class QEStructure( Structure ):
"""
Parses and handles Quantum Espresso structure information.
QEStructure is inherited from a diffpy.Structure, which is in turn
inherited from a Python list.
QEStructure is a list of QEAtom object instances.
All list functionality is preserved. setitem and
setslice methods are overloaded so that the lattice attribute
of atoms get set to lattice.
QEStructure, QELattice and QEAtom objects contain a hidden QEInput
pointer to current Quantum Espresso parsing object.
if QEInput.autoUpdate = True (default),any change in a property from
QEStructure, QELattice, or QEAtom will automatically invoke
QEInput.update(). In that case, QEInput.save() or QEInput.toString() will
immediately yield updated QE input file or a string
All properties are mutually synchronized. E.g. change in a lattice parameter
will also affect other lattice parameters as well as atomic positions
according to the lattice type (ibrav)
All relevant methods from diffpy.Structure are redefined.
QEStructure read only properties, automatically synchronized with current
list of Atoms:
nat -- "number of atoms" (integer)
ntyp -- "number of atomic types" (integer)
atomicSpecies -- OrderedDic of AtomicSpecies class instances
(see AtomicSpecies class definition)
Other properties:
atomicPositionsType -- 'crystal' (default), 'alat', 'bohr', and 'angstrom'
Note: This version of QEStructure does not support multiple images from
QE input files
"""
def __init__(self, atoms = [], lattice = None, filename = None, qeInput = None):
"""
atoms -- list of QEAtom atom instances or a QEStructure object
lattice -- QELattice object
filename -- filename QE input file
qeInput -- pointer to a PWInput parsing object. If not None,
its PWInput.structure and PWInput.structure.lattice
will be reset to the current instance of the structure
"""
Structure.__init__(self)
self.formatString = '%# .8f %# .8f %# .8f'
self._atomicPositionsType = 'crystal'
self._qeInput = qeInput
self.lattice = QELattice()
self.lattice._qeInput = self._qeInput
if lattice != None:
self.lattice = QELattice( lattice = lattice )
self._qeInput = self.lattice._qeInput
# CP and PW inputs are compatible
from pwinput import PWInput
from cpinput import CPInput
if isinstance( atoms, PWInput) or isinstance( atoms, CPInput):
qeInput = atoms
elif isinstance( atoms, QEStructure):
stru = atoms
self.__dict__.update( stru.__dict__ )
# deep copy of the lattice will deep copy PWInput as well
self.lattice = QELattice(lattice = stru.lattice)
self._qeInput = self.lattice._qeInput
self[:] = stru
else:
if self.lattice == None:
raise "Lattice must be provided"
self[:] = atoms
if filename != None:
qeInput = PWInput(filename = filename)
qeInput.parse()
self.parseInput(qeInput)
if qeInput != None:
self.lattice._qeInput = qeInput
self._qeInput = qeInput
if self.lattice._qeInput != None:
self.lattice._qeInput.structure = self
self.lattice._qeInput.structure.lattice = self.lattice
return
def addNewAtom(self, *args, **kwargs):
"""Add new Atom instance to the end of this Structure.
All arguments are forwarded to Atom constructor.
No return value.
"""
kwargs['lattice'] = self.lattice
a = QEAtom(*args, **kwargs)
list.append(self, a)
self._uncache('labels')
return
def placeInLattice(self, new_lattice):
"""place structure into new_lattice coordinate system
sets lattice to new_lattice and recalculate fractional coordinates
of all atoms so their absolute positionls remain the same
return self
"""
Tx = numpy.dot(self.lattice.diffpy().base, new_lattice.diffpy().recbase)
Tu = numpy.dot(self.lattice.diffpy().normbase, new_lattice.diffpy().recnormbase)
for a in self:
a.xyz = numpy.dot(a.xyz, Tx)
tmpInput = self.lattice._qeInput
self.lattice = new_lattice
self.lattice._qeInput = tmpInput
self.lattice._qeInput.structure = self
return self
##############################################################################
# overloaded list methods - taken from diffpy.Structure
##############################################################################
def append(self, a, copy=True):
"""Append atom to a structure and update its lattice attribute.
a -- instance of QEAtom
copy -- flag for appending a copy of a.
When False, append a and update a.owner.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.append(self, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def insert(self, idx, a, copy=True):
"""Insert atom a before position idx in this Structure.
idx -- position in atom list
a -- instance of QEAtom
copy -- flag for inserting a copy of a.
When False, append a and update a.lattice.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.insert(self, idx, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def extend(self, atoms, copy=True):
"""Extend Structure by appending copies from a list of atoms.
atoms -- list of QEAtom instances
copy -- flag for extending with copies of QEAtom instances.
When False extend with atoms and update their lattice
attributes.
No return value.
"""
self._uncache('labels')
if copy: adups = [QEAtom(a) for a in atoms]
else: adups = atoms
for a in adups: a.lattice = self.lattice
list.extend(self, adups)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def __setitem__(self, idx, a, copy=True):
"""Set idx-th atom to a.
idx -- index of atom in this Structure
a -- instance of QEAtom
copy -- flag for setting to a copy of a.
When False, set to a and update a.lattice.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.__setitem__(self, idx, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def __setslice__(self, lo, hi, atoms, copy=True):
"""Set Structure slice from lo to hi-1 to the sequence of atoms.
lo -- low index for the slice
hi -- high index of the slice
atoms -- sequence of Atom instances
copy -- flag for using copies of Atom instances. When False, set
to existing instances and update their lattice attributes.
No return value.
"""
self._uncache('labels')
if copy: adups = [QEAtom(a) for a in atoms]
else: adups = atoms
for a in adups: a.lattice = self.lattice
list.__setslice__(self, lo, hi, adups)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def _get_nat(self):
return len(self)
nat = property(_get_nat, doc ="number of atoms")
def _get_ntyp(self):
return len(self.atomicSpecies)
ntyp = property(_get_ntyp, doc ="number of types")
def _get_atomicPositionsType(self):
return self._atomicPositionsType
def _set_atomicPositionsType(self, value):
self._atomicPositionsType = value
self.lattice._qeInput.update()
atomicPositionsType = property(_get_atomicPositionsType, \
_set_atomicPositionsType, \
doc ="type of atomic positions (crystal, alat ...)")
