def _WriteMEADFiles(self, system, systemCharges, systemRadii):
"""For each instance of each site, write:
- PQR file for the site - PQR file for the model compound
- OGM file for the site - MGM file for the model compound"""
grids = []
model = self.parent
for stepIndex, (nodes, resolution) in enumerate(model.focusingSteps):
if stepIndex < 1:
grids.append("ON_GEOM_CENT %d %f\n" % (nodes, resolution))
else:
x, y, z = self.center
grids.append("(%f %f %f) %d %f\n" %
(x, y, z, nodes, resolution))
selectSite = Selection(self.siteAtomIndices)
selectModel = Selection(self.modelAtomIndices)
# . In the PQR file of the model compound, charges of the site atoms must be set to zero (requirement of the my_2diel_solver program)
chargesZeroSite = Clone(systemCharges)
for atomIndex in self.siteAtomIndices:
chargesZeroSite[atomIndex] = 0.0
for instance in self.instances:
PQRFile_FromSystem(
instance.modelPqr,
system,
selection=selectModel,
charges=chargesZeroSite,
radii=systemRadii,
)
# . Update system charges with instance charges
chargesInstance = Clone(systemCharges)
for chargeIndex, atomIndex in enumerate(self.siteAtomIndices):
chargesInstance[atomIndex] = instance.charges[chargeIndex]
PQRFile_FromSystem(
instance.sitePqr,
system,
selection=selectSite,
charges=chargesInstance,
radii=systemRadii,
)
del chargesInstance
# . Write OGM and MGM files (they have the same content)
for fileGrid in (instance.modelGrid, instance.siteGrid):
WriteInputFile(fileGrid, grids)
del chargesZeroSite
def _PlaceIonsAtGridPoints ( ions, grid, unoccupied ):
"""Place ions at grid points."""
#
# . Placement is currently done randomly. In principle it could also be done using energies using a procedure such as:
#
# - Calculate potentials (1/r,1/r^6,1/r^12) on unoccupied grid points due to protein.
# - Loop over ions (+/- alternate pairs):
# Determine energy of each grid points as q * pot(1/r) + e * s^3 * pot(1/r^6) + ...
# Find point with lowest energy and put ion at this point.
# Update potentials due to the ion at this point.
#
# . Requires a single NB model method that calculates/updates potentials.
#
# . However, a similar result can be achieved by using random placement, doing a Monte Carlo (no waters) with
# . an NBModel with dielectric of 80 and then choosing low energy conformations.
#
# . Number of ions.
nions = len ( ions.atoms )
# . Get a random number of points from the unoccupied sites.
points = sample ( unoccupied, nions )
# . Calculate the coordinates - these are implicitly sorted due to the selection.
coordinates3 = Coordinates3_FromGrid ( grid, selection = Selection.FromIterable ( points ) )
# . Shuffle again.
points = sample ( range ( nions ), nions )
for ( n, p ) in enumerate ( points ):
for i in range ( 3 ): ions.coordinates3[n,i] = coordinates3[p,i]
def CovarianceMatrix(*arguments, **keywordArguments):
"""Calculate the covariance matrix for selected particles."""
# . Initialization.
covariance = None
# . Get the trajectory and associated system data.
(system, trajectories) = _GetSystemAndTrajectoriesFromArguments(*arguments)
# . Get the selection and the size of the problem.
selection = keywordArguments.pop("selection", None)
if selection is None:
selection = Selection.FromIterable(range(len(system.atoms)))
n = 3 * len(selection)
# . Get the average positions.
averagePositions = keywordArguments.pop("averagePositions", None)
if averagePositions is None:
averagePositions = AveragePositions(trajectories, selection=selection)
_CheckForUnknownOptions(keywordArguments)
# . Continue processing.
if (n > 0) and (averagePositions is not None):
# . Allocate space.
covariance = SymmetricMatrix.WithExtent(n)
covariance.Set(0.0)
displacement = Real1DArray.WithExtent(n)
displacement.Set(0.0)
# . Loop over trajectory frames.
numberFrames = 0
for trajectory in trajectories:
trajectory.ReadHeader()
while trajectory.RestoreOwnerData():
frame = system.coordinates3
for (p, i) in enumerate(selection):
displacement[3 * p] = frame[i, 0] - averagePositions[p, 0]
displacement[3 * p +
1] = frame[i, 1] - averagePositions[p, 1]
displacement[3 * p +
2] = frame[i, 2] - averagePositions[p, 2]
for i in range(n):
dI = displacement[i]
for j in range(i + 1):
covariance[i, j] += (dI * displacement[j])
trajectory.ReadFooter()
trajectory.Close()
numberFrames += len(trajectory)
# . Scale.
if numberFrames > 0: covariance.Scale(1.0 / float(numberFrames))
return covariance
def ToFixedAtoms(self, system):
"""Define fixed atoms for the system."""
natoms = self.counters.get("Atoms", 0)
if natoms > 0:
# . Get the fixed atom indices.
indices = []
for (index, datum) in enumerate(self.atoms):
flag = datum[8]
if flag == 1: indices.append(index)
# . Define the fixed atoms.
if len(indices) > 0:
system.DefineFixedAtoms(Selection.FromIterable(indices))
def BuildSolventBox ( crystalClass, symmetryParameters, molecule, density, log = logFile, randomNumberGenerator = None ):
"""Build a solvent box.
No attempt is made to avoid overlapping molecules as it is assumed this will be corrected in a subsequent optimization process.
"""
# . Initialization.
solvent = None
# . Find the number of solvent molecules that fit in the box.
nmolecules = SolventMoleculeNumber ( molecule, symmetryParameters, density )
# . Check the number of molecules.
if nmolecules > 0:
# . Create the solvent system.
molecule.coordinates3.ToPrincipalAxes ( )
solvent = MergeRepeatByAtom ( molecule, nmolecules )
solvent.DefineSymmetry ( crystalClass = crystalClass, a = symmetryParameters.a, \
b = symmetryParameters.b, \
c = symmetryParameters.c, \
alpha = symmetryParameters.alpha, \
beta = symmetryParameters.beta, \
gamma = symmetryParameters.gamma )
# . Check the random number generator.
if randomNumberGenerator is None: randomNumberGenerator = RandomNumberGenerator.WithRandomSeed ( )
