def test_reciprocal(self):
'''check calculation of reciprocal lattice.'''
r1 = self.lattice.reciprocal()
self.assertEqual((1, 1, 1, 90, 90, 90), r1.abcABG())
L2 = Lattice(2, 4, 8, 90, 90, 90)
r2 = L2.reciprocal()
self.assertEqual((0.5, 0.25, 0.125, 90, 90, 90), r2.abcABG())
rr2 = r2.reciprocal()
self.assertTrue(numpy.array_equal(L2.base, rr2.base))
return
def test_is_hexagonal(self):
p1 = Phase(
point_group="321",
structure=Structure(lattice=Lattice(1, 1, 2, 90, 90, 120)),
)
p2 = Phase(
point_group="m-3m",
structure=Structure(lattice=Lattice(1, 1, 1, 90, 90, 90)),
)
assert p1.is_hexagonal
assert not p2.is_hexagonal
def __init__(self,
central_atom="Cu",
outer_atoms="Cu",
shell_distance=2.54,
num_shells=1,
anti=False,
position=[0, 0, 0]):
"""
Parameters
______________
central_atom: str
The element of the center atom
outer_atoms: str or list
The element of list of elements for the outer atoms of the icosahedron
shell_distance: float
The distance from one atom to each successive shell in the cluster.
num_shells: int
The number of shells in the icosahedron
anti: boolean
If the cluster should be an anti mackay cluster instead of a mackay cluster
"""
super().__init__(position=position)
self.initial_atoms = _create_ico(central_atom=central_atom,
outer_atoms=outer_atoms,
shell_distance=shell_distance,
num_shells=num_shells,
anti=anti)
for i in self.initial_atoms:
self.append(i)
self.radius = num_shells * shell_distance
self.lattice = Lattice(a=1, b=1, c=1, alpha=90, beta=90, gamma=90)
def _get_phase(data_group):
"""Return phase information from a phase data group in an EMsoft dot
product file.
Parameters
----------
data_group : h5py.Group
HDF5 group with the property data sets.
Returns
-------
name : str
Phase name.
point_group : str
Phase point group.
structure : diffpy.structure.Structure
Phase structure.
"""
name = re.search(r"([A-z0-9]+)",
data_group["MaterialName"][:][0].decode()).group(1)
point_group = re.search(r"\[([A-z0-9]+)\]",
data_group["Point Group"][:][0].decode()).group(1)
lattice = Lattice(*tuple(
data_group[f"Lattice Constant {i}"][:]
for i in ["a", "b", "c", "alpha", "beta", "gamma"]))
structure = Structure(title=name, lattice=lattice)
return name, point_group, structure
def get_reciprocal_metric_tensor(lattice: Lattice) -> np.ndarray:
"""Reciprocal metric tensor as defined in EMsoft.
Parameters
----------
lattice
Crystal structure lattice.
Returns
-------
np.ndarray
"""
a, b, c = lattice.abcABG()[:3]
ca, cb, cg = lattice.ca, lattice.cb, lattice.cg
sa, sb, sg = lattice.sa, lattice.sb, lattice.sg
terms_12_21 = a * b * (c ** 2) * (ca * cb - cg)
terms_13_31 = a * (b ** 2) * c * (cg * ca - cb)
terms_23_32 = (a ** 2) * b * c * (cb * cg - ca)
return np.array(
[
[(b * c * sa) ** 2, terms_12_21, terms_13_31],
[terms_12_21, (a * c * sb) ** 2, terms_23_32],
[terms_13_31, terms_23_32, (a * b * sg) ** 2],
]
) / np.linalg.det(lattice.metrics)
def _parse_lattice(self, block):
"""Obtain lattice parameters from a CifBlock.
This method updates self.stru.lattice.
block -- instance of CifBlock
No return value.
