def benzene_from_parts(self):
ch = mb.load(get_fn('ch.mol2'))
ch.name = 'CH'
mb.translate(ch, -ch[0].pos)
ch.add(mb.Port(anchor=ch[0], separation=0.07), 'a')
mb.rotate_around_z(ch['a'], 120.0 * (np.pi/180.0))
ch.add(mb.Port(anchor=ch[0], separation=0.07), 'b')
mb.rotate_around_z(ch['b'], -120.0 * (np.pi/180.0))
ch_copy = mb.clone(ch)
benzene = mb.Compound(name='Benzene')
benzene.add(ch)
current = ch
for _ in range(5):
ch_new = mb.clone(ch_copy)
mb.force_overlap(move_this=ch_new,
from_positions=ch_new['a'],
to_positions=current['b'])
current = ch_new
benzene.add(ch_new)
carbons = [p for p in benzene.particles_by_name('C')]
benzene.add_bond((carbons[0],carbons[-1]))
return benzene
def apply(self, compound, orientation='', compound_port=''):
"""Arrange copies of a Compound as specified by the Pattern.
Parameters
----------
compound
orientation
Returns
-------
"""
compounds = list()
if self.orientations.get(orientation):
for port in self.orientations[orientation]:
new_compound = clone(compound)
new_port = new_compound.labels[compound_port]
equivalence_transform(new_compound, new_port['up'], port['up'])
compounds.append(new_compound)
else:
for point in self.points:
new_compound = clone(compound)
translate(new_compound, point)
compounds.append(new_compound)
return compounds
def apply_to_compound(self, guest, guest_port_name='down', host=None,
backfill=None, backfill_port_name='up'):
"""Attach copies of a guest Compound to Ports on a host Compound.
Parameters
----------
guest
guest_port_name
host
backfill
backfill_port_name
Returns
-------
"""
n_ports = len(host.available_ports())
assert n_ports >= self.points.shape[0], "Not enough ports for pattern."
assert_port_exists(guest_port_name, guest)
box = host.boundingbox
pattern = self.points * box.lengths + box.mins
port_positions = np.empty(shape=(n_ports, 3))
port_list = list()
for port_idx, port in enumerate(host.available_ports()):
port_positions[port_idx, :] = port['up']['middle'].pos
port_list.append(port)
used_ports = set() # Keep track of used ports for backfilling.
guests = []
for point in pattern:
closest_point_idx = np.argmin(host.min_periodic_distance(point, port_positions))
closest_port = port_list[closest_point_idx]
used_ports.add(closest_port)
# Attach the guest to the closest port.
new_guest = clone(guest)
equivalence_transform(new_guest, new_guest.labels[guest_port_name], closest_port)
guests.append(new_guest)
# Move the port as far away as possible (simpler than removing it).
# There may well be a more elegant/efficient way of doing this.
port_positions[closest_point_idx, :] = np.array([np.inf, np.inf, np.inf])
backfills = []
if backfill:
assert_port_exists(backfill_port_name, backfill)
# Attach the backfilling Compound to unused ports.
for port in port_list:
if port not in used_ports:
new_backfill = clone(backfill)
# Might make sense to have a backfill_port_name option...
equivalence_transform(
new_backfill, new_backfill.labels[backfill_port_name], port)
backfills.append(new_backfill)
return guests, backfills
def test_rigid_with_subcompounds5(self, rigid_benzene):
rigid_benzene2 = mb.clone(rigid_benzene)
double = mb.Compound(subcompounds=[rigid_benzene, rigid_benzene2])
double2 = mb.clone(double)
compound = mb.Compound(subcompounds=[double, double2])
assert compound.max_rigid_id is 3
assert len(list(compound.rigid_particles())) == 48
for rigid_id in range(4):
assert len(list(compound.rigid_particles(rigid_id=rigid_id))) == 12
def __init__(self, proto, port_labels=("up", "down"), n=2):
if n < 1:
raise Exception('n must be 1 or more')
super(Polymer, self).__init__()
for label in port_labels:
assert_port_exists(label, proto)
last_part = None
for _ in range(n):
this_part = clone(proto)
self.add(this_part, 'monomer[$]')
if last_part is None:
first_part = this_part
else:
# Transform this part, such that it's bottom port is rotated
# and translated to the last part's top port.
equivalence_transform(this_part, this_part.labels[port_labels[1]],
last_part.labels[port_labels[0]])
last_part = this_part
# Hoist the last part's top port to be the top port of the polymer.
self.add(last_part.labels[port_labels[0]], port_labels[0], containment=False)
# Hoist the first part's bottom port to be the bottom port of the polymer.
self.add(first_part.labels[port_labels[1]], port_labels[1], containment=False)
def test_bond_graph(self, ch3):
compound = mb.Compound()
compound.add(ch3)
assert compound.n_bonds == 3
assert all(compound.bond_graph.has_node(particle)
for particle in ch3.particles())
ch3_nobonds = mb.clone(ch3)
for bond in ch3_nobonds.bonds():
ch3_nobonds.remove_bond(bond)
compound.add(ch3_nobonds)
assert compound.n_bonds == 3
assert not any(compound.bond_graph.has_node(particle)
for particle in ch3_nobonds.particles())
carbons = list(compound.particles_by_name('C'))
compound.add_bond((carbons[0], carbons[1]))
assert compound.n_bonds == 4
assert all(compound.bond_graph.has_node(particle)
for particle in carbons)
assert any(compound.bond_graph.has_node(particle)
for particle in ch3_nobonds.particles())
compound.remove_bond((carbons[0], carbons[1]))
assert not any(compound.bond_graph.has_node(particle)
for particle in ch3_nobonds.particles())
def test_different_translate_tos_not_origin(self, methane):
shifted = mb.clone(methane)
np.random.seed(0)
point = np.random.rand(3)
shifted.translate_to(point)
x = mb.coordinate_transform._translate_to(methane.xyz, point)
assert np.array_equal(shifted.xyz, x)
def test_create_semi_rigid_bodies_hierarchy(self, benzene_from_parts):
n_benzenes = 10
filled = mb.fill_box(benzene_from_parts,
n_compounds=n_benzenes,
box=[0, 0, 0, 4, 4, 4])
filled.name = 'Benzene box'
filled2 = mb.clone(filled)
compound = mb.Compound(subcompounds=[filled, filled2])
compound.label_rigid_bodies(discrete_bodies='Benzene box')
assert compound.max_rigid_id == 1
assert filled.max_rigid_id == 0
assert filled2.max_rigid_id == 1
assert len(list(compound.rigid_particles())) == n_benzenes * 2 * 12
compound.unlabel_rigid_bodies()
compound.label_rigid_bodies(discrete_bodies='Benzene', rigid_particles='C')
assert compound.max_rigid_id == (n_benzenes*2) - 1
assert filled.max_rigid_id == n_benzenes - 1
assert filled2.max_rigid_id == (n_benzenes*2) - 1
assert len(list(compound.rigid_particles())) == n_benzenes * 2 * 6
assert len(list(filled.rigid_particles())) == n_benzenes * 6
assert len(list(filled2.rigid_particles())) == n_benzenes * 6
compound.unlabel_rigid_bodies()
compound.label_rigid_bodies(discrete_bodies='CH')
assert compound.max_rigid_id == (n_benzenes*2*6) - 1
assert filled.max_rigid_id == (n_benzenes*6) - 1
assert filled2.max_rigid_id == (n_benzenes*2*6) - 1
assert len(list(compound.rigid_particles())) == n_benzenes * 2 * 12
assert len(list(filled.rigid_particles())) == n_benzenes * 12
assert len(list(filled2.rigid_particles())) == n_benzenes * 12
def test_resnames_mdtraj(self, h2o, ethane):
system = mb.Compound([h2o, mb.clone(h2o), ethane])
traj = system.to_trajectory(residues=['Ethane', 'H2O'])
residues = list(traj.top.residues)
assert traj.n_residues == 3
assert residues[0].name == 'H2O'
assert residues[1].name == 'H2O'
assert residues[2].name == 'Ethane'
traj = system.to_trajectory(residues='Ethane')
residues = list(traj.top.residues)
assert traj.n_residues == 2
assert residues[0].name == 'RES'
assert residues[1].name == 'Ethane'
traj = system.to_trajectory(residues=['Ethane'])
residues = list(traj.top.residues)
assert traj.n_residues == 2
assert residues[0].name == 'RES'
assert residues[1].name == 'Ethane'
traj = system.to_trajectory()
residues = list(traj.top.residues)
assert traj.n_residues == 1
assert residues[0].name == 'RES'
def test_resnames_parmed(self, h2o, ethane):
system = mb.Compound([h2o, mb.clone(h2o), ethane])
struct = system.to_parmed(residues=['Ethane', 'H2O'])
assert len(struct.residues) == 3
assert struct.residues[0].name == 'H2O'
assert struct.residues[1].name == 'H2O'
assert struct.residues[2].name == 'Ethane'
assert sum(len(res.atoms) for res in struct.residues) == len(struct.atoms)
struct = system.to_parmed(residues=['Ethane', 'H2O'])
assert len(struct.residues) == 3
assert struct.residues[0].name == 'H2O'
assert struct.residues[1].name == 'H2O'
assert struct.residues[2].name == 'Ethane'
assert sum(len(res.atoms) for res in struct.residues) == len(struct.atoms)
struct = system.to_parmed(residues='Ethane')
assert len(struct.residues) == 2
assert struct.residues[0].name == 'RES'
assert struct.residues[1].name == 'Ethane'
assert sum(len(res.atoms) for res in struct.residues) == len(struct.atoms)
struct = system.to_parmed()
assert len(struct.residues) == 1
assert struct.residues[0].name == 'RES'
assert sum(len(res.atoms) for res in struct.residues) == len(struct.atoms)
def _connect_and_reconnect(chf, bond_vector):
first = mb.clone(chf)
second = mb.clone(chf)
first.add(mb.Port(anchor=first[0], orientation=bond_vector,
separation=0.075), label='up')
second.add(mb.Port(anchor=second[0], orientation=-bond_vector,
separation=0.075), label='down')
c2h2f2 = mb.Compound(subcompounds=(first, second))
mb.force_overlap(first, first['up'], second['down'])
fccf_dihedral_init = calc_dihedral(first[2].pos, first[0].pos,
second[0].pos, second[2].pos)
c2h2f2.remove_bond((first[0], second[0]))
mb.force_overlap(first, first['port[0]'], second['port[0]'])
fccf_dihedral_final = calc_dihedral(first[2].pos, first[0].pos,
second[0].pos, second[2].pos)
return fccf_dihedral_init, fccf_dihedral_final
def solvate(solute, solvent, n_solvent, box, overlap=0.2, seed=12345):
"""Solvate a compound in a box of solvent using packmol.
Parameters
----------
solute : mb.Compound
solvent : mb.Compound
n_solvent : int
box : mb.Box
overlap : float
Returns
-------
solvated : mb.Compound
"""
if not PACKMOL:
raise IOError("Packmol not found")
box = _validate_box(box)
if not isinstance(solvent, (list, set)):
solvent = [solvent]
if not isinstance(n_solvent, (list, set)):
n_solvent = [n_solvent]
# In angstroms for packmol.
box_mins = box.mins * 10
box_maxs = box.maxs * 10
overlap *= 10
center_solute = (box_maxs + box_mins) / 2
# Build the input file for each compound and call packmol.
solvated_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solute_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solute.save(solute_pdb, overwrite=True)
input_text = (PACKMOL_HEADER.format(overlap, solvated_pdb, seed) +
PACKMOL_SOLUTE.format(solute_pdb, *center_solute))
for solv, m_solvent in zip(solvent, n_solvent):
m_solvent = int(m_solvent)
solvent_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solv.save(solvent_pdb, overwrite=True)
input_text += PACKMOL_BOX.format(solvent_pdb, m_solvent,
box_mins[0], box_mins[1], box_mins[2],
box_maxs[0], box_maxs[1], box_maxs[2])
proc = Popen(PACKMOL, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
out, err = proc.communicate(input=input_text)
if err:
_packmol_error(out, err)
# Create the topology and update the coordinates.
solvated = Compound()
solvated.add(solute)
for solv, m_solvent in zip(solvent, n_solvent):
for _ in range(m_solvent):
solvated.add(clone(solv))
solvated.update_coordinates(solvated_pdb)
return solvated
def test_remove_bond_add_ports(self, hydrogen):
h_clone = mb.clone(hydrogen)
h2 = mb.Compound(subcompounds=(hydrogen, h_clone))
mb.force_overlap(h_clone, h_clone['up'], hydrogen['up'])
h2.remove_bond((h2[0], h2[1]))
assert len(h2.all_ports()) == 2
assert len(hydrogen.all_ports()) == 1
assert len(h_clone.all_ports()) == 1
def fill_box(compound, n_compounds, box, overlap=0.2, seed=12345):
"""Fill a box with a compound using packmol.
