def mep_first(xcc,
gcc,
Fcc,
symbols,
masses,
var_first,
spc_fnc,
spc_args,
drst={},
parallel=False):
#global PARALLEL, delayed, multiprocessing, Parallel
#PARALLEL, delayed, multiprocessing, Parallel = fncs.set_parallel(parallel)
ds, mu, cubic, idir = var_first
# convert cubic variable to d3 (in bohr)
d3 = cubic2float(cubic)
# mass-scaled
xcc = fncs.shift2com(xcc, masses)
xms = fncs.cc2ms_x(xcc, masses, mu)
gms = fncs.cc2ms_g(gcc, masses, mu)
Fms = fncs.cc2ms_F(Fcc, masses, mu)
# Data in backup?
if TSLABEL in drst.keys():
si, E, xms2, gms, Fms, v0, v1, t = drst[TSLABEL]
gms = np.array(gms)
Fms = np.array(Fms)
v0 = np.array(v0)
if v1 is not None: v1 = np.array(v1)
same = fncs.same_geom(xms, xms2)
if not same: raise Exc.RstDiffTS(Exception)
else:
# Calculation of v0
freqs, evals, evecs = fncs.calc_ccfreqs(Fcc, masses, xcc)
ifreq, Lms = get_imagfreq(freqs, evecs)
v0 = fncs.normalize_vec(Lms)
v0 = correctdir_v0(xms, v0, idir, masses, mu)
# Calculation of v1
if d3 is None: v1 = None
else:
v1 = calculate_v1(xms, v0, Fms, symbols, masses, mu, d3, spc_fnc,
spc_args, parallel)
# Final structures
if d3 is None:
xms_bw = sd_taylor(xms, ds, v0=-v0)
xms_fw = sd_taylor(xms, ds, v0=+v0)
else:
xms_bw = sd_taylor(xms, ds, v0=-v0, v1=-v1)
xms_fw = sd_taylor(xms, ds, v0=+v0, v1=+v1)
return (xms, gms, Fms), (v0, v1), (xms_bw, xms_fw)
def setup(self, mu=1.0 / AMU, projgrad=False):
self._mu = mu
# derivated magnitudes (again, in case sth was modified)
# for example, when set from gts and masses are added latter
self.genderivates()
# shift to center of mass and reorientate molecule
idata = (self._xcc, self._gcc, self._Fcc, self._masses)
self._xcc, self._gcc, self._Fcc = fncs.center_and_orient(*idata)
# symmetry
self.calc_pgroup(force=False)
# Generate mass-scaled arrays
self._xms = fncs.cc2ms_x(self._xcc, self._masses, self._mu)
self._gms = fncs.cc2ms_g(self._gcc, self._masses, self._mu)
self._Fms = fncs.cc2ms_F(self._Fcc, self._masses, self._mu)
#-------------#
# Atomic case #
#-------------#
if self._natoms == 1:
self._nvdof = 0
self._linear = False
#self._xms = list(self._xcc)
#self._gms = list(self._gcc)
#self._Fms = list(self._Fcc)
self._ccfreqs = []
self._ccFevals = []
self._ccFevecs = []
#----------------#
# Molecular case #
#----------------#
else:
# Calculate inertia
self._itensor = fncs.get_itensor_matrix(self._xcc, self._masses)
self._imoms, self._rotTs, self._rtype, self._linear = \
fncs.get_itensor_evals(self._itensor)
# Vibrational degrees of freedom
if self._linear: self._nvdof = 3 * self._natoms - 5
else: self._nvdof = 3 * self._natoms - 6
# calculate frequencies
if self._Fcc is None: return
if len(self._Fcc) == 0: return
if self._ccfreqs is not None: return
v0 = self._gms if projgrad else None
data = fncs.calc_ccfreqs(self._Fcc,
self._masses,
self._xcc,
self._mu,
v0=v0)
self._ccfreqs, self._ccFevals, self._ccFevecs = data
# Scale frequencies
self._ccfreqs = fncs.scale_freqs(self._ccfreqs, self._fscal)
def steepest(xcc0,s0,symbols,masses,pathdata,spc_fnc,spc_args,drst={},lFms=None,pf="%i"):
'''
x0 should not be a saddle point
pathdata: tuple made of:
* method
pm for Page-McIver
es for Euler
* mu
* ds
* nsteps
* hsteps
* epse
* epsg
pf: point format
'''
# expand pathdata
method,mu,ds,sfinal,hsteps,epse,epsg = pathdata
nsteps = int(round(abs(sfinal/ds)))
# Check some staff
if lFms is None and method == "pm": raise Exc.SDpmNoHess(Exception)
# loop
s_i = s0
xcc_i = xcc0
listE = []
listg = []
for step in range(1,nsteps+1):
point = pf%step
# calculate hessian?
if step%hsteps == 0: bhessian = True
else : bhessian = False
# previously calculated vs single-point calculation
if point in drst.keys():
s_ii, E_i, xms_i, gms_i, Fms_i, v0, v1, t_i = drst[point]
# in cc
gcc_i = fncs.ms2cc_g(gms_i,masses,mu)
# compare geometry
exception = Exc.RstDiffPoint(Exception)
exception._var = (point,s_i)
if abs(s_ii-s_i) > EPS_MEPS: raise exception
same = fncs.same_geom(fncs.cc2ms_x(xcc_i,masses,mu),xms_i)
if not same: raise exception
else:
spc_data = spc_fnc(xcc_i,symbols,bhessian,point,spc_args)
xcc_i, atnums, ch, mtp, E_i, gcc_i, Fcc_i, dummy = spc_data
# Data in mass-scaled and correct format
Fcc_i = fncs.lowt2matrix(Fcc_i)
xms_i = fncs.cc2ms_x(xcc_i,masses,mu)
gms_i = fncs.cc2ms_g(gcc_i,masses,mu)
Fms_i = fncs.cc2ms_F(Fcc_i,masses,mu)
t_i = None
# keep data for eps
listE.append(E_i)
listg.append(fncs.norm(gcc_i))
# Last Fms
if Fms_i not in [[],None]: lFms = Fms_i
# Calculate new geometry (step+1)
if method == "es":
xms_j, t_i = sd_taylor(xms_i,ds,gms=gms_i), None # to check format
elif method == "pm":
xms_j, t_i = pm_nextxms(xms_i,ds,gms=gms_i,Fms=lFms,t0=t_i)
# check real ds value
diff_ds2 = sum([(ii-jj)**2 for (ii,jj) in zip(xms_j,xms_i)]) - ds**2
if diff_ds2 > EPS_FLOAT: raise Exc.SDdiffds(Exception)
# Yield updated data for step
yield (point,s_i), E_i, xms_i, gms_i, Fms_i, t_i
# update
xcc_i = fncs.ms2cc_x(xms_j,masses,mu)
if s_i >= 0.0: s_i += ds
else : s_i -= ds
# Check eps
if len(listE) > 2 and step > 2*hsteps:
diffE = abs(listE[-1]-listE[-2])
#diffg = abs(listg[-1]-listg[-2])
crit1 = diffE < epse
crit2 = listg[-1] < epsg
if crit1 and crit2: break