exponent == 1])
has_paren_label = False
for i, rot in enumerate(rotgrp):
if i < naxes:
if SymmetryOperation.is_same_axis(rot.axis, Vector(0,0,1)):
labels.append("(z)")
has_paren_label = True
rot.name = "C_" + str(order) + "(z)"
elif SymmetryOperation.is_same_axis(rot.axis, Vector(0,1,1)):
labels.append("(y)")
has_paren_label = True
rot.name = "C_" + str(order) + "(y)"
elif SymmetryOperation.is_same_axis(rot.axis, Vector(1,0,0)):
labels.append("(x)")
has_paren_label = True
rot.name = "C_" + str(order) + "(x)"
else:
label = "'" * (prime_count + (1 if has_paren_label else 0))
labels.append(label)
prime_count += 1
rot.name = "C_" + str(order) + label
else:
rot.name = "C_" + str(order) + labels[i % naxes] + "^" + str(rot.exponent)
for key, rotiter in itertools.groupby(self.improper_rotations, attrgetter('n')):
rotgrp = list(rotiter)
prime_count = 0
labels = []
order = rotgrp[0].n
if len(rotgrp) == rotgrp[0].n - 1:
# only one axis, label it simply
rotgrp[0].name = "S_" + str(order)
for i in xrange(1, len(rotgrp)):
rotgrp[i].name = "S_" + str(order) + "^" + str(rotgrp[i].exponent)
else:
has_paren_label = False
naxes = len([x for x in rotgrp if x.exponent == 1])
for i, rot in enumerate(rotgrp):
if i < naxes:
if SymmetryOperation.is_same_axis(rot.axis, Vector(0,0,1)):
labels.append("(z)")
has_paren_label = True
rot.name = "S_" + str(order) + "(z)"
elif SymmetryOperation.is_same_axis(rot.axis, Vector(0,1,0)):
labels.append("(y)")
has_paren_label = True
rot.name = "S_" + str(order) + "(y)"
elif SymmetryOperation.is_same_axis(rot.axis, Vector(1,0,0)):
labels.append("(x)")
has_paren_label = True
rot.name = "S_" + str(order) + "(x)"
else:
label = "'" * (prime_count + (1 if has_paren_label else 0))
labels.append(label)
prime_count += 1
rot.name = "S_" + str(order) + label
else:
rot.name = "S_" + str(order) + labels[i % naxes] + "^" + str(rot.exponent)
prime_count = {'v':0, 'd':0,'h':0}
has_paren_label = False
for ref in self.reflections:
subscript = ''
if ref.is_principal_reflection():
subscript = 'h'
elif ref.is_dihedral():
subscript = 'd'
else:
subscript = 'v'
if SymmetryOperation.is_same_axis(ref.axis, Vector(0,0,1)):
ref.name = "sigma_"+ subscript + "(xy)"
has_paren_label = True
elif SymmetryOperation.is_same_axis(ref.axis, Vector(0,1,0)):
ref.name = "sigma_" + subscript + "(xz)"
has_paren_label = True
elif SymmetryOperation.is_same_axis(ref.axis, Vector(1,0,0)):
ref.name = "sigma_" + subscript + "(yz)"
has_paren_label = True
else:
label = "'" * (prime_count[subscript] + (1 if has_paren_label else 0))
prime_count[subscript] += 1
ref.name = "sigma_" + subscript + label
self.classes.sort(key=attrgetter('first_element'))