Parameters
----------
compound : mb.Compound or list of mb.Compound
n_compounds : int or list of int
box : mb.Box
overlap : float
Returns
-------
filled : mb.Compound
"""
if not PACKMOL:
msg = "Packmol not found."
if sys.platform.startswith("win"):
msg = (msg + " If packmol is already installed, make sure that the "
"packmol.exe is on the path.")
raise IOError(msg)
box = _validate_box(box)
if not isinstance(compound, (list, set)):
compound = [compound]
if not isinstance(n_compounds, (list, set)):
n_compounds = [n_compounds]
# In angstroms for packmol.
box_mins = box.mins * 10
box_maxs = box.maxs * 10
overlap *= 10
# Build the input file for each compound and call packmol.
filled_pdb = tempfile.mkstemp(suffix='.pdb')[1]
input_text = PACKMOL_HEADER.format(overlap, filled_pdb, seed)
for comp, m_compounds in zip(compound, n_compounds):
m_compounds = int(m_compounds)
compound_pdb = tempfile.mkstemp(suffix='.pdb')[1]
comp.save(compound_pdb, overwrite=True)
input_text += PACKMOL_BOX.format(compound_pdb, m_compounds,
box_mins[0], box_mins[1], box_mins[2],
box_maxs[0], box_maxs[1], box_maxs[2])
proc = Popen(PACKMOL, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
out, err = proc.communicate(input=input_text)
if err:
_packmol_error(out, err)
# Create the topology and update the coordinates.
filled = Compound()
for comp, m_compounds in zip(compound, n_compounds):
for _ in range(m_compounds):
filled.add(clone(comp))
filled.update_coordinates(filled_pdb)
return filled
def __init__(self):
super(Hexane, self).__init__()
self.add(propyl, 'propyl1')
self.add(mb.clone(propyl), 'propyl2')
mb.force_overlap(self['propyl1'],
self['propyl1']['down'],
self['propyl2']['down'])
def test_rigid_with_subcompounds2(self, rigid_benzene):
rigid_benzene2 = mb.clone(rigid_benzene)
compound = mb.Compound(subcompounds=[rigid_benzene, rigid_benzene2])
assert compound.max_rigid_id is 1
assert rigid_benzene.max_rigid_id is 0
assert rigid_benzene2.max_rigid_id is 1
assert len(list(compound.rigid_particles())) == 24
assert len(list(compound.rigid_particles(rigid_id=0))) == 12
assert len(list(compound.rigid_particles(rigid_id=1))) == 12
def __init__(self):
super(MonoLJ, self).__init__()
lj_proto = mb.Particle(name='LJ', pos=[0, 0, 0])
pattern = mb.Grid3DPattern(5, 5, 5)
pattern.scale(5)
for pos in pattern:
lj_particle = clone(lj_proto)
lj_particle.translate(pos)
self.add(lj_particle)
def test_build_from_single_particle(self):
compound = mb.Compound()
compound.rigid_id = 0
atom = mb.Compound(name='atom')
atom.rigid_id = 0
atom2 = mb.clone(atom)
compound.add([atom, atom2], reset_rigid_ids=False)
assert compound.contains_rigid == True
assert compound.rigid_id is None
assert compound.max_rigid_id is 0
assert len(list(compound.rigid_particles())) == 2
def solvate(solute, solvent, n_solvent, box, overlap=0.2, seed=12345):
"""Solvate a compound in a box of solvent using packmol.
Parameters
----------
solute : mb.Compound
solvent : mb.Compound
n_solvent : int
box : mb.Box
overlap : float
Returns
-------
solvated : mb.Compound
"""
if not PACKMOL:
raise IOError("Packmol not found")
if isinstance(box, (list, tuple)):
box = Box(lengths=box)
n_solvent = int(n_solvent)
solute_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solute.save(solute_pdb, overwrite=True)
solvent_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solvent.save(solvent_pdb, overwrite=True)
solvated_pdb = tempfile.mkstemp(suffix='.pdb')[1]
# In angstroms for packmol.
box_lengths = box.lengths * 10
overlap *= 10
# center_solute = (-solute.center) * 10
center_solute = box_lengths/2
# Build the input file and call packmol.
input_text = (PACKMOL_HEADER.format(overlap, solvated_pdb, seed) +
PACKMOL_SOLUTE.format(solute_pdb, *center_solute) +
PACKMOL_BOX.format(solvent_pdb, n_solvent, *box_lengths))
proc = Popen(PACKMOL, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
out, err = proc.communicate(input=input_text)
if err:
_packmol_error(out, err)
# Create the topology and update the coordinates.
solvated = Compound()
solvated.add(solute)
for _ in range(n_solvent):
solvated.add(clone(solvent))
solvated.update_coordinates(solvated_pdb)
return solvated
def test_chainnames_mdtraj(self, h2o, ethane):
system = mb.Compound([h2o, mb.clone(h2o), ethane])
traj = system.to_trajectory(chains=['Ethane', 'H2O'])
assert traj.n_chains == 3
traj = system.to_trajectory(chains='Ethane')
assert traj.n_chains == 2
traj = system.to_trajectory(chains=['Ethane'])
assert traj.n_chains == 2
traj = system.to_trajectory()
assert traj.n_chains == 1
def test_create_semi_rigid_bodies_filled_no_increment(self, benzene_from_parts):
n_benzenes = 10
filled = mb.fill_box(benzene_from_parts,
n_compounds=n_benzenes,
box=[0, 0, 0, 4, 4, 4])
filled.label_rigid_bodies(discrete_bodies='Benzene', rigid_particles='C')
filled2 = mb.clone(filled)
filled.add(filled2, reset_rigid_ids=False)
assert filled.max_rigid_id == n_benzenes - 1
assert len(list(filled.rigid_particles())) == n_benzenes * 2 * 6
for rigid_id in range(n_benzenes):
assert len(list(filled.rigid_particles(rigid_id=rigid_id))) == 12
def test_rigid_from_parts2(self, rigid_ch):
rigid_ch_copy = mb.clone(rigid_ch)
benzene = mb.Compound()
benzene.add(rigid_ch_copy, reset_rigid_ids=False)
current = rigid_ch_copy
for _ in range(5):
ch_new = mb.clone(rigid_ch)
mb.force_overlap(move_this=ch_new,
from_positions=ch_new['a'],
to_positions=current['b'])
current = ch_new
benzene.add(ch_new, reset_rigid_ids=False)
carbons = [p for p in benzene.particles_by_name('C')]
benzene.add_bond((carbons[0],carbons[-1]))
assert benzene.contains_rigid is True
assert benzene.rigid_id is None
assert benzene.max_rigid_id is 0
assert benzene.children[0].contains_rigid == True
assert benzene.children[0].rigid_id is None
assert len(list(benzene.rigid_particles(rigid_id=0))) == 12
def fill_box(compound, n_compounds, box, overlap=0.2, seed=12345):
"""Fill a box with a compound using packmol.
Parameters
----------
compound : mb.Compound
n_compounds : int
box : mb.Box
overlap : float
Returns
-------
filled : mb.Compound
"""
if not PACKMOL:
msg = "Packmol not found."
if sys.platform.startswith("win"):
msg = (msg + " If packmol is already installed, make sure that the "
"packmol.exe is on the path.")
raise IOError(msg)
if isinstance(box, (list, tuple)):
box = Box(lengths=box)
n_compounds = int(n_compounds)
compound_pdb = tempfile.mkstemp(suffix='.pdb')[1]
compound.save(compound_pdb, overwrite=True)
filled_pdb = tempfile.mkstemp(suffix='.pdb')[1]
# In angstroms for packmol.
box_lengths = box.lengths * 10
overlap *= 10
# Build the input file and call packmol.
input_text = (PACKMOL_HEADER.format(overlap, filled_pdb, seed) +
PACKMOL_BOX.format(compound_pdb, n_compounds, *box_lengths))
proc = Popen(PACKMOL, stdin=PIPE, stdout=PIPE, stderr=PIPE, universal_newlines=True)
out, err = proc.communicate(input=input_text)
if err:
_packmol_error(out, err)
# Create the topology and update the coordinates.
filled = Compound()
for _ in range(n_compounds):
filled.add(clone(compound))
filled.update_coordinates(filled_pdb)
return filled
def __init__(self, anchor=None):
super(Port, self).__init__(name='Port', port_particle=True)
self.anchor = anchor
up = Compound(name='subport', port_particle=True)
up.add(Particle(name='G', pos=[0, 0, 0], port_particle=True), 'middle')
up.add(Particle(name='G', pos=[0, 0.02, 0], port_particle=True), 'top')
up.add(Particle(name='G', pos=[-0.02, -0.01, 0], port_particle=True), 'left')
up.add(Particle(name='G', pos=[0.0, -0.02, 0.01], port_particle=True), 'right')
down = clone(up)
rotate_around_z(down, np.pi)
self.add(up, 'up')
self.add(down, 'down')
def test_rigid_with_subcompounds4(self, benzene):
benzene.label_rigid_bodies(rigid_particles='C')
benzene2 = mb.clone(benzene)
compound = mb.Compound(subcompounds=[benzene, benzene2])
assert compound.contains_rigid is True
assert compound.rigid_id is None
assert compound.max_rigid_id is 1
assert benzene.contains_rigid is True
assert benzene.rigid_id is None
assert benzene.max_rigid_id is 0
assert benzene2.contains_rigid is True
assert benzene2.rigid_id is None
assert benzene2.max_rigid_id is 1
assert len(list(compound.rigid_particles())) == 12
assert len(list(compound.rigid_particles(rigid_id=0))) == 6
assert len(list(compound.rigid_particles(rigid_id=1))) == 6
def test_increment_rigid_id(self, rigid_benzene):
compound = mb.Compound()
rigid_benzene2 = mb.clone(rigid_benzene)
compound.add(rigid_benzene)
compound.add(rigid_benzene2)
assert rigid_benzene.contains_rigid is True
assert rigid_benzene.rigid_id is None
assert rigid_benzene.max_rigid_id is 0
assert rigid_benzene2.contains_rigid is True
assert rigid_benzene2.rigid_id is None
assert rigid_benzene2.max_rigid_id is 1
assert compound.contains_rigid is True
assert compound.rigid_id is None
assert compound.max_rigid_id is 1
assert len(list(compound.rigid_particles(rigid_id=0))) == 12
assert len(list(compound.rigid_particles(rigid_id=1))) == 12
def __init__(self):
super(TnpBox, self).__init__()
tnp_proto = Tnp(ball_radius=5, n_chains=5, chain_length=8)
pattern = mb.Grid3DPattern(3, 3, 3)
pattern.scale(100)
rnd = random.Random()
rnd.seed(1928)
for pos in pattern:
tnp = clone(tnp_proto)
mb.rotate_around_x(tnp, rnd.uniform(0, 2 * pi))
mb.rotate_around_y(tnp, rnd.uniform(0, 2 * pi))
mb.rotate_around_z(tnp, rnd.uniform(0, 2 * pi))
mb.translate(tnp, pos)
self.add(tnp)
def test_update_coords_update_ports(self, ch2):
distances = np.round([ch2.min_periodic_distance(port.pos, ch2[0].pos)
for port in ch2.referenced_ports()], 5)
orientations = np.round([port.pos - port.anchor.pos
for port in ch2.referenced_ports()], 5)
ch2_clone = mb.clone(ch2)
ch2_clone[0].pos += [1, 1, 1]
ch2_clone.save('ch2-shift.pdb')
ch2.update_coordinates('ch2-shift.pdb')
updated_distances = np.round([ch2.min_periodic_distance(port.pos, ch2[0].pos)
for port in ch2.referenced_ports()], 5)
updated_orientations = np.round([port.pos - port.anchor.pos
for port in ch2.referenced_ports()], 5)
assert np.array_equal(distances, updated_distances)
assert np.array_equal(orientations, updated_orientations)
def test_intermol_conversion2(self, ethane, h2o):
