def get_restart_population(Optimizer):
"""
Function to generate a population from a folder containing existing structures.
Inputs:
Optimizer = structopt_stem Optimizer class object
Outputs:
pop = List of structopt_stem Individual class objects containing existing structures.
"""
logger = logging.getLogger(Optimizer.loggername)
index1 = 0
Optimizer.output.write('Loading structures from old run\n')
pop = []
for i in range(Optimizer.nindiv):
logger.info('reading structure {0}'.format(Optimizer.files[i].name))
successflag = False
try:
indiv = read_xyz(Optimizer.files[i].name)
successflag = True
except IOError,e:
logger.error('Not enough files in restart to generate population. Resetting nindiv to {0}'.format(i-1),exc_info=True)
Optimizer.output.write('WARNING: Not enough files in restart to generate population\n')
Optimizer.nindiv=i-1
Optimizer.output.write('Resetting nindiv = {0}\n'.format(Optimizer.nindiv))
Optimizer.output.flush()
break
except Exception,e:
Optimizer.output.write('WARNING: Trouble reading file: {0}'.format(Optimizer.files[i].name),exc_info=True)
Optimizer.output.write('Error: {0}'.format(e))
Optimizer.output.flush()
Optimizer.nindiv-=1
def get_crystal_restart_indiv(Optimizer, indiv):
"""
Function to generate an structopt Individual class object containing
a surface structure from a previously existing structure
Inputs:
Optimizer = structopt Optimizer class
indiv = ASE Atoms object containing the previously existing structure
Outputs:
individ = structopt Individual class object containing surface structure data
*** WARNING: This function is currently degenerate! ***
"""
crys = read_xyz(Optimizer.crysfile)
#Recover cell from Structure Summary file
# f = open(Optimizer.files[-1],'r')
# sline = f.readline()
# lines = f.readlines()
# popbygen = []
# n=0
# for line in lines:
# if 'Generation' in line:
# if len(popbygen) != 0:
# popbygen.append(genlist)
# genlist = []
# else:
# genlist.append(line)
# f.close()
cells = Optimizer.cryscell
crys.set_cell(cells)
individ=Individual(crys)
return individ
def get_crystal_restart_indiv(Optimizer, indiv):
"""
Function to generate an structopt Individual class object containing
a surface structure from a previously existing structure
Inputs:
Optimizer = structopt Optimizer class
indiv = ASE Atoms object containing the previously existing structure
Outputs:
individ = structopt Individual class object containing surface structure data
*** WARNING: This function is currently degenerate! ***
"""
crys = read_xyz(Optimizer.crysfile)
#Recover cell from Structure Summary file
# f = open(Optimizer.files[-1],'r')
# sline = f.readline()
# lines = f.readlines()
# popbygen = []
# n=0
# for line in lines:
# if 'Generation' in line:
# if len(popbygen) != 0:
# popbygen.append(genlist)
# genlist = []
# else:
# genlist.append(line)
# f.close()
cells = Optimizer.cryscell
crys.set_cell(cells)
individ = Individual(crys)
return individ
def gen_solid(solidfile, solidcell, outfilename, calc=False, calcmeth=None):
"""Function to load a bulk solid from a file for use in Defect structure optimization
Inputs:
solidfile=String of filename to load
solidcell=List/Matrix of cell parameters for ASE Atoms class
outfilename=String of filename to write solid
calc=False/calculator object for evaluating energy of solid
calcmeth='VASP' or other method for calculating the energy of the solid
Outputs:
solid as ASE Atoms class
energy and string if calc is not false
"""
try:
sol = read_xyz(solidfile)
except Exception as e1:
try:
sol = read(solidfile)
except Exception as e2:
raise RuntimeError('Encountered errror:' + repr(e1) + ' ' +
repr(e2) +
' While trying to read solid file given as:' +
repr(solidfile))
cell = solidcell
sol.set_cell(cell)
sol.set_pbc(True)
#Evaluate pure Bulk structure
if calc:
cwd = os.getcwd()
sol.set_calculator(calc)
stro = ''
try:
if calcmeth == 'VASP':
en = sol.get_potential_energy()
calcb = Vasp(restart=True)
sol = calcb.get_atoms()