# . Do random rotations and translations.
natoms = len ( molecule.atoms )
rotation = Matrix33.Null ( )
selection = Selection.FromIterable ( range ( natoms ) )
translation = Vector3.Null ( )
for i in range ( nmolecules ):
rotation.RandomRotation ( randomNumberGenerator )
solvent.coordinates3.Rotate ( rotation, selection = selection )
for j in range ( 3 ): translation[j] = randomNumberGenerator.NextReal ( )
symmetryParameters.M.ApplyTo ( translation )
solvent.coordinates3.Translate ( translation, selection = selection )
selection.Increment ( natoms )
# . Do some printing.
if LogFileActive ( log ):
summary = log.GetSummary ( )
summary.Start ( "Cubic Solvent Box Summary" )
summary.Entry ( "Number of Molecules", "{:d}" .format ( nmolecules ) )
summary.Entry ( "Density (kg m^-3)", "{:.3f}".format ( SystemDensity ( solvent ) ) )
summary.Entry ( "Box Volume", "{:.3f}".format ( solvent.symmetryParameters.volume ) )
summary.Stop ( )
# . Return the system.
return solvent
def TypeAtoms(self, connectivity, sequence, log):
"""Assign atom types and charges to the atoms."""
# . Initialization.
atomCharges = [0.0 for i in range(len(connectivity.atoms))]
atomTypes = [None for i in range(len(connectivity.atoms))]
untypedAtoms = Selection.FromIterable(range(len(atomTypes)))
# . Type the atoms.
self.TypeBySequence(sequence, atomTypes, atomCharges, untypedAtoms)
self.TypeByPattern(connectivity, atomTypes, atomCharges, untypedAtoms)
# . Check for untyped atoms.
self.CheckUntypedAtoms(connectivity, untypedAtoms, log)
# . Finish up.
return (atomTypes, atomCharges)
def FilterAtoms ( self, filterlevel ):
"""Filter out Mopac-specific atoms."""
if self.QPARSED and ( filterlevel > -3 ):
atomicNumbers = []
selected = []
for ( i, a ) in enumerate ( self.atomicNumbers ):
if a >= filterlevel:
atomicNumbers.append ( a )
selected.append ( i )
if len ( atomicNumbers ) < len ( self.atomicNumbers ):
coordinates3 = Coordinates3.WithExtent ( len ( atomicNumbers ) )
coordinates3.Gather ( self.coordinates3, Selection.FromIterable ( selected ) )
self.atomicNumbers = atomicNumbers
self.coordinates3 = coordinates3
def DefineQCModel(self, qcModel, log=logFile, qcSelection=None):
"""Define a quantum chemical model for the system."""
if isinstance(qcModel, QCModel):
# . Get an energy model in the correct state.
if self.energyModel is None:
self.__dict__["_energyModel"] = EnergyModel()
else:
self.energyModel.ClearQCModel(self.configuration,
fixedAtoms=None)
em = self.energyModel
# . Assign a default electronic state if necessary.
if self.electronicState is None:
self.electronicState = ElectronicState()
# . Get the QC atom selection and the boundary atoms.
if (qcSelection is None) or (qcSelection.size == len(self.atoms)):
atomindices = Selection.FromIterable(range(len(self.atoms)))
boundaryatoms = {}
else:
atomindices = qcSelection
boundaryatoms = em.IdentifyBoundaryAtoms(atomindices)
# . Set up the QC atom data.
qcAtoms = QCAtomContainer_FromAtomContainer(
self.atoms, atomindices, boundaryatoms,
getattr(qcModel, "linkAtomRatio", True))
# . Get the qcParameters.
anlist = qcAtoms.UniqueAtomicNumbers()
qcParameters = qcModel.DefineParameters(anlist, log=log)
# . Fill in the remaining qcatom data.
qcAtoms.AssignParameterData(anlist, qcParameters)
# . Save the data.
em.qcAtoms = qcAtoms
em.qcModel = qcModel
em.__dict__["qcParameters"] = qcParameters
em.MakeLabel()
# . Modify the MM terms if appropriate.
em.DeactivateQCAtomMMTerms()
# . Deactivate MM terms if fixed atoms are defined.
if (self.hardConstraints is not None):
em.DeactivateFixedAtomMMTerms(self.hardConstraints.fixedAtoms)
# . Check the total MM charge.
em.CheckActiveMMAtomTotalCharge()
def AveragePositions(*arguments, **keywordArguments):
"""Calculate the average positions for selected particles."""
# . Initialization.
positions = None
# . Process arguments.
(system, trajectories) = _GetSystemAndTrajectoriesFromArguments(*arguments)
# . Get the selection (or all particles otherwise).
selection = keywordArguments.pop("selection", None)
if selection is None:
selection = Selection.FromIterable(range(len(system.atoms)))
_CheckForUnknownOptions(keywordArguments)
# . Get the size of the problem.
n = len(selection)
if n > 0:
# . Allocate space.
positions = Coordinates3.WithExtent(n)
positions.Set(0.0)
# . Loop over trajectory frames.
numberFrames = 0
for trajectory in trajectories:
trajectory.ReadHeader()
while trajectory.RestoreOwnerData():
frame = system.coordinates3
for (p, i) in enumerate(selection):
positions[p, 0] += frame[i, 0]
positions[p, 1] += frame[i, 1]
positions[p, 2] += frame[i, 2]
trajectory.ReadFooter()
trajectory.Close()
numberFrames += len(trajectory)
# . Scale.
if numberFrames > 0: positions.Scale(1.0 / float(numberFrames))
return positions
def SetUpSystem(path, forceNoQC=False, useSystemWithTimings=True):
"""Set up the system."""
# . Get system data.
systemData = YAMLUnpickle(os.path.join(path, _TestDataFileName))
# . Get the parameters.
parameters = CHARMMParameterFiles_ToParameters(
glob.glob(os.path.join(path, "*.prm")))
# . Get the test name.
name = os.path.split(path)[-1]
# . Generate the system.
system = CHARMMPSFFile_ToSystem(os.path.join(path, name + ".psfx"),
isXPLOR=True,
parameters=parameters)
if useSystemWithTimings: system = SystemWithTimings.FromSystem(system)
system.coordinates3 = XYZFile_ToCoordinates3(
os.path.join(path, name + ".xyz"))
system.label = systemData["Label"]
# . Symmetry.
if systemData.get("Crystal Class", None) is not None:
symmetryOptions = systemData["Symmetry Parameters"]
symmetryOptions["crystalClass"] = _CrystalClasses[
systemData["Crystal Class"]]
system.DefineSymmetry(**symmetryOptions)
# . QC data.
if not forceNoQC:
qcData = systemData.get(_QCRegionKey, None)
if qcData is not None:
# . Electronic state.
system.electronicState = ElectronicState(
charge=qcData.get("Charge", 0),
multiplicity=qcData.get("Multiplicity", 1))
# . QC atoms.
qcAtoms = set()
for path in qcData["Atoms"]:
index = system.sequence.AtomIndex(path)
qcAtoms.add(index)
system.DefineQCModel(_QCModel, qcSelection=Selection(qcAtoms))
# . Finish set up.
system.DefineNBModel(_NBModel)
return system
def ExtractDisorderData ( self, dataBlock, system, disorderGroup = _DefaultDisorderGroup ):
"""Extract atom data from a data block."""