# 2 distinct Ethane objects.
compound = mb.Compound([ethane, mb.clone(ethane), h2o])
molecule_types = [type(ethane), type(h2o)]
intermol_system = compound.to_intermol(molecule_types=molecule_types)
assert len(intermol_system.molecule_types) == 2
assert 'Ethane' in intermol_system.molecule_types
assert 'H2O' in intermol_system.molecule_types
assert len(intermol_system.molecule_types['Ethane'].bonds) == 7
assert len(intermol_system.molecule_types['H2O'].bonds) == 2
assert len(intermol_system.molecule_types['Ethane'].molecules) == 2
ethanes = list(intermol_system.molecule_types['Ethane'].molecules)
assert len(ethanes[0].atoms) == len(ethanes[1].atoms) == 8
assert len(intermol_system.molecule_types['H2O'].molecules) == 1
h2os = list(intermol_system.molecule_types['H2O'].molecules)
assert len(h2os[0].atoms) == 3
def test_increment_rigid_id_partial(self, benzene):
compound = mb.Compound()
benzene.label_rigid_bodies(rigid_particles='C')
benzene2 = mb.clone(benzene)
compound.add(benzene)
compound.add(benzene2)
assert benzene.contains_rigid is True
assert benzene.rigid_id is None
assert benzene.max_rigid_id is 0
assert benzene2.contains_rigid is True
assert benzene2.rigid_id is None
assert benzene2.max_rigid_id is 1
assert compound.contains_rigid is True
assert compound.rigid_id is None
assert compound.max_rigid_id is 1
assert len(list(compound.rigid_particles())) == 12
assert len(list(compound.rigid_particles(rigid_id=0))) == 6
assert len(list(compound.rigid_particles(rigid_id=1))) == 6
def run_md_main(molecule, functional, project_name, dire, temperature,
box_length, number_of_molecules, simulation_time, CUTOFF,
SCF_tolerence, basis_set, ensemble, timestep, thermostat):
current_molecule = mb.clone(molecule)
current_molecule = current_molecule.to_parmed()
atom_list, mass_list, total_mass = info_molecule(current_molecule)
unique_atom_list = remove_duplicate(atom_list)
num_atoms = len(atom_list)
num_unique_atoms = len(unique_atom_list)
total_atoms = num_atoms * number_of_molecules
string = "tail -{} {}-pos-1.xyz > {}.xyz".format(total_atoms,
project_name + "pre",
project_name)
subprocess.call(string, shell=True)
if basis_set[0] == None:
basis_set = basis_set * num_unique_atoms
if thermostat == None:
thermostat = 'NOSE'
if CUTOFF == None:
CUTOFF = 900
if SCF_tolerence == None:
SCF_tolerence = 1e-6
if ensemble == None:
ensemble = 'NVT'
#we need to decide time_step
if timestep == None:
lightest = min(mass_list)
if lightest < 1.5:
time_step = 0.5
elif (lightest >= 1.5) and (lightest < 40):
time_step = 1
if lightest >= 40:
time_step = 1.5
steps = round(simulation_time * 1000 / time_step)
mySim = sim.SIM()
mySim.GLOBAL.RUN_TYPE = "MD"
mySim.GLOBAL.PROJECT = project_name
mySim.GLOBAL.PRINT_LEVEL = "LOW"
#FORCE EVAL SECTION
mySim.FORCE_EVAL.METHOD = 'QUICKSTEP'
mySim.FORCE_EVAL.STRESS_TENSOR = 'ANALYTICAL'
mySim.FORCE_EVAL.DFT.BASIS_SET_FILE_NAME = dire + 'BASIS_MOLOPT'
mySim.FORCE_EVAL.DFT.POTENTIAL_FILE_NAME = dire + 'GTH_POTENTIALS'
mySim.FORCE_EVAL.DFT.CHARGE = 0
mySim.FORCE_EVAL.DFT.MULTIPLICITY = 1
mySim.FORCE_EVAL.DFT.MGRID.CUTOFF = CUTOFF
mySim.FORCE_EVAL.DFT.MGRID.REL_CUTOFF = 50
mySim.FORCE_EVAL.DFT.MGRID.NGRIDS = 4
mySim.FORCE_EVAL.DFT.QS.METHOD = 'GPW'
mySim.FORCE_EVAL.DFT.QS.EPS_DEFAULT = 1E-8
mySim.FORCE_EVAL.DFT.QS.EXTRAPOLATION = 'ASPC'
mySim.FORCE_EVAL.DFT.POISSON.PERIODIC = "XYZ"
mySim.FORCE_EVAL.DFT.PRINT.E_DENSITY_CUBE.SECTION_PARAMETERS = "OFF"
mySim.FORCE_EVAL.DFT.SCF.SCF_GUESS = 'ATOMIC'
mySim.FORCE_EVAL.DFT.SCF.MAX_SCF = 2
mySim.FORCE_EVAL.DFT.SCF.EPS_SCF = SCF_tolerence
mySim.FORCE_EVAL.DFT.SCF.OT.SECTION_PARAMETERS = ".TRUE."
mySim.FORCE_EVAL.DFT.SCF.OT.PRECONDITIONER = "FULL_SINGLE_INVERSE"
mySim.FORCE_EVAL.DFT.SCF.OT.MINIMIZER = "DIIS"
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.SECTION_PARAMETERS = '.TRUE.'
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.MAX_SCF = 2
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.EPS_SCF = 1e-6
mySim.FORCE_EVAL.DFT.SCF.PRINT.RESTART.SECTION_PARAMETERS = 'OFF'
mySim.FORCE_EVAL.DFT.SCF.PRINT.DM_RESTART_WRITE = '.TRUE.'
mySim.FORCE_EVAL.DFT.XC.XC_FUNCTIONAL.SECTION_PARAMETERS = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.POTENTIAL_TYPE = 'PAIR_POTENTIAL'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.TYPE = 'DFTD3'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.PARAMETER_FILE_NAME = 'dftd3.dat'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.REFERENCE_FUNCTIONAL = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.R_CUTOFF = 11
mySim.FORCE_EVAL.SUBSYS.COORD.DEFAULT_KEYWORD = project_name + ".xyz"
mySim.FORCE_EVAL.SUBSYS.init_atoms(num_atoms)
for i in range(num_unique_atoms):
mySim.FORCE_EVAL.SUBSYS.KIND[
i + 1].SECTION_PARAMETERS = unique_atom_list[i]
if basis_set[i] == None:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set_setter(
unique_atom_list[i])
else:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set[i]
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].POTENTIAL = potential(
unique_atom_list[i], functional)
mySim.FORCE_EVAL.SUBSYS.CELL.ABC = '{L} {L} {L}'.format(L=10 * box_length)
#MOTION SECTION
mySim.MOTION.GEO_OPT.OPTIMIZER = 'BFGS'
mySim.MOTION.GEO_OPT.MAX_ITER = 100
mySim.MOTION.GEO_OPT.MAX_DR = 0.003
mySim.MOTION.MD.ENSEMBLE = ensemble
mySim.MOTION.MD.STEPS = steps
mySim.MOTION.MD.TIMESTEP = time_step
mySim.MOTION.MD.TEMPERATURE = temperature
mySim.MOTION.MD.THERMOSTAT.TYPE = thermostat
mySim.MOTION.MD.THERMOSTAT.REGION = "MASSIVE"
mySim.MOTION.MD.THERMOSTAT.NOSE.LENGTH = 3
mySim.MOTION.MD.THERMOSTAT.NOSE.YOSHIDA = 3
mySim.MOTION.MD.THERMOSTAT.NOSE.TIMECON = 1000.0
mySim.MOTION.MD.THERMOSTAT.NOSE.MTS = 2
#mySim.MOTION.MD.PRINT.ENERGY.EACH.MD = 20
#mySim.MOTION.MD.PRINT.PROGRAM_RUN_INFO.EACH.MD = 20
#mySim.MOTION.MD.AVERAGES.SECTION_PARAMETERS= ".falbmbjse."
mySim.MOTION.PRINT.STRESS.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.TRAJECTORY.EACH.MD = 1
mySim.MOTION.PRINT.VELOCITIES.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.FORCES.SECTION_PARAMETERS = "OFF"
mySim.MOTION.PRINT.RESTART_HISTORY.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART_HISTORY.EACH.MD = 500
mySim.MOTION.PRINT.RESTART.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART.BACKUP_COPIES = 3
mySim.MOTION.PRINT.RESTART.EACH.MD = 1
mySim.write_changeLog(fn="md-main-changeLog.out")
mySim.write_errorLog()
mySim.write_inputFile(fn='md-main.inp')
def md_files(instance):
molecules = instance.molecules
functional = instance.functional
box = instance.box
cutoff = instance.cutoff
scf_tolerance = instance.scf_tolerance
basis_set = instance.basis_set
basis_set_filename = instance.basis_set_filename
potential_filename = instance.potential_filename
fixed_list = instance.fixed_list
periodicity = instance.periodicity
simulation_time = instance.simulation_time
time_step = instance.time_step
ensemble = instance.ensemble
project_name = instance.project_name
temperature = instance.temperature
pressure = instance.pressure
n_molecules = instance.n_molecules
thermostat = instance.thermostat
traj_type = instance.traj_type
traj_freq = instance.traj_freq
seed = instance.seed
input_filename = instance.input_filename
output_filename = instance.output_filename
filled_box = mb.packing.fill_box(compound=molecules,
n_compounds=n_molecules,
box=box)
initial_coord_file = project_name + ".xyz"
filled_box.save(initial_coord_file, overwrite='True')
with open(initial_coord_file, 'r') as fin:
data = fin.read().splitlines(True)
with open(initial_coord_file, 'w') as fout:
fout.writelines(data[2:]) #deleting first two lines
print('MD initial structure saved as {}'.format(initial_coord_file))
atom_list = []
mass_list = []
for i in range(len(molecules)):
current_molecule = mb.clone(molecules[i])
current_molecule_pmd = current_molecule.to_parmed()
x, y = info_molecule(current_molecule_pmd)
atom_list.extend(x)
mass_list.extend(y)
unique_atom_list = remove_duplicate(atom_list)
num_atoms = len(atom_list)
num_unique_atoms = len(unique_atom_list)
unique_atom_list.sort()
mySim = sim.SIM()
#setting defaults
n_steps = int(simulation_time / time_step)
mySim.GLOBAL.RUN_TYPE = "MD"
mySim.GLOBAL.PROJECT_NAME = project_name
mySim.GLOBAL.PRINT_LEVEL = "LOW"
mySim.GLOBAL.SEED = seed
#FORCE EVAL SECTION
mySim.FORCE_EVAL.METHOD = 'QUICKSTEP'
mySim.FORCE_EVAL.STRESS_TENSOR = 'ANALYTICAL'
mySim.FORCE_EVAL.DFT.BASIS_SET_FILE_NAME = basis_set_filename
mySim.FORCE_EVAL.DFT.POTENTIAL_FILE_NAME = potential_filename
mySim.FORCE_EVAL.DFT.CHARGE = 0
mySim.FORCE_EVAL.DFT.MULTIPLICITY = 1
mySim.FORCE_EVAL.DFT.MGRID.CUTOFF = cutoff
mySim.FORCE_EVAL.DFT.MGRID.REL_CUTOFF = 50
mySim.FORCE_EVAL.DFT.MGRID.NGRIDS = 4
mySim.FORCE_EVAL.DFT.QS.METHOD = 'GPW'
mySim.FORCE_EVAL.DFT.QS.EPS_DEFAULT = 1E-7
mySim.FORCE_EVAL.DFT.QS.EXTRAPOLATION = 'ASPC'
mySim.FORCE_EVAL.DFT.POISSON.PERIODIC = periodicity
mySim.FORCE_EVAL.DFT.PRINT.E_DENSITY_CUBE.SECTION_PARAMETERS = "OFF"
mySim.FORCE_EVAL.DFT.SCF.SCF_GUESS = 'ATOMIC'
mySim.FORCE_EVAL.DFT.SCF.MAX_SCF = 30
mySim.FORCE_EVAL.DFT.SCF.EPS_SCF = scf_tolerance
mySim.FORCE_EVAL.DFT.SCF.OT.SECTION_PARAMETERS = ".TRUE."
mySim.FORCE_EVAL.DFT.SCF.OT.PRECONDITIONER = "FULL_SINGLE_INVERSE"
mySim.FORCE_EVAL.DFT.SCF.OT.MINIMIZER = "DIIS"
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.SECTION_PARAMETERS = '.TRUE.'
