def main(prefix, suffix="pos", unitconv="1.0"):
ipos = []
imode = []
for filename in sorted(glob.glob(prefix + "." + suffix + "*")):
imode.append(filename.split(".")[-1])
ipos.append(open(filename, "r"))
nbeads = len(ipos)
natoms = 0
ifr = 0
while True:
try:
for i in range(nbeads):
ret = read_file(imode[i], ipos[i])
pos = ret["atoms"]
cell = ret["cell"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
cell.h *= float(unitconv)
beads[i].q = pos.q * float(unitconv)
beads.names = pos.names
except EOFError: # finished reading files
sys.exit(0)
print_file_path("pdb", beads, cell)
ifr += 1
def main(prefix, suffix="pos", unitconv="1.0"):
ipos = []
imode = []
for filename in sorted(glob.glob(prefix + "." + suffix + "*")):
imode.append(filename.split(".")[-1])
ipos.append(open(filename, "r"))
nbeads = len(ipos)
natoms = 0
ifr = 0
while True:
try:
for i in range(nbeads):
ret = read_file(imode[i], ipos[i])
pos = ret["atoms"]
cell = ret["cell"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
cell.h *= float(unitconv)
beads[i].q = pos.q * float(unitconv)
beads.names = pos.names
except EOFError: # finished reading files
sys.exit(0)
print_file_path("pdb", beads, cell)
ifr += 1
def main(prefix, temp):
temp = unit_to_internal("energy","kelvin",float(temp))
ipos=[]
for filename in sorted(glob.glob(prefix+".pos*")):
ipos.append(open(filename,"r"))
ifor=[]
for filename in sorted(glob.glob(prefix+".for*")):
ifor.append(open(filename,"r"))
ikin=open(prefix+".kin.xyz","w")
ikod=open(prefix+".kod.xyz","w")
nbeads = len(ipos)
if (nbeads!=len(ifor)): raise ValueError("Mismatch between number of output files for forces and positions")
natoms = 0
ifr = 0
while True:
try:
for i in range(nbeads):
pos = read_xyz(ipos[i])
force = read_xyz(ifor[i])
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms,nbeads)
forces = Beads(natoms,nbeads)
kcv = np.zeros((natoms,6),float)
beads[i].q = pos.q
forces[i].q = force.q
except EOFError: # finished reading files
sys.exit(0)
q = depstrip(beads.q)
f = depstrip(forces.q)
qc = depstrip(beads.qc)
kcv[:]=0
for j in range(nbeads):
for i in range(natoms):
kcv[i,0] += (q[j,i*3+0]-qc[i*3+0])*f[j,i*3+0]
kcv[i,1] += (q[j,i*3+1]-qc[i*3+1])*f[j,i*3+1]
kcv[i,2] += (q[j,i*3+2]-qc[i*3+2])*f[j,i*3+2]
kcv[i,3] += (q[j,i*3+0]-qc[i*3+0])*f[j,i*3+1] + (q[j,i*3+1]-qc[i*3+1])*f[j,i*3+0]
kcv[i,4] += (q[j,i*3+0]-qc[i*3+0])*f[j,i*3+2] + (q[j,i*3+2]-qc[i*3+2])*f[j,i*3+0]
kcv[i,5] += (q[j,i*3+1]-qc[i*3+1])*f[j,i*3+2] + (q[j,i*3+2]-qc[i*3+2])*f[j,i*3+1]
kcv*=-0.5/nbeads
kcv[:,0:3]+=0.5*Constants.kb*temp
kcv[:,3:6]*=0.5
ikin.write("%d\n# Centroid-virial kinetic energy estimator [a.u.] - diagonal terms: xx yy zz\n" % (natoms))
ikod.write("%d\n# Centroid-virial kinetic energy estimator [a.u.] - off-diag terms: xy xz yz\n" % (natoms))
for i in range(natoms):
ikin.write("%8s %12.5e %12.5e %12.5e\n" % (pos.names[i], kcv[i,0], kcv[i,1], kcv[i,2]))
ikod.write("%8s %12.5e %12.5e %12.5e\n" % (pos.names[i], kcv[i,3], kcv[i,4], kcv[i,5]))
ifr+=1
def init_beads(iif, nbeads):
"""A file to initialize a beads object from an appropriate initializer
object.
Args:
iif: An Initializer object which has information on the bead positions.
nbeads: The number of beads.
Raises:
ValueError: If called using an Initializer object with a 'manual' mode.
"""
mode = iif.mode
value = iif.value
if mode == "xyz" or mode == "pdb":
if mode == "xyz": ratoms = init_xyz(value)
if mode == "pdb": ratoms = init_pdb(value)[0]
rbeads = Beads(ratoms[0].natoms, len(ratoms))
for i in range(len(ratoms)):
rbeads[i] = ratoms[i]
elif mode == "chk":
rbeads = init_chk(value)[0]
elif mode == "manual":
raise ValueError("Cannot initialize manually a whole beads object.")
return rbeads
def init_beads(iif,
nbeads,
dimension="length",
units="automatic",
cell_units="automatic"):
"""Initializes a beads object from an appropriate initializer object.
Args:
iif: An Initializer object which has information on the bead positions.
nbeads: The number of beads.