result = system
table = dataBlock.get ( "atom_site", None )
if table is not None:
# . Disorder and multiplicity information.
assemblies = table.ColumnValues ( "atom_site_disorder_assembly" )
groups = table.ColumnValues ( "atom_site_disorder_group" )
multiplicities = table.ColumnValues ( "atom_site_symmetry_multiplicity" )
# . Check for the disorder groups to include.
if groups is not None:
uniqueGroups = set ( groups )
uniqueGroups.discard ( disorderGroup )
uniqueGroups.discard ( "-" + disorderGroup )
uniqueGroups.discard ( _UndefinedCharacter )
if len ( uniqueGroups ) > 0:
toInclude = set ( [ _UndefinedCharacter, disorderGroup, "-" + disorderGroup ] )
indices = []
for ( i, group ) in enumerate ( groups ):
if group in toInclude: indices.append ( i )
if len ( indices ) < len ( groups ):
result = system.Prune ( Selection ( indices ) )
result.label = system.label
return result
def RadialDistributionFunction(*arguments, **keywordArguments):
"""Calculate a radial distribution function."""
# . Get the trajectory and associated system data.
(system, trajectories) = _GetSystemAndTrajectoriesFromArguments(*arguments)
# . Keyword arguments.
bins = keywordArguments.pop("bins", 100)
log = keywordArguments.pop("log", logFile)
safety = keywordArguments.pop("safety", _DEFAULTSAFETY)
selection1 = keywordArguments.pop("selection1", None)
selection2 = keywordArguments.pop("selection2", None)
upper = keywordArguments.pop("maximumR", None)
if selection1 is None:
selection1 = Selection.FromIterable(range(len(system.atoms)))
if selection2 is None: selection2 = selection1
_CheckForUnknownOptions(keywordArguments)
# . Get the numbers of particles.
np1 = len(selection1)
np2 = len(selection2)
# . Check for a cubic system.
try:
cc = system.symmetry.crystalClass
if not isinstance(cc, CrystalClassCubic): raise
except:
raise ValueError("System does not have cubic symmetry.")
# . Estimate an upper bound.
if upper is None:
try:
upper = (system.symmetryParameters.a - safety) / 2.0
except:
raise ValueError(
"Please supply an upper bound for the RDF calculation.")
# . Initialization.
lower = 0.0
distances = []
histogram = [0 for i in range(bins)]
rdf = []
# . Calculate the width of each bin.
width = (upper - lower) / float(bins)
vacc = 0.0
# . Loop over trajectory frames.
numberFrames = 0
for trajectory in trajectories:
trajectory.ReadHeader()
while trajectory.RestoreOwnerData():
# . Get the frame.
frame = system.coordinates3
numberFrames += 1
# . Accumulate the volume.
a = system.symmetryParameters.a
vacc += a**3
# . Check a.
if upper > 0.5 * a:
raise ValueError(
"Box does not satisfy minimum image convention.")
# . Bin the distances.
# . This loop involves duplicate work for self rdfs.
for i in selection1:
for j in selection2:
if i != j:
dr = frame.Displacement(i, j)
for c in range(3):
x = a * round(dr[c] / a)
dr[c] -= x
r = dr.Norm2()
if (r >= lower) and (r < upper):
b = int((r - lower) / width)
histogram[b] += 1
# . Finish up.
trajectory.ReadFooter()
trajectory.Close()
# . Calculate g(r).
fact = 4.0 * math.pi * float(np1 * np2 * numberFrames**2) / (3.0 * vacc)
for i in range(bins):
rlower = lower + float(i) * width
rupper = rlower + width
distances.append(rlower + 0.5 * width)
rdf.append(float(histogram[i]) / (fact * (rupper**3 - rlower**3)))
# . Output the results.
if LogFileActive(log):
table = log.GetTable(columns=[20, 20])
table.Start()
table.Title("Radial Distribution Function")
table.Heading("Distance")
table.Heading("g(r)")
for (r, g) in zip(distances, rdf):
table.Entry("{:20.4f}".format(r))
table.Entry("{:20.4f}".format(g))
table.Stop()
# . Return results.
return (distances, rdf)
def SelfDiffusionFunction(*arguments, **keywordArguments):
"""Calculate the self diffusion function."""
# . Get the trajectory and associated system data.
(system, trajectories) = _GetSystemAndTrajectoriesFromArguments(*arguments)
# . Keyword arguments.
log = keywordArguments.pop("log", logFile)
maximumTime = keywordArguments.pop("maximumTime", None)
selection = keywordArguments.pop("selection", None)
timeStep = keywordArguments.pop("timeStep", 1.0)
if selection is None:
selection = Selection.FromIterable(range(len(system.atoms)))
_CheckForUnknownOptions(keywordArguments)
# . Initialization.
np = len(selection) # . The number of particles.
dSelf = []
frames = []
times = []
# . Loop over trajectory frames.
for trajectory in trajectories:
trajectory.ReadHeader()
while trajectory.RestoreOwnerData():
frames.append(system.coordinates3.Prune(selection))
trajectory.ReadFooter()
trajectory.Close()
# . Get the number of frames and tStop.
numberFrames = len(frames)
if maximumTime is None:
tStop = numberFrames - 1
else:
tStop = int(maximumTime / timeStep)
tStop = min(numberFrames - 1, tStop)