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.MAX_SCF = 10
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.EPS_SCF = 1e-6
mySim.FORCE_EVAL.DFT.SCF.PRINT.RESTART.SECTION_PARAMETERS = 'OFF'
mySim.FORCE_EVAL.DFT.SCF.PRINT.DM_RESTART_WRITE = '.TRUE.'
mySim.FORCE_EVAL.DFT.XC.XC_FUNCTIONAL.SECTION_PARAMETERS = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.POTENTIAL_TYPE = 'PAIR_POTENTIAL'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.TYPE = 'DFTD3'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.PARAMETER_FILE_NAME = 'dftd3.dat'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.REFERENCE_FUNCTIONAL = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.R_CUTOFF = 8
mySim.FORCE_EVAL.SUBSYS.COORD.DEFAULT_KEYWORD = project_name + ".xyz"
mySim.FORCE_EVAL.SUBSYS.init_atoms(num_atoms)
for i in range(num_unique_atoms):
mySim.FORCE_EVAL.SUBSYS.KIND[
i + 1].SECTION_PARAMETERS = unique_atom_list[i]
if basis_set == [None]:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set_setter(
unique_atom_list[i])
else:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set[
unique_atom_list[i]]
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].POTENTIAL = potential(
unique_atom_list[i], functional)
mySim.FORCE_EVAL.SUBSYS.CELL.ABC = '{a} {b} {c}'.format(
a=10 * box.lengths[0], b=10 * box.lengths[1], c=10 * box.lengths[2])
mySim.FORCE_EVAL.SUBSYS.CELL.ALPHA_BETA_GAMMA = '{a} {b} {c}'.format(
a=box.angles[0], b=box.angles[1], c=box.angles[2])
#MOTION SECTION
mySim.MOTION.GEO_OPT.OPTIMIZER = 'BFGS'
mySim.MOTION.GEO_OPT.MAX_ITER = 100
mySim.MOTION.GEO_OPT.MAX_DR = 0.003
mySim.MOTION.MD.ENSEMBLE = ensemble
mySim.MOTION.MD.STEPS = n_steps
mySim.MOTION.MD.TIMESTEP = time_step
if temperature_ensemble(ensemble):
mySim.MOTION.MD.TEMPERATURE = temperature
mySim.MOTION.MD.THERMOSTAT.TYPE = thermostat
mySim.MOTION.MD.THERMOSTAT.REGION = "MASSIVE"
mySim.MOTION.MD.THERMOSTAT.NOSE.LENGTH = 5
mySim.MOTION.MD.THERMOSTAT.NOSE.YOSHIDA = 3
mySim.MOTION.MD.THERMOSTAT.NOSE.TIMECON = 1000.0
mySim.MOTION.MD.THERMOSTAT.NOSE.MTS = 2
if pressure_ensemble(ensemble):
mySim.MOTION.MD.BAROSTAT.PRESSURE = pressure
if pressure == None:
print('you need to define pressure')
if fixed_list is not None:
mySim.MOTION.CONSTRAINT.FIXED_ATOMS.LIST = fixed_list
mySim.MOTION.MD.THERMOSTAT.REGION = "GLOBAL"
if periodicity == 'NONE':
mySim.FORCE_EVAL.DFT.POISSON.PERIODIC = 'NONE'
mySim.FORCE_EVAL.DFT.POISSON.POISSON_SOLVER = 'WAVELET'
if not is_cubic(box) and periodicity == 'NONE':
print(
'The box should be cubic for non-periodic calculations and the box must be around 15 times the size of the molecule'
)
mySim.MOTION.PRINT.STRESS.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.TRAJECTORY.EACH.MD = traj_freq
mySim.MOTION.PRINT.TRAJECTORY.FORMAT = traj_type
mySim.MOTION.PRINT.VELOCITIES.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.FORCES.SECTION_PARAMETERS = "OFF"
mySim.MOTION.PRINT.RESTART_HISTORY.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART_HISTORY.EACH.MD = 500
mySim.MOTION.PRINT.RESTART.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART.BACKUP_COPIES = 3
mySim.MOTION.PRINT.RESTART.EACH.MD = 1
mySim.write_changeLog(fn="md-changeLog.out")
mySim.write_errorLog()
mySim.write_inputFile(fn=input_filename)
print('MD input file saved as {}'.format(input_filename))
def __init__(self, lipids, ref_atoms, n_lipids_x=10, n_lipids_y=10,
area_per_lipid=1.0, lipid_box=None, spacing_z=None,
solvent=None, solvent_per_lipid=None, n_solvent=None,
solvent_density=None, solvent_mass=None, tilt=0,
random_seed=12345, mirror=True):
super(Bilayer, self).__init__()
# Santitize inputs
i = 0
while i < len(lipids):
if lipids[i][1] == 0:
lipids.remove(i)
else:
i += 1
if sum([lipid[1] for lipid in lipids]) != 1.0:
raise ValueError('Lipid fractions do not add up to 1.')
assert len(ref_atoms) == len(lipids)
self.lipids = lipids
self.ref_atoms = ref_atoms
self._lipid_box = lipid_box
# 2D Lipid locations
self.n_lipids_x = n_lipids_x
self.n_lipids_y = n_lipids_y
self.apl = area_per_lipid
self.n_lipids_per_layer = self.n_lipids_x * self.n_lipids_y
self.pattern = mb.Grid2DPattern(n_lipids_x, n_lipids_y)
self.pattern.scale(np.sqrt(self.apl * self.n_lipids_per_layer))
# Z-orientation parameters
self.tilt = tilt
if spacing_z:
self.spacing = spacing_z
else:
self.spacing = max([lipid[0].boundingbox.lengths[2]
for lipid in self.lipids]) * np.cos(self.tilt)
# Solvent parameters
if solvent:
self.solvent = solvent
if solvent_per_lipid != None:
self.n_solvent = (self.n_lipids_x *
self.n_lipids_y *
2 * solvent_per_lipid)
elif n_solvent != None:
self.n_solvent = n_solvent
else:
raise ValueError("Requires either n_solvent_per_lipid ",
"or n_solvent arguments")
# Other parameters
self.random_seed = random_seed
self.mirror = mirror
# Initialize variables and containers for lipids and solvent
self.lipid_components = mb.Compound()
self.solvent_components = mb.Compound()
self._number_of_each_lipid_per_layer = []
# Assemble the lipid layers
seed(self.random_seed)
self.tilt_about = [random(), random(), 0]
top_layer, top_lipid_labels = self.create_layer()
self.lipid_components.add(top_layer)
if self.mirror == True:
bottom_layer, bottom_lipid_labels = self.create_layer(
lipid_indices=top_lipid_labels,
flip_orientation=True)
else:
bottom_layer, bottom_lipid_labels = self.create_layer(
flip_orientation=True)
bottom_layer.translate([0, 0, 0])
self.lipid_components.add(bottom_layer)
self.lipid_components.translate_to([0, 0, 0])
# Assemble solvent components
solvent_top = self.solvate(solvent_mass, solvent_density)
solvent_bot = mb.clone(solvent_top)
solvent_top.translate_to(
[0, 0, self.spacing + 0.5 * solvent_top.boundingbox.lengths[2]]
)
solvent_bot.translate_to(
[0, 0, -self.spacing - 0.5 * solvent_top.boundingbox.lengths[2]]
)
self.solvent_components.add(solvent_top)
self.solvent_components.add(solvent_bot)
# Add all compounds
self.add(self.lipid_components)
self.add(self.solvent_components)
def populate(self, compound_dict=None, x=1, y=1, z=1):
"""Expand lattice and create compound from lattice.
Expands lattice based on user input. The user must also
pass in a dictionary that contains the keys that exist in the
basis_dict. The corresponding Compound will be the full lattice
returned to the user.
If no dictionary is passed to the user, Dummy Compounds will be used.
Parameters
----------
x : int, optional, default=1
How many iterations in the x direction.
y : int, optional, default=1
How many iterations in the y direction.
z : int, optional, default=1
How many iterations in the z direction.
compound_dict : dictionary, optional, default=None
Link between basis_dict and Compounds.
Exceptions Raised
-----------------
ValueError : incorrect x,y, or z values.
TypeError : incorrect type for basis vector
Call Restrictions
-----------------
Called after constructor by user.
"""
error_dict = {0: 'X', 1: 'Y', 2: 'Z'}
# Make sure neither x, y, z input is None
if None in [x, y, z]:
raise ValueError('Attempt to replicate None times. '
'None is not an acceptable replication '
'amount, 1 is the default.')
# Try to convert x, y, and z to int, raise a ValueError if fail
try:
x = int(x)
y = int(y)
z = int(z)
except (ValueError, TypeError):
raise ValueError('Cannot convert replication amounts into '
'integers. x= {}, y= {}, z= {} needs to '
'be an int.'.format(x, y, z))
for replication_amount, index in zip([x, y, z], range(3)):
if replication_amount < 1:
raise ValueError(
'Incorrect populate value: {} : {} is < 1. '.format(
error_dict[index], replication_amount))
if ((isinstance(compound_dict, dict)) or (compound_dict is None)):
pass
else:
raise TypeError('Compound dictionary is not of type dict. '
'{} was passed.'.format(type(compound_dict)))
cell = defaultdict(list)
[a, b, c] = self.lattice_spacing
transform_mat = self.lattice_vectors
# Unit vectors
transform_mat = np.asarray(transform_mat, dtype=np.float64)
transform_mat = np.reshape(transform_mat, newshape=(3, 3))
norms = np.linalg.norm(transform_mat, axis=1)
# Normalized vectors for change of basis
unit_vecs = np.divide(transform_mat.transpose(), norms)
# Generate new coordinates
for key, locations in self.lattice_points.items():
for coords in locations:
for replication in it.product(range(x), range(y), range(z)):
new_coords = np.asarray(coords, dtype=np.float64)
new_coords = np.reshape(new_coords, (1, 3), order='C')
new_coords[0][0] = new_coords[0][0] + replication[0]
new_coords[0][1] = new_coords[0][1] + replication[1]
new_coords[0][2] = new_coords[0][2] + replication[2]
# Change of basis to cartesian
new_coords = np.dot(unit_vecs, new_coords.transpose())
new_coords[0] = new_coords[0] * a
new_coords[1] = new_coords[1] * b
new_coords[2] = new_coords[2] * c
new_coords = np.reshape(new_coords, (1, 3), order='C')
tuple_of_coords = tuple(new_coords.flatten())
cell[key].append(tuple_of_coords)
ret_lattice = mb.Compound()
# Create (clone) a mb.Compound for the newly generate positions
if compound_dict is None:
for key_id, all_pos in cell.items():
particle = mb.Compound(name=key_id, pos=[0, 0, 0])
for pos in all_pos:
particle_to_add = mb.clone(particle)
particle_to_add.translate_to(list(pos))
ret_lattice.add(particle_to_add)
else:
for key_id, all_pos in cell.items():
if isinstance(compound_dict[key_id], mb.Compound):
compound_to_move = compound_dict[key_id]
for pos in all_pos:
tmp_comp = mb.clone(compound_to_move)
tmp_comp.translate_to(list(pos))
ret_lattice.add(tmp_comp)
else:
err_type = type(compound_dict.get(key_id))
raise TypeError('Invalid type in provided Compound '
'dictionary. For key {}, type: {} was '
'provided, not mbuild.Compound.'.format(
key_id, err_type))
# set periodicity
ret_lattice.periodicity = np.asarray([a * x, b * y, c * z],
dtype=np.float64)
warn('Periodicity of non-rectangular lattices are not valid with '
'default boxes. Only rectangular lattices are valid '
'at this time.')