"""
if '_cell_length_a' not in block: return
# obtain lattice parameters
try:
latpars = (
leading_float(block['_cell_length_a']),
leading_float(block['_cell_length_b']),
leading_float(block['_cell_length_c']),
leading_float(block['_cell_angle_alpha']),
leading_float(block['_cell_angle_beta']),
leading_float(block['_cell_angle_gamma']),
)
except KeyError as err:
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = str(err)
e = StructureFormatError(emsg)
six.reraise(StructureFormatError, e, exc_traceback)
self.stru.lattice = Lattice(*latpars)
return
def test__set_lattice(self):
"""check Structure._set_lattice()
"""
lat = Lattice()
self.stru.lattice = lat
self.assertEqual(2 * [lat], [a.lattice for a in self.stru])
return
def nisph20():
from diffpy.structure import Lattice, loadStructure
from diffpy.structure.tests.testutils import datafile
from diffpy.structure.expansion.makeellipsoid import makeSphere
ni = loadStructure(datafile('Ni.stru'), 'pdffit')
sph = makeSphere(ni, 20 / 2.0)
sph.placeInLattice(Lattice())
return sph
def nickel_phase():
return Phase(
name="nickel",
space_group=225,
structure=Structure(
lattice=Lattice(3.5236, 3.5236, 3.5236, 90, 90, 90),
atoms=[Atom(xyz=[0, 0, 0], atype="Ni", Uisoequiv=0.006332)],
),
)
def parseLines(self, lines):
"""Parse list of lines in DISCUS format.
Return PDFFitStructure instance or raise StructureFormatError.
"""
self.lines = lines
ilines = self._linesIterator()
self.stru = PDFFitStructure()
record_parsers = {
"cell" : self._parse_cell,
"format" : self._parse_format,
"generator" : self._parse_not_implemented,
"molecule" : self._parse_not_implemented,
"ncell" : self._parse_ncell,
"spcgr" : self._parse_spcgr,
"symmetry" : self._parse_not_implemented,
"title" : self._parse_title,
"shape" : self._parse_shape,
}
try:
# parse header
for self.line in ilines:
words = self.line.split()
if not words or words[0][0] == '#': continue
if words[0] == 'atoms': break
rp = record_parsers.get(words[0], self._parse_unknown_record)
rp(words)
# check if cell has been defined
if not self.cell_read:
emsg = "%d: unit cell not defined" % self.nl
raise StructureFormatError(emsg)
# parse atoms
for self.line in ilines:
words = self.line.replace(',', ' ').split()
if not words or words[0][0] == '#': continue
self._parse_atom(words)
# self consistency check
exp_natoms = reduce(lambda x,y : x*y, self.stru.pdffit['ncell'])
# only check if ncell record exists
if self.ncell_read and exp_natoms != len(self.stru):
emsg = 'Expected %d atoms, read %d.' % \
(exp_natoms, len(self.stru))
raise StructureFormatError(emsg)
# take care of superlattice
if self.stru.pdffit['ncell'][:3] != [1,1,1]:
latpars = list(self.stru.lattice.abcABG())
superlatpars = [ latpars[i]*self.stru.pdffit['ncell'][i]
for i in range(3) ] + latpars[3:]
superlattice = Lattice(*superlatpars)
self.stru.placeInLattice(superlattice)
self.stru.pdffit['ncell'] = [1, 1, 1, exp_natoms]
except (ValueError, IndexError):
exc_type, exc_value, exc_traceback = sys.exc_info()
emsg = "%d: file is not in DISCUS format" % self.nl
e = StructureFormatError(emsg)
six.reraise(StructureFormatError, e, exc_traceback)
return self.stru
def test__get_lattice(self):
"""check Structure._get_lattice()
"""
lat = Lattice()
stru = Structure()
self.assertEqual((1, 1, 1, 90, 90, 90), stru.lattice.abcABG())
stru2 = Structure(lattice=lat)
self.assertTrue(lat is stru2.lattice)
return
def __init__(self, dimensions=(20, 20, 20)):
"""Initializes the simulation cube in nm
Parameters
--------------
dimensions: tuple
The dimensions of the cube to simulate.