Raises:
ValueError: If called using an Initializer object with a 'manual' mode.
"""
mode = iif.mode
value = iif.value
if mode == "chk":
rbeads = init_chk(value)[0]
elif mode == "manual":
raise ValueError("Cannot initialize manually a whole beads object.")
else:
ret = init_file(mode, value, dimension, units, cell_units)
ratoms = ret[0]
rbeads = Beads(ratoms[0].natoms, len(ratoms))
for i in range(len(ratoms)):
rbeads[i] = ratoms[i]
return rbeads
def bind(self, dumop, discretization):
self.temp = dumop.temp
self.fix = Fix(dumop.beads.natoms, dumop.fixatoms, dumop.beads.nbeads)
self.dbeads = Beads(dumop.beads.natoms - len(dumop.fixatoms), dumop.beads.nbeads)
self.dbeads.q[:] = self.fix.get_active_vector(dumop.beads.copy().q, 1)
self.dbeads.m[:] = self.fix.get_active_vector(dumop.beads.copy().m, 0)
self.dbeads.names[:] = self.fix.get_active_vector(dumop.beads.copy().names, 0)
self.set_coef(discretization)
if dumop.options["mode"] == 'rate':
self.omega2 = (self.temp * (2 * self.dbeads.nbeads) * units.Constants.kb / units.Constants.hbar) ** 2
elif dumop.options["mode"] == 'splitting':
self.omega2 = (self.temp * self.dbeads.nbeads * units.Constants.kb / units.Constants.hbar) ** 2
if dumop.options["opt"] == 'nichols' or dumop.options["opt"] == 'NR' or dumop.options["opt"] == 'lanczos':
self.h = self.spring_hessian(natoms=self.dbeads.natoms, nbeads=self.dbeads.nbeads, m3=self.dbeads.m3[0], omega2=self.omega2, coef=self.coef)
def init_stage1(self, simul):
"""Initializes the simulation -- first stage.
Takes a simulation object, and uses all the data in the initialization
queue to fill up the beads and cell data needed to run the simulation.
Args:
simul: A simulation object to be initialized.
Raises:
ValueError: Raised if there is a problem with the initialization,
if something that should have been has not been, or if the objects
that have been specified are not compatible with each other.
"""
if simul.beads.nbeads == 0:
fpos = fmom = fmass = flab = fcell = False # we don't have an explicitly defined beads object yet
else:
fpos = fmom = fmass = flab = fcell = True
for (k, v) in self.queue:
info(" # Initializer (stage 1) parsing " + str(k) + " object.",
verbosity.high)
if k == "cell":
if fcell:
warning("Overwriting previous cell parameters",
verbosity.medium)
if v.mode == "pdb":
rh = init_pdb(v.value)[1].h
elif v.mode == "chk":
rh = init_chk(v.value)[1].h
else:
rh = v.value.reshape((3, 3))
rh *= unit_to_internal("length", v.units, 1.0)
simul.cell.h = rh
if simul.cell.V == 0.0:
ValueError("Cell provided has zero volume")
fcell = True
elif k == "masses":
if simul.beads.nbeads == 0:
raise ValueError(
"Cannot initialize the masses before the size of the system is known"
)
if fmass:
warning("Overwriting previous atomic masses",
verbosity.medium)
if v.mode == "manual":
rm = v.value
else:
rm = init_beads(v, self.nbeads).m
rm *= unit_to_internal("mass", v.units, 1.0)
if v.bead < 0: # we are initializing the path
if (fmom and fmass):
warning(
"Rescaling momenta to make up for changed mass",
verbosity.medium)
simul.beads.p /= simul.beads.sm3 # go to mass-scaled momenta, that are mass-invariant
if v.index < 0:
simul.beads.m = rm
else: # we are initializing a specific atom
simul.beads.m[v.index:v.index + 1] = rm
if (fmom and fmass): # finishes correcting the momenta
simul.beads.p *= simul.beads.sm3 # back to normal momenta
else:
raise ValueError("Cannot change the mass of a single bead")
fmass = True
elif k == "labels":
if simul.beads.nbeads == 0:
raise ValueError(
"Cannot initialize the labels before the size of the system is known"
)
if flab:
warning("Overwriting previous atomic labels",
verbosity.medium)
if v.mode == "manual":
rn = v.value
else:
rn = init_beads(v, self.nbeads).names
if v.bead < 0: # we are initializing the path
if v.index < 0:
simul.beads.names = rn
else: # we are initializing a specific atom
simul.beads.names[v.index:v.index + 1] = rn
else:
raise ValueError(
"Cannot change the label of a single bead")
flab = True
elif k == "positions":
if fpos:
warning("Overwriting previous atomic positions",
verbosity.medium)
# read the atomic positions as a vector
rq = init_vector(v, self.nbeads)
rq *= unit_to_internal("length", v.units, 1.0)
(nbeads, natoms) = rq.shape
natoms /= 3
# check if we must initialize the simulation beads
if simul.beads.nbeads == 0:
if v.index >= 0:
raise ValueError(
"Cannot initialize single atoms before the size of the system is known"
)
simul.beads.resize(natoms, self.nbeads)
set_vector(v, simul.beads.q, rq)
fpos = True
elif (
k == "velocities" or k == "momenta"
) and v.mode == "thermal": # intercept here thermal initialization, so we don't need to check further down
if fmom:
warning("Overwriting previous atomic momenta",
verbosity.medium)
if simul.beads.natoms == 0:
raise ValueError(
"Cannot initialize momenta before the size of the system is known."