# if coordinates are below a certain threshold, set to 0
tolerance = 1e-12
ret_lattice.xyz_with_ports[
ret_lattice.xyz_with_ports <= tolerance] = 0.
return ret_lattice
from __future__ import division
import numpy as np
import mbuild as mb
from atools.patterns.random_hemisphere_pattern import RandomHemispherePattern
class TipPattern(RandomHemispherePattern):
def __init__(self, chain_density, tip_radius, seed=12345):
area = 2 * np.pi * tip_radius**2
n = int(round(area * chain_density))
super(TipPattern, self).__init__(n=n, seed=seed, scale=tip_radius)
if __name__ == "__main__":
pattern = TipPattern(chain_density=2.0, tip_radius=2.0)
lj_proto = mb.Compound(name='LJ')
lj_box = mb.Compound()
for pos in pattern:
lj_particle = mb.clone(lj_proto)
lj_particle.translate(pos)
lj_box.add(lj_particle)
lj_box.save('tip-pattern.xyz', overwrite=True)
def apply_to_compound(self,
guest,
guest_port_name='down',
host=None,
backfill=None,
backfill_port_name='up',
scale=True):
"""Attach copies of a guest Compound to Ports on a host Compound.
Parameters
----------
guest : mb.Compound
The Compound prototype to be applied to the host Compound
guest_port_name : str, optional, default='down'
The name of the port located on `guest` to attach to the host
host : mb.Compound, optional, default=None
A Compound with available ports to add copies of `guest` to
backfill : mb.Compound, optional, default=None
A Compound to add to the remaining available ports on `host`
after clones of `guest` have been added for each point in the
pattern
backfill_port_name : str, optional, default='up'
The name of the port located on `backfill` to attach to the host
scale : bool, optional, default=True
Scale the points in the pattern to the lengths of the `host`'s
`boundingbox` and shift them by the `boundingbox`'s mins
Returns
-------
guests : list of mb.Compound
List of inserted guest compounds on host compound
backfills : list of mb.Compound
List of inserted backfill compounds on host compound
"""
n_ports = len(host.available_ports())
assert n_ports >= self.points.shape[0], "Not enough ports for pattern."
assert_port_exists(guest_port_name, guest)
box = host.boundingbox
if scale:
self.scale(box.lengths)
self.points += box.mins
pattern = self.points
port_positions = np.empty(shape=(n_ports, 3))
port_list = list()
for port_idx, port in enumerate(host.available_ports()):
port_positions[port_idx, :] = port['up']['middle'].pos
port_list.append(port)
used_ports = set() # Keep track of used ports for backfilling.
guests = []
for point in pattern:
closest_point_idx = np.argmin(
host.min_periodic_distance(point, port_positions))
closest_port = port_list[closest_point_idx]
used_ports.add(closest_port)
# Attach the guest to the closest port.
new_guest = clone(guest)
force_overlap(new_guest, new_guest.labels[guest_port_name],
closest_port)
guests.append(new_guest)
# Move the port as far away as possible (simpler than removing it).
# There may well be a more elegant/efficient way of doing this.
port_positions[closest_point_idx, :] = np.array(
[np.inf, np.inf, np.inf])
backfills = []
if backfill:
assert_port_exists(backfill_port_name, backfill)
# Attach the backfilling Compound to unused ports.
for port in port_list:
if port not in used_ports:
new_backfill = clone(backfill)
# Might make sense to have a backfill_port_name option...
force_overlap(new_backfill,
new_backfill.labels[backfill_port_name],
port)
backfills.append(new_backfill)
return guests, backfills
def test_spin_x_eq(self, sixpoints):
compound2 = mb.clone(sixpoints)
sixpoints.spin(np.pi * 1.23456789, np.asarray([1.0, 0.0, 0.0]))
compound2.spin(np.pi * 1.23456789, around=np.asarray([1, 0, 0]))
assert (np.allclose(compound2.xyz, sixpoints.xyz, atol=1e-16))
def solvate(
solute,
solvent,
n_solvent,
box,
overlap=0.2,
seed=12345,
sidemax=100.0,
edge=0.2,
fix_orientation=False,
temp_file=None,
update_port_locations=False,
):
"""Solvate a compound in a box of solvent using PACKMOL.
Parameters
----------
solute : mb.Compound
Compound to be placed in a box and solvated.
solvent : mb.Compound
Compound to solvate the box.
n_solvent : int
Number of solvents to be put in box.
box : mb.Box
Box to be filled by compounds.
overlap : float, units nm, default=0.2
Minimum separation between atoms of different molecules.
seed : int, default=12345
Random seed to be passed to PACKMOL.
sidemax : float, optional, default=100.0
Needed to build an initial approximation of the molecule distribution in
PACKMOL. All system coordinates must fit with in +/- sidemax, so
increase sidemax accordingly to your final box size
edge : float, units nm, default=0.2
Buffer at the edge of the box to not place molecules. This is necessary
in some systems because PACKMOL does not account for periodic boundary
conditions in its optimization.
fix_orientation : bool
Specify if solvent should not be rotated when filling box,
default=False.
temp_file : str, default=None
File name to write PACKMOL raw output to.
update_port_locations : bool, default=False
After packing, port locations can be updated, but since compounds can be
rotated, port orientation may be incorrect.
Returns
-------
solvated : mb.Compound
"""
# check that the user has the PACKMOL binary on their PATH
_check_packmol(PACKMOL)
(box, min_tmp, max_tmp) = _validate_box(box)
if not isinstance(solvent, (list, set)):
solvent = [solvent]
if not isinstance(n_solvent, (list, set)):
n_solvent = [n_solvent]
if not isinstance(fix_orientation, (list, set)):
fix_orientation = [fix_orientation] * len(solvent)
if len(solvent) != len(n_solvent):
raise ValueError(
"`n_solvent` and `n_solvent` must be of equal length.")
# In angstroms for packmol.
box_mins = np.asarray(min_tmp) * 10
box_maxs = np.asarray(max_tmp) * 10
overlap *= 10
center_solute = (box_maxs + box_mins) / 2
# Apply edge buffer
box_maxs = np.subtract(box_maxs, edge * 10)
box_mins = np.add(box_mins, edge * 10)
# Build the input file for each compound and call packmol.
solvated_xyz = _new_xyz_file()
solute_xyz = _new_xyz_file()
# generate list of temp files for the solvents
solvent_xyz_list = list()
try:
solute.save(solute_xyz.name, overwrite=True)
input_text = PACKMOL_HEADER.format(
overlap, solvated_xyz.name, seed,
sidemax * 10) + PACKMOL_SOLUTE.format(solute_xyz.name,
*center_solute.tolist())
for (solv, m_solvent, rotate) in zip(solvent, n_solvent,
fix_orientation):
m_solvent = int(m_solvent)
solvent_xyz = _new_xyz_file()
solvent_xyz_list.append(solvent_xyz)
solv.save(solvent_xyz.name, overwrite=True)
input_text += PACKMOL_BOX.format(
solvent_xyz.name,
m_solvent,
box_mins[0],
box_mins[1],
box_mins[2],
box_maxs[0],
box_maxs[1],
box_maxs[2],
PACKMOL_CONSTRAIN if rotate else "",
)
_run_packmol(input_text, solvated_xyz, temp_file)
# Create the topology and update the coordinates.
solvated = Compound()
solvated.add(clone(solute))
solvated = _create_topology(solvated, solvent, n_solvent)
solvated.update_coordinates(
solvated_xyz.name, update_port_locations=update_port_locations)
finally:
for file_handle in solvent_xyz_list:
file_handle.close()
os.unlink(file_handle.name)
solvated_xyz.close()
solute_xyz.close()
os.unlink(solvated_xyz.name)
os.unlink(solute_xyz.name)
return solvated
def __init__(self,
radius=2,
angle=90.0,
fluid=None,
density=None,
lattice=None,
lattice_compound=None,
x=None,
y=None):
super(Droplet, self).__init__()
if fluid is None:
raise ValueError('Fluid droplet compounds must be specified')
if density is None:
raise ValueError('Fluid density must be specified (units kg/m^3)')
if x:
if x < radius * 4:
raise ValueError(
'Dimension x of sheet must be at least radius * 4')
elif x > 100:
raise ValueError(
'Dimension x of sheet must be less than 100 nm')
else:
x = radius * 4
if y:
if y < radius * 4:
raise ValueError(
'Dimension y of sheet must be at least radius * 4')
elif y > 100:
raise ValueError(
'Dimension y of sheet must be less than 100 nm')
else:
y = radius * 4
# Default to graphene lattice
if lattice is None:
if lattice_compound is not None:
raise ValueError(
'If Lattice is None, defaults to a Graphene surface. ' +
'In this case, do not specify lattice_compound.')
lattice_compound = mbuild.Compound(name='C')
lattice_spacing = [0.2456, 0.2456, 0.335]
angles = [90.0, 90.0, 120.0]
carbon_locations = [[0, 0, 0], [2 / 3, 1 / 3, 0]]
basis = {lattice_compound.name: carbon_locations}
lattice = mbuild.Lattice(lattice_spacing=lattice_spacing,
angles=angles,
lattice_points=basis)
compound_dict = {lattice_compound.name: lattice_compound}
factor = np.cos(np.pi / 6) # fixes non-cubic lattice
# Estimate the number of lattice repeat units
replicate = [int(x / 0.2456), int(y / 0.2456) * (1 / factor)]
lat = lattice.populate(compound_dict=compound_dict,
x=replicate[0],
y=replicate[1],
z=3)
for particle in lat.particles():
if particle.xyz[0][0] < 0:
particle.xyz[0][0] += lat.periodicity[0]
lat.periodicity[1] *= factor
else:
if lattice_compound is None:
raise ValueError('Lattice compounds must be specified')
if not np.all(lattice.angles == 90.0):
raise ValueError(
'Currently, only cubic lattices are supported. ' +
'If using Graphene, do not pass in a Lattice.')
compound_dict = {lattice_compound.name: lattice_compound}
lat = lattice.populate(compound_dict=compound_dict,
x=int(x / lattice.lattice_spacing[0]),
y=int(y / lattice.lattice_spacing[1]),
z=int(1.5 / lattice.lattice_spacing[2]))
sheet = mbuild.clone(lat)
self.surface_height = np.max(sheet.xyz, axis=0)[2]
coords = list(sheet.periodicity)
height = get_height(radius, angle)
sphere_coords = [coords[0] / 2, coords[1] / 2, radius, radius]
sphere = mbuild.fill_sphere(compound=fluid,
sphere=sphere_coords,
density=density)
to_remove = []
for child in sphere.children:
for atom_coords in child.xyz:
if height > radius:
if atom_coords[2] < height - radius:
to_remove += child
break
else:
if atom_coords[2] < height:
to_remove += child
break
sphere.remove(to_remove)
sheet.name = 'LAT'
sphere.name = 'FLD'
sphere.xyz -= [0, 0, np.min(sphere.xyz, axis=0)[2]]
sphere.xyz += [0, 0, self.surface_height + 0.3]
self.add(sheet)
self.add(sphere)
self.periodicity[0] = sheet.periodicity[0]
self.periodicity[1] = sheet.periodicity[1]
self.periodicity[2] = radius * 5
def _add_backfill(self, backfill, backfill_port_name):
for port in self['surface'].available_ports():
backfill_clone = mb.clone(backfill)
mb.force_overlap(backfill_clone,
backfill_clone[backfill_port_name], port)
self.add(backfill_clone)
def __init__(self, chain_length, internal_group, locations,
terminal_group):
super(Alkylsilane, self).__init__()
module = __import__('atools.lib.moieties.one_port.' + terminal_group)
class_ = getattr(module.lib.moieties.one_port, terminal_group.title())
tgroup = class_()
hmodule = __import__('atools.lib.moieties.multiple_ports.' +
internal_group)
hclass_ = getattr(hmodule.lib.moieties.multiple_ports,
internal_group.title())
hgroup = hclass_()
# Determine alkane segments
if isinstance(locations, int):
locations = [locations]
locations.sort()
silane = Silane()
self.add(silane, 'silane')
self.add(silane['down'], 'down', containment=False)
if 0 in locations:
'''
self.add(hgroup, 'hgroup')
mb.force_overlap(self['silane'], self['silane']['up'],
self['hgroup']['down'])
'''
current_segment = silane
else:
first_length = locations[0]
first_segment = Alkane(first_length,
cap_front=False,
cap_end=False)
self.add(first_segment, 'bottom_chain')
mb.force_overlap(self['silane'], self['silane']['up'],
self['bottom_chain']['down'])
current_segment = first_segment
c_remove = 0
if internal_group in ['amide', 'hemiacetal']:
c_remove += 1
for i, loc in enumerate(locations[1:]):
hgroup_clone = mb.clone(hgroup)
self.add(hgroup_clone, 'hgroup{}'.format(i + 1))
mb.force_overlap(self['hgroup{}'.format(i + 1)],
self['hgroup{}'.format(i + 1)]['down'],
current_segment['up'])
current_segment = hgroup_clone
length = loc - locations[i] - 1 - c_remove
if length > 0:
segment = Alkane(length, cap_front=False, cap_end=False)
self.add(segment, 'internal_chain{}'.format(i + 1))
current_segment = segment
mb.force_overlap(
self['internal_chain{}'.format(i + 1)],
self['internal_chain{}'.format(i + 1)]['down'],
self['hgroup{}'.format(i + 1)]['up'])
self.add(hgroup, 'hgroup')
mb.force_overlap(self['hgroup'], self['hgroup']['down'],
current_segment['up'])
last_length = chain_length - locations[-1] - 1 - c_remove
if last_length:
last_segment = Alkane(last_length, cap_front=False, cap_end=False)
self.add(last_segment, 'top_chain')
mb.force_overlap(self['top_chain'], self['top_chain']['down'],
self['hgroup']['up'])
else:
hydrogen = H()
self.add(hydrogen, 'H-cap')
mb.force_overlap(self['H-cap'], self['H-cap']['up'],
self['hgroup']['up'])
self.add(tgroup, 'terminal_group')
mb.force_overlap(self['terminal_group'],
self['terminal_group']['down'],
self['top_chain']['up'])
def fill_region(compound, n_compounds, region, overlap=0.2,
seed=12345, edge=0.2, fix_orientation=False, temp_file=None):
"""Fill a region of a box with a compound using packmol.