"""
self.clusters = []
self.lattice = Lattice(a=1, b=1, c=1, alpha=90, beta=90, gamma=90)
self.dimensions = np.array(dimensions)
def test_placeInLattice(self):
"""check Structure.placeInLattice() -- conversion of coordinates
"""
stru = self.stru
new_lattice = Lattice(.5, .5, .5, 90, 90, 60)
stru.placeInLattice(new_lattice)
a0 = stru[0]
self.assertTrue(numpy.allclose(a0.xyz, [0.0, 0.0, 0.0]))
a1 = stru[1]
self.assertTrue(numpy.allclose(a1.xyz, [2.0, 0.0, 2.0]))
def _dummyAtomWithBiso(crystal, biso):
from numpy import degrees
from diffpy.structure import Lattice, Atom
lattice = Lattice(crystal.a, crystal.b, crystal.c,
degrees(crystal.alpha),
degrees(crystal.beta),
degrees(crystal.gamma))
a = Atom('X', anisotropy=False, lattice=lattice)
a.Bisoequiv = biso
return a
def test_writeStr_xyz(self):
"""check string representation of normal xyz file"""
stru = self.stru
stru.title = "test of writeStr"
stru.lattice = Lattice(1.0, 2.0, 3.0, 90.0, 90.0, 90.0)
stru[:] = [Atom('H', [1., 1., 1.]), Atom('Cl', [3., 2., 1.])]
s1 = stru.writeStr(self.format)
s1 = re.sub('[ \t]+', ' ', s1)
s0 = "2\n%s\nH 1 2 3\nCl 3 4 3\n" % stru.title
self.assertEqual(s1, s0)
return
def test___repr__(self):
"""Test representation of DiffpyStructureParSet objects.
"""
lat = Lattice(3, 3, 2, 90, 90, 90)
atom = Atom("C", [0, 0.2, 0.5])
stru = Structure([atom], lattice=lat)
dsps = DiffpyStructureParSet("dsps", stru)
self.assertEqual(repr(stru), repr(dsps))
self.assertEqual(repr(lat), repr(dsps.lattice))
self.assertEqual(repr(atom), repr(dsps.atoms[0]))
return
def ferrite_phase():
return Phase(
name="ferrite",
space_group=229,
structure=Structure(
lattice=Lattice(2.8665, 2.8665, 2.8665, 90, 90, 90),
atoms=[
Atom(xyz=[0, 0, 0], atype="Fe", Uisoequiv=0.006332),
Atom(xyz=[0.5, 0.5, 0.5], atype="Fe", Uisoequiv=0.006332),
],
),
)
def test___init__(self):
'''Check Lattice.__init__ processing of arguments.
'''
self.assertRaises(ValueError, Lattice,
self.lattice, c=4)
self.assertRaises(ValueError, Lattice,
base=self.lattice.base,
baserot=self.lattice.baserot)
self.assertRaises(ValueError, Lattice, 1, 2, 3)
self.assertRaises(ValueError, Lattice, 1, 2, 3, 80, 90)
L0 = self.lattice
L0.setLatBase(L0.cartesian([[1, 1, 0], [0, 1, 1], [1, 0, 1]]))
L1 = Lattice(L0)
self.assertTrue(numpy.array_equal(L0.base, L1.base))
L2 = Lattice(base=L0.base)
self.assertTrue(numpy.array_equal(L0.base, L2.base))
self.assertTrue(numpy.array_equal(L0.isotropicunit, L2.isotropicunit))
L3 = Lattice(*L0.abcABG(), baserot=L0.baserot)
self.assertTrue(numpy.allclose(L0.base, L3.base))
self.assertTrue(numpy.allclose(L0.isotropicunit, L3.isotropicunit))
return
def test_load_emsoft(
self,
temp_emsoft_h5ebsd_file,
map_shape,
step_sizes,
example_rot,
n_top_matches,
refined,
):
xmap = load(temp_emsoft_h5ebsd_file.filename, refined=refined)
assert xmap.shape == map_shape
assert (xmap.dy, xmap.dx) == step_sizes
if refined:
n_top_matches = 1
assert xmap.rotations_per_point == n_top_matches
# Properties
expected_props = [
"AvDotProductMap",
"CI",
"CIMap",
"IQ",
"IQMap",
"ISM",
"ISMap",
"KAM",
"OSM",
"TopDotProductList",
"TopMatchIndices",
]
if refined:
expected_props += ["RefinedDotProducts"]
actual_props = list(xmap.prop.keys())
actual_props.sort()
expected_props.sort()
assert actual_props == expected_props
assert xmap.phases["austenite"].structure == Structure(
title="austenite",
lattice=Lattice(a=3.595,
b=3.595,
c=3.595,
alpha=90,
beta=90,
gamma=90),
)
# Ensure Euler angles in degrees are read correctly from file
if not refined:
assert np.rad2deg(xmap.rotations.to_euler().min()) >= 150
assert np.rad2deg(xmap.rotations.to_euler().max()) <= 160
def setUp(self):
self.stru = Structure(
[Atom('C', [0, 0, 0]), Atom('C', [1, 1, 1])],
lattice=Lattice(1, 1, 1, 90, 90, 120))
if not self._loaded_structures:
self._loaded_structures.update([
('cdse', Structure(filename=cdsefile)),
('tei', Structure(filename=teifile)),
('pbte', Structure(filename=pbtefile)),
])
self.__dict__.update(self._loaded_structures)
self.places = 12
return
def silicon_carbide_phase():
"""Silicon Carbide 4H polytype (hexagonal, space group 186)."""