)
if not fmass:
raise ValueError(
"Trying to resample velocities before having masses.")
rtemp = v.value * unit_to_internal("temperature", v.units, 1.0)
if rtemp <= 0:
warning(
"Using the simulation temperature to resample velocities",
verbosity.low)
rtemp = simul.ensemble.temp
else:
info(
" # Resampling velocities at temperature %s %s" %
(v.value, v.units), verbosity.low)
# pull together a mock initialization to get NM masses right
#without too much code duplication
if v.bead >= 0:
raise ValueError("Cannot thermalize a single bead")
if v.index >= 0:
rnatoms = 1
else:
rnatoms = simul.beads.natoms
rbeads = Beads(rnatoms, simul.beads.nbeads)
if v.index < 0:
rbeads.m[:] = simul.beads.m
else:
rbeads.m[:] = simul.beads.m[v.index]
rnm = NormalModes(mode=simul.nm.mode,
transform_method=simul.nm.transform_method,
freqs=simul.nm.nm_freqs)
rens = Ensemble(dt=simul.ensemble.dt, temp=simul.ensemble.temp)
rnm.bind(rbeads, rens)
# then we exploit the sync magic to do a complicated initialization
# in the NM representation
# with (possibly) shifted-frequencies NM
rnm.pnm = simul.prng.gvec(
(rbeads.nbeads, 3 * rbeads.natoms)) * np.sqrt(
rnm.dynm3) * np.sqrt(
rbeads.nbeads * rtemp * Constants.kb)
if v.index < 0:
simul.beads.p = rbeads.p
else:
simul.beads.p[:, 3 * v.index:3 * (v.index + 1)] = rbeads.p
fmom = True
elif k == "momenta":
if fmom:
warning("Overwriting previous atomic momenta",
verbosity.medium)
# read the atomic momenta as a vector
rp = init_vector(v, self.nbeads, momenta=True)
rp *= unit_to_internal("momentum", v.units, 1.0)
(nbeads, natoms) = rp.shape
natoms /= 3
# checks if we must initialize the simulation beads
if simul.beads.nbeads == 0:
if v.index >= 0:
raise ValueError(
"Cannot initialize single atoms before the size of the system is known"
)
simul.beads.resize(natoms, self.nbeads)
rp *= np.sqrt(self.nbeads / nbeads)
set_vector(v, simul.beads.p, rp)
fmom = True
elif k == "velocities":
if fmom:
warning("Overwriting previous atomic momenta",
verbosity.medium)
# read the atomic velocities as a vector
rv = init_vector(v, self.nbeads)
rv *= unit_to_internal("velocity", v.units, 1.0)
(nbeads, natoms) = rv.shape
natoms /= 3
# checks if we must initialize the simulation beads
if simul.beads.nbeads == 0 or not fmass:
ValueError(
"Cannot initialize velocities before the masses of the atoms are known"
)
simul.beads.resize(natoms, self.nbeads)
warning(
"Initializing from velocities uses the previously defined masses -- not the masses inferred from the file -- to build momenta",
verbosity.low)
if v.index >= 0:
rv *= simul.beads.m[v.index]
elif v.bead >= 0:
rv *= simul.beads.m3[0]
else:
rv *= simul.beads.m3
rv *= np.sqrt(self.nbeads / nbeads)
set_vector(v, simul.beads.p, rv)
fmom = True
elif k == "thermostat":
pass # thermostats must be initialized in a second stage
if simul.beads.natoms == 0:
raise ValueError(
"Initializer could not initialize the atomic positions")
if simul.cell.V == 0:
raise ValueError("Initializer could not initialize the cell")
for i in range(simul.beads.natoms):
if simul.beads.m[i] <= 0:
raise ValueError("Initializer could not initialize the masses")
if simul.beads.names[i] == "":
raise ValueError(
"Initializer could not initialize the atom labels")
if not fmom:
warning(
"Momenta not specified in initialize. Will start with zero velocity if they are not specified in beads.",
verbosity.low)
def init_stage1(self, simul):
"""Initializes the simulation -- first stage.
Takes a simulation object, and uses all the data in the initialization
queue to fill up the beads and cell data needed to run the simulation.
Args:
simul: A simulation object to be initialized.
Raises:
ValueError: Raised if there is a problem with the initialization,
if something that should have been has not been, or if the objects
that have been specified are not compatible with each other.