def _get_atomicSpecies(self):
atomicSpecies = OrderedDict()
for a in self:
atomicSpecies[a.element] = AtomicSpecies(element = a.element, \
mass = a.mass, potential = a.potential)
return atomicSpecies
atomicSpecies = property(_get_atomicSpecies, \
doc ="returns an ordered dictionary with atomic species' objects")
def __str__(self):
"""simple string representation"""
s = str(self.lattice) + '\n'
if self.atomicPositionsType == 'alat':
s = s + 'Atomic positions in units of lattice parametr "a":\n'
if self.atomicPositionsType == 'crystal':
s = s + 'Atomic positions in crystal coordinates:\n'
for atom in self:
constraint = atom.optConstraint
if self.atomicPositionsType == 'alat':
coords = self.lattice.diffpy().cartesian(atom.xyz)/self.lattice.a
coords = self.formatString%(coords[0], coords[1], coords[2])
else:
if self.atomicPositionsType == 'crystal':
coords = self.formatString%(atom.xyz[0], atom.xyz[1], atom.xyz[2])
else:
raise NonImplementedError
s = s + '%-3s'%self._element(atom) + ' ' + coords + ' ' \
+ str(constraint)[1:-1] + '\n'
s = s + '\n'
for element, specie in self.atomicSpecies.items():
s = s + specie.toString() + '\n'
return s
def atomLabels(self):
labels = []
for l in self.atomicSpecies:
labels.append(l)
return labels
def parseInput(self, qeInput):
from qecalc.qetask.qeparser.qestructureparser.qestructureparser import QEStructureParser
new_structure = QEStructureParser(qeInput).parseqeInput()
self.__Init(new_structure)
def __Init(self, structure):
QEStructure.__init__(self)
if structure is not None:
self.__dict__.update(structure.__dict__)
self.lattice.__dict__.update(structure.lattice.__dict__)
self[:] = structure
def read(self, filename, format = 'pwinput'):
"""Load structure from a file, any original data become lost.
l
filename -- file to be loaded
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
Return instance of data Parser used to process file. This
can be inspected for information related to particular format.
"""
from qecalc.qetask.qeparser.qestructureparser import parser_index
if self._qeInput == None:
from qecalc.qetask.qeparser.pwinput import PWInput
self._qeInput = PWInput()
#self._qeInput.parse()
if format in parser_index:
module = __import__("qestructureparser.P_" + format, globals(), \
locals(), ['P_' + format], -1)
parser = module.getParser(self._qeInput)
new_structure = parser.parse(filename)
else:
diffpyStruct = Structure()
parser = diffpyStruct.read(filename, format = format)
new_structure = QEStructure(qeInput = self._qeInput)
new_structure._setStructureFromDiffpyStructure(diffpyStruct, \
massList = [], psList = [], ibrav = 0)
new_structure.lattice._qeInput.update( forceUpdate = True )
self.__Init(new_structure)
return parser
def readStr(self, s, format = 'pwinput'):
"""Load structure from a string, any original data become lost.
filename -- file to be loaded
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
Return instance of data Parser used to process file. This
can be inspected for information related to particular format.
"""
from qecalc.qetask.qeparser.qestructureparser import parser_index
from qecalc.qetask.qeparser.pwinput import PWInput
#if self._qeInput == None:
# self._qeInput = PWInput()
#self._qeInput.parse()
if format in parser_index:
module = __import__("qestructureparser.P_" + format, globals(), \
locals(), ['P_' + format], -1)
parser = module.getParser(self._qeInput)
new_structure = parser.parseStr(s)
else:
diffpyStruct = Structure()
parser = diffpyStruct.readStr(s, format = format)
new_structure = QEStructure(qeInput = self._qeInput)
new_structure._setStructureFromDiffpyStructure(diffpyStruct, \
massList = [], psList = [], ibrav = 0)
new_structure.lattice._qeInput.update( forceUpdate = True )
#new_structure._qeInput = new_structure.lattice._qeInput
#print 'toString: ', new_structure._qeInput.toString()
#self = QEStructure(new_structure)
self.__Init(new_structure)
return parser
def write(self, filename = None, format = "pwinput"):
"""Save structure to file in the specified format
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
No return value.
"""
if format == "pwinput":
self._qeInput.update( qeInput = qeInput, forceUpdate = True )
if filename == None:
filename = self._qeInput.filename
input = QEInput(config = self._qeInput.toString(), type='pw')
input.save( filename = filename)
else:
self.diffpy().write( filename = filename, format = format )
return
def writeStr(self, format = 'pwinput'):
"""return string representation of the structure in specified format
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
"""
if format == 'pwinput':
return self.toString()
else:
return self.diffpy().writeStr(format = format)
def toString(self, string = None):
"""Writes/updates structure into PW config string.
If the string is None, one, based on current structure
will be generated
"""
if string != None:
stru = QEStructure()
stru.readStr(string, format = 'pwinput')
qeInput = stru._qeInput
else:
qeInput = self._qeInput
self._qeInput.update( qeInput = qeInput, forceUpdate = True )
return qeInput.toString()
def save(self, filename = None):
"""Writes/updates structure into PW config file,
if the file does not exist, new one will be created"""
from os.path import exists
from qecalc.qetask.qeparser.pwinput import PWInput
if filename != None:
if not exists(filename):
f = open(filename, 'w')
qeInput = PWInput()
qeInput.readFile(filename)
else:
qeInput = self._qeInput
self._qeInput.update( qeInput = qeInput, forceUpdate = True )
qeInput.save()
def reduce(self, ibrav = None):
"""
Reduces a structure instance with nonprimitive lattice ( i.e. solves
for equivalent atomic positions) according to specified lattice type (ibrav).
Each ibrav number corresponds to a specific primitive lattice
(see QE documentation).
"""
ib = self.lattice.ibrav
if ibrav != None:
ib = ibrav
a = self.lattice.diffpy().a
b = self.lattice.diffpy().b
c = self.lattice.diffpy().c
cAB = cosd(self.lattice.diffpy().gamma)
cBC = cosd(self.lattice.diffpy().alpha)
cAC = cosd(self.lattice.diffpy().beta)
if ib > 0:
qeLattice = QELattice(ibrav = ib, a = a, b = b, c = c, cBC = cBC, \
cAC = cAC, cAB = cAB)
else:
qeLattice = QELattice(ibrav = ib, base = self.lattice.base)
qeLattice._qeInput = self._qeInput
reducedStructure = QEStructure(self)
reducedStructure.placeInLattice( qeLattice )
# collect atoms that are at equivalent position to some previous atom
duplicates = set([a1
for i0, a0 in enumerate(reducedStructure) for a1 in reducedStructure[i0+1:]
if a0.element == a1.element and equalPositions(a0.xyz, a1.xyz, eps=1e-4)])