PureBulkEnpa = en / sol.get_number_of_atoms()
else:
OUT = sol.calc.calculate(sol)
PureBulkEnpa = OUT['thermo'][-1][
'pe'] / sol.get_number_of_atoms()
sol = OUT['atoms']
sol.set_pbc(True)
except:
stro = 'WARNING: Unable to calculate energy of pure bulk solid'
PureBulkEnpa = 0
os.chdir(cwd)
# Write bulk file to directory
write_xyz(outfilename, sol, PureBulkEnpa)
return sol, PureBulkEnpa, stro
else:
# Write bulk file to directory
write_xyz(outfilename, sol, 'Pure Bulk')
return sol
def gen_solid(solidfile,solidcell,outfilename,calc=False,calcmeth=None):
"""Function to load a bulk solid from a file for use in Defect structure optimization
Inputs:
solidfile=String of filename to load
solidcell=List/Matrix of cell parameters for ASE Atoms class
outfilename=String of filename to write solid
calc=False/calculator object for evaluating energy of solid
calcmeth='VASP' or other method for calculating the energy of the solid
Outputs:
solid as ASE Atoms class
energy and string if calc is not false
"""
try:
sol = read_xyz(solidfile)
except Exception as e1:
try:
sol = read(solidfile)
except Exception as e2:
raise RuntimeError('Encountered errror:'+repr(e1)+' '+repr(e2)+
' While trying to read solid file given as:'+repr(solidfile))
cell = solidcell
sol.set_cell(cell)
sol.set_pbc(True)
#Evaluate pure Bulk structure
if calc:
cwd = os.getcwd()
sol.set_calculator(calc)
stro = ''
try:
if calcmeth == 'VASP':
en = sol.get_potential_energy()
calcb = Vasp(restart=True)
sol = calcb.get_atoms()
PureBulkEnpa = en/sol.get_number_of_atoms()
else:
OUT = sol.calc.calculate(sol)
PureBulkEnpa = OUT['thermo'][-1]['pe']/sol.get_number_of_atoms()
sol = OUT['atoms']
sol.set_pbc(True)
except:
stro = 'WARNING: Unable to calculate energy of pure bulk solid'
PureBulkEnpa = 0
os.chdir(cwd)
# Write bulk file to directory
write_xyz(outfilename,sol,PureBulkEnpa)
return sol, PureBulkEnpa, stro
else:
# Write bulk file to directory
write_xyz(outfilename,sol,'Pure Bulk')
return sol
def get_surface_restart_indiv(Optimizer, indiv):
"""
Function to generate an structopt Individual class object containing
a surface structure from a previously existing structure
Inputs:
Optimizer = structopt Optimizer class
indiv = ASE Atoms object containing the previously existing structure
Outputs:
individ = structopt Individual class object containing surface structure data
"""
#Load surface structure
surfs = read_xyz(Optimizer.surfacefile)
cells = Optimizer.surfacecell
surfs.set_cell(cells)
surf.set_pbc([True,True,False])
top,bulks=find_top_layer(indiv,Optimizer.surftopthick)
individ=Individual(top)
individ.bulki=bulks.copy()
individ.bulko=bulks.copy()
return individ
def get_restart_population(Optimizer):
"""
Function to generate a population from a folder containing existing structures.
Inputs:
Optimizer = structopt_stem Optimizer class object
Outputs:
pop = List of structopt_stem Individual class objects containing existing structures.
"""
logger = logging.getLogger(Optimizer.loggername)
index1 = 0
Optimizer.output.write('Loading structures from old run\n')
pop = []
for i in range(Optimizer.nindiv):
logger.info('reading structure {0}'.format(Optimizer.files[i].name))
successflag = False
try:
indiv = read_xyz(Optimizer.files[i].name)
successflag = True
except IOError, e:
logger.error(
'Not enough files in restart to generate population. Resetting nindiv to {0}'
.format(i - 1),
exc_info=True)
Optimizer.output.write(
'WARNING: Not enough files in restart to generate population\n'
)
Optimizer.nindiv = i - 1
Optimizer.output.write('Resetting nindiv = {0}\n'.format(
Optimizer.nindiv))
Optimizer.output.flush()
break
except Exception, e:
Optimizer.output.write('WARNING: Trouble reading file: {0}'.format(
Optimizer.files[i].name),
exc_info=True)
Optimizer.output.write('Error: {0}'.format(e))
Optimizer.output.flush()
Optimizer.nindiv -= 1
def get_surface_indiv(Optimizer):
"""
Function to generate an structopt Individual class object containing as surface structure.