# . Calculate the function - slow version.
# . Loop over time differences to calculate.
for t in range(tStop + 1):
# . Initialization.
tmax = numberFrames - t
total = 0.0
# . Loop over allowed increments.
for t0 in range(tmax):
# . Calculate differences.
fa = frames[t0 + t]
fb = frames[t0]
for i in range(np):
total += (fa[i, 0] - fb[i, 0])**2 + (
fa[i, 1] - fb[i, 1])**2 + (fa[i, 2] - fb[i, 2])**2
# . Calculate dSelf.
dSelf.append(total / float(3 * np * tmax))
times.append(float(t) * timeStep)
# . Output the results.
if LogFileActive(log):
table = log.GetTable(columns=[20, 20])
table.Start()
table.Title("Self-Diffusion Function")
table.Heading("Time")
table.Heading("Dself")
for (t, d) in zip(times, dSelf):
table.Entry("{:20.4f}".format(t))
table.Entry("{:20.4f}".format(d))
table.Stop()
# . Return results.
return (times, dSelf)
"P61" : [ "(x,y,z)", "(-y,x-y,z+1/3)", "(-x+y,-x,z+2/3)", "(-x,-y,z+1/2)", "(y,-x+y,z+5/6)", "(x-y,x,z+1/6)" ],
"P21c" : [ "(x,y,z)", "(-x,y+1/2,-z+1/2)", "(-x,-y,-z)", "(x,-y+1/2,z+1/2)" ],
"P21a" : [ "(x,y,z)", "(-x+1/2,y+1/2,-z)", "(-x,-y,-z)", "(x+1/2,-y+1/2,z)" ],
"R3" : [ "(x,y,z)", "(z,x,y)", "(y,z,x)" ] }
# . Convert to transformation sets.
_transformationSets = {}
for ( key, olist ) in _operations.iteritems ( ):
tset = []
for o in olist:
tset.append ( Transformation3_FromSymmetryOperationString ( o ) )
_transformationSets[key] = Transformation3Container.WithTransformations ( tset )
# . Molecule definitions.
_keywordLabels = ( "label", "canQCOptimize", "qcSelection", "qcCharge", "vacuumEnergy", "crystalEnergy", "crystalClass", "transformations", "crystalParameters" )
_moleculeData = ( ( "ALAALA", False, Selection.FromIterable ( range ( 6, 10 ) ), 0, -178.7095, -677.7298, CrystalClassTetragonal ( ), _transformationSets["I4"], { "a" : 17.9850, "c" : 5.1540 } ),
( "ALAMET01", False, Selection.FromIterable ( range ( 16, 27 ) ), 0, -135.0084, -652.9681, CrystalClassMonoclinic ( ), _transformationSets["P21c"], { "a" : 13.089, "b" : 5.329, "c" : 15.921, "beta" : 108.57 } ),
( "AQARUF", False, Selection.FromIterable ( range ( 6, 19 ) ), 0, -144.5558, -608.3551, CrystalClassHexagonal ( ), _transformationSets["P61"], { "a" : 14.3720, "c" : 9.8282 } ),
( "BEVXEF01", False, Selection.FromIterable ( range ( 23, 29 ) ), 0, -240.0604, -878.7555, CrystalClassOrthorhombic ( ), _transformationSets["P212121"], { "a" : 9.6590, "b" : 9.6720, "c" : 10.7390 } ),
( "GLYALB", False, Selection.FromIterable ( range ( 13, 17 ) ), 0, -44.8402, -562.9905, CrystalClassOrthorhombic ( ), _transformationSets["P212121"], { "a" : 9.6930, "b" : 9.5240, "c" : 7.5370 } ),
( "GLYGLY", False, Selection.FromIterable ( range ( 14, 17 ) ), -1, -184.8863, -687.4449, CrystalClassMonoclinic ( ), _transformationSets["P21a"], { "a" : 7.812, "b" : 9.566, "c" : 9.410, "beta" : 124.60 } ),
( "GUFQON", False, Selection.FromIterable ( range ( 13, 18 ) ), 0, -191.1490, -511.8117, CrystalClassOrthorhombic ( ), _transformationSets["P212121"], { "a" : 7.2750, "b" : 9.0970, "c" : 10.5070 } ),
( "HXACAN19", True, Selection.FromIterable ( range ( 16, 20 ) ), 0, 157.7170, 24.6588, CrystalClassMonoclinic ( ), _transformationSets["P21a"], { "a" : 12.8720, "b" : 9.3700, "c" : 7.0850, "beta" : 115.6200 } ),
( "IWANID", False, Selection.FromIterable ( range ( 37, 51 ) ), 0, 4380.9282, 4070.8472, CrystalClassMonoclinic ( ), _transformationSets["C2"], { "a" : 23.091, "b" : 5.494, "c" : 17.510, "beta" : 117.88 } ),
( "LCDMPP10", True, Selection.FromIterable ( range ( 4, 8 ) ), 0, 157.3277, 40.3629, CrystalClassTriclinic ( ), _transformationSets["P1"], { "a" : 8.067, "b" : 6.082, "c" : 5.155, "alpha" : 131.7, "beta" : 82.4, "gamma" : 106.6 } ),
( "WIRYEB", False, Selection.FromIterable ( range ( 6, 16 ) ), 0, -155.7355, -612.6186, CrystalClassHexagonal ( ), _transformationSets["P61"], { "a" : 14.4240, "c" : 9.9960 } ),
( "WABZOO", True, Selection.FromIterable ( range ( 0, 4 ) + range ( 10, 14 ) + range ( 18, 25 ) ), 0, 209.9697, 152.9967, CrystalClassRhombohedral ( ), _transformationSets["R3"], { "a" : 12.5940 , "alpha" : 118.0300 } ) )
# . Options for expanding to P1 symmetry.
_defaultRange = range ( 1 ) #range ( -1, 2 )
_aRange = _defaultRange
def Within ( self, distance, excludeSelf = False ):
"""Selection of atoms within a given distance."""
# . Find all atoms within distance of the current selection.
selfSelection = self.selection
system = self.system
pairlist = CrossPairList_FromSingleCoordinates3 ( system.coordinates3, selection1 = Selection.FromIterable ( selfSelection ), safety = distance )
selection = set ( selfSelection )
for ( i, j ) in pairlist: selection.add ( j )
# . Exclude self?
if excludeSelf: selection -= self.selection
# . Finish up.
return self.__class__ ( selection = selection, system = self.system )
# takes no (interesting) arguments.
#
# . Note on scratch names:
#
# It has been noticed that ORCA itself can give an error when the name of the scratch directory is too long.
# This occurs in the "%pcname" line of the ORCA input file. To cure this use a shorter name - either by resetting
# the environment variable PDYNAMO_SCRATCH or by explicitly passing a name to the model with the "scratch" option.
#
# . Define the MM, NB and QC models.
mmModel = MMModelOPLS("bookSmallExamples")
nbModel = NBModelORCA()
qcModel = QCModelORCA("MP2:6-31G*", "EXTREMESCF", "SCFCONV10")
# . Define the molecule.
molecule = MOLFile_ToSystem(
os.path.join(os.getenv("PDYNAMO_PMOLECULE"), "data", "mol",
"waterDimer_cs.mol"))
# . Define the selection for the first molecule.
firstWater = Selection.FromIterable([0, 1, 2])
# . Define the energy model.
molecule.DefineMMModel(mmModel)
molecule.DefineQCModel(qcModel, qcSelection=firstWater)
molecule.DefineNBModel(nbModel)
molecule.Summary()
# . Calculate an energy.
molecule.Energy(doGradients=True)
def runTest(self):
"""The test."""