return Phase(
space_group=186,
structure=Structure(
lattice=Lattice(3.073, 3.073, 10.053, 90, 90, 120),
atoms=[
Atom(atype="Si", xyz=[0, 0, 0]),
Atom(atype="Si", xyz=[0.33, 0.667, 0.25]),
Atom(atype="C", xyz=[0, 0, 0.188]),
Atom(atype="C", xyz=[0.333, 0.667, 0.438]),
],
),
)
def test_write_xyz(self):
"""check writing of normal xyz file"""
stru = self.stru
stru.title = "test of writeStr"
stru.lattice = Lattice(1.0, 2.0, 3.0, 90.0, 90.0, 90.0)
stru[:] = [Atom('H', [1., 1., 1.]), Atom('Cl', [3., 2., 1.])]
filename = self.mktmpfile()
stru.write(filename, self.format)
with open(filename) as fp:
f_s = fp.read()
f_s = re.sub('[ \t]+', ' ', f_s)
s_s = "2\n%s\nH 1 2 3\nCl 3 4 3\n" % stru.title
self.assertEqual(f_s, s_s)
return
def test_latpar_properties(self):
'''check assignment to a, b, c, alpha, beta, gamma.
'''
lat = self.lattice
lat.a = 2
lat.b = 4
lat.c = 6
lat.alpha = 80
lat.beta = 100
lat.gamma = 120
lat1 = Lattice(2, 4, 6, 80, 100, 120)
self.assertAlmostEqual(-0.5, lat.cg, self.places)
self.assertTrue(numpy.array_equal(lat1.base, lat.base))
return
def test_writeStr_rawxyz(self):
"""check writing of normal xyz file"""
stru = self.stru
stru.title = "test of writeStr"
stru.lattice = Lattice(1.0, 2.0, 3.0, 90.0, 90.0, 90.0)
# plain version
stru[:] = [Atom('H', [1., 1., 1.])]
s1 = stru.writeStr(self.format)
s1 = re.sub('[ \t]+', ' ', s1)
s0 = "H 1 2 3\n"
# brutal raw version
stru[0].element = ""
s1 = stru.writeStr(self.format)
s0 = "1 2 3\n"
self.assertEqual(s1, s0)
return
def test_load_emsoft(
self,
temp_emsoft_h5ebsd_file,
map_shape,
step_sizes,
example_rot,
n_top_matches,
refined,
):
cm = load(temp_emsoft_h5ebsd_file.filename, refined=refined)
assert cm.shape == map_shape
assert (cm.dy, cm.dx) == step_sizes
if refined:
n_top_matches = 1
assert cm.rotations_per_point == n_top_matches
# Properties
expected_props = [
"AvDotProductMap",
"CI",
"CIMap",
"IQ",
"IQMap",
"ISM",
"ISMap",
"KAM",
"OSM",
"TopDotProductList",
"TopMatchIndices",
]
if refined:
expected_props += ["RefinedDotProducts"]
actual_props = list(cm.prop.keys())
actual_props.sort()
expected_props.sort()
assert actual_props == expected_props
assert cm.phases["austenite"].structure == Structure(
title="austenite",
lattice=Lattice(a=3.595,
b=3.595,
c=3.595,
alpha=90,
beta=90,
gamma=90),
)
def __copy__(self, target=None):
'''Create a deep copy of this instance.
target -- optional target instance for copying, useful for
copying a derived class. Defaults to new instance
of the same type as self.