Inputs:
Optimizer = structopt Optimizer class
Outputs:
individ = structopt Individual class object containing surface structure data
"""
#Load surface structure
surfs = read_xyz(Optimizer.surfacefile)
cells = Optimizer.surfacecell
surfs.set_cell(cells)
surf.set_pbc([True, True, False])
#Find top layer
top, bulks = find_top_layer(surfs, Optimizer.surftopthick)
mutopto = Optimizer.mutation_options
Optimizer.mutation_options = ['lattice_alteration_rdrd']
topind = top.copy()
ind = moves_switch(topind, Optimizer)
Optimizer.mutation_options = mutopto
individ = Individual(ind)
individ.bulki = bulks.copy()
individ.bulko = bulks.copy()
return individ
def get_surface_indiv(Optimizer):
"""
Function to generate an structopt Individual class object containing as surface structure.
Inputs:
Optimizer = structopt Optimizer class
Outputs:
individ = structopt Individual class object containing surface structure data
"""
#Load surface structure
surfs = read_xyz(Optimizer.surfacefile)
cells = Optimizer.surfacecell
surfs.set_cell(cells)
surf.set_pbc([True,True,False])
#Find top layer
top,bulks=find_top_layer(surfs,Optimizer.surftopthick)
mutopto = Optimizer.mutation_options
Optimizer.mutation_options = ['lattice_alteration_rdrd']
topind = top.copy()
ind = moves_switch(topind,Optimizer)
Optimizer.mutation_options = mutopto
individ = Individual(ind)
individ.bulki = bulks.copy()
individ.bulko = bulks.copy()
return individ
def get_lattice_concentration(bulkfile,indivfile):
"""Function to identify the lattice concentration of atoms in a bulk structure compared to a
structure with a defect.
Inputs:
bulkfile = filename for starting structure with original lattice atoms
indivfile = filename for structure to compare
Outputs:
File: LatticeConcentration.txt in working directory. Includes summary of concentration
of each atom type and vacancies
** Note: Currently limited to cubic structures **
"""
# Load Bulk Solid File
solid=read_xyz(bulkfile)
# Get lattice sites for bulk
#Identify nearest neighbor distance
solid.set_pbc(True)
distmin=[]
for i in range(20):
dist=[]
for j in range(len(solid)):
if i !=j:
d = calc_dist(solid[i],solid[j])
dist.append(d)
distmin.append(min(dist))
nndist=sum([one for one,x,y,z in distmin])/len(distmin)
nnxd=sum([x for one,x,y,z in distmin])/len(distmin)
nnyd=sum([y for one,x,y,z in distmin])/len(distmin)
nnzd=sum([z for one,x,y,z in distmin])/len(distmin)
solid.translate([nnxd/2.0,nnyd/2.0,nnzd/2.0])
# Get size of cell for pbc
cell = numpy.maximum.reduce(solid.get_positions())
cell += [nnxd/2.0,nnyd/2.0,nnzd/2.0]
# Initialize boxes
nx=int(math.ceil(float(cell[0])/float(nnxd)))
ny=int(math.ceil(float(cell[1])/float(nnyd)))
nz=int(math.ceil(float(cell[2])/float(nnzd)))
bxarray0=[[0,[]] for i in range(nx*ny*nz)]
# Identify which atoms are in which box
positions=solid.get_positions()
for i in range(len(solid)):
box=[math.floor(positions[i][0]/nnxd),math.floor(positions[i][1]/nnyd),math.floor(positions[i][2]/nnzd)]
bxarray0[int((nx*ny)*(box[2])+nx*(box[1])+box[0])][0]+=1
bxarray0[int((nx*ny)*(box[2])+nx*(box[1])+box[0])][1]+=[solid[i].symbol]
#Get types of atoms for bulk and bulk lattice concentration
nlatsites=len(solid)
syms =list(set([atm.symbol for atm in solid]))
nsyms = []
for one in syms:
numberofsym=len([atm for atm in solid if atm.symbol==one])
nsyms.append(float(numberofsym)/float(nlatsites))
concentbulk=zip(syms,nsyms)
#Get Lattice sites for individual
onlatcon=[[-1,concentbulk]]
n=0
while True:
try:
indiv=read_xyz(indivfile,n)
except:
break
indiv.translate([nnxd/2.0,nnyd/2.0,nnzd/2.0])
bxarray=[[0,[],[]] for i in range(nx*ny*nz)]
positions=indiv.get_positions()
# Wrap positions in individual to cell size
for i in range(len(positions)):
while positions[i][0] > cell[0]:
positions[i][0]=positions[i][0]-cell[0]
while positions[i][1] > cell[1]:
positions[i][1]=positions[i][1]-cell[1]