# . Initialization.
dataPath = os.path.join(os.getenv("PDYNAMO_PMOLECULE"), "data", "mol")
log = self.GetLog()
translation = Vector3.Uninitialized()
# . Get the individual systems.
energies = []
molecules = []
for (i, label) in enumerate(_Molecules):
molecule = MOLFile_ToSystem(os.path.join(dataPath, label + ".mol"))
molecule.label = label
molecule.DefineMMModel(_mmModel)
molecule.DefineNBModel(_nbModel)
molecule.Summary(log=log)
molecule.coordinates3.TranslateToCenter()
molecule.configuration.Clear()
energies.append(molecule.Energy(log=log, doGradients=True))
molecules.append(molecule)
# . Data initialization.
observed = {}
referenceData = TestDataSet("Merge/Prune Energies")
# . Loop over the tests.
for (testIndex, (moleculeFrequencies,
moleculePruneIndices)) in enumerate(_Tests):
# . Heading.
if log is not None:
log.Heading("Merge/Prune Test {:d}".format(testIndex),
QBLANKLINE=True)
# . Initialization.
mergedEnergy = 0.0
prunedEnergy = 0.0
translation.Set(0.0)
# . Gather items.
index = 0
numberAtoms = 0
pruneIndices = []
toMerge = []
for (i, frequency) in enumerate(moleculeFrequencies):
molecule = molecules[i]
mergedEnergy += energies[i] * frequency
for f in range(frequency):
cloned = Clone(molecule)
translation[0] += _Displacement
cloned.coordinates3.Translate(translation)
toMerge.append(cloned)
if index in moleculePruneIndices:
pruneIndices.extend(
range(numberAtoms,
numberAtoms + len(cloned.atoms)))
prunedEnergy += energies[i]
index += 1
numberAtoms += len(cloned.atoms)
# . Merging.
merged = toMerge[0].Merge(toMerge[1:])
merged.Summary(log=log)
eMerged = merged.Energy(log=log)
# . Pruning.
pruned = merged.Prune(Selection.FromIterable(pruneIndices))
pruned.Summary(log=log)
ePruned = pruned.Energy(log=log)
# . Get the observed and reference data.
for (tag, eObserved,
eReference) in (("Merged Energy {:d}".format(testIndex),
eMerged, mergedEnergy),
("Pruned Energy {:d}".format(testIndex),
ePruned, prunedEnergy)):
observed[tag] = eObserved
referenceData.AddDatum(
TestReal(
tag,
eReference,
referenceData,
absoluteErrorTolerance=_EnergyAbsoluteErrorTolerance,
toleranceFormat="{:.3f}",
valueFormat="{:.3f}"))
# . Finish up.
if log is not None: log.Separator()
# . Check for success/failure.
if len(observed) > 0:
results = referenceData.VerifyAgainst(observed)
results.Summary(log=log, fullSummary=self.fullVerificationSummary)
isOK = results.WasSuccessful()
else:
isOK = True
# . Success/failure.
self.assertTrue(isOK)
def runTest(self):
"""The test."""
# . Output setup.
dataPath = os.path.join(os.getenv("PDYNAMO_PMOLECULE"), "data", "mol")
log = self.GetLog()
# . Define the MM, NB and QC models.
mmModel = MMModelOPLS("bookSmallExamples")
nbModel = NBModelFull()
qcModel = QCModelMNDO()
# . Define the dimer with an MM model.
dimer = MOLFile_ToSystem(os.path.join(dataPath, "waterDimer_cs.mol"))
dimer.DefineMMModel(mmModel)
dimer.Summary(log=log)
# . Define the monomer selections.
selection1 = Selection.FromIterable(range(0, 3))
selection2 = Selection.FromIterable(range(3, 6))
# . Get the monomer energies.
e1 = self.MonomerEnergies(dimer, selection1, nbModel, qcModel, log=log)
e2 = self.MonomerEnergies(dimer, selection2, nbModel, qcModel, log=log)
# . Get the binding energies.
e12 = {}
for model1 in _Models:
for model2 in _Models:
key = model1 + " " + model2
if log is not None:
log.Heading(model1 + "/" + model2 + " Dimer Calculation",
QBLANKLINE=True)
# . Define the energy model.
if key == "QC QC": dimer.DefineQCModel(qcModel)
elif key == "QC MM":
dimer.DefineQCModel(qcModel, qcSelection=selection1)
elif key == "MM QC":
dimer.DefineQCModel(qcModel, qcSelection=selection2)
else:
dimer.energyModel.ClearQCModel(dimer.configuration)
if "MM" in key: dimer.DefineNBModel(nbModel)
dimer.Summary(log=log)
# . Store the results.
e12[key] = dimer.Energy(log=log) - e1[model1] - e2[model2]
# . Output the results.
if log is not None:
keys = e12.keys()
keys.sort()
table = log.GetTable(columns=[20, 20, 20])
table.Start()
table.Title("Water Dimer Binding Energies")
table.Heading("Monomer 1")
table.Heading("Monomer 2")
table.Heading("Binding Energy")
for key in keys:
(model1, model2) = key.split()
table.Entry(model1)
table.Entry(model2)
table.Entry("{:.1f}".format(e12[key]))
table.Stop()
# . Success/failure.
isOK = True
for e in e12.values():
if (e < _LowerBound) or (e > _UpperBound):
isOK = False
break
self.assertTrue(isOK)
def runTest ( self ):
"""The test."""