# Filter out duplicate atoms. Use slice assignment so that
# reducedStructure is not replaced with a list.
self.lattice = qeLattice
self[:] = [a for a in reducedStructure if not a in duplicates]
return
def load(self, source, **args):
task = {
'diffpy': self._setStructureFromDiffpyStructure,
'matter': self._setStructureFromMatter,
}
if source == 'matter':
if 'ibrav' in args and args['ibrav'] != 0:
task['matter'] = self._setReducedStructureFromMatter
if source == 'diffpy':
if 'ibrav' in args and args['ibrav'] != 0:
task['diffpy'] = self._setReducedStructureFromDiffpyStructure
task[source](**args)
self.lattice._qeInput.update()
def _matter_diffpy(self, structure):
"""
converts matter Structure object to diffpy.Structure
returns diffpy.Structure object
"""
l = structure.lattice
lat = Lattice( a=l.a, b=l.b, c=l.c, alpha=l.alpha, \
beta=l.beta, gamma=l.gamma)
stru = Structure( lattice = lat)
for a in structure:
stru.addNewAtom(atype = a.symbol, xyz = a.xyz, name = a.symbol, \
anisotropy=a.anisotropy, U=a.U, Uisoequiv=a.Uisoequiv, \
lattice=lat)
return stru
def _setStructureFromMatter(self, structure, massList = [], psList = [], ibrav = 0):
stru = self._matter_diffpy( structure )
self._setStructureFromDiffpyStructure(structure=stru,\
massList=massList, psList=psList,ibrav=ibrav)
def _setReducedStructureFromMatter(self, structure, ibrav, massList = [], psList = []):
stru = self._matter_diffpy( structure )
self._setReducedStructureFromDiffpyStructure(structure = stru, \
ibrav=ibrav, massList=massList,psList=psList)
def _setStructureFromDiffpyStructure(self, structure, massList = [], psList = [], ibrav = 0):
"""
structure - diffpy.Structure object
ibrav - Lattice index
psList - list of strings with potential names
diffpyStructure object will be modified with reduced atomic positions
"""
diffpyLattice = structure.lattice
qeLattice = QELattice(ibrav = 0, base = diffpyLattice.base)
qeLattice.a = 1.889725989*qeLattice.a
qeLattice._qeInput = self._qeInput
self.lattice = qeLattice
self.lattice.type = 'generic cubic'
atomNames = []
for a in structure:
if self._element(a) not in atomNames:
atomNames.append(self._element(a))
atomicSpecies = {}
for i, elem in enumerate(atomNames):
if len(massList) - 1 < i:
mass = 0
else:
mass = massList[i]
if len(psList) - 1 < i:
ps = ''
else:
ps = psList[i]
atomicSpecies[elem] = (mass, ps)
self[:] = []
for atom in structure:
elem = self._element(atom)
self.addNewAtom(atype = elem, xyz = atom.xyz, \
mass = atomicSpecies[elem][0], \
potential = atomicSpecies[elem][1],\
lattice = self.lattice, optConstraint = [])
def _setReducedStructureFromDiffpyStructure(self, structure, ibrav, massList = [], psList = []):
"""
structure - diffpy.Structure object
ibrav - Lattice index
psList - list of strings with potential names
diffpyStructure object will be modified with reduced atomic positions
"""
import copy
diffpyLattice = copy.deepcopy(structure.lattice)
a = diffpyLattice.a
b = diffpyLattice.b
c = diffpyLattice.c
cAB = cosd(diffpyLattice.gamma)
cBC = cosd(diffpyLattice.alpha)
cAC = cosd(diffpyLattice.beta)
qeLattice = QELattice(ibrav = ibrav, a = a, b = b, c = c, cBC = cBC, \
cAC = cAC, cAB = cAB)
qeLattice._qeInput = self._qeInput
self.lattice = qeLattice
# make a deep copy:
reducedStructure = Structure(atoms = structure)
reducedStructure.placeInLattice(Lattice(base=qeLattice.diffpy().base))
# collect atoms that are at equivalent position to some previous atom
duplicates = set([a1
for i0, a0 in enumerate(reducedStructure) for a1 in reducedStructure[i0+1:]
if self._element(a0) == self._element(a1) and equalPositions(a0.xyz, a1.xyz, eps=1e-4)])
# Filter out duplicate atoms. Use slice assignment so that
# reducedStructure is not replaced with a list.
reducedStructure[:] = [a for a in reducedStructure if not a in duplicates]
atomNames = []
for a in reducedStructure:
if self._element(a) not in atomNames:
atomNames.append(self._element(a))
atomicSpecies = {}
for i, elem in enumerate(atomNames):
if len(massList) - 1 < i:
mass = 0
else:
mass = massList[i]
if len(psList) - 1 < i:
ps = ''
else:
ps = psList[i]
atomicSpecies[elem] = (mass, ps)
self[:] = []
# convert to bohr units
self.lattice.setLattice(ibrav, self.lattice.a*1.889725989, \
self.lattice.b*1.889725989,
self.lattice.c*1.889725989)
for atom in reducedStructure:
elem = self._element(atom)
self.addNewAtom(atype = elem, xyz = atom.xyz, \
mass = atomicSpecies[elem][0], \
potential = atomicSpecies[elem][1],\
lattice = self.lattice, optConstraint = [])
def updatePWInput(self, qeInput = None):
"""
Deprecated
"""
self._qeInput.update()
def diffpy(self):
stru = Structure(lattice = self.lattice.diffpy())
for atom in self:
stru.addNewAtom(atype = atom.element, xyz = atom.xyz, \
lattice = self.lattice.diffpy() )
return stru
def _element(self, atom):
"""
Is needed for support both diffpy and matter classes
"""
if 'element' in dir(atom):
return atom.element
else:
if 'symbol' in dir(atom):
return atom.symbol
else:
raise
class QEStructure(Structure):
"""
Parses and handles Quantum Espresso structure information.
QEStructure is inherited from a diffpy.Structure, which is in turn
inherited from a Python list.
QEStructure is a list of QEAtom object instances.
All list functionality is preserved. setitem and
setslice methods are overloaded so that the lattice attribute
of atoms get set to lattice.
QEStructure, QELattice and QEAtom objects contain a hidden QEInput
pointer to current Quantum Espresso parsing object.
if QEInput.autoUpdate = True (default),any change in a property from
QEStructure, QELattice, or QEAtom will automatically invoke
QEInput.update(). In that case, QEInput.save() or QEInput.toString() will
immediately yield updated QE input file or a string
All properties are mutually synchronized. E.g. change in a lattice parameter
will also affect other lattice parameters as well as atomic positions
according to the lattice type (ibrav)
All relevant methods from diffpy.Structure are redefined.
QEStructure read only properties, automatically synchronized with current
list of Atoms:
nat -- "number of atoms" (integer)
ntyp -- "number of atomic types" (integer)
atomicSpecies -- OrderedDic of AtomicSpecies class instances
(see AtomicSpecies class definition)
Other properties:
atomicPositionsType -- 'crystal' (default), 'alat', 'bohr', and 'angstrom'
Note: This version of QEStructure does not support multiple images from
QE input files
"""
def __init__(self, atoms=[], lattice=None, filename=None, qeInput=None):
"""
atoms -- list of QEAtom atom instances or a QEStructure object
lattice -- QELattice object
filename -- filename QE input file
qeInput -- pointer to a PWInput parsing object. If not None,
its PWInput.structure and PWInput.structure.lattice
will be reset to the current instance of the structure
"""
Structure.__init__(self)
self.formatString = '%# .8f %# .8f %# .8f'
self._atomicPositionsType = 'crystal'
self._qeInput = qeInput
self.lattice = QELattice()
self.lattice._qeInput = self._qeInput
if lattice != None:
if self.lattice._qeInput != None:
self._qeInput = self.lattice._qeInput
else:
self.lattice._qeInput = self._qeInput
self.lattice = QELattice(lattice=lattice)
# CP and PW inputs are compatible
from pwinput import PWInput
from cpinput import CPInput
if isinstance(atoms, PWInput) or isinstance(atoms, CPInput):
qeInput = atoms
elif isinstance(atoms, QEStructure):
stru = atoms
self.__dict__.update(stru.__dict__)
# deep copy of the lattice will deep copy PWInput as well
self.lattice = QELattice(lattice=stru.lattice)
self._qeInput = self.lattice._qeInput
self[:] = stru
else:
if self.lattice == None:
raise "Lattice must be provided"
self[:] = atoms
if filename != None:
qeInput = PWInput(filename=filename)
qeInput.parse()
self.parseInput(qeInput)
if qeInput != None:
self.lattice._qeInput = qeInput
self._qeInput = qeInput
if self.lattice._qeInput != None:
self.lattice._qeInput.structure = self
self.lattice._qeInput.structure.lattice = self.lattice
return
def addNewAtom(self, *args, **kwargs):
"""Add new Atom instance to the end of this Structure.