while positions[i][2] > cell[2]:
positions[i][2]=positions[i][2]-cell[2]
while positions[i][0] < 0:
positions[i][0]=positions[i][0]+cell[0]
while positions[i][1] < 0:
positions[i][1]=positions[i][1]+cell[1]
while positions[i][2] < 0:
positions[i][2]=positions[i][2]+cell[2]
for i in range(len(indiv)):
box=[math.floor(positions[i][0]/nnxd),math.floor(positions[i][1]/nnyd),math.floor(positions[i][2]/nnzd)]
bxarray[int((nx*ny)*(box[2])+nx*(box[1])+box[0])][0]+=1
bxarray[int((nx*ny)*(box[2])+nx*(box[1])+box[0])][1]+=[indiv[i].symbol]
bxarray[int((nx*ny)*(box[2])+nx*(box[1])+box[0])][2]+=[i]
# Get on-lattice concentration
latsyms=[]
for i in range(len(bxarray0)):
if bxarray0[i][0]!=0:
if len(bxarray[i][1])==1:
latsyms.extend(bxarray[i][1])
elif len(bxarray[i][1]) >1:
if bxarray[i][1][0] in bxarray[i][1]:
latsyms.extend(bxarray0[i][1])
else:
latsyms.append('Vacancy')
reducedsyms=list(set(latsyms))
concenti=[]
for one in reducedsyms:
numberofsym=len([atm for atm in latsyms if atm==one])
concenti.append(float(numberofsym)/float(nlatsites))
concents=zip(reducedsyms,concenti)
onlatcon.append([n,concents])
n+=1
maxlen=max([len(con) for n,con in onlatcon])
maxsyms=[con for n,con in onlatcon if len(con)==maxlen]
symlist=[sym for sym,n in maxsyms[0]]
output=open('LatticeConcentration.txt','a')
output.write('Generation ')
for one in symlist:
output.write(repr(one)+' ')
output.write('TotalSites \n')
for n,con in onlatcon:
output.write(repr(n)+' ')
for sym in symlist:
num=[count for atm,count in con if atm==sym]
num=sum(num)
output.write(repr(num)+' ')
output.write(repr(nlatsites)+'\n')
output.close()
def __init__(self, input, uselogger=True):
if input:
parameters = inp_out.read_parameter_input(input, uselogger)
else:
parameters = inp_out.read_parameter_input({'atomlist':[('Xx',1,0,0)],'structure':'Cluster'}, uselogger)
self.__dict__.update(parameters)
try:
rank = MPI.COMM_WORLD.Get_rank()
except:
rank = 0
if 'stem' in parameters['fitness_scheme']:
if rank == 0 :
nk = self.stemcalc.parameters['Pixels']
self.stemcalc.psf = np.empty([nk,nk],dtype=float)
# ZS
try:
fileobj = open(parameters['psf'],'r')
except KeyError:
fileobj = open('/home/usitguest/USIT/dropbox_app/PSF.txt', 'r')
lines = fileobj.readlines()
for x in range(0,nk):
self.stemcalc.psf[x] = lines[x].split()
fileobj.close()
#self.stemcalc.psf = tools.StemCalc.get_probe_function(self.stemcalc.parameters)
else:
self.stemcalc.psf = None
self.stemcalc.psf = MPI.COMM_WORLD.bcast(self.stemcalc.psf,root=0)
if self.loggername:
global logger
logger = logging.getLogger(self.loggername)
if self.restart_optimizer:
try:
rank = MPI.COMM_WORLD.Get_rank()
except:
rank = 0
if rank==0:
logger.info('restarting output')
outdict = inp_out.restart_output(self)
self.__dict__.update(outdict)
logger.info('Loading individual files')
poplist = []
for indfile in self.population:
ind = inp_out.read_individual(indfile)
poplist.append(ind)
self.population = poplist
logger.info('Loading bests')
bestlist = []
for bestfile in self.BESTS:
ind = inp_out.read_individual(bestfile)
bestlist.append(ind)
self.BESTS = bestlist
self.restart = True
if self.structure == 'Defect':
bulk = inp_out.read_xyz(self.solidfile)
bulk.set_pbc(True)
bulk.set_cell(self.solidcell)
self.solidbulk = bulk.copy()
else:
self.solidbulk = None
else:
self.convergence = False
self.generation = 0
self.Runtimes = [time.time()]
self.Evaluations = list()
self.CXs = list()
self.Muts = list()
self.cxattempts = 0
self.mutattempts = list()
self.BESTS = list()
self.genrep = 0
self.minfit = 0
self.convergence = False
self.overrideconvergence = False
self.population = list()
self.calc = None
self.static_calc = None
def get_lattice_concentration(bulkfile, indivfile):
"""Function to identify the lattice concentration of atoms in a bulk structure compared to a
structure with a defect.