Return a duplicate instance of this object.
'''
if target is None:
target = Cluster()
elif target is self:
return target
# copy attributes as appropriate:
target.title = self.title
target.lattice = Lattice(self.lattice)
target.pdffit = copymod.deepcopy(self.pdffit)
# copy all atoms to the target
target[:] = self
return target
def dict2lattice(dictionary):
"""Get a :class:`diffpy.structure.Lattice` object from a dictionary.
Parameters
----------
dictionary : dict
Dictionary with lattice information.
Returns
-------
Lattice
"""
dictionary = copy.deepcopy(dictionary)
lattice_dict = {
k: v
for k, v in zip(["a", "b", "c", "alpha", "beta", "gamma"], dictionary["abcABG"])
}
lattice_dict["baserot"] = dictionary["baserot"]
return Lattice(**lattice_dict)
def get_direct_structure_matrix(lattice: Lattice) -> np.ndarray:
"""Direct structure matrix as defined in EMsoft.
Parameters
----------
lattice
Crystal structure lattice.
Returns
-------
"""
a, b, c = lattice.abcABG()[:3]
ca, cb, cg = lattice.ca, lattice.cb, lattice.cg
sa, sb, sg = lattice.sa, lattice.sb, lattice.sg
return np.array([
[a, b * cg, c * cb],
[0, b * sg, -c * (cb * cg - ca) / sg],
[0, 0, lattice.volume / (a * b * sg)],
])
class TestCrystallographicMatrices:
@pytest.mark.parametrize(
"lattice, desired_matrix",
[
(Lattice(3.52, 3.52, 3.52, 90, 90, 90), np.eye(3) / 3.52),
(
Lattice(3.52, 3.52, 10.5, 90, 90, 120),
np.array([[0.284, 0, 0], [0.164, 0.328, 0], [0, 0, 0.095]]),
),
],
)
def test_reciprocal_structure_matrix(self, lattice, desired_matrix):
assert np.allclose(
get_reciprocal_structure_matrix(lattice), desired_matrix, atol=1e-3
)
@pytest.mark.parametrize(
"lattice, desired_matrix",
[
(Lattice(3.52, 3.52, 3.52, 90, 90, 90), np.eye(3) * 3.52),
(
Lattice(3.52, 3.52, 10.5, 90, 90, 120),
np.array([[3.52, -1.76, 0], [0, 3.048, 0], [0, 0, 10.5]]),
),
],
)
def test_direct_structure_matrix(self, lattice, desired_matrix):
assert np.allclose(
get_direct_structure_matrix(lattice), desired_matrix, atol=1e-3
)
@pytest.mark.parametrize(
"lattice, desired_matrix",
[
(Lattice(3.52, 3.52, 3.52, 90, 90, 90), np.eye(3) * 0.080),
(
Lattice(3.52, 3.52, 10.5, 90, 90, 120),
np.array(
[[0.107, 0.053, -0], [0.053, 0.107, -0], [-0, -0, 0.009]]
),
),
],
)
def test_reciprocal_metric_tensor(self, lattice, desired_matrix):
recip_metrics = get_reciprocal_metric_tensor(lattice)
assert np.allclose(
recip_metrics, lattice.reciprocal().metrics, atol=1e-3
)
assert np.allclose(recip_metrics, desired_matrix, atol=1e-3)
def test___init__(self):
"""check Structure.__init__()
"""
atoms = [Atom('C', [0, 0, 0]), Atom('C', [0.5, 0.5, 0.5])]
self.assertRaises(ValueError, Structure, atoms, filename=teifile)
self.assertRaises(ValueError,
Structure,
lattice=Lattice(),
filename=teifile)
self.assertRaises(ValueError,
Structure,
title='test',
filename=teifile)
stru1 = Structure(title='my title')
self.assertEqual('my title', stru1.title)
stru2a = Structure(atoms)
stru2b = Structure(iter(atoms))
stru2c = Structure(a for a in atoms)
s2a = str(stru2a)
self.assertEqual(s2a, str(stru2b))
self.assertEqual(s2a, str(stru2c))
return
def setUp(self):
self.lattice = Lattice()
self.places = 12
return
class TestLattice(unittest.TestCase):
"""test methods of Lattice class"""
def setUp(self):
self.lattice = Lattice()
self.places = 12
return
def test___init__(self):
'''Check Lattice.__init__ processing of arguments.