All arguments are forwarded to Atom constructor.
No return value.
"""
kwargs['lattice'] = self.lattice
a = QEAtom(*args, **kwargs)
list.append(self, a)
self._uncache('labels')
return
def placeInLattice(self, new_lattice):
"""place structure into new_lattice coordinate system
sets lattice to new_lattice and recalculate fractional coordinates
of all atoms so their absolute positionls remain the same
return self
"""
Tx = numpy.dot(self.lattice.diffpy().base,
new_lattice.diffpy().recbase)
Tu = numpy.dot(self.lattice.diffpy().normbase,
new_lattice.diffpy().recnormbase)
for a in self:
a.xyz = numpy.dot(a.xyz, Tx)
tmpInput = self.lattice._qeInput
self.lattice = new_lattice
self.lattice._qeInput = tmpInput
self.lattice._qeInput.structure = self
return self
##############################################################################
# overloaded list methods - taken from diffpy.Structure
##############################################################################
def append(self, a, copy=True):
"""Append atom to a structure and update its lattice attribute.
a -- instance of QEAtom
copy -- flag for appending a copy of a.
When False, append a and update a.owner.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.append(self, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def insert(self, idx, a, copy=True):
"""Insert atom a before position idx in this Structure.
idx -- position in atom list
a -- instance of QEAtom
copy -- flag for inserting a copy of a.
When False, append a and update a.lattice.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.insert(self, idx, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def extend(self, atoms, copy=True):
"""Extend Structure by appending copies from a list of atoms.
atoms -- list of QEAtom instances
copy -- flag for extending with copies of QEAtom instances.
When False extend with atoms and update their lattice
attributes.
No return value.
"""
self._uncache('labels')
if copy: adups = [QEAtom(a) for a in atoms]
else: adups = atoms
for a in adups:
a.lattice = self.lattice
list.extend(self, adups)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def __setitem__(self, idx, a, copy=True):
"""Set idx-th atom to a.
idx -- index of atom in this Structure
a -- instance of QEAtom
copy -- flag for setting to a copy of a.
When False, set to a and update a.lattice.
No return value.
"""
self._uncache('labels')
adup = copy and QEAtom(a) or a
adup.lattice = self.lattice
list.__setitem__(self, idx, adup)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def __setslice__(self, lo, hi, atoms, copy=True):
"""Set Structure slice from lo to hi-1 to the sequence of atoms.
lo -- low index for the slice
hi -- high index of the slice
atoms -- sequence of Atom instances
copy -- flag for using copies of Atom instances. When False, set
to existing instances and update their lattice attributes.
No return value.
"""
self._uncache('labels')
if copy: adups = [QEAtom(a) for a in atoms]
else: adups = atoms
for a in adups:
a.lattice = self.lattice
list.__setslice__(self, lo, hi, adups)
if hasattr(self, '_qeInput') and self._qeInput != None:
self._qeInput.update()
return
def _get_nat(self):
return len(self)
nat = property(_get_nat, doc="number of atoms")
def _get_ntyp(self):
return len(self.atomicSpecies)
ntyp = property(_get_ntyp, doc="number of types")
def _get_atomicPositionsType(self):
return self._atomicPositionsType
def _set_atomicPositionsType(self, value):
self._atomicPositionsType = value
self.lattice._qeInput.update()
atomicPositionsType = property(_get_atomicPositionsType, \
_set_atomicPositionsType, \
doc ="type of atomic positions (crystal, alat ...)")
def _get_atomicSpecies(self):
atomicSpecies = OrderedDict()
for a in self:
atomicSpecies[a.element] = AtomicSpecies(element = a.element, \
mass = a.mass, potential = a.potential)
return atomicSpecies
atomicSpecies = property(_get_atomicSpecies, \
doc ="returns an ordered dictionary with atomic species' objects")
def __str__(self):
"""simple string representation"""
s = str(self.lattice) + '\n'
if self.atomicPositionsType == 'alat':
s = s + 'Atomic positions in units of lattice parametr "a":\n'
if self.atomicPositionsType == 'crystal':
s = s + 'Atomic positions in crystal coordinates:\n'
for atom in self:
constraint = atom.optConstraint
if self.atomicPositionsType == 'alat':
coords = self.lattice.diffpy().cartesian(
atom.xyz) / self.lattice.a
coords = self.formatString % (coords[0], coords[1], coords[2])
else:
if self.atomicPositionsType == 'crystal':
coords = self.formatString % (atom.xyz[0], atom.xyz[1],
atom.xyz[2])
else:
raise NonImplementedError
s = s + '%-3s'%self._element(atom) + ' ' + coords + ' ' \
+ str(constraint)[1:-1] + '\n'
s = s + '\n'
for element, specie in self.atomicSpecies.items():
s = s + specie.toString() + '\n'
return s
def atomLabels(self):
labels = []
for l in self.atomicSpecies:
labels.append(l)
return labels
def parseInput(self, qeInput):
from qecalc.qetask.qeparser.qestructureparser.qestructureparser import QEStructureParser
new_structure = QEStructureParser(qeInput).parseqeInput()
self.__Init(new_structure)
def __Init(self, structure):
QEStructure.__init__(self)
if structure is not None:
self.__dict__.update(structure.__dict__)
self.lattice.__dict__.update(structure.lattice.__dict__)
self[:] = structure
def read(self, filename, format='pwinput'):
"""Load structure from a file, any original data become lost.
l
filename -- file to be loaded
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
Return instance of data Parser used to process file. This
can be inspected for information related to particular format.
"""
from qecalc.qetask.qeparser.qestructureparser import parser_index
if self._qeInput == None:
from qecalc.qetask.qeparser.pwinput import PWInput
self._qeInput = PWInput()
self._qeInput.structure = self
#self._qeInput.parse()
if format in parser_index:
module = __import__("qestructureparser.P_" + format, globals(), \
locals(), ['P_' + format], -1)
parser = module.getParser(self._qeInput)
new_structure = parser.parse(filename)
else:
diffpyStruct = Structure()
parser = diffpyStruct.read(filename, format=format)
new_structure = QEStructure(qeInput=self._qeInput)
new_structure._setStructureFromDiffpyStructure(diffpyStruct, \
massList = [], psList = [], ibrav = 0)
new_structure.lattice._qeInput.update(forceUpdate=True)
self.__Init(new_structure)
return parser
def readStr(self, s, format='pwinput'):
"""Load structure from a string, any original data become lost.
filename -- file to be loaded
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
Return instance of data Parser used to process file. This
can be inspected for information related to particular format.