# . Initialization.
failures = 0
otherFailures = 0
successes = 0
# . Paths.
dataPath = os.path.join ( os.getenv ( "PDYNAMO_PMOLECULE" ), "data", "pdb" )
if self.resultPath is None: outPath = os.path.join ( os.getenv ( "PDYNAMO_SCRATCH" ), _Destination )
else: outPath = os.path.join ( self.resultPath, _Destination )
if not os.path.exists ( outPath ): os.mkdir ( outPath )
log = self.GetLog ( )
# . Models.
mmModel = MMModelCHARMM ( "c36a2" )
nbModel = NBModelABFS ( )
qcModel = QCModelMNDO ( )
# . Get the file.
pdbFile = os.path.join ( dataPath, "2E4E_folded_solvated.pdb" )
( head, tail ) = os.path.split ( pdbFile )
tag = tail[0:-4]
if log is not None: log.Text ( "\nProcessing " + pdbFile + ":\n" )
system = PDBFile_ToSystem ( pdbFile, log = log, useComponentLibrary = True )
try:
# . Fixed atoms.
fixedAtoms = Selection ( ~ AtomSelection.FromAtomPattern ( system, "A:*:*" ) )
# . QC selection.
indices = set ( )
for atomTag in _Tags:
indices.add ( system.sequence.AtomIndex ( "A:TYR.2:" + atomTag ) )
tyrosine = Selection ( indices )
# . Setup.
system.electronicState = ElectronicState ( charge = 0, multiplicity = 1 )
system.DefineFixedAtoms ( fixedAtoms )
system.DefineSymmetry ( crystalClass = CrystalClassCubic ( ), a = _BoxSize )
system.DefineMMModel ( mmModel, log = log )
system.DefineQCModel ( qcModel, qcSelection = tyrosine )
system.DefineNBModel ( nbModel )
system.Summary ( log = log )
referenceEnergy = system.Energy ( log = log, doGradients = True )
# . Pickling.
pklFile = os.path.join ( outPath, tag + ".pkl" )
yamlFile = os.path.join ( outPath, tag + ".yaml" )
Pickle ( pklFile , system )
YAMLPickle ( yamlFile, system )
# . Unpickling.
pklSystem = Unpickle ( pklFile )
pklSystem.label += " (Pickled)"
pklSystem.Summary ( log = log )
pklEnergy = pklSystem.Energy ( log = log, doGradients = True )
if math.fabs ( referenceEnergy - pklEnergy <= _Tolerance ): successes += 1
else: failures += 1
yamlSystem = YAMLUnpickle ( yamlFile )
yamlSystem.label += " (YAMLPickled)"
yamlSystem.Summary ( log = log )
yamlEnergy = yamlSystem.Energy ( log = log, doGradients = True )
if math.fabs ( referenceEnergy - yamlEnergy <= _Tolerance ): successes += 1
else: failures += 1
except Exception as e:
otherFailures += 1
if log is not None: log.Text ( "\nError occurred> " + e.args[0] + "\n" )
# . Summary of results.
if log is not None:
summary = log.GetSummary ( )
summary.Start ( "Pickle Tests" )
summary.Entry ( "Pickle Successes", "{:d}".format ( successes ) )
summary.Entry ( "Pickle Failures" , "{:d}".format ( failures ) )
summary.Entry ( "Total Tests" , "2" )
summary.Entry ( "Loop Failures" , "{:d}".format ( otherFailures ) )
summary.Stop ( )
# . Success/failure.
self.assertTrue ( ( failures == 0 ) and ( otherFailures == 0 ) )
def SolvateSystemBySuperposition ( solute, solvent, log = logFile, excludeHydrogens = True, reorientSolute = True, printPairs = False, scaleradii = 0.75 ):
"""Solvate a system by superposition."""
# . Check that the solvent has a full connectivity.
if not solvent.connectivity.HasFullConnectivity ( ): raise ValueError ( "The solvent must have a full connectivity." )
# . Create a sequence.
if solute.sequence is not None:
entityLabel = DetermineUniqueEntityLabel ( solute, label = "W" )
CreateHomogeneousIsolateSequence ( solvent, entityLabel = entityLabel )
# . Merge the two systems.
solution = MergeByAtom ( solute, solvent )
# . Get the atom masses and selections corresponding to the solute and solvent atoms.
masses = solution.atoms.GetItemAttributes ( "mass" )
nsolute = len ( solute.atoms )
nsolvent = len ( solvent.atoms )
soluteatoms = Selection.FromIterable ( range ( nsolute ) )
solventatoms = Selection.FromIterable ( range ( nsolute, nsolute + nsolvent ) )
# . Reorient the solute coordinates if required.
if reorientSolute: solution.coordinates3.ToPrincipalAxes ( selection = soluteatoms, weights = masses )
# . Check the extents of the solute and solvent - to ensure the box is big enough!
( origin1, extents1 ) = solution.coordinates3.EnclosingOrthorhombicBox ( selection = soluteatoms )
( origin2, extents2 ) = solution.coordinates3.EnclosingOrthorhombicBox ( selection = solventatoms )
extents2.AddScaledVector3 ( -1.0, extents1 )
if min ( extents2 ) < 0.0: raise ValueError ( "It is likely that the solvent box is too small for the solute." )
# . Move the center of the solute atoms to that of the solvent atoms.
translation = Clone ( origin2 )
translation.AddScaledVector3 ( 0.5, extents2 )
# translation.AddScaledVector3 ( -0.5, extents1 ) # . Not needed as done above.
translation.AddScaledVector3 ( -1.0, origin1 )
solution.coordinates3.Translate ( translation, selection = soluteatoms )
# . Reduce the selections if hydrogens are to be excluded.
if excludeHydrogens:
indices = []
for i in soluteatoms:
if solution.atoms[i].atomicNumber != 1: indices.append ( i )
soluteatoms = Selection.FromIterable ( indices )
indices = []
for i in solventatoms:
if solution.atoms[i].atomicNumber != 1: indices.append ( i )
solventatoms = Selection.FromIterable ( indices )
# . Get the radii.
radii = solution.atoms.GetItemAttributes ( "vdwRadius" )
radii.Scale ( scaleradii )
# . Get the pairlist.
pairlist = CrossPairList_FromSingleCoordinates3 ( solution.coordinates3, selection1 = solventatoms, selection2 = soluteatoms, radii = radii )
npairs = len ( pairlist )
# . Find the solvent atoms in the pairlist (which are the first indices in the list).
indices = set ( )
for ( i, j ) in pairlist: indices.add ( i )
# . Now find the indices of all the atoms in the corresponding solvent isolates.
if len ( indices ) > 0:
toremove = solution.connectivity.isolates.GetAllIndices ( Selection.FromIterable ( indices ) )
ntoremove = len ( toremove )
# . Remove unwanted atoms.
reduced = PruneByAtom ( solution, toremove.Complement ( upperBound = nsolute + nsolvent ) )
if solution.sequence is not None: RenumberEntityComponents ( reduced, entityLabels = [ entityLabel ] )
else:
ntoremove = 0
reduced = solution
# . Set the symmetry of solution by copying that of solvent.
if ( solvent.symmetry is not None ) and ( solvent.symmetryParameters is not None ):
keywordArguments = solvent.symmetryParameters.__getstate__ ( )
keywordArguments["crystalClass"] = solvent.symmetry.crystalClass
keywordArguments["transformations"] = solvent.symmetry.transformations
reduced.DefineSymmetry ( **keywordArguments )
# . Do some printing.
if LogFileActive ( log ):
# . Distances.
if printPairs:
table = log.GetTable ( columns = [ 10, 10, 20, 20 ] )
table.Start ( )
table.Title ( "Solute/Solvent Pairs" )
table.Heading ( "Solvent" )
table.Heading ( "Solute" )
table.Heading ( "Distance" )
table.Heading ( "Cutoff" )
for ( i, j ) in pairlist:
table.Entry ( PeriodicTable.Symbol ( solution.atoms[i].atomicNumber, index = i ) )
table.Entry ( PeriodicTable.Symbol ( solution.atoms[j].atomicNumber, index = j ) )
table.Entry ( "{:.3f}".format ( solution.coordinates3.Distance ( i, j ) ) )
table.Entry ( "{:.3f}".format ( radii[i] + radii[j] ) )
table.Stop ( )
# . Summary.
summary = log.GetSummary ( )
summary.Start ( "Solvation By Superposition Summary" )
summary.Entry ( "Solute Atoms" , "{:d}".format ( nsolute ) )
summary.Entry ( "Solvent Atoms" , "{:d}".format ( nsolvent - ntoremove ) )
summary.Entry ( "Atoms Removed" , "{:d}".format ( ntoremove ) )
summary.Entry ( "Solute/Solvent Pairs" , "{:d}".format ( npairs ) )
summary.Stop ( )
# . Finish up.
return reduced
#===================================================================================================================================
# . Parameters for system definitions.
#===================================================================================================================================
# . Model definitions.
_converger = DIISSCFConverger(densityTolerance=1.0e-8, maximumSCFCycles=250)
_qcModelDFT = QCModelDFT(converger=_converger,
densityBasis="demon",
orbitalBasis="321g")
_qcModelMNDO = QCModelMNDO(converger=_converger)
_qcModelORCA = QCModelORCA("HF:6-31G*", "SCFCONV10", "EXTREMESCF")
_nbModel = NBModelABFS()
# . Job data.
# . Options: doQCMM for bottom layer, QC model for upper layer and QC selection for upper layer.
_jobData = { "Water Dimer 1" : ( ( False, _qcModelDFT, Selection.FromIterable ( range ( 3 ) ) ), \
( False, _qcModelORCA, Selection.FromIterable ( range ( 3, 6 ) ) ), \
( True, _qcModelDFT, Selection.FromIterable ( range ( 3 ) ) ) ), \
"Water Dimer 2" : ( ( True, _qcModelORCA, Selection.FromIterable ( range ( 3, 6 ) ) ), ), \
"Cyclohexane 9" : ( ( False, _qcModelDFT, Selection.FromIterable ( range ( 6 ) ) ), \
( True, _qcModelORCA, Selection.FromIterable ( range ( 3, 6 ) ) ) ), \
"Alanine Dipeptide" : ( ( False, _qcModelDFT, Selection.FromIterable ( range ( 10, 14 ) ) ), \
( False, _qcModelORCA, Selection.FromIterable ( range ( 10, 14 ) ) ), \
( True, _qcModelDFT, Selection.FromIterable ( range ( 10, 14 ) ) ), \
( True, _qcModelORCA, Selection.FromIterable ( range ( 10, 14 ) ) ) ) }
#===================================================================================================================================
# . Parameters for test.
#===================================================================================================================================
# . Tolerances.
_EnergyTolerance = 0.1
def WriteJobFiles(self, log=logFile):
"""Write files: PQR, FPT, OGM and MGM."""
if self.isInitialized:
# . Get atomic charges and radii for the system
system = self.owner
systemCharges = system.AtomicCharges()
systemRadii = []
systemTypes = system.energyModel.mmAtoms.AtomTypes()
radii = YAMLUnpickle("%s/%s" % (YAMLPATHIN, "radii.yaml"))
for atomType in systemTypes:
if radii.has_key(atomType):
radius = radii[atomType]
else:
generalAtomType = "%s*" % atomType[0]
if radii.has_key(generalAtomType):
radius = radii[generalAtomType]
else:
raise ContinuumElectrostaticsError(
"Cannot find atomic radius for atom type %s" %
atomType)
systemRadii.append(radius)
# . Prepare scratch space
if not os.path.exists(self.pathScratch):
try:
os.makedirs(self.pathScratch)
except:
raise ContinuumElectrostaticsError(
"Cannot create scratch directory %s" %
self.pathScratch)
# . Create subdirectories, if necessary
if self.splitToDirectories:
for site in self.sites:
sitePqr = site.instances[0].sitePqr
directory = os.path.dirname(sitePqr)
if not os.path.exists(directory):
try:
os.makedirs(directory)
except:
raise ContinuumElectrostaticsError(
"Cannot create directory %s" % directory)
# . Write PQR, OGM and MGM files of all instances of all sites
for site in self.sites:
site._WriteMEADFiles(system, systemCharges, systemRadii)
# . Write background PQR file
PQRFile_FromSystem(self.pathPqrBack,
system,
selection=Selection(self.backAtomIndices),
charges=systemCharges,
radii=systemRadii)
# . Write full-protein PQR file (to be used as eps2set_region)
PQRFile_FromSystem(self.pathPqrProtein,
system,
selection=Selection(self.proteinAtomIndices),
charges=systemCharges,
radii=systemRadii)
# . Write FPT-file
lines = []
for siteIndex, site in enumerate(self.sites):
for instanceIndex, instance in enumerate(site.instances):
for atomIndex, charge in zip(site.siteAtomIndices,
instance.charges):
x, y, z = system.coordinates3[atomIndex]
line = "%d %d %f %f %f %f\n" % (
siteIndex, instanceIndex, x, y, z, charge)
lines.append(line)
WriteInputFile(self.pathFptSites, lines)
self.isFilesWritten = True
import math, os.path
from pBabel import MOLFile_ToSystem
from pCore import logFile, LogFileActive, Selection
from pMolecule import ElectronicState, MMModelOPLS, NBModelFull
#===================================================================================================================================