Inputs:
bulkfile = filename for starting structure with original lattice atoms
indivfile = filename for structure to compare
Outputs:
File: LatticeConcentration.txt in working directory. Includes summary of concentration
of each atom type and vacancies
** Note: Currently limited to cubic structures **
"""
# Load Bulk Solid File
solid = read_xyz(bulkfile)
# Get lattice sites for bulk
#Identify nearest neighbor distance
solid.set_pbc(True)
distmin = []
for i in range(20):
dist = []
for j in range(len(solid)):
if i != j:
d = calc_dist(solid[i], solid[j])
dist.append(d)
distmin.append(min(dist))
nndist = sum([one for one, x, y, z in distmin]) / len(distmin)
nnxd = sum([x for one, x, y, z in distmin]) / len(distmin)
nnyd = sum([y for one, x, y, z in distmin]) / len(distmin)
nnzd = sum([z for one, x, y, z in distmin]) / len(distmin)
solid.translate([nnxd / 2.0, nnyd / 2.0, nnzd / 2.0])
# Get size of cell for pbc
cell = numpy.maximum.reduce(solid.get_positions())
cell += [nnxd / 2.0, nnyd / 2.0, nnzd / 2.0]
# Initialize boxes
nx = int(math.ceil(float(cell[0]) / float(nnxd)))
ny = int(math.ceil(float(cell[1]) / float(nnyd)))
nz = int(math.ceil(float(cell[2]) / float(nnzd)))
bxarray0 = [[0, []] for i in range(nx * ny * nz)]
# Identify which atoms are in which box
positions = solid.get_positions()
for i in range(len(solid)):
box = [
math.floor(positions[i][0] / nnxd),
math.floor(positions[i][1] / nnyd),
math.floor(positions[i][2] / nnzd)
]
bxarray0[int((nx * ny) * (box[2]) + nx * (box[1]) + box[0])][0] += 1
bxarray0[int((nx * ny) * (box[2]) + nx * (box[1]) +
box[0])][1] += [solid[i].symbol]
#Get types of atoms for bulk and bulk lattice concentration
nlatsites = len(solid)
syms = list(set([atm.symbol for atm in solid]))
nsyms = []
for one in syms:
numberofsym = len([atm for atm in solid if atm.symbol == one])
nsyms.append(float(numberofsym) / float(nlatsites))
concentbulk = zip(syms, nsyms)
#Get Lattice sites for individual
onlatcon = [[-1, concentbulk]]
n = 0
while True:
try:
indiv = read_xyz(indivfile, n)
except:
break
indiv.translate([nnxd / 2.0, nnyd / 2.0, nnzd / 2.0])
bxarray = [[0, [], []] for i in range(nx * ny * nz)]
positions = indiv.get_positions()
# Wrap positions in individual to cell size
for i in range(len(positions)):
while positions[i][0] > cell[0]:
positions[i][0] = positions[i][0] - cell[0]
while positions[i][1] > cell[1]:
positions[i][1] = positions[i][1] - cell[1]
while positions[i][2] > cell[2]:
positions[i][2] = positions[i][2] - cell[2]
while positions[i][0] < 0:
positions[i][0] = positions[i][0] + cell[0]
while positions[i][1] < 0:
positions[i][1] = positions[i][1] + cell[1]
while positions[i][2] < 0:
positions[i][2] = positions[i][2] + cell[2]
for i in range(len(indiv)):
box = [
math.floor(positions[i][0] / nnxd),
math.floor(positions[i][1] / nnyd),
math.floor(positions[i][2] / nnzd)
]
bxarray[int((nx * ny) * (box[2]) + nx * (box[1]) + box[0])][0] += 1
bxarray[int((nx * ny) * (box[2]) + nx * (box[1]) +
box[0])][1] += [indiv[i].symbol]
bxarray[int((nx * ny) * (box[2]) + nx * (box[1]) +
box[0])][2] += [i]
# Get on-lattice concentration
latsyms = []
for i in range(len(bxarray0)):
if bxarray0[i][0] != 0:
if len(bxarray[i][1]) == 1:
latsyms.extend(bxarray[i][1])
elif len(bxarray[i][1]) > 1:
if bxarray[i][1][0] in bxarray[i][1]:
latsyms.extend(bxarray0[i][1])
else:
latsyms.append('Vacancy')
reducedsyms = list(set(latsyms))
concenti = []
for one in reducedsyms:
numberofsym = len([atm for atm in latsyms if atm == one])
concenti.append(float(numberofsym) / float(nlatsites))
concents = zip(reducedsyms, concenti)
onlatcon.append([n, concents])
n += 1
maxlen = max([len(con) for n, con in onlatcon])
maxsyms = [con for n, con in onlatcon if len(con) == maxlen]
symlist = [sym for sym, n in maxsyms[0]]
output = open('LatticeConcentration.txt', 'a')
output.write('Generation ')
for one in symlist:
output.write(repr(one) + ' ')
output.write('TotalSites \n')
for n, con in onlatcon:
output.write(repr(n) + ' ')
for sym in symlist:
num = [count for atm, count in con if atm == sym]
num = sum(num)
output.write(repr(num) + ' ')
output.write(repr(nlatsites) + '\n')
output.close()
'Scale Factor': 0.00570113
}
# calculate ref STEM image
'''
fp = open('../archive_input_options.txt')
data = fp.readlines()
for line in range(len(data)):
if "'psf':" in data[line]:
parameters['psf'] = ast.literal_eval(data[line].strip())['psf']
if "'stem_ref':" in data[line]:
parameters['stem_ref'] = ast.literal_eval(data[line].strip())['stem_ref']
'''
A = ConvStem(parameters=autostemparameters, calc_exp=False)
try:
atoms_ref = inp_out.read_xyz(parameters['stem_ref'], 0)
except KeyError:
atoms_ref = inp_out.read_xyz(
'/home/usitguest/USIT/dropbox_app/STEM_ref', 0)
nk = autostemparameters['Pixels']
A.psf = np.empty([nk, nk], dtype=float)
try:
fileobj = open(parameters['psf'], 'r')
except KeyError:
fileobj = open('/home/usitguest/USIT/dropbox_app/PSF.txt', 'r')
lines = fileobj.readlines()
for x in range(0, nk):
A.psf[x] = lines[x].split()
fileobj.close()
aber=[[0,0],[0,0],[22.56,-20.1],[22.08,-7.5],[0.1198,0],[0.9018,-170.1],[0.04964,20.9],[28.43,-120.6],[11.84,153.8],[8.456,76.1],[0.622,0],[2.811,-125.5]]
autostemparameters={'Electron energy': 200,'Spherical aberration': 1.4,'Defocus':0,'Aperture semiangle': 24.5,'Source size': 0.882,'Slice size': 25.0,'Pixels':976,'Chromatic aberration Coefficient':1.4,'Delta E':0.73,'aber':aber,'Scale Factor':0.00570113}
# calculate ref STEM image
'''
fp = open('../archive_input_options.txt')
data = fp.readlines()
for line in range(len(data)):
if "'psf':" in data[line]:
parameters['psf'] = ast.literal_eval(data[line].strip())['psf']
if "'stem_ref':" in data[line]:
parameters['stem_ref'] = ast.literal_eval(data[line].strip())['stem_ref']
'''
A = ConvStem(parameters=autostemparameters,calc_exp=False)
try:
atoms_ref=inp_out.read_xyz(parameters['stem_ref'],0)
except KeyError:
atoms_ref=inp_out.read_xyz('/home/usitguest/USIT/dropbox_app/STEM_ref',0)
nk = autostemparameters['Pixels']
A.psf = np.empty([nk,nk],dtype=float)
try:
fileobj = open(parameters['psf'], 'r')
except KeyError:
fileobj = open('/home/usitguest/USIT/dropbox_app/PSF.txt', 'r')
lines = fileobj.readlines()
for x in range(0,nk):
A.psf[x] = lines[x].split()
fileobj.close()
STEM_ref = A.get_image(A.psf, atoms_ref, autostemparameters['Slice size'], autostemparameters['Pixels'])