"""
if simul.beads.nbeads == 0:
fpos = fmom = fmass = flab = fcell = False # we don't have an explicitly defined beads object yet
else:
fpos = fmom = fmass = flab = fcell = True
for (k, v) in self.queue:
info(" # Initializer (stage 1) parsing " + str(k) + " object.", verbosity.high)
if k == "cell":
if v.mode == "manual":
rh = v.value.reshape((3, 3)) * unit_to_internal("length", v.units, 1.0)
elif v.mode == "chk":
rh = init_chk(v.value)[1].h
elif init_file(v.mode, v.value)[1].h.trace() == -3:
# In case the file do not contain any
# + cell parameters, the diagonal elements of the cell will be
# +set to -1 from the io_units and nothing is read here.
continue
else:
rh = init_file(v.mode, v.value, cell_units=v.units)[1].h
if fcell:
warning("Overwriting previous cell parameters", verbosity.low)
simul.cell.h = rh
if simul.cell.V == 0.0:
ValueError("Cell provided has zero volume")
fcell = True
elif k == "masses":
if simul.beads.nbeads == 0:
raise ValueError("Cannot initialize the masses before the size of the system is known")
if fmass:
warning("Overwriting previous atomic masses", verbosity.medium)
if v.mode == "manual":
rm = v.value * unit_to_internal("mass", v.units, 1.0)
else:
rm = init_beads(v, self.nbeads).m
if v.bead < 0: # we are initializing the path
if (fmom and fmass):
warning("Rescaling momenta to make up for changed mass", verbosity.medium)
simul.beads.p /= simul.beads.sm3 # go to mass-scaled momenta, that are mass-invariant
if v.index < 0:
simul.beads.m = rm
else: # we are initializing a specific atom
simul.beads.m[v.index:v.index + 1] = rm
if (fmom and fmass): # finishes correcting the momenta
simul.beads.p *= simul.beads.sm3 # back to normal momenta
else:
raise ValueError("Cannot change the mass of a single bead")
fmass = True
elif k == "labels":
if simul.beads.nbeads == 0:
raise ValueError("Cannot initialize the labels before the size of the system is known")
if flab:
warning("Overwriting previous atomic labels", verbosity.medium)
if v.mode == "manual":
rn = v.value
else:
rn = init_beads(v, self.nbeads).names
if v.bead < 0: # we are initializing the path
if v.index < 0:
simul.beads.names = rn
else: # we are initializing a specific atom
simul.beads.names[v.index:v.index + 1] = rn
else:
raise ValueError("Cannot change the label of a single bead")
flab = True
elif k == "positions":
if fpos:
warning("Overwriting previous atomic positions", verbosity.medium)
# read the atomic positions as a vector
rq = init_vector(v, self.nbeads, dimension="length", units=v.units)
nbeads, natoms = rq.shape
natoms /= 3
# check if we must initialize the simulation beads
if simul.beads.nbeads == 0:
if v.index >= 0:
raise ValueError("Cannot initialize single atoms before the size of the system is known")
simul.beads.resize(natoms, self.nbeads)
set_vector(v, simul.beads.q, rq)
fpos = True
elif (k == "velocities" or k == "momenta") and v.mode == "thermal": # intercept here thermal initialization, so we don't need to check further down
if fmom:
warning("Overwriting previous atomic momenta", verbosity.medium)
if simul.beads.natoms == 0:
raise ValueError("Cannot initialize momenta before the size of the system is known.")
if not fmass:
raise ValueError("Trying to resample velocities before having masses.")
rtemp = v.value * unit_to_internal("temperature", v.units, 1.0)
if rtemp <= 0:
warning("Using the simulation temperature to resample velocities", verbosity.low)
rtemp = simul.ensemble.temp
else:
info(" # Resampling velocities at temperature %s %s" % (v.value, v.units), verbosity.low)
# pull together a mock initialization to get NM masses right
# without too much code duplication
if v.bead >= 0:
raise ValueError("Cannot thermalize a single bead")
if v.index >= 0:
rnatoms = 1
else:
rnatoms = simul.beads.natoms
rbeads = Beads(rnatoms, simul.beads.nbeads)
if v.index < 0:
rbeads.m[:] = simul.beads.m
else:
rbeads.m[:] = simul.beads.m[v.index]
rnm = NormalModes(mode=simul.nm.mode, transform_method=simul.nm.transform_method, freqs=simul.nm.nm_freqs)
rens = Ensemble(temp=simul.ensemble.temp)
rmv = Motion()
rnm.bind(rens, rmv, rbeads)
# then we exploit the sync magic to do a complicated initialization
# in the NM representation
# with (possibly) shifted-frequencies NM
rnm.pnm = simul.prng.gvec((rbeads.nbeads, 3 * rbeads.natoms)) * np.sqrt(rnm.dynm3) * np.sqrt(rbeads.nbeads * rtemp * Constants.kb)
if v.index < 0:
simul.beads.p = rbeads.p
else:
simul.beads.p[:, 3 * v.index:3 * (v.index + 1)] = rbeads.p
fmom = True
elif k == "momenta":
if fmom:
warning("Overwriting previous atomic momenta", verbosity.medium)
# read the atomic momenta as a vector
rp = init_vector(v, self.nbeads, momenta=True, dimension="momentum", units=v.units)
nbeads, natoms = rp.shape
natoms /= 3
# checks if we must initialize the simulation beads
if simul.beads.nbeads == 0:
if v.index >= 0:
raise ValueError("Cannot initialize single atoms before the size of the system is known")
simul.beads.resize(natoms, self.nbeads)
rp *= np.sqrt(self.nbeads / nbeads)
set_vector(v, simul.beads.p, rp)
fmom = True
elif k == "velocities":
if fmom:
warning("Overwriting previous atomic momenta", verbosity.medium)
# read the atomic velocities as a vector
rv = init_vector(v, self.nbeads, dimension="velocity", units=v.units)
nbeads, natoms = rv.shape
natoms /= 3
# checks if we must initialize the simulation beads
if simul.beads.nbeads == 0 or not fmass:
ValueError("Cannot initialize velocities before the masses of the atoms are known")
simul.beads.resize(natoms, self.nbeads)
warning("Initializing from velocities uses the previously defined masses -- not the masses inferred from the file -- to build momenta", verbosity.low)
if v.index >= 0:
rv *= simul.beads.m[v.index]
else:
for ev in rv:
ev *= simul.beads.m3[0]
rv *= np.sqrt(self.nbeads / nbeads)
set_vector(v, simul.beads.p, rv)
fmom = True
elif k == "gle": pass # thermostats must be initialised in a second stage
if simul.beads.natoms == 0:
raise ValueError("Initializer could not initialize the atomic positions")
if simul.cell.V == 0:
raise ValueError("Initializer could not initialize the cell")
for i in range(simul.beads.natoms):
if simul.beads.m[i] <= 0:
raise ValueError("Initializer could not initialize the masses")
if simul.beads.names[i] == "":
raise ValueError("Initializer could not initialize the atom labels")
if not fmom:
warning("Momenta not specified in initialize. Will start with zero velocity if they are not specified in beads.", verbosity.low)
def bind(self, beads, cell, fcomponents, fflist):
"""Binds beads, cell and forces to the forcefield.