"""
from qecalc.qetask.qeparser.qestructureparser import parser_index
#from qecalc.qetask.qeparser.pwinput import PWInput
if self._qeInput == None:
from qecalc.qetask.qeparser.pwinput import PWInput
self._qeInput = PWInput()
self._qeInput.structure = self
#if self._qeInput == None:
# self._qeInput = PWInput()
#self._qeInput.parse()
if format in parser_index:
module = __import__("qestructureparser.P_" + format, globals(), \
locals(), ['P_' + format], -1)
parser = module.getParser(self._qeInput)
new_structure = parser.parseStr(s)
else:
diffpyStruct = Structure()
parser = diffpyStruct.readStr(s, format=format)
new_structure = QEStructure(qeInput=self._qeInput)
new_structure._setStructureFromDiffpyStructure(diffpyStruct, \
massList = [], psList = [], ibrav = 0)
new_structure.lattice._qeInput.update(forceUpdate=True)
#new_structure._qeInput = new_structure.lattice._qeInput
#print 'toString: ', new_structure._qeInput.toString()
#self = QEStructure(new_structure)
self.__Init(new_structure)
return parser
def write(self, filename=None, format="pwinput"):
"""Save structure to file in the specified format
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
No return value.
"""
if format == "pwinput":
self._qeInput.update(forceUpdate=True)
if filename == None:
filename = self._qeInput.filename
input = QEInput(config=self._qeInput.toString(), type='pw')
input.save(filename=filename)
else:
self.diffpy().write(filename=filename, format=format)
return
def writeStr(self, format='pwinput'):
"""return string representation of the structure in specified format
format -- structure formats
'pwinput' ( pw.x input, default), 'pwoutput' (pw.x output),
'bratoms', 'cif', 'discus', 'pdb', 'pdffit', 'rawxyz',
'xcfg', 'xyz'
"""
if format == 'pwinput':
self._qeInput.update(forceUpdate=True)
return self.toString()
else:
return self.diffpy().writeStr(format=format)
def toString(self, string=None):
"""Writes/updates structure into PW config string.
If the string is None, one, based on current structure
will be generated
"""
if string != None:
stru = QEStructure()
stru.readStr(string, format='pwinput')
qeInput = stru._qeInput
else:
qeInput = self._qeInput
self._qeInput.update(qeInput=qeInput, forceUpdate=True)
return qeInput.toString()
def save(self, filename=None):
"""Writes/updates structure into PW config file,
if the file does not exist, new one will be created"""
from os.path import exists
from qecalc.qetask.qeparser.pwinput import PWInput
if filename != None:
if not exists(filename):
f = open(filename, 'w')
qeInput = PWInput()
qeInput.readFile(filename)
else:
qeInput = self._qeInput
self._qeInput.update(qeInput=qeInput, forceUpdate=True)
qeInput.save()
def reduce(self, ibrav=None):
"""
Reduces a structure instance with nonprimitive lattice ( i.e. solves
for equivalent atomic positions) according to specified lattice type (ibrav).
Each ibrav number corresponds to a specific primitive lattice
(see QE documentation).
"""
ib = self.lattice.ibrav
if ibrav != None:
ib = ibrav
a = self.lattice.diffpy().a
b = self.lattice.diffpy().b
c = self.lattice.diffpy().c
cAB = cosd(self.lattice.diffpy().gamma)
cBC = cosd(self.lattice.diffpy().alpha)
cAC = cosd(self.lattice.diffpy().beta)
if ib > 0:
qeLattice = QELattice(ibrav = ib, a = a, b = b, c = c, cBC = cBC, \
cAC = cAC, cAB = cAB)
else:
qeLattice = QELattice(ibrav=ib, base=self.lattice.base)
qeLattice._qeInput = self._qeInput
reducedStructure = QEStructure(self)
reducedStructure.placeInLattice(qeLattice)
# collect atoms that are at equivalent position to some previous atom
duplicates = set([
a1 for i0, a0 in enumerate(reducedStructure)
for a1 in reducedStructure[i0 + 1:] if a0.element == a1.element
and equalPositions(a0.xyz, a1.xyz, eps=1e-4)
])
# Filter out duplicate atoms. Use slice assignment so that
# reducedStructure is not replaced with a list.
self.lattice = qeLattice
self[:] = [a for a in reducedStructure if not a in duplicates]
self._qeInput.structure = self
return
def load(self, source, **args):
task = {
'diffpy': self._setStructureFromDiffpyStructure,
'matter': self._setStructureFromMatter,
}
if source == 'matter':
if 'ibrav' in args and args['ibrav'] != 0:
task['matter'] = self._setReducedStructureFromMatter
if source == 'diffpy':
if 'ibrav' in args and args['ibrav'] != 0:
task['diffpy'] = self._setReducedStructureFromDiffpyStructure
task[source](**args)
self.lattice._qeInput.update()
def _matter_diffpy(self, structure):
"""
converts matter Structure object to diffpy.Structure
returns diffpy.Structure object
"""
l = structure.lattice
lat = Lattice( a=l.a, b=l.b, c=l.c, alpha=l.alpha, \
beta=l.beta, gamma=l.gamma)
stru = Structure(lattice=lat)
for a in structure:
stru.addNewAtom(atype = a.symbol, xyz = a.xyz, name = a.symbol, \
anisotropy=a.anisotropy, U=a.U, Uisoequiv=a.Uisoequiv, \
lattice=lat)
return stru
def _setStructureFromMatter(self,
structure,
massList=[],
psList=[],
ibrav=0):
stru = self._matter_diffpy(structure)
self._setStructureFromDiffpyStructure(structure=stru,\
massList=massList, psList=psList,ibrav=ibrav)
def _setReducedStructureFromMatter(self,
structure,
ibrav,
massList=[],
psList=[]):
stru = self._matter_diffpy(structure)
self._setReducedStructureFromDiffpyStructure(structure = stru, \
ibrav=ibrav, massList=massList,psList=psList)
def _setStructureFromDiffpyStructure(self,
structure,
massList=[],
psList=[],
ibrav=0):
"""
structure - diffpy.Structure object
ibrav - Lattice index
psList - list of strings with potential names
diffpyStructure object will be modified with reduced atomic positions
"""
diffpyLattice = structure.lattice
qeLattice = QELattice(ibrav=0, base=diffpyLattice.base)
qeLattice.a = 1.889725989 * qeLattice.a
qeLattice._qeInput = self._qeInput
self.lattice = qeLattice
self.lattice.type = 'generic cubic'
atomNames = []
for a in structure:
if self._element(a) not in atomNames:
atomNames.append(self._element(a))
atomicSpecies = {}
for i, elem in enumerate(atomNames):
if len(massList) - 1 < i:
mass = 0
else:
mass = massList[i]
if len(psList) - 1 < i:
ps = ''
else:
ps = psList[i]
atomicSpecies[elem] = (mass, ps)
self[:] = []
for atom in structure:
elem = self._element(atom)
self.addNewAtom(atype = elem, xyz = atom.xyz, \
mass = atomicSpecies[elem][0], \
potential = atomicSpecies[elem][1],\
lattice = self.lattice, optConstraint = [])
def _setReducedStructureFromDiffpyStructure(self,
structure,
ibrav,
massList=[],
psList=[]):
"""
structure - diffpy.Structure object
ibrav - Lattice index
psList - list of strings with potential names
diffpyStructure object will be modified with reduced atomic positions
"""
import copy
diffpyLattice = copy.deepcopy(structure.lattice)
a = diffpyLattice.a
b = diffpyLattice.b
c = diffpyLattice.c
cAB = cosd(diffpyLattice.gamma)
cBC = cosd(diffpyLattice.alpha)
cAC = cosd(diffpyLattice.beta)
qeLattice = QELattice(ibrav = ibrav, a = a, b = b, c = c, cBC = cBC, \
cAC = cAC, cAB = cAB)
qeLattice._qeInput = self._qeInput
self.lattice = qeLattice
# make a deep copy:
reducedStructure = Structure(atoms=structure)
reducedStructure.placeInLattice(Lattice(base=qeLattice.diffpy().base))
# collect atoms that are at equivalent position to some previous atom
duplicates = set([
a1 for i0, a0 in enumerate(reducedStructure)
for a1 in reducedStructure[i0 + 1:]
if self._element(a0) == self._element(a1)
and equalPositions(a0.xyz, a1.xyz, eps=1e-4)
])