'''
self.assertRaises(ValueError, Lattice,
self.lattice, c=4)
self.assertRaises(ValueError, Lattice,
base=self.lattice.base,
baserot=self.lattice.baserot)
self.assertRaises(ValueError, Lattice, 1, 2, 3)
self.assertRaises(ValueError, Lattice, 1, 2, 3, 80, 90)
L0 = self.lattice
L0.setLatBase(L0.cartesian([[1, 1, 0], [0, 1, 1], [1, 0, 1]]))
L1 = Lattice(L0)
self.assertTrue(numpy.array_equal(L0.base, L1.base))
L2 = Lattice(base=L0.base)
self.assertTrue(numpy.array_equal(L0.base, L2.base))
self.assertTrue(numpy.array_equal(L0.isotropicunit, L2.isotropicunit))
L3 = Lattice(*L0.abcABG(), baserot=L0.baserot)
self.assertTrue(numpy.allclose(L0.base, L3.base))
self.assertTrue(numpy.allclose(L0.isotropicunit, L3.isotropicunit))
return
def test_setLatPar(self):
"""check calculation of standard unit cell vectors"""
from numpy import dot
from math import radians, sqrt, cos
norm = lambda x : sqrt(sum([xi**2 for xi in x]))
cosd = lambda x : cos(radians(x))
self.lattice.setLatPar(1.0, 2.0, 3.0, 80, 100, 120)
base = self.lattice.base
self.assertAlmostEqual(1.0, norm(base[0]), self.places)
self.assertAlmostEqual(2.0, norm(base[1]), self.places)
self.assertAlmostEqual(3.0, norm(base[2]), self.places)
self.assertAlmostEqual(cosd(80.0),
dot(base[1],base[2])/(2*3), self.places)
self.assertAlmostEqual(cosd(100.0),
dot(base[0],base[2])/(1*3), self.places)
self.assertAlmostEqual(cosd(120.0),
dot(base[0],base[1])/(1*2), self.places)
return
def test_latpar_properties(self):
'''check assignment to a, b, c, alpha, beta, gamma.
'''
lat = self.lattice
lat.a = 2
lat.b = 4
lat.c = 6
lat.alpha = 80
lat.beta = 100
lat.gamma = 120
lat1 = Lattice(2, 4, 6, 80, 100, 120)
self.assertAlmostEqual(-0.5, lat.cg, self.places)
self.assertTrue(numpy.array_equal(lat1.base, lat.base))
return
def test_readonly_properties(self):
'''Check that read-only properties are indeed such.