Args:
beads: Beads object from which the bead positions are taken.
cell: Cell object from which the system box is taken.
fcomponents: A list of different objects for each force type.
For example, if ring polymer contraction is being used,
then there may be separate forces for the long and short
range part of the potential.
fflist: A list of forcefield objects to use to calculate the potential,
forces and virial for each force type. To clarify: fcomponents are the
names and parameters of forcefields that are active for a certain
system. fflist contains the overall list of force providers,
and one typically has just one per force kind.
"""
self.natoms = beads.natoms
self.nbeads = beads.nbeads
self.beads = beads
self.cell = cell
self.bound = True
self.nforces = len(fcomponents)
self.fcomp = fcomponents
self.ff = fflist
# fflist should be a dictionary of forcefield objects
self.mforces = []
self.mbeads = []
self.mrpc = []
dself = dd(self)
# a "function factory" to generate functions to automatically update
# contracted paths
def make_rpc(rpc, beads):
return lambda: rpc.b1tob2(dstrip(beads.q))
# creates new force objects, possibly acting on contracted path
# representations
for fc in self.fcomp:
# creates an automatically-updated contracted beads object
newb = fc.nbeads
# if the number of beads for this force component is unspecified,
# assume full force evaluation
if newb == 0 or newb > beads.nbeads: newb = beads.nbeads
newforce = ForceComponent(ffield=fc.ffield, name=fc.name, nbeads=newb, weight=fc.weight, mts_weights=fc.mts_weights, epsilon=fc.epsilon)
newbeads = Beads(beads.natoms, newb)
newrpc = nm_rescale(beads.nbeads, newb)
# the beads positions for this force components are obtained
# automatically, when needed, as a contraction of the full beads
dd(newbeads).q._func = make_rpc(newrpc, beads)
for b in newbeads:
# must update also indirect access to the beads coordinates
dd(b).q._func = dd(newbeads).q._func
# makes newbeads.q depend from beads.q
dd(beads).q.add_dependant(dd(newbeads).q)
# now we create a new forcecomponent which is bound to newbeads!
newforce.bind(newbeads, cell, fflist)
# adds information we will later need to the appropriate lists.
self.mbeads.append(newbeads)
self.mforces.append(newforce)
self.mrpc.append(newrpc)
# now must expose an interface that gives overall forces
dself.f = depend_array(name="f", value=np.zeros((self.nbeads, 3 * self.natoms)),
func=self.f_combine,
dependencies=[dd(ff).f for ff in self.mforces])
# collection of pots and virs from individual ff objects
dself.pots = depend_array(name="pots", value=np.zeros(self.nbeads, float),
func=self.pot_combine,
dependencies=[dd(ff).pots for ff in self.mforces])
# must take care of the virials!
dself.virs = depend_array(name="virs", value=np.zeros((self.nbeads, 3, 3), float),
func=self.vir_combine,
dependencies=[dd(ff).virs for ff in self.mforces])
dself.extras = depend_value(name="extras", value=np.zeros(self.nbeads, float),
func=self.extra_combine,
dependencies=[dd(ff).extras for ff in self.mforces])
# total potential and total virial
dself.pot = depend_value(name="pot", func=(lambda: self.pots.sum()),
dependencies=[dself.pots])
dself.vir = depend_array(name="vir", func=self.get_vir, value=np.zeros((3, 3)),
dependencies=[dself.virs])
# SC forces and potential
dself.alpha = depend_value(name="alpha", value=0.0)
# The number of MTS levels
dself.nmtslevels = depend_value(name="nmtslevels", value=0, func=self.get_nmtslevels)
# This will be piped from normalmodes
dself.omegan2 = depend_value(name="omegan2", value=0)
# The Suzuki-Chin difference potential
dself.potssc = depend_array(name="potssc", value=np.zeros(self.nbeads, float),
dependencies=[dd(self.beads).m, dself.f, dself.pots, dself.alpha,
dself.omegan2],
func=self.get_potssc)
dself.potsc = depend_value(name="potsc",
dependencies=[dself.potssc],
func=(lambda: self.potssc.sum()))
# The coefficients of the physical and the |f|^2 terms
dself.coeffsc_part_1 = depend_array(name="coeffsc_part_1", value=np.zeros((self.nbeads, 1), float),
func=self.get_coeffsc_part_1)
dself.coeffsc_part_2 = depend_array(name="coeffsc_part_2", value=np.zeros((self.nbeads, 1), float),
dependencies=[dself.alpha, dself.omegan2], func=self.get_coeffsc_part_2)
# A list that contains the high order component of the force and the virial
dself.fvir_4th_order = depend_value(name="fvir_4th_order", value=[None, None],
dependencies=[dd(self.beads).m, dself.f, dself.pots],
func=self.fvir_4th_order_combine)