Parameters
----------
compound : mb.Compound or list of mb.Compound
Compound or list of compounds to be put in region.
n_compounds : int or list of int
Number of compounds to be put in region.
region : mb.Box or list of mb.Box
Region to be filled by compounds.
overlap : float, units nm, default=0.2
Minimum separation between atoms of different molecules.
seed : int, default=12345
Random seed to be passed to PACKMOL.
edge : float, units nm, default=0.2
Buffer at the edge of the region to not place molecules. This is
necessary in some systems because PACKMOL does not account for
periodic boundary conditions in its optimization.
fix_orientation : bool or list of bools
Specify that compounds should not be rotated when filling the box,
default=False.
temp_file : str, default=None
File name to write PACKMOL's raw output to.
Returns
-------
filled : mb.Compound
If using mulitple regions and compounds, the nth value in each list are used in order.
For example, if the third compound will be put in the third region using the third value in n_compounds.
"""
_check_packmol(PACKMOL)
if not isinstance(compound, (list, set)):
compound = [compound]
if not isinstance(n_compounds, (list, set)):
n_compounds = [n_compounds]
if not isinstance(fix_orientation, (list, set)):
fix_orientation = [fix_orientation]*len(compound)
if compound is not None and n_compounds is not None:
if len(compound) != len(n_compounds):
msg = ("`compound` and `n_compounds` must be of equal length.")
raise ValueError(msg)
if compound is not None:
if len(compound) != len(fix_orientation):
msg = ("`compound`, `n_compounds`, and `fix_orientation` must be of equal length.")
raise ValueError(msg)
# See if region is a single region or list
if isinstance(region, Box): # Cannot iterate over boxes
region = [region]
elif not any(isinstance(reg, (list, set, Box)) for reg in region):
region = [region]
region = [_validate_box(reg) for reg in region]
# In angstroms for packmol.
overlap *= 10
# Build the input file and call packmol.
filled_pdb = tempfile.mkstemp(suffix='.pdb')[1]
input_text = PACKMOL_HEADER.format(overlap, filled_pdb, seed)
for comp, m_compounds, reg, rotate in zip(compound, n_compounds, region, fix_orientation):
m_compounds = int(m_compounds)
compound_pdb = tempfile.mkstemp(suffix='.pdb')[1]
comp.save(compound_pdb, overwrite=True)
reg_mins = reg.mins * 10
reg_maxs = reg.maxs * 10
reg_maxs -= edge * 10 # Apply edge buffer
input_text += PACKMOL_BOX.format(compound_pdb, m_compounds,
reg_mins[0], reg_mins[1], reg_mins[2],
reg_maxs[0], reg_maxs[1], reg_maxs[2],
PACKMOL_CONSTRAIN if rotate else "")
_run_packmol(input_text, filled_pdb, temp_file)
# Create the topology and update the coordinates.
filled = Compound()
for comp, m_compounds in zip(compound, n_compounds):
for _ in range(m_compounds):
filled.add(clone(comp))
filled.update_coordinates(filled_pdb)
return filled
def test_init_with_subcompounds3(self, ethane, h2o):
compound = mb.Compound([ethane, [h2o, mb.clone(h2o)]])
assert compound.n_particles == 8 + 2 * 3
assert compound.n_bonds == 7 + 2 * 2
def fill_box(compound, n_compounds=None, box=None, density=None, overlap=0.2,
seed=12345, edge=0.2, compound_ratio=None,
aspect_ratio=None, fix_orientation=False, temp_file=None):
"""Fill a box with a compound using packmol.
Two arguments of `n_compounds, box, and density` must be specified.
If `n_compounds` and `box` are not None, the specified number of
n_compounds will be inserted into a box of the specified size.
If `n_compounds` and `density` are not None, the corresponding box
size will be calculated internally. In this case, `n_compounds`
must be an int and not a list of int.
If `box` and `density` are not None, the corresponding number of
compounds will be calculated internally.
For the cases in which `box` is not specified but generated internally,
the default behavior is to calculate a cubic box. Optionally,
`aspect_ratio` can be passed to generate a non-cubic box.
Parameters
----------
compound : mb.Compound or list of mb.Compound
Compound or list of compounds to be put in box.
n_compounds : int or list of int
Number of compounds to be put in box.
box : mb.Box
Box to be filled by compounds.
density : float, units kg/m^3, default=None
Target density for the system in macroscale units. If not None, one of
`n_compounds` or `box`, but not both, must be specified.
overlap : float, units nm, default=0.2
Minimum separation between atoms of different molecules.
seed : int, default=12345
Random seed to be passed to PACKMOL.
edge : float, units nm, default=0.2
Buffer at the edge of the box to not place molecules. This is necessary
in some systems because PACKMOL does not account for periodic boundary
conditions in its optimization.
compound_ratio : list, default=None
Ratio of number of each compound to be put in box. Only used in the
case of `density` and `box` having been specified, `n_compounds` not
specified, and more than one `compound`.
aspect_ratio : list of float
If a non-cubic box is desired, the ratio of box lengths in the x, y,
and z directions.
fix_orientation : bool or list of bools
Specify that compounds should not be rotated when filling the box,
default=False.
temp_file : str, default=None
File name to write PACKMOL's raw output to.
Returns
-------
filled : mb.Compound
"""
_check_packmol(PACKMOL)
arg_count = 3 - [n_compounds, box, density].count(None)
if arg_count != 2:
msg = ("Exactly 2 of `n_compounds`, `box`, and `density` "
"must be specified. {} were given.".format(arg_count))
raise ValueError(msg)
if box is not None:
box = _validate_box(box)
if not isinstance(compound, (list, set)):
compound = [compound]
if n_compounds is not None and not isinstance(n_compounds, (list, set)):
n_compounds = [n_compounds]
if not isinstance(fix_orientation, (list, set)):
fix_orientation = [fix_orientation]*len(compound)
if compound is not None and n_compounds is not None:
if len(compound) != len(n_compounds):
msg = ("`compound` and `n_compounds` must be of equal length.")
raise ValueError(msg)
if compound is not None:
if len(compound) != len(fix_orientation):
msg = ("`compound`, `n_compounds`, and `fix_orientation` must be of equal length.")
raise ValueError(msg)
if density is not None:
if box is None and n_compounds is not None:
total_mass = np.sum([n*np.sum([a.mass for a in c.to_parmed().atoms])
for c,n in zip(compound, n_compounds)])
# Conversion from (amu/(kg/m^3))**(1/3) to nm
L = (total_mass/density)**(1/3)*1.1841763
if aspect_ratio is None:
box = _validate_box(Box(3*[L]))
else:
L *= np.prod(aspect_ratio) ** (-1/3)
box = _validate_box(Box([val*L for val in aspect_ratio]))
if n_compounds is None and box is not None:
if len(compound) == 1:
compound_mass = np.sum([a.mass for a in compound[0].to_parmed().atoms])
# Conversion from kg/m^3 / amu * nm^3 to dimensionless units
n_compounds = [int(density/compound_mass*np.prod(box.lengths)*.60224)]
else:
if compound_ratio is None:
msg = ("Determing `n_compounds` from `density` and `box` "
"for systems with more than one compound type requires"
"`compound_ratio`")
raise ValueError(msg)
if len(compound) != len(compound_ratio):
msg = ("Length of `compound_ratio` must equal length of "
"`compound`")
raise ValueError(msg)
prototype_mass = 0
for c, r in zip(compound, compound_ratio):
prototype_mass += r * np.sum([a.mass for a in c.to_parmed().atoms])
# Conversion from kg/m^3 / amu * nm^3 to dimensionless units
n_prototypes = int(density/prototype_mass*np.prod(box.lengths)*.60224)
n_compounds = list()
for c in compound_ratio:
n_compounds.append(int(n_prototypes * c))
# In angstroms for packmol.
box_mins = box.mins * 10
box_maxs = box.maxs * 10
overlap *= 10
# Apply edge buffer
box_maxs -= edge * 10
# Build the input file for each compound and call packmol.
filled_pdb = tempfile.mkstemp(suffix='.pdb')[1]
input_text = PACKMOL_HEADER.format(overlap, filled_pdb, seed)
for comp, m_compounds, rotate in zip(compound, n_compounds, fix_orientation):
m_compounds = int(m_compounds)
compound_pdb = tempfile.mkstemp(suffix='.pdb')[1]
comp.save(compound_pdb, overwrite=True)
input_text += PACKMOL_BOX.format(compound_pdb, m_compounds,
box_mins[0], box_mins[1], box_mins[2],
box_maxs[0], box_maxs[1], box_maxs[2],
PACKMOL_CONSTRAIN if rotate else "")
_run_packmol(input_text, filled_pdb, temp_file)
# Create the topology and update the coordinates.
filled = Compound()
for comp, m_compounds in zip(compound, n_compounds):
for _ in range(m_compounds):
filled.add(clone(comp))
filled.update_coordinates(filled_pdb)
filled.periodicity = np.asarray(box.lengths, dtype=np.float32)
return filled
solvent=[water, na, cl],
n_solvent=[5200, 400, 400])
box = mb.Box(system.periodicity)
# #### Separate molecules into different compounds
# Because we are going to apply multiple force fields, we need to separate the waters and graphene into separate mBuild compounds. Calling `apply` will apply the forcefield to the compounds and convert them to parametrized ParmEd `Structures`
# In[ ]:
water = mb.Compound()
ions = mb.Compound()
graphene = mb.Compound()
for child in system.children:
if child.name == 'SOL':
water.add(mb.clone(child))
elif child.name in ['Na', 'Cl']:
ions.add(mb.clone(child))
else:
graphene.add(mb.clone(child))
water_pmd = spce.apply(water, residues='SOL')
ions_pmd = jc.apply(ions, residues=['Na', 'Cl'])
pore_pmd = c_ff.apply(graphene)
# #### Now we will combine the two paramterezed ParmEd structures and save them as `gro` and `top` files
# In[ ]:
system = water_pmd + pore_pmd + ions_pmd
system.box[:3] = box.maxs * 10.0
def test_add_label_exists(self, ethane, h2o):
ethane.add(h2o, label='water')
with pytest.raises(MBuildError):
ethane.add(mb.clone(h2o), label='water')
def _visualize_py3dmol(self,
show_ports=False,
color_scheme={},
show_atomistic=False,
scale=1.0):
"""
Visualize the Compound using py3Dmol.
Allows for visualization of a Compound within a Jupyter Notebook.
Modified to show atomistic elements (translucent) with larger CG beads.