# Filter out duplicate atoms. Use slice assignment so that
# reducedStructure is not replaced with a list.
reducedStructure[:] = [
a for a in reducedStructure if not a in duplicates
]
atomNames = []
for a in reducedStructure:
if self._element(a) not in atomNames:
atomNames.append(self._element(a))
atomicSpecies = {}
for i, elem in enumerate(atomNames):
if len(massList) - 1 < i:
mass = 0
else:
mass = massList[i]
if len(psList) - 1 < i:
ps = ''
else:
ps = psList[i]
atomicSpecies[elem] = (mass, ps)
self[:] = []
# convert to bohr units
self.lattice.setLattice(ibrav, self.lattice.a*1.889725989, \
self.lattice.b*1.889725989,
self.lattice.c*1.889725989)
for atom in reducedStructure:
elem = self._element(atom)
self.addNewAtom(atype = elem, xyz = atom.xyz, \
mass = atomicSpecies[elem][0], \
potential = atomicSpecies[elem][1],\
lattice = self.lattice, optConstraint = [])
def updatePWInput(self, qeInput=None):
"""
Deprecated
"""
self._qeInput.update()
def diffpy(self):
stru = Structure(lattice=self.lattice.diffpy())
for atom in self:
stru.addNewAtom(atype = atom.element, xyz = atom.xyz, \
lattice = self.lattice.diffpy() )
return stru
def _element(self, atom):
"""
Is needed for support both diffpy and matter classes
"""
if 'element' in dir(atom):
return atom.element
else:
if 'symbol' in dir(atom):
return atom.symbol
else:
raise
class QELattice(object):
"""Class QELattice for working with crystal lattices in QE notation
Uses matter.Lattice class for storage
Following properties are dynamically linked to other properties
(E.g. lattice vectors) and QEInput(if QEInput.autoUpdate = True(default)):
ibrav -- lattice type, setting it into a different value
will automatically update lattice vectors,
QE parsing object and structure
if ibrav = 0, only 'a' parameter is relevant
a, b, c, cBC, cAC ,cAB -- lattice parameters, setting any of them will
dynamically update the QE parsing object
(e.g. pw.input) and structure(if relevant).
They are also ibrav sensitive. E.g. if
ibrav = 1 (simple cubic). Setting 'a' to a \
different value will also modify b and c.
type -- lattice type to save into PWSCF cfg file
'celldm' (default)
'traditional' - using a,b,c,cosAC, cosAB, cosBC;
'generic cubic', 'generic hexagonal' - assume
that section 'CELL_PARAMETERS' exists
'generic' types also assume/set ibrav = 0
setLattice() -- will set everything at once
"""
def __init__(self, ibrav = 1,a = 1. ,b = 1.,c = 1.,
cBC = 0.,cAC = 0. ,cAB = 0., base = None, lattice = None, qeInput = None ):
self.formatString = '%# .8f %# .8f %# .8f'
self._qeInput = qeInput
#self._qeInput = None
self._type = 'celldm'
# Lattice container class, used for lattice operations
self.__primitiveLattice = Lattice()
# Lattice vectors in bohr or angstrom:
self._base = None
# initialize the lattice if there is enough information
if ibrav > 0 and base != None:
self.setLatticeFromQEVectors(ibrav, base)
else:
self.setLattice(ibrav ,a ,b , c, cBC ,cAC ,cAB, base)
# copy constructor:
if isinstance(ibrav, QELattice) or lattice != None:
if lattice.ibrav > 0:
self.setLattice( ibrav = lattice.ibrav, a = lattice.a, \
b = lattice.b, c = lattice.c,
cBC = lattice.cBC, cAC = lattice.cAC,\
cAB = lattice.cAB)
else:
self.setLattice( ibrav = lattice.ibrav, a = lattice.a, \
base = lattice.base )
# copy input:
from pwinput import PWInput
self._qeInput = PWInput()
self._qeInput.readString( lattice._qeInput.toString() )
def __str__(self):
"""simple string representation"""
st = ''
if self._ibrav == 0:
st = st + '"generic" cell:\n'
else:
qeBaseTuple = self._getQEBaseFromParCos(self._ibrav, self._a, self._b, \
self._c, self._cBC, self._cAC, self._cAB)
qeBase = numpy.array(qeBaseTuple[1], dtype = float)*qeBaseTuple[0]
st = st + '"' + qeBaseTuple[2] + '" cell:\n'
for i in range(3):
v = self.__primitiveLattice.base[i,:]
st = st + self.formatString%(v[0], v[1], v[2])
st = st + '\n'
return st
def cartesian(self, u):
"""return cartesian coordinates of a lattice vector"""
return self.__primitiveLattice.cartesian(u)
def fractional(self, rc):
"""return fractional coordinates of a cartesian vector"""
return self.__primitiveLattice.fractional(rc)
def dot(self, u, v):
"""return dot product of 2 lattice vectors"""
return self.__primitiveLattice.dot(u, v)
def norm(self, u):
"""return norm of a lattice vector"""
return self.__primitiveLattice.norm(u)
def dist(self, u, v):
"""Return distance of 2 points in lattice coordinates.
"""
return self.__primitiveLattice.dist(u, v)
def angle(self, u, v):
"""Return angle(u, v) --> angle of 2 lattice vectors in degrees.