# The high order component of the Suzuki-Chin force.
dself.f_4th_order = depend_array(name="f_4th_order", value=np.zeros((self.nbeads, 3 * self.natoms), float),
dependencies=[dself.fvir_4th_order],
func=(lambda: self.fvir_4th_order[0]))
dself.fsc_part_1 = depend_array(name="fsc_part_1", value=np.zeros((self.nbeads, 3 * self.natoms), float),
dependencies=[dself.coeffsc_part_1, dself.f],
func=self.get_fsc_part_1)
dself.fsc_part_2 = depend_array(name="fsc_part_2", value=np.zeros((self.nbeads, 3 * self.natoms), float),
dependencies=[dself.coeffsc_part_2, dself.f_4th_order],
func=self.get_fsc_part_2)
dself. fsc = depend_array(name="fsc", value=np.zeros((self.nbeads, 3 * self.natoms), float),
dependencies=[dself.fsc_part_1, dself.fsc_part_2],
func=self.get_fsc)
# The high order component of the Suzuki-Chin virial.
dself.virs_4th_order = depend_array(name="vir_4th_order", value=np.zeros((self.nbeads, 3, 3), float),
dependencies=[dself.fvir_4th_order],
func=(lambda: self.fvir_4th_order[1]))
dself.virssc_part_1 = depend_array(name="virssc_part_1", value=np.zeros((self.nbeads, 3, 3), float),
dependencies=[dself.coeffsc_part_1, dself.virs],
func=self.get_virssc_part_1)
dself.virssc_part_2 = depend_array(name="virssc_part_2", value=np.zeros((self.nbeads, 3, 3), float),
dependencies=[dself.coeffsc_part_2, dself.virs_4th_order],
func=self.get_virssc_part_2)
dself.virssc = depend_array(name="virssc", value=np.zeros((self.nbeads, 3, 3), float),
dependencies=[dself.virssc_part_1, dself.virssc_part_2],
func=self.get_virssc)
dself.virsc = depend_value(name="potsc",
dependencies=[dself.potssc],
func=(lambda: np.sum(self.virssc, axis=0)))
# Add dependencies from the force weights, that are applied here when the total
# force is assembled from its components
for fc in self.mforces:
dself.f.add_dependency(dd(fc).weight)
dself.pots.add_dependency(dd(fc).weight)
dself.virs.add_dependency(dd(fc).weight)
def main(prefix, temp):
temp = unit_to_internal("energy", "kelvin", float(temp))
ipos = []
for filename in sorted(glob.glob(prefix + ".pos*")):
ipos.append(open(filename, "r"))
ifor = []
for filename in sorted(glob.glob(prefix + ".for*")):
ifor.append(open(filename, "r"))
ivacfim = open(prefix + ".imvacf", "w")
nbeads = len(ipos)
if (nbeads != len(ifor)):
raise ValueError(
"Mismatch between number of output files for forces and positions")
natoms = 0
ifr = 0
while True:
try:
for i in range(nbeads):
ret = read_file("xyz", ipos[i])
pos = ret["atoms"]
ret = read_file("xyz", ifor[i])
force = ret["atoms"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
forces = Beads(natoms, nbeads)
beads[i].q = pos.q
beads[i].m = pos.m
forces[i].q = force.q
except EOFError: # finished reading files
break
if (ifr == 0):
cim = np.zeros((natoms, nbeads + 1), float)
q = dstrip(beads.q)
f = dstrip(forces.q)
m = dstrip(beads.m)
qc = dstrip(beads.qc)
for j in range(nbeads + 1):
for i in range(natoms):
dummy = [(q[(j + k) % nbeads, 3 * i:3 *
(i + 1)] - qc[3 * i:3 * (i + 1)]) *
(-f[k, 3 * i:3 * (i + 1)]) for k in range(nbeads)]
cim[i, j] = cim[i, j] + np.sum(dummy) / (nbeads * m[i])
cim[i, j] += 3. * Constants.kb * temp / m[i]
ifr += 1
print 'Frame: ', ifr
cim[:, :] = cim[:, :] / ifr
fullcim = np.zeros(len(cim))
for j in range(nbeads + 1):
fullcim[j] = np.sum([i for i in cim[:, j]])
ivacfim.write(
"# Imaginary time autocorrelation, averaged through the whole simulation -- beta*hbar is %f \n"
% (Constants.hbar / (Constants.kb * temp)))
for islice in range(nbeads + 1):
ivacfim.write("%f %12.5e \n" %
(float(islice) / float(nbeads), fullcim[islice]))
def main(prefix, temp):
T = float(temp)
fns_pos = sorted(glob.glob(prefix + ".pos*"))
fns_for = sorted(glob.glob(prefix + ".for*"))
fn_out_kin = prefix + ".kin.xyz"
fn_out_kod = prefix + ".kod.xyz"
# check that we found the same number of positions and forces files
nbeads = len(fns_pos)
if nbeads != len(fns_for):
print fns_pos
print fns_for
raise ValueError(
"Mismatch between number of input files for forces and positions.")