Parameters
----------
show_ports : bool, optional, default=False
Visualize Ports in addition to Particles
color_scheme : dict, optional
Specify coloring for non-elemental particles
keys are strings of the particle names
values are strings of the colors
i.e. {'_CGBEAD': 'blue'}
show_atomistic : show the atomistic structure stored in CG_Compound.atomistic
Returns
------
view : py3Dmol.view
"""
py3Dmol = import_("py3Dmol")
atom_names = []
if self.atomistic is not None and show_atomistic:
atomistic = mb.clone(self.atomistic)
for particle in atomistic.particles():
if not particle.name:
particle.name = "UNK"
else:
if (particle.name != 'Compound') and (particle.name !=
'CG_Compound'):
atom_names.append(particle.name)
coarse = mb.clone(self)
modified_color_scheme = {}
for name, color in color_scheme.items():
# Py3dmol does some element string conversions,
# first character is as-is, rest of the characters are lowercase
new_name = name[0] + name[1:].lower()
modified_color_scheme[new_name] = color
modified_color_scheme[name] = color
cg_names = []
for particle in coarse.particles():
if not particle.name:
particle.name = "UNK"
else:
if (particle.name != 'Compound') and (particle.name !=
'CG_Compound'):
cg_names.append(particle.name)
tmp_dir = tempfile.mkdtemp()
view = py3Dmol.view()
if atom_names:
atomistic.save(
os.path.join(tmp_dir, "atomistic_tmp.mol2"),
show_ports=show_ports,
overwrite=True,
)
# atomistic
with open(os.path.join(tmp_dir, "atomistic_tmp.mol2"), "r") as f:
view.addModel(f.read(), "mol2", keepH=True)
if cg_names:
opacity = 0.6
else:
opacity = 1.0
view.setStyle({
"stick": {
"radius": 0.2 * scale,
"opacity": opacity,
"color": "grey"
},
"sphere": {
"scale": 0.3 * scale,
"opacity": opacity,
"colorscheme": modified_color_scheme,
},
})
# coarse
if cg_names:
coarse.save(
os.path.join(tmp_dir, "coarse_tmp.mol2"),
show_ports=show_ports,
overwrite=True,
)
with open(os.path.join(tmp_dir, "coarse_tmp.mol2"), "r") as f:
view.addModel(f.read(), "mol2", keepH=True)
if self.atomistic is None:
scale = 0.3 * scale
else:
scale = 0.7 * scale
view.setStyle(
{"atom": cg_names},
{
"stick": {
"radius": 0.2 * scale,
"opacity": 1,
"color": "grey"
},
"sphere": {
"scale": scale,
"opacity": 1,
"colorscheme": modified_color_scheme,
},
},
)
view.zoomTo()
return view
top_lipids.append([lipid_molecule, lipid_offset])
bot_lipids.append([lipid_molecule, lipid_offset])
index += 1
if len(bot_lipids) != n_lipid:
sys.exit('Error setting up system components')
# Generate bottom layer randomly
bot_layer = mb.Compound()
for i in range(n_x):
for j in range(n_y):
# Randomly select a lipid that has not yet been selected
random_lipid = np.random.randint(0, len(bot_lipids))
# Create the mbuild Molecule for this lipid
molecule_i = bot_lipids.pop(random_lipid)
molecule_to_add = mb.clone(molecule_i[0])
# Apply tilt angle
mb.spin_y(molecule_to_add, tilt_angle)
# Apply z_offset
z_offset = molecule_i[1]
#z_offset = 0
# Apply APL and z_offset to identify the position for the molecule in the grid
position = [i * spacing, j * spacing, z_offset]
mb.translate(molecule_to_add, position)
# Add the new molecule to the layer
bot_layer.add(molecule_to_add)
# Generate the top layer of lipids randomly
top_layer = mb.Compound()
for i in range(n_x):
for j in range(n_y):
def _clone(self, clone_of=None, root_container=None):
newone = super(Port, self)._clone(clone_of, root_container)
newone.anchor = clone(self.anchor, clone_of, root_container)
newone.used = self.used
return newone
def populate(self, compound_dict=None, x=1, y=1, z=1):
"""Expand lattice and create compound from lattice.
Expands lattice based on user input. The user must also
pass in a dictionary that contains the keys that exist in the
basis_dict. The corresponding Compound will be the full lattice
returned to the user.
If no dictionary is passed to the user, Dummy Compounds will be used.
Parameters
----------
x : int, optional, default=1
How many iterations in the x direction.
y : int, optional, default=1
How many iterations in the y direction.
z : int, optional, default=1
How many iterations in the z direction.
compound_dict : dictionary, optional, default=None
Link between basis_dict and Compounds.
Exceptions Raised
-----------------
ValueError : incorrect x,y, or z values.
TypeError : incorrect type for basis vector
Call Restrictions
-----------------
Called after constructor by user.
"""
x, y, z = self._sanitize_populate_args(x=x, y=y, z=z)
if ((isinstance(compound_dict, dict)) or (compound_dict is None)):
pass
else:
raise TypeError('Compound dictionary is not of type dict. '
'{} was passed.'.format(type(compound_dict)))
cell = defaultdict(list)
[a, b, c] = self.lattice_spacing
transform_mat = self.lattice_vectors
# Unit vectors
transform_mat = np.asarray(transform_mat, dtype=np.float64)
transform_mat = np.reshape(transform_mat, newshape=(3,3))
norms = np.linalg.norm(transform_mat, axis=1)
# Normalized vectors for change of basis
unit_vecs = np.divide(transform_mat.transpose(), norms)
# Generate new coordinates
for key, locations in self.lattice_points.items():
for coords in locations:
for replication in it.product(range(x), range(y), range(z)):
new_coords = np.asarray(coords, dtype=np.float64)
new_coords = np.reshape(new_coords, (1, 3), order='C')
new_coords[0][0] = new_coords[0][0] + replication[0]
new_coords[0][1] = new_coords[0][1] + replication[1]
new_coords[0][2] = new_coords[0][2] + replication[2]
# Change of basis to cartesian
new_coords = np.dot(unit_vecs, new_coords.transpose())
new_coords[0] = new_coords[0] * a
new_coords[1] = new_coords[1] * b
new_coords[2] = new_coords[2] * c
new_coords = np.reshape(new_coords, (1, 3), order='C')
tuple_of_coords = tuple(new_coords.flatten())
cell[key].append(tuple_of_coords)
ret_lattice = mb.Compound()
# Create (clone) a mb.Compound for the newly generate positions
if compound_dict is None:
for key_id, all_pos in cell.items():
particle = mb.Compound(name=key_id, pos=[0, 0, 0])
for pos in all_pos:
particle_to_add = mb.clone(particle)
particle_to_add.translate_to(list(pos))
ret_lattice.add(particle_to_add)
else:
for key_id, all_pos in cell.items():
if isinstance(compound_dict[key_id], mb.Compound):
compound_to_move = compound_dict[key_id]
for pos in all_pos:
tmp_comp = mb.clone(compound_to_move)
tmp_comp.translate_to(list(pos))
ret_lattice.add(tmp_comp)
else:
err_type = type(compound_dict.get(key_id))
raise TypeError('Invalid type in provided Compound '
'dictionary. For key {}, type: {} was '
'provided, not mbuild.Compound.'
.format(key_id, err_type))
# set periodicity, currently assuming rectangular system
if not np.all(np.allclose(self.angles, [90.0, 90.0, 90.0])):
warn('Periodicity of non-rectangular lattices are not valid with '
'default boxes. Only rectangular lattices are valid '
'at this time.')
ret_lattice.periodicity = np.asarray([a * x, b * y, c * z], dtype=np.float64)
# if coordinates are below a certain threshold, set to 0
tolerance = 1e-12
ret_lattice.xyz_with_ports[ret_lattice.xyz_with_ports <= tolerance] = 0.
return ret_lattice
def run_md_pre(molecule, functional, project_name, dire, temperature,
box_length, number_of_molecules, simulation_time, CUTOFF,
SCF_tolerence, basis_set, ensemble, timestep, thermostat,
table):
current_molecule = mb.clone(molecule)
molecule_pmd = mb.clone(current_molecule)
molecule_pmd = molecule_pmd.to_parmed()
atom_list, mass_list, total_mass = info_molecule(molecule_pmd)
unique_atom_list = remove_duplicate(atom_list)
num_atoms = len(atom_list)
num_unique_atoms = len(unique_atom_list)
unique_atom_list.sort()
box = mb.Box(lengths=[box_length, box_length, box_length])
current_molecule.xyz = table
print(number_of_molecules)
box_of_molecule = mb.fill_box(compound=current_molecule,
n_compounds=number_of_molecules,
box=box)
filename = project_name + ".xyz"
box_of_molecule.save(filename, overwrite=True)
with open(project_name + ".xyz", 'r') as fin:
data = fin.read().splitlines(True)
with open(project_name + ".xyz", 'w') as fout:
fout.writelines(data[2:])
if basis_set[0] == None:
basis_set = basis_set * num_unique_atoms
if thermostat == None:
thermostat = 'NOSE'
if CUTOFF == None:
CUTOFF = 900
if SCF_tolerence == None:
SCF_tolerence = 1e-6
if ensemble == None:
ensemble = 'NVT'
mySim = sim.SIM()
mySim.GLOBAL.RUN_TYPE = "MD"
mySim.GLOBAL.PROJECT = project_name + "pre"
mySim.GLOBAL.PRINT_LEVEL = "LOW"
#FORCE EVAL SECTION
mySim.FORCE_EVAL.METHOD = 'QUICKSTEP'
mySim.FORCE_EVAL.STRESS_TENSOR = 'ANALYTICAL'
mySim.FORCE_EVAL.DFT.BASIS_SET_FILE_NAME = dire + 'BASIS_MOLOPT'
mySim.FORCE_EVAL.DFT.POTENTIAL_FILE_NAME = dire + 'GTH_POTENTIALS'
mySim.FORCE_EVAL.DFT.CHARGE = 0
mySim.FORCE_EVAL.DFT.MULTIPLICITY = 1
mySim.FORCE_EVAL.DFT.MGRID.CUTOFF = CUTOFF
mySim.FORCE_EVAL.DFT.MGRID.REL_CUTOFF = 50
mySim.FORCE_EVAL.DFT.MGRID.NGRIDS = 4
mySim.FORCE_EVAL.DFT.QS.METHOD = 'GPW'
mySim.FORCE_EVAL.DFT.QS.EPS_DEFAULT = 1E-8
mySim.FORCE_EVAL.DFT.QS.EXTRAPOLATION = 'ASPC'
mySim.FORCE_EVAL.DFT.POISSON.PERIODIC = "XYZ"
mySim.FORCE_EVAL.DFT.PRINT.E_DENSITY_CUBE.SECTION_PARAMETERS = "OFF"
mySim.FORCE_EVAL.DFT.SCF.SCF_GUESS = 'ATOMIC'
mySim.FORCE_EVAL.DFT.SCF.MAX_SCF = 2
mySim.FORCE_EVAL.DFT.SCF.EPS_SCF = SCF_tolerence
mySim.FORCE_EVAL.DFT.SCF.OT.SECTION_PARAMETERS = ".TRUE."
mySim.FORCE_EVAL.DFT.SCF.OT.PRECONDITIONER = "FULL_SINGLE_INVERSE"
mySim.FORCE_EVAL.DFT.SCF.OT.MINIMIZER = "DIIS"
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.SECTION_PARAMETERS = '.TRUE.'