'''
lat = self.lattice
lat.b = 2
lat.c = 6
self.assertEqual(1.0, lat.unitvolume)
self.assertRaises(AttributeError, setattr,
lat, 'unitvolume', 3.33)
self.assertEqual(12, lat.volume)
self.assertRaises(AttributeError, setattr,
lat, 'volume', 3.33)
self.assertEqual(0.0, lat.ca)
self.assertRaises(AttributeError, setattr,
lat, 'ca', 3.33)
self.assertEqual(0.0, lat.cb)
self.assertRaises(AttributeError, setattr,
lat, 'cb', 3.33)
self.assertEqual(0.0, lat.cg)
self.assertRaises(AttributeError, setattr,
lat, 'cg', 3.33)
self.assertEqual(1.0, lat.sa)
self.assertRaises(AttributeError, setattr,
lat, 'sa', 3.33)
self.assertEqual(1.0, lat.sb)
self.assertRaises(AttributeError, setattr,
lat, 'sb', 3.33)
self.assertEqual(1.0, lat.sg)
self.assertRaises(AttributeError, setattr,
lat, 'sg', 3.33)
self.assertEqual(1.0, lat.ar)
self.assertRaises(AttributeError, setattr,
lat, 'ar', 3.33)
self.assertEqual(0.5, lat.br)
self.assertRaises(AttributeError, setattr,
lat, 'br', 3.33)
self.assertAlmostEqual(1.0/6, lat.cr, self.places)
self.assertRaises(AttributeError, setattr,
lat, 'cr', 3.33)
self.assertEqual(90.0, lat.alphar)
self.assertRaises(AttributeError, setattr,
lat, 'alphar', 3.33)
self.assertEqual(90.0, lat.betar)
self.assertRaises(AttributeError, setattr,
lat, 'betar', 3.33)
self.assertEqual(90.0, lat.gammar)
self.assertRaises(AttributeError, setattr,
lat, 'gammar', 3.33)
self.assertEqual(0.0, lat.car)
self.assertRaises(AttributeError, setattr,
lat, 'car', 3.33)
self.assertEqual(0.0, lat.cbr)
self.assertRaises(AttributeError, setattr,
lat, 'cbr', 3.33)
self.assertEqual(0.0, lat.cgr)
self.assertRaises(AttributeError, setattr,
lat, 'cgr', 3.33)
self.assertEqual(1.0, lat.sar)
self.assertRaises(AttributeError, setattr,
lat, 'sar', 3.33)
self.assertEqual(1.0, lat.sbr)
self.assertRaises(AttributeError, setattr,
lat, 'sbr', 3.33)
self.assertEqual(1.0, lat.sgr)
self.assertRaises(AttributeError, setattr,
lat, 'sgr', 3.33)
return
def test_setLatBase(self):
"""check calculation of unit cell rotation"""
base = numpy.array([[1.0, 1.0, 0.0],
[0.0, 1.0, 1.0],
[1.0, 0.0, 1.0]])
self.lattice.setLatBase(base)
self.assertAlmostEqual(self.lattice.a, numpy.sqrt(2.0), self.places)
self.assertAlmostEqual(self.lattice.b, numpy.sqrt(2.0), self.places)
self.assertAlmostEqual(self.lattice.c, numpy.sqrt(2.0), self.places)
self.assertAlmostEqual(self.lattice.alpha, 60.0, self.places)
self.assertAlmostEqual(self.lattice.beta, 60.0, self.places)
self.assertAlmostEqual(self.lattice.gamma, 60.0, self.places)
detR0 = numalg.det(self.lattice.baserot)
self.assertAlmostEqual(detR0, 1.0, self.places)
# try if rotation matrix works
self.assertEqual(numpy.all(base == self.lattice.base), True)
self.lattice.setLatPar(alpha=44, beta=66, gamma=88)
self.assertNotEqual(numpy.all(base == self.lattice.base), True)
self.lattice.setLatPar(alpha=60, beta=60, gamma=60)
self.assertTrue(numpy.allclose(base[0], self.lattice.base[0]))
self.assertTrue(numpy.allclose(base[1], self.lattice.base[1]))
self.assertTrue(numpy.allclose(base[2], self.lattice.base[2]))
# try base checking
self.assertRaises(LatticeError, self.lattice.setLatBase,
[[1, 0, 0], [1,0,0], [0,0,1]])
self.assertRaises(LatticeError, self.lattice.setLatBase,
[[1, 0, 0], [0,0,1], [0,1,0]])
return
def test_reciprocal(self):
'''check calculation of reciprocal lattice.'''
r1 = self.lattice.reciprocal()
self.assertEqual((1, 1, 1, 90, 90, 90), r1.abcABG())
L2 = Lattice(2, 4, 8, 90, 90, 90)
r2 = L2.reciprocal()
self.assertEqual((0.5, 0.25, 0.125, 90, 90, 90), r2.abcABG())
rr2 = r2.reciprocal()
self.assertTrue(numpy.array_equal(L2.base, rr2.base))
return
def test_dot(self):
'''check dot product of lattice vectors.'''