# print some information
print 'temperature = {:f} K'.format(T)
print
print 'number of beads = {:d}'.format(nbeads)
print
print 'positions and forces file names:'
for fn_pos, fn_for in zip(fns_pos, fns_for):
print '{:s} {:s}'.format(fn_pos, fn_for)
print
print 'output file names:'
print fn_out_kin
print fn_out_kod
print
temp = unit_to_internal("energy", "kelvin", T)
# open input and output files
ipos = [open(fn, "r") for fn in fns_pos]
ifor = [open(fn, "r") for fn in fns_for]
ikin = open(fn_out_kin, "w")
ikod = open(fn_out_kod, "w")
natoms = 0
ifr = 0
while True:
# print progress
if ifr % 100 == 0:
print '\rProcessing frame {:d}'.format(ifr),
sys.stdout.flush()
# load one frame
try:
for i in range(nbeads):
ret = read_file("xyz", ipos[i])
pos = ret["atoms"]
ret = read_file("xyz", ifor[i])
force = ret["atoms"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
forces = Beads(natoms, nbeads)
kcv = np.zeros((natoms, 6), float)
beads[i].q = pos.q
forces[i].q = force.q
except EOFError:
# finished reading files
break
# calculate kinetic energies
q = dstrip(beads.q)
f = dstrip(forces.q)
qc = dstrip(beads.qc)
kcv[:] = 0
for j in range(nbeads):
for i in range(natoms):
kcv[i,
0] += (q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 0]
kcv[i,
1] += (q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 1]
kcv[i,
2] += (q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 2]
kcv[i, 3] += (
q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 1] + (
q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 0]
kcv[i, 4] += (
q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 2] + (
q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 0]
kcv[i, 5] += (
q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 2] + (
q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 1]
kcv *= -0.5 / nbeads
kcv[:, 0:3] += 0.5 * Constants.kb * temp
kcv[:, 3:6] *= 0.5
# write output
ikin.write(
"%d\n# Centroid-virial kinetic energy estimator [a.u.] - diagonal terms: xx yy zz\n"
% natoms)
ikod.write(
"%d\n# Centroid-virial kinetic energy estimator [a.u.] - off-diag terms: xy xz yz\n"
% natoms)
for i in range(natoms):
ikin.write("%8s %12.5e %12.5e %12.5e\n" %
(pos.names[i], kcv[i, 0], kcv[i, 1], kcv[i, 2]))
ikod.write("%8s %12.5e %12.5e %12.5e\n" %
(pos.names[i], kcv[i, 3], kcv[i, 4], kcv[i, 5]))
ifr += 1
print '\rProcessed {:d} frames.'.format(ifr)
ikin.close()
ikod.close()
def bind(self, beads, cell, fcomponents, fflist):
"""Binds beads, cell and forces to the forcefield.
Args:
beads: Beads object from which the bead positions are taken.
cell: Cell object from which the system box is taken.
fcomponents: A list of different objects for each force type.
For example, if ring polymer contraction is being used,
then there may be separate forces for the long and short
range part of the potential.
fflist: A list of forcefield objects to use to calculate the potential,
forces and virial for each force type. To clarify: fcomponents are the
names and parameters of forcefields that are active for a certain
system. fflist contains the overall list of force providers,
and one typically has just one per force kind.
"""
self.natoms = beads.natoms
self.nbeads = beads.nbeads
self.beads = beads
self.cell = cell
self.bound = True
self.nforces = len(fcomponents)
self.fcomp = fcomponents
self.ff = fflist
# fflist should be a dictionary of forcefield objects
self.mforces = []
self.mbeads = []
self.mrpc = []
# a "function factory" to generate functions to automatically update
#contracted paths
def make_rpc(rpc, beads):
return lambda: rpc.b1tob2(depstrip(beads.q))
# creates new force objects, possibly acting on contracted path
#representations
for fc in self.fcomp:
# creates an automatically-updated contracted beads object
newb = fc.nbeads
# if the number of beads for this force component is unspecified,
# assume full force evaluation
if newb == 0: newb = beads.nbeads
newforce = ForceComponent(ffield=fc.ffield, name=fc.name, nbeads=newb, weight=fc.weight, mts_weights=fc.mts_weights)
newbeads = Beads(beads.natoms, newb)
newrpc = nm_rescale(beads.nbeads, newb)
# the beads positions for this force components are obtained
# automatically, when needed, as a contraction of the full beads
dget(newbeads,"q")._func = make_rpc(newrpc, beads)
for b in newbeads:
# must update also indirect access to the beads coordinates
dget(b,"q")._func = dget(newbeads,"q")._func
# makes newbeads.q depend from beads.q
dget(beads,"q").add_dependant(dget(newbeads,"q"))
#now we create a new forcecomponent which is bound to newbeads!