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.MAX_SCF = 10
mySim.FORCE_EVAL.DFT.SCF.OUTER_SCF.EPS_SCF = 1e-6
mySim.FORCE_EVAL.DFT.SCF.PRINT.RESTART.SECTION_PARAMETERS = 'OFF'
mySim.FORCE_EVAL.DFT.SCF.PRINT.DM_RESTART_WRITE = '.TRUE.'
mySim.FORCE_EVAL.DFT.XC.XC_FUNCTIONAL.SECTION_PARAMETERS = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.POTENTIAL_TYPE = 'PAIR_POTENTIAL'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.TYPE = 'DFTD3'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.PARAMETER_FILE_NAME = 'dftd3.dat'
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.REFERENCE_FUNCTIONAL = functional
mySim.FORCE_EVAL.DFT.XC.VDW_POTENTIAL.PAIR_POTENTIAL.R_CUTOFF = 11
mySim.FORCE_EVAL.SUBSYS.COORD.DEFAULT_KEYWORD = project_name + ".xyz"
mySim.FORCE_EVAL.SUBSYS.init_atoms(num_atoms)
for i in range(num_unique_atoms):
mySim.FORCE_EVAL.SUBSYS.KIND[
i + 1].SECTION_PARAMETERS = unique_atom_list[i]
if basis_set[i] == None:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set_setter(
unique_atom_list[i])
else:
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].BASIS_SET = basis_set[i]
mySim.FORCE_EVAL.SUBSYS.KIND[i + 1].POTENTIAL = potential(
unique_atom_list[i], functional)
mySim.FORCE_EVAL.SUBSYS.CELL.ABC = '{L} {L} {L}'.format(L=10 * box_length)
#MOTION SECTION
mySim.MOTION.GEO_OPT.OPTIMIZER = 'BFGS'
mySim.MOTION.GEO_OPT.MAX_ITER = 100
mySim.MOTION.GEO_OPT.MAX_DR = 0.003
mySim.MOTION.MD.ENSEMBLE = ensemble
mySim.MOTION.MD.STEPS = 1
mySim.MOTION.MD.TIMESTEP = 0.2
mySim.MOTION.MD.TEMPERATURE = temperature
mySim.MOTION.MD.THERMOSTAT.TYPE = thermostat
mySim.MOTION.MD.THERMOSTAT.REGION = "MASSIVE"
mySim.MOTION.MD.THERMOSTAT.NOSE.LENGTH = 3
mySim.MOTION.MD.THERMOSTAT.NOSE.YOSHIDA = 3
mySim.MOTION.MD.THERMOSTAT.NOSE.TIMECON = 1000.0
mySim.MOTION.MD.THERMOSTAT.NOSE.MTS = 2
#mySim.MOTION.MD.PRINT.ENERGY.EACH.MD = 20
#mySim.MOTION.MD.PRINT.PROGRAM_RUN_INFO.EACH.MD = 20
#mySim.MOTION.MD.AVERAGES.SECTION_PARAMETERS= ".falbmbjse."
mySim.MOTION.PRINT.STRESS.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.TRAJECTORY.EACH.MD = 1
mySim.MOTION.PRINT.VELOCITIES.SECTION_PARAMETERS = 'OFF'
mySim.MOTION.PRINT.FORCES.SECTION_PARAMETERS = "OFF"
mySim.MOTION.PRINT.RESTART_HISTORY.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART_HISTORY.EACH.MD = 500
mySim.MOTION.PRINT.RESTART.SECTION_PARAMETERS = "ON"
mySim.MOTION.PRINT.RESTART.BACKUP_COPIES = 3
mySim.MOTION.PRINT.RESTART.EACH.MD = 1
mySim.write_changeLog(fn="md-pre-changeLog.out")
mySim.write_errorLog()
mySim.write_inputFile(fn='md-pre.inp')
def _add_chemisorbed_chains(self, chain, spacing, n_chemisorbed, n_chains,
chain_port_name, verbose):
"""Attach chains to the surface...
"""
available_sites = np.array(self['surface'].available_ports())
if n_chemisorbed and n_chains and n_chains < n_chemisorbed:
raise Exception(
'Cannot specify `n_chains` less than `n_chemisorbed`!')
added_chains = 0
while len(available_sites) > 0:
if ((n_chemisorbed and added_chains == n_chemisorbed)
or (n_chains and added_chains == n_chains)):
available_sites = []
else:
binding_site = random.choice(available_sites)
new_chain = mb.clone(chain)
self.crosslink_graph.add_node(
new_chain.available_ports()[0].anchor,
pos=(binding_site.pos[0], binding_site.pos[1]),
surface_bound=True)
si = list(new_chain.particles_by_name('Si'))[0]
self.add(new_chain, 'chemisorbed_chain[$]')
mb.force_overlap(new_chain, new_chain[chain_port_name],
binding_site)
available_sites = [
site for site in available_sites
if (site != binding_site and self.min_periodic_distance(
np.array([site.pos[0], site.pos[1], 0]),
np.array([binding_site.pos[0], binding_site.pos[1], 0
])) > spacing)
]
added_chains += 1
if verbose:
print('Added chemisorbed chain {}'
''.format(len(self['chemisorbed_chain'])))
print('{} available sites remaining'.format(
len(available_sites)))
if n_chemisorbed and added_chains < n_chemisorbed:
print(
'Maximum number of chemisorbed chains without overlaps has been '
'reached! However, additional chains will be added to satisfy '
'n_chemisorbed requirement.')
while added_chains < n_chemisorbed:
available_sites = np.array(
[site for site in self['surface'].available_ports()])
chain_locations = np.array(
[chain.pos for chain in self['chemisorbed_chain']])
chain_locations[:, 2] = 0
min_dists = []
for site in available_sites:
min_dist = np.min([
self.min_periodic_distance(
[site.pos[0], site.pos[1], 0.0], loc)
for loc in chain_locations
])
min_dists.append(min_dist)
binding_site = available_sites[np.argmax(min_dists)]
new_chain = mb.clone(chain)
self.crosslink_graph.add_node(
new_chain.available_ports()[0].anchor,
pos=(binding_site.pos[0], binding_site.pos[1]),
surface_bound=True)
si = list(new_chain.particles_by_name('Si'))[0]
self.add(new_chain, 'chemisorbed_chain[$]')
mb.force_overlap(new_chain, new_chain[chain_port_name],
binding_site)
added_chains += 1
if verbose:
print('Added chemisorbed chain {}'
''.format(len(self['chemisorbed_chain'])))
def test_spin_z_eq(self, sixpoints):
compound2 = mb.clone(sixpoints)
sixpoints.spin(np.pi * 1.23456789, np.asarray([0.0, 0.0, 1.0]))
spin_z(compound2, np.pi * 1.23456789)
assert (np.allclose(compound2.xyz, sixpoints.xyz, atol=1e-16))
def _add_crosslinked_chains(self, chain, spacing, n_chains,
chain_port_name, verbose):
"""Add crosslinked chains... """
# Add hydroxyl to prototype for crosslinked chain
chain.spin(np.pi / 2, [1, 0, 0])
hydroxyl = Hydroxyl()
mb.force_overlap(hydroxyl, hydroxyl['down'], chain[chain_port_name])
chain.add(hydroxyl)
surface_level = max(self['surface'].xyz[:, 2])
chains_in_monolayer = len(self['chemisorbed_chain'])
complete = False
while not complete:
vertices = self._get_voronoi_vertices()
# Determine locations of chains already in the monolayer
chemisorbed_chain_locations = np.array(
[chain.pos for chain in self['chemisorbed_chain']])
if 'crosslinked_chain' in self.labels:
crosslinked_chain_locations = np.array(
[chain.pos for chain in self['crosslinked_chain']])
try:
chain_locations = np.vstack(
(chemisorbed_chain_locations, crosslinked_chain_locations))
except UnboundLocalError:
chain_locations = chemisorbed_chain_locations
chain_locations[:, 2] = 0
dists = []
for vertex in vertices:
min_dist = np.min([
self.min_periodic_distance([vertex[0], vertex[1], 0.0],
loc) for loc in chain_locations
])
dists.append(min_dist)
'''
Add crosslinked chain to monolayer if:
1. n_chains is specified and chains_in_monolayer < n_chains
2. n_chains is not specified and np.max(dists) > spacing
'''
if ((n_chains and chains_in_monolayer < n_chains)
or (not n_chains and np.max(dists) > spacing)):
site_2d = vertices[np.argmax(dists)]
site = np.array([site_2d[0], site_2d[1], 0.0])
failed_attempts = 0
new_chain = mb.clone(chain)
new_chain.translate_to(site)
new_chain.translate([
0.0, 0.0, surface_level +
(new_chain.pos[2] - min(new_chain.xyz[:, 2])) + 0.15
])
self.add(new_chain, 'crosslinked_chain[$]')
new_chain_si = list(new_chain.particles_by_name('Si'))[0]
self.crosslink_graph.add_node(new_chain_si,
pos=(site[0], site[1]),
surface_bound=False)
chains_in_monolayer = len(self['crosslinked_chain']) + \
len(self['chemisorbed_chain'])
if np.max(dists) <= spacing:
print(
'Added chain would be closer to a neighboring chain than '
'the specified `spacing` ({}). Chain will be added to '
'meet `n_chains` requirement.'.format(spacing))
if verbose:
print('Added crosslinked chain {} ({} total chains)'
''.format(len(self['crosslinked_chain']),
chains_in_monolayer))
else:
complete = True
def solvate(solute, solvent, n_solvent, box, overlap=0.2,
seed=12345, edge=0.2, fix_orientation=False, temp_file=None):
"""Solvate a compound in a box of solvent using packmol.
Parameters
----------
solute : mb.Compound
Compound to be placed in a box and solvated.
solvent : mb.Compound
Compound to solvate the box.
n_solvent : int
Number of solvents to be put in box.
box : mb.Box
Box to be filled by compounds.
overlap : float, units nm, default=0.2
Minimum separation between atoms of different molecules.
seed : int, default=12345
Random seed to be passed to PACKMOL.
edge : float, units nm, default=0.2
Buffer at the edge of the box to not place molecules. This is necessary
in some systems because PACKMOL does not account for periodic boundary
conditions in its optimization.
fix_orientation : bool
Specify if solvent should not be rotated when filling box,
default=False.
temp_file : str, default=None
File name to write PACKMOL's raw output to.
Returns
-------
solvated : mb.Compound
"""
_check_packmol(PACKMOL)
box = _validate_box(box)
if not isinstance(solvent, (list, set)):
solvent = [solvent]
if not isinstance(n_solvent, (list, set)):
n_solvent = [n_solvent]
if not isinstance(fix_orientation, (list, set)):
fix_orientation = [fix_orientation] * len(solvent)
if len(solvent) != len(n_solvent):
msg = ("`n_solvent` and `n_solvent` must be of equal length.")
raise ValueError(msg)
# In angstroms for packmol.
box_mins = box.mins * 10
box_maxs = box.maxs * 10
overlap *= 10
center_solute = (box_maxs + box_mins) / 2
# Apply edge buffer
box_maxs -= edge * 10
# Build the input file for each compound and call packmol.
solvated_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solute_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solute.save(solute_pdb, overwrite=True)
input_text = (PACKMOL_HEADER.format(overlap, solvated_pdb, seed) +
PACKMOL_SOLUTE.format(solute_pdb, *center_solute))
for solv, m_solvent, rotate in zip(solvent, n_solvent, fix_orientation):
m_solvent = int(m_solvent)
solvent_pdb = tempfile.mkstemp(suffix='.pdb')[1]
solv.save(solvent_pdb, overwrite=True)
input_text += PACKMOL_BOX.format(solvent_pdb, m_solvent,
box_mins[0], box_mins[1], box_mins[2],
box_maxs[0], box_maxs[1], box_maxs[2],
PACKMOL_CONSTRAIN if rotate else "")
_run_packmol(input_text, solvated_pdb, temp_file)
# Create the topology and update the coordinates.
solvated = Compound()
solvated.add(solute)
for solv, m_solvent in zip(solvent, n_solvent):
for _ in range(m_solvent):
solvated.add(clone(solv))
solvated.update_coordinates(solvated_pdb)
return solvated
def test_equivalence_transform_deprectation_warning(self, ch2):
ch22 = mb.clone(ch2)
with pytest.warns(DeprecationWarning):
mb.equivalence_transform(ch22,
from_positions=ch22['up'],
to_positions=ch2['down'])
def test_add_existing_parent(self, ethane, h2o):
water_in_water = mb.clone(h2o)
h2o.add(water_in_water)
with pytest.raises(MBuildError):
ethane.add(water_in_water)
def test_different_translates(self, methane):
shifted = mb.clone(methane)
shifted.translate([5, 4, 3])
shifted_methane_coords = mb.coordinate_transform._translate(
methane.xyz, [5, 4, 3])
assert np.array_equal(shifted_methane_coords, shifted.xyz)
def test_clone_outside_containment(self, ch2, ch3):
compound = mb.Compound()
compound.add(ch2)
mb.force_overlap(ch3, ch3['up'], ch2['up'])
with pytest.raises(MBuildError):
ch3_clone = mb.clone(ch3)
def test_different_translate_tos_origin(self, methane):
shifted = mb.clone(methane)
shifted.translate_to([0, 0, 0])
x = mb.coordinate_transform._translate_to(methane.xyz, [0, 0, 0])
assert np.array_equal(shifted.xyz, x)