"""
return self.__primitiveLattice.angle(u, v)
def recipCartesian(self, kPoint):
"""Conversts a vector in fractional coordinates in reciprocal space into
a vector in cartesian coordinates"""
recip_base = self.matter().reciprocal().base*self._a
return numpy.dot( kPoint, recip_base)
def reciprocalBase(self):
"""
Get reciprocal lattice vectors in units of 2*pi/a
"""
return self.matter().reciprocal().base*self._a
def latticeParams(self):
"""Returns tuple of six lattice parameters:
a, b, c, cos(BC), cos(AC), cos(AB)
"""
return [self._a, self._b,self._c, self._cBC, self._cAC, self._cAB]
def setLattice(self, ibrav, a = None, b = None, c = None,
cBC = None, cAC = None, cAB = None, base = None, updateInput = True):
""" 'base', numpy array of lattice vectors, and 'a' will only be used
if ibrav == 0. Otherwise, ibrav + lattice parameters will be used"""
from math import acos
# if [ibrav, a,b,c,cBC,cAC,cAB, base] == 8*[None]:
# return None
if ibrav == None:
raise NotImplementedError('ibrav should be specified')
self._ibrav = ibrav
if self._ibrav == 0:
# print 'Found "generic" cell:'
if base == None:
raise NotImplementedError('base must be specified')
if a == None:
raise # a and the base must be provided for ibrav = 0
qeBase = numpy.array(base, dtype = float)#*self._a/a
self._a = a
# print qeBase
#self._a = 1.0
if 'generic' not in self._type:
self._type = 'generic cubic'
self.__primitiveLattice.setLatBase(qeBase)
#self._standardLattice.setLatBase(qeBase)
else:
# Make sure all lattice parameters are mutually consistent
# according to ibrav. base array is not used:
if ibrav < 4 or ibrav == 5:
if a is not None:
self._a = self._b = self._c = a
else:
if b is not None:
self._a = self._b = self._c = b
else:
if c is not None:
self._a = self._b = self._c = c
else:
self._b = self._c = self._a
if ibrav < 4:
self._cBC = self._cAC = self._cAB = 0.0
if ibrav == 4 or ibrav == 6 or ibrav == 7:
if a is not None:
self._a = self._b = a
else:
if b is not None:
self._a = self._b = b
else:
self._b = self._a
if c is not None:
self._c = c
if ibrav == 4:
self._cAB = cosd(120.0)
self._cBC = self._cAC = 0.0
if ibrav == 5:
if cBC is not None:
self._cBC = self._cAC = self._cAB = cBC
else:
if cAC is not None:
self._cBC = self._cAC = self._cAB = cAC
else:
if cAB is not None:
self._cBC = self._cAC = self._cAB = cAB
else:
self._cAC = self._cAB = self._cBC
if ibrav == 6 or ibrav == 7:
self._cBC = self._cAC = self._cAB = 0.0
if ibrav > 7 and ibrav <= 14:
if a is not None:
self._a = a
if b is not None:
self._b = b
if c is not None:
self._c = c
if ibrav > 7 and ibrav < 12:
self._cBC = self._cAC = self._cAB = 0.0
if ibrav == 12 or ibrav == 13:
if cAB is not None:
self._cAB = cAB
else:
if cBC is not None or cAC is not None:
raise Exception("Should specify cos(AB) only for" + \
" ibrav = 12 or ibrav = 13" )
self._cBC = self._cAC = 0.0
if ibrav == 14:
if cBC is not None:
self._cBC = cBC
if cAC is not None:
self._cAC = cAC
if cAB is not None:
self._cAB = cAB
qeBaseTuple = self._getQEBaseFromParCos(self._ibrav, self._a, self._b,
self._c, self._cBC, self._cAC, self._cAB)
qeBase = numpy.array(qeBaseTuple[1], dtype = float)*qeBaseTuple[0]
self.__primitiveLattice.setLatBase(qeBase)
alpha = degrees(acos(self._cBC))
beta = degrees(acos(self._cAC))
gamma = degrees(acos(self._cAB))
#self._standardLattice.setLatPar(self._a,self._b,self._c,alpha,beta,gamma)
#self._a0 = a
self._base = qeBase
if self._qeInput != None and updateInput == True:
#self.updatePWInput()
self._qeInput.update( forceUpdate = True )
def matter(self):
'''Returns matter.Lattice object. Do not use it for reading QE
(standard cell) lattice parameters. Use latticeParams, or a, b, c , ...
instead'''
return self.__primitiveLattice
def updatePWInput(self, qeInput = None):
"""
Deprecated
"""
self._qeInput.update( forceUpdate = True )
def setLatticeFromQEVectors(self, ibrav, vectors):
""" Will extract conventional lattice parameters from primitive vectors.
'vectors' - is a list with primitive vectors (in QE notation),
including lattice parameters. For example from PWSCF output"""
from numpy import dot
# default values:
a = b = c = 1.0
cBC = cAC = cAB = 0.0
v = numpy.array(vectors, dtype = float)
if ibrav == 0:
self.setLattice(ibrav = 0, a = 1.0, base = vectors )
return
#raise NotImplementedError
# sc simple cubic:
if ibrav == 1:
a = v[0,0]
if ibrav == 2:
a = b = c = sqrt( 2.0*dot(v[0,:],v[0,:]) )
if ibrav == 3:
a = b = c = 2.0*sqrt( dot(v[0,:],v[0,:])/3.0)
if ibrav == 4:
a = b = sqrt( dot(v[0,:],v[0,:]))
c = sqrt( dot(v[2,:],v[2,:]))
cAB = cosd(120.0)
if ibrav == 5:
a = b = c = sqrt( dot(v[0,:],v[0,:]))
cBC = cAC = cAB = dot(v[0,:],v[2,:])/a**2
if ibrav == 6:
a = b = sqrt( dot(v[0,:],v[0,:]))
c = sqrt( dot(v[2,:],v[2,:]))
if ibrav == 7:
a = b = v[1,0] - v[2,0]
c = v[1,2] + v[2,2]
if ibrav == 8:
a = v[0,0]
b = v[1,1]
c = v[2,2]
if ibrav == 9:
a = v[0,0] - v[1,0]
b = v[0,1] + v[1,1]
c = v[2,2]
if ibrav == 10:
a = v[2,0] - v[0,0] - v[1,0]
b = v[2,1] - v[0,1] + v[1,1]
c = v[0,2] - v[1,2] + v[2,2]
if ibrav == 11:
a = v[0,0] - v[1,0]
b = v[1,1] - v[2,1]
c = v[0,2] - v[2,2]
if ibrav == 12:
a = v[0,0]
b = sqrt( dot(v[1,:],v[1,:]))
cAB = v[1,0]/b
c = v[2,2]
if ibrav == 13:
a = v[0,0] + v[2,0]
b = sqrt( dot(v[1,:],v[1,:]))
c = v[2,2] - v[0,2]
cAB = v[1,0]/b
if ibrav == 14:
a = v[0,0]
b = sqrt( dot(v[1,:],v[1,:]))
cAB = v[1,0]/b
c = sqrt( dot(v[2,:],v[2,:]))
cAC = v[2,0]/c
cBC = v[2,1]*sqrt(1.0 - cAB**2)/c + cAC*cAB
self.setLattice(ibrav, a, b, c, cBC, cAC, cAB)
####################################################################
# property handlers
####################################################################
# lattice parameters
# def _get_a0(self):
# if self._a0 != None:
# return self._a0
# else:
# return self._a
# a0 = property(_get_a0, doc ="old lattice parameter a0")
def _get_a(self):
return self._a
def _set_a(self, value):
#self._a = value
self.setLattice(ibrav = self._ibrav, a = float(value), base = self._base/self._a*value)
a = property(_get_a, _set_a, doc ="lattice parameter a")
def _get_b(self):
return self._b
def _set_b(self, value):
#self._b = value
self.setLattice(ibrav = self._ibrav, b = float(value))
b = property(_get_b, _set_b, doc ="""lattice parameter b""")
def _get_c(self):
return self._c
def _set_c(self, value):
#self._c = value
self.setLattice(ibrav = self._ibrav, c = float(value))
c = property(_get_c, _set_c, doc ="""lattice parameter c""")
def _get_cBC(self):
return self._cBC
def _set_cBC(self, value):
#self._cBC = value
self.setLattice(ibrav = self._ibrav, cBC = float(value))
cBC = property(_get_cBC, _set_cBC, doc ="""lattice parameter cBC""")
def _get_cAC(self):
return self._cAC
def _set_cAC(self, value):
#self._cAC = value
self.setLattice(ibrav = self._ibrav, cAC = float(value))
cAC = property(_get_cAC, _set_cAC, doc ="""lattice parameter cAC""")
def _get_cAB(self):
return self._cAB
def _set_cAB(self, value):
#self._cAB = value
self.setLattice(ibrav = self._ibrav, cAB = float(value))
cAB = property(_get_cAB, _set_cAB, doc ="""lattice parameter cAB""")
def _get_ibrav(self):
return self._ibrav
def _set_ibrav(self, value):
if value < 0: value = 0
ibravOld = self._ibrav
self._ibrav = value
if value == 0:
base = self._base#/self._a
if ibravOld != 4:
self._type = 'generic cubic'
else:
self._type = 'generic hexagonal'
self.setLattice(ibrav = self._ibrav, a = self._a, base = base)
else:
if 'generic' in self._type:
self._type = 'celldm'
base = self._getQEBaseFromParCos( ibrav = self._ibrav, \
a = self._a, b = self._b, c = self._c, cBC = self._cBC, \
cAC = self._cAC, cAB = self._cAB )
qebase = base[0]*numpy.array(base[1])
self.setLatticeFromQEVectors(self._ibrav, qebase)
# self.setLattice(self._ibrav)
ibrav = property(_get_ibrav, _set_ibrav, doc ="""Lattice symmetry parameter
ibrav. Changing it will update the lattice, but leave atomic fractional
coordinates unchanged""")
def _get_type(self):
return self._type
def _set_type(self, value):
if 'generic' in value:
self._type = value
self._ibrav = 0
base = self._base #/self._a
self.setLattice(ibrav = self._ibrav, a = self._a, base = base)
else:
if self._ibrav == 0:
pass
else:
self._type = value
type = property(_get_type, _set_type, doc ="""QE lattice type: 'celldm',
'traditional' or 'generic cubic', 'generic hexagonal'(implies ibrav = 0""")
def _get_base(self):
return self._base
base = property(_get_base, doc ="""QE base array""")
def _getQEBaseFromParCos( self, ibrav = 1, a = 1., b = 1., c = 1.,
cBC = 0.,cAC = 0. ,cAB = 0.):
c_a = float(c)/a
# description dictionary of QE base vectors:
QEBase = {
# sc simple cubic:
1 : (a, [[1, 0, 0],
[0, 1, 0],
[0, 0, 1]],
'Simple Cubic'),
# fcc face centered cubic:
2 : (a/2., [[-1, 0, 1],
[0, 1, 1],
[-1, 1, 0]],
'Face Centered Cubic'),
# bcc body entered cubic:
3 : (a/2., [[1, 1, 1],
[-1, 1, 1],
[-1, -1, 1]],
'Body Centered Cubic'),
# simple hexagonal and trigonal(p):
4 : (a, [[1, 0, 0],
[-0.5, sqrt(3.0)/2.0, 0.],
[0, 0, c_a]],
'Simple Hexagonal or Trigonal(P)'),
# trigonal(r):
5 : (a, [[sqrt((1.-cAB)/2.),-sqrt((1.-cAB)/6.), sqrt((1.+2.*cAB)/3.)],
[0, 2.*sqrt((1.-cAB)/6.), sqrt((1.+2.*cAB)/3.)],
[-sqrt((1.-cAB)/2.), -sqrt((1.-cAB)/6.), sqrt((1.+2.*cAB)/3.)]],
'Trigonal(R)'),
# simple tetragonal (p):
6 : (a, [[1, 0, 0],
[0, 1, 0.],
[0, 0, c_a]],
'Simple Tetragonal(P)'),
# body centered tetragonal (i):
7 : (a/2., [[1, -1, c_a],
[1, 1, c_a],
[-1, -1, c_a]],
'Body Centered Tetragonal (I)'),
# simple orthorhombic (p):
8 : (1.0, [[a, 0., 0.],
[0., b, 0.],
[0., 0., c]],
'Simple Orthorhombic (P)'),
# bco base centered orthorhombic:
9: (1.0, [[a/2., b/2., 0.],
[-a/2., b/2., 0.],
[0., 0., c]],
'Base Centered Orthorhombic'),
# face centered orthorhombic:
10: (1.0, [[a/2., 0., c/2.],
[a/2., b/2., 0.],
[0., b/2., c/2.]],
'Face Centered Orthorhombic' ),
# body centered orthorhombic:
11: (1.0, [[a/2., b/2., c/2.],
[-a/2., b/2., c/2.],
[-a/2., -b/2., c/2.]],
'Body Centered Orthorhombic'),
# monoclinic (p):
12: (1.0, [[a, 0, 0],
[b*cAB, b*sqrt(1.0 - cAB**2), 0],
[0, 0, c]],
'Monoclinic (P)'),
# base centered monoclinic:
13: (1.0, [[a/2., 0, -c/2.],
[b*cAB, b*sqrt(1.0 - cAB**2), 0],
[a/2., 0, c/2.]],
'Base Centered Monoclinic'),
# triclinic:
14: (1.0, [[a, 0, 0],
[b*cAB, b*sqrt(1.0 - cAB**2), 0],
[c*cAC, c*( cBC-cAC*cAB )/sqrt(1.-cAB**2), c*sqrt( 1. +
2.*cBC*cAC*cAB - cBC**2 - cAC**2 - cAB**2)/sqrt(1.-cAB**2)]],
'Triclinic')
}
return QEBase[ibrav]