newforce.bind(newbeads, cell, fflist)
#adds information we will later need to the appropriate lists.
self.mbeads.append(newbeads)
self.mforces.append(newforce)
self.mrpc.append(newrpc)
#now must expose an interface that gives overall forces
dset(self,"f",
depend_array(name="f",value=np.zeros((self.nbeads,3*self.natoms)),
func=self.f_combine,
dependencies=[dget(ff, "f") for ff in self.mforces] ) )
# collection of pots and virs from individual ff objects
dset(self,"pots",
depend_array(name="pots", value=np.zeros(self.nbeads,float),
func=self.pot_combine,
dependencies=[dget(ff, "pots") for ff in self.mforces]) )
# must take care of the virials!
dset(self,"virs",
depend_array(name="virs", value=np.zeros((self.nbeads,3,3),float),
func=self.vir_combine,
dependencies=[dget(ff, "virs") for ff in self.mforces]) )
dset(self,"extras",
depend_value(name="extras", value=np.zeros(self.nbeads,float),
func=self.extra_combine,
dependencies=[dget(ff, "extras") for ff in self.mforces]))
# total potential and total virial
dset(self,"pot",
depend_value(name="pot", func=(lambda: self.pots.sum()),
dependencies=[dget(self,"pots")]))
dset(self,"vir",
depend_array(name="vir", func=self.get_vir, value=np.zeros((3,3)),
dependencies=[dget(self,"virs")]))
# SC forces and potential
dset(self, "alpha", depend_value(name="alpha", value=0.5))
# this will be piped from normalmodes
dset(self, "omegan2", depend_value(name="alpha", value=0))
dset(self, "SCCALC",
depend_value(name="SCCALC", func=self.sccalc, value = [None,None],
dependencies=[dget(self, "f"), dget(self,"pots"), dget(self,"alpha"), dget(self,"omegan2")] ) )
dset(self, "fsc", depend_array(name="fsc",value=np.zeros((self.nbeads,3*self.natoms)),
dependencies=[dget(self,"SCCALC")],
func=(lambda: self.SCCALC[1] ) ) )
dset(self, "potsc", depend_value(name="potsc",
dependencies=[dget(self,"SCCALC") ],
func=(lambda: self.SCCALC[0] ) ) )
def bind(self, beads, cell, flist):
self.natoms = beads.natoms
self.nbeads = beads.nbeads
self.nforces = len(flist)
# flist should be a list of tuples containing ( "name", forcebeads)
self.mforces = []
self.mbeads = []
self.mweights = []
self.mrpc = []
# a "function factory" to generate functions to automatically update
#contracted paths
def make_rpc(rpc, beads):
return lambda: rpc.b1tob2(depstrip(beads.q))
# creates new force objects, possibly acting on contracted path
#representations
for (ftype, fbeads) in flist:
# creates an automatically-updated contracted beads object
newb = fbeads.nbeads
newforce = fbeads.copy()
newweight = fbeads.weight
# if the number of beads for this force component is unspecified,
#assume full force evaluation
if newb == 0:
newb = beads.nbeads
newforce.nbeads = newb
newbeads = Beads(beads.natoms, newb)
newrpc = nm_rescale(beads.nbeads, newb)
dget(newbeads,"q")._func = make_rpc(newrpc, beads)
for b in newbeads:
# must update also indirect access to the beads coordinates
dget(b,"q")._func = dget(newbeads,"q")._func
# makes newbeads.q depend from beads.q
dget(beads,"q").add_dependant(dget(newbeads,"q"))
#now we create a new forcebeads which is bound to newbeads!
newforce.bind(newbeads, cell)
#adds information we will later need to the appropriate lists.
self.mweights.append(newweight)
self.mbeads.append(newbeads)
self.mforces.append(newforce)
self.mrpc.append(newrpc)
#now must expose an interface that gives overall forces
dset(self,"f",
depend_array(name="f",value=np.zeros((self.nbeads,3*self.natoms)),
func=self.f_combine,
dependencies=[dget(ff, "f") for ff in self.mforces] ) )
# collection of pots and virs from individual ff objects
dset(self,"pots",
depend_array(name="pots", value=np.zeros(self.nbeads,float),
func=self.pot_combine,
dependencies=[dget(ff, "pots") for ff in self.mforces]) )
# must take care of the virials!
dset(self,"virs",
depend_array(name="virs", value=np.zeros((self.nbeads,3,3),float),
func=self.vir_combine,
dependencies=[dget(ff, "virs") for ff in self.mforces]) )
dset(self,"extras",
depend_value(name="extras", value=np.zeros(self.nbeads,float),
func=self.extra_combine,
dependencies=[dget(ff, "extras") for ff in self.mforces]))
# total potential and total virial
dset(self,"pot",
depend_value(name="pot", func=(lambda: self.pots.sum()),
dependencies=[dget(self,"pots")]))
dset(self,"vir",
depend_array(name="vir", func=self.get_vir, value=np.zeros((3,3)),
dependencies=[dget(self,"virs")]))