L = self.lattice
L.setLatPar(gamma=120)
self.assertAlmostEqual(-0.5, L.dot([1, 0, 0], [0, 1, 0]), self.places)
va5 = numpy.tile([1.0, 0.0, 0.0], (5, 1))
vb5 = numpy.tile([0.0, 1.0, 0.0], (5, 1))
self.assertTrue(numpy.array_equal(5 * [-0.5], L.dot(va5, vb5)))
self.assertTrue(numpy.array_equal(5 * [-0.5], L.dot(va5[0], vb5)))
self.assertTrue(numpy.array_equal(5 * [-0.5], L.dot(va5, vb5[0])))
return
def test_norm(self):
'''check norm of a lattice vector.'''
self.assertEqual(1, self.lattice.norm([1, 0, 0]))
u = numpy.array([[3, 4, 0], [1, 1, 1]])
self.assertTrue(numpy.allclose([5, 3**0.5], self.lattice.norm(u)))
self.lattice.setLatPar(gamma=120)
self.assertAlmostEqual(1, self.lattice.norm([1, 1, 0]), self.places)
return
def test_rnorm(self):
'''check norm of a reciprocal vector.'''
L = self.lattice
L.setLatPar(1, 1.5, 2.3, 80, 95, 115)
r = L.reciprocal()
hkl = [0.5, 0.3, 0.2]
self.assertAlmostEqual(r.norm(hkl), L.rnorm(hkl), self.places)
hkl5 = numpy.tile(hkl, (5, 1))
self.assertTrue(numpy.allclose(5 * [r.norm(hkl)], L.rnorm(hkl5)))
return
def test_dist(self):
'''check dist function for distance between lattice points.'''
L = self.lattice
L.setLatPar(1, 1.5, 2.3, 80, 95, 115)
u = [0.1, 0.3, 0.7]
v = [0.3, 0.7, 0.7]
d0 = numalg.norm(L.cartesian(numpy.array(u) - v))
self.assertAlmostEqual(d0, L.dist(u, v), self.places)
self.assertAlmostEqual(d0, L.dist(v, u), self.places)
u5 = numpy.tile(u, (5, 1))
v5 = numpy.tile(v, (5, 1))
self.assertTrue(numpy.allclose(5 * [d0], L.dist(u, v5)))
self.assertTrue(numpy.allclose(5 * [d0], L.dist(u5, v)))
self.assertTrue(numpy.allclose(5 * [d0], L.dist(v5, u5)))
return
def test_angle(self):
'''check angle calculation between lattice vectors.'''
from math import degrees, acos
L = self.lattice
L.setLatPar(1, 1.5, 2.3, 80, 95, 115)
u = [0.1, 0.3, 0.7]
v = [0.3, 0.7, 0.7]
uc = L.cartesian(u)
vc = L.cartesian(v)
a0 = degrees(acos(numpy.dot(uc, vc) /
(numalg.norm(uc) * numalg.norm(vc))))
self.assertAlmostEqual(a0, L.angle(u, v), self.places)
self.assertAlmostEqual(a0, L.angle(v, u), self.places)
u5 = numpy.tile(u, (5, 1))
v5 = numpy.tile(v, (5, 1))
self.assertTrue(numpy.allclose(5 * [a0], L.angle(u, v5)))
self.assertTrue(numpy.allclose(5 * [a0], L.angle(u5, v)))
self.assertTrue(numpy.allclose(5 * [a0], L.angle(v5, u5)))
return
def test_repr(self):
"""check string representation of this lattice"""
r = repr(self.lattice)
self.assertEqual(r, "Lattice()")
self.lattice.setLatPar(1, 2, 3, 10, 20, 30)
r = repr(self.lattice)
r0 = "Lattice(a=1, b=2, c=3, alpha=10, beta=20, gamma=30)"
self.assertEqual(r, r0)
base = [[1.0, 1.0, 0.0],
[0.0, 2.0, 2.0],
[3.0, 0.0, 3.0]]
self.lattice.setLatBase(base)
r = repr(self.lattice)
self.assertEqual(r, "Lattice(base=%r)" % self.lattice.base)