def pack(self, params, with_indices=False):
'''
Packs the parameters object from a 1D array. NOTE! This is done in
primarily for parameterization; which means the 1D array will NOT have
the indices in it. This can be overridden, however, by specifying the
with_indices flag.
Keep in mind, to maintain symmetry requirements in tersoff (where
the two-body parameters are the same between A-B B and B-A A), this
function will be tied closely to the unpack function.
**Parameters**
params: *list, float/int*
A list of parameters
with_indices: *bool, optional*
Whether to account for the indices in the flat array.
**Returns**
None
'''
param_types, _ = self._get_param_list(trim_tersoff_2body=True)
offset = 0
for param_type in param_types:
for p in param_type:
if ffh.check_restriction(p, self.restrict):
p.pack(params[offset:offset + p.N_params +
int(with_indices)])
offset += p.N_params + int(with_indices)
#self.tersoff_params = sorted_force_2body_symmetry(self.tersoff_params)
sorted_force_2body_symmetry(self.tersoff_params)
def dump_dihedrals(self):
'''
Get a string for lammps input in regards to assigning dihedral coeffs.
**Returns**
coeffs: *str*
A string of dihedral coeffs, with new line characters between
different dihedrals.
'''
lammps_command = []
if self.opls_structure_dict is None:
restrict_structures = None
else:
restrict_structures = [
v for k, v in self.opls_structure_dict.items()
if k in self.restrict
]
# Loop through all possible dihedral parameters
index = 1
for dihedral in self.dihedral_params:
# Skip those that are not included
if not ffh.check_restriction(dihedral, restrict_structures):
continue
# Get the dihedral coeff string
lammps_command.append(
"dihedral_coeff %d %s" %
(index, dihedral.printer(map_indices=self.mapper)))
index += 1
return "\n".join(lammps_command)
def write_smrff(self, fname):
'''
A function to save a SMRFF parameter file.
**Parameters**
fname: *str*
The file name to save the parameters to.
**Returns**
None
'''
params = ""
param_types, param_string_identifiers = self._get_param_list()
for param_type, param_string in zip(param_types,
param_string_identifiers):
if param_type is not None:
params = params.strip() + "\n" + param_string + "\n"
params += "\n".join([
str(p) for p in param_type
if ffh.check_restriction(p, self.restrict)
])
params += "\nEND"
params = params.strip()
fptr = open(fname, 'w')
fptr.write(params)
fptr.close()
def dump_set_charge(self):
'''
This function will get the lammps command line argument for
"set type" of everything within the Parameters object.
**Parameters**
None
**Returns**
cmds: *str*
A string, separated with new lines, with pair_coeff for each
morse command possible within this parameter set.
'''
lammps_command = []
for i in range(len(self.coul_params)):
if not ffh.check_restriction(self.coul_params[i], self.restrict):
continue
charge_i = self.coul_params[i].charge
index = self.restrict.index(self.coul_params[i].index)
lammps_command.append('set type %d charge %f' %
(index + 1, charge_i))
lammps_command = "\n".join(lammps_command)
return lammps_command
def __repr__(self):
'''
This prints out a representation of the parameter object, in the format
that is output to the smrff parameter file.
**Returns**
params: *str*
A string representation of parameters.
'''
params = ""
param_list = self._get_param_list()
if self.opls_structure_dict is None:
restrict_structures = None
else:
restrict_structures = [
v for k, v in self.opls_structure_dict.items()
if k in self.restrict
]
# Handle smrff list
if param_list is not None:
for param_type, param_string in zip(*param_list):
if param_type is not None:
params = params.strip() + "\n" + param_string + "\n"
if param_string in OPLS_STRUCTURES:
params += "\n".join([
str(p) for p in param_type
if ffh.check_restriction(p, restrict_structures)
])
else:
params += "\n".join([
str(p) for p in param_type
if ffh.check_restriction(p, self.restrict)
])
params += "\nEND"
return params.strip()
def dump_lj_cut_coul_cut(self):
'''
This function will get the lammps command line argument for
lj/cut/coul/cut of everything within the Parameters object.
**Parameters**
None
**Returns**
cmds: *str*
A string, separated with new lines, with pair_coeff for each
lj/cut/coul/cut command possible within this parameter set.
'''
lammps_command = []
for i in range(len(self.lj_params)):
for j in range(i, len(self.lj_params)):
if not ffh.check_restriction(self.lj_params[i], self.restrict):
continue
if not ffh.check_restriction(self.lj_params[j], self.restrict):
continue
sigma_ij = (self.lj_params[i].sigma *
self.lj_params[j].sigma)**0.5
epsilon_ij = (self.lj_params[i].epsilon *
self.lj_params[j].epsilon)**0.5
type_i = int(self.restrict.index(self.lj_params[i].index) + 1)
type_j = int(self.restrict.index(self.lj_params[j].index) + 1)
type_i, type_j = sorted([type_i, type_j])
lammps_command.append(
'pair_coeff %d %d lj/cut/coul/cut %f %f' %
(type_i, type_j, epsilon_ij, sigma_ij))
lammps_command = "\n".join(lammps_command)
return lammps_command
def unpack(self, with_indices=False, with_bounds=False):
'''
Unpacks the parameters object into a 1D array for parameterization.
This means that the indices are not included during unpacking! Note,
this can be overridden though if needed.
**Parameters**
with_indices: *bool, optional*
Whether to also include the indices in the flat array.
with_bounds: *bool, optional*
Whether to also output the bounds for the parameters.
**Returns**
flat_array: *list, float/int*
A list of floats/ints of our parameters.
bounds_lower: *list, float/int*
If with_bounds is specified, then the lower bounds are returned.
bounds_upper: *list, float/int*
If with_bounds is specified, then the upper bounds are returned.
'''
verify_tersoff_2body_symmetry(self.tersoff_params)
param_types, param_string_identifiers = self._get_param_list(
trim_tersoff_2body=True)
out, bounds_lower, bounds_upper = [], [], []
for param_type in param_types:
for p in param_type:
if not ffh.check_restriction(p, self.restrict):
continue
if with_bounds:
local_out, local_bounds_l, local_bounds_u = p.unpack(
with_indices, with_bounds=with_bounds)
out += local_out
bounds_lower += local_bounds_l
bounds_upper += local_bounds_u
else:
out += p.unpack(with_indices)
if with_bounds:
return out, bounds_lower, bounds_upper
else:
return out
def dump_morse(self):
'''
This function will get the lammps command line argument for
morse of everything within the Parameters object.
**Parameters**
None
**Returns**
cmds: *str*
A string, separated with new lines, with pair_coeff for each
morse command possible within this parameter set.
'''
lammps_command = []
for k in range(len(self.morse_params)):
if not ffh.check_restriction(self.morse_params[k], self.restrict):
continue
index_i = self.restrict.index(str(
self.morse_params[k].indices[0])) + 1
index_j = self.restrict.index(str(
self.morse_params[k].indices[1])) + 1
index_i, index_j = sorted([index_i, index_j])
D0 = self.morse_params[k].D0
alpha = self.morse_params[k].alpha
r0 = self.morse_params[k].r0
rc = self.morse_params[k].rc
lammps_command.append('pair_coeff ' + str(index_i) + ' ' +
str(index_j) + ' morse %f %f %f %f' %
(D0, alpha, r0, rc))
lammps_command = "\n".join(lammps_command)
return lammps_command