# . Parameters for system definitions.
#===================================================================================================================================
# . Paths.
_dataPath = os.path.join(os.getenv("PDYNAMO_PMOLECULE"), "data", "mol")
# . Molecule definitions.
_keywordLabels = ("label", "dataPath", "fileName", "qcCharge", "multiplicity",
"qcSelection")
_moleculeData = ( ( "Alanine Dipeptide" , _dataPath, "bAla_c7eq" , 0, 1, Selection.FromIterable ( range ( 10, 14 ) ) ), \
( "Cyclohexane 6" , _dataPath, "cyclohexane" , 0, 1, Selection.FromIterable ( range ( 6 ) ) ), \
( "Cyclohexane 9" , _dataPath, "cyclohexane" , 0, 1, Selection.FromIterable ( range ( 9 ) ) ), \
( "Tyrosine Dipeptide 1", _dataPath, "tyrosineDipeptide", 0, 1, Selection.FromIterable ( range ( 6, 14 ) + range ( 22, 29 ) ) ), \
( "Tyrosine Dipeptide 2", _dataPath, "tyrosineDipeptide", 1, 2, Selection.FromIterable ( range ( 6, 14 ) + range ( 22, 29 ) ) ), \
( "Water Dimer 1" , _dataPath, "waterDimer_cs" , 0, 1, Selection.FromIterable ( range ( 3 ) ) ), \
( "Water Dimer 2" , _dataPath, "waterDimer_cs" , 0, 1, Selection.FromIterable ( range ( 3, 6 ) ) ) )
#===================================================================================================================================
# . Class for a QC/MM test system.
#===================================================================================================================================
class QCMMTestSystem(object):
"""QC/MM test system."""
def __init__(self, **kwargs):
"""Constructor."""
solution.DefineNBModel ( nbModel )
solution.Summary ( )
# . Refinement.
if _Refine:
# . Check energies.
solute.Energy ( )
for system in ( solvent, solution ):
system.DefineNBModel ( nbModel )
system.Energy ( )
# . Get selections for the protein atoms in the A and I chains.
protein = AtomSelection.FromAtomPattern ( solution, "A:*:*" ) | AtomSelection.FromAtomPattern ( solution, "I:*:*" )
hydrogens = AtomSelection.FromAtomAttributes ( solution, "atomicNumber", 1 )
heavies = Selection.FromIterable ( protein - hydrogens )
protein = Selection.FromIterable ( protein )
# . Fix all protein atoms.
solution.DefineFixedAtoms ( protein )
solution.Summary ( )
# . Optimization.
if _Optimize:
ConjugateGradientMinimize_SystemGeometry ( solution ,
maximumIterations = 200 ,
logFrequency = 10 ,
rmsGradientTolerance = 10.0 )
# . Define a normal deviate generator in a given state.
normalDeviateGenerator = NormalDeviateGenerator.WithRandomNumberGenerator ( RandomNumberGenerator.WithSeed ( 517152 ) )
def CoordinateFluctuations(*arguments, **keywordArguments):
"""Calculate the coordinate fluctuations for selected particles."""
# . Initialization.
fluctuations = None
# . Get the trajectory and associated system data.
(system, trajectories) = _GetSystemAndTrajectoriesFromArguments(*arguments)
# . Get the selection and the size of the problem.
selection = keywordArguments.pop("selection", None)
if selection is None:
selection = Selection.FromIterable(range(len(system.atoms)))
n = len(selection)
# . Get the average positions.
averagePositions = keywordArguments.pop("averagePositions", None)
if averagePositions is None:
averagePositions = AveragePositions(trajectories, selection=selection)
# . Various other options.
anisotropic = keywordArguments.pop("anisotropic", False)
asBFactors = keywordArguments.pop("asBFactors", False)
_CheckForUnknownOptions(keywordArguments)
# . Continue processing.
if (n > 0) and (averagePositions is not None):
# . Allocate space.
displacement = Coordinates3.WithExtent(n)
if anisotropic: fluctuations = Real2DArray.WithExtents(n, 6)
else: fluctuations = Real1DArray.WithExtent(n)
displacement.Set(0.0)
fluctuations.Set(0.0)
# . Loop over trajectory frames.
numberFrames = 0
for trajectory in trajectories:
trajectory.ReadHeader()
while trajectory.RestoreOwnerData():
frame = system.coordinates3
if anisotropic:
for (p, i) in enumerate(selection):
dx = frame[i, 0] - averagePositions[p, 0]
dy = frame[i, 1] - averagePositions[p, 1]
dz = frame[i, 2] - averagePositions[p, 2]
fluctuations[p, 0] += dx * dx
fluctuations[p, 1] += dy * dx
fluctuations[p, 2] += dy * dy
fluctuations[p, 3] += dz * dx
fluctuations[p, 4] += dz * dy
fluctuations[p, 5] += dz * dz
else:
for (p, i) in enumerate(selection):
fluctuations[p] += ( ( frame[i,0] - averagePositions[p,0] )**2 + \
( frame[i,1] - averagePositions[p,1] )**2 + \
( frame[i,2] - averagePositions[p,2] )**2 )
trajectory.ReadFooter()
trajectory.Close()
numberFrames += len(trajectory)
# . Scale.
if numberFrames > 0: fluctuations.Scale(1.0 / float(numberFrames))
# . Convert to B-factors if necessary.
if asBFactors:
conversionFactor = 8.0 * math.pi**2
if not anisotropic: conversionFactor /= 3.0
fluctuations.Scale(conversionFactor)
# . Finish up.
return fluctuations
def BuildCubicSolventBox ( molecule, nmolecules, log = logFile, moleculesize = None, excludeHydrogens = True, QRANDOMROTATION = True, randomNumberGenerator = None, scalesafety = 1.1 ):
"""Build a cubic solvent box."""
# . Get the number of molecules in each direction.
nlinear = int ( math.ceil ( math.pow ( float ( nmolecules ), 1.0 / 3.0 ) ) )
# . Get the indices of the occupied sites.
sites = sample ( range ( nlinear**3 ), nmolecules )
sites.sort ( )
# . Get the number of atoms in the molecule and an appropriate selection.
natoms = len ( molecule.atoms )
selection = Selection.FromIterable ( range ( natoms ) )
# . Get a copy of molecule's coordinates (reorientated).
coordinates3 = Clone ( molecule.coordinates3 )
coordinates3.ToPrincipalAxes ( )
# . Get the molecule size depending upon the input options.
# . A molecule size has been specified.
if moleculesize is not None:
size = moleculesize
# . Determine the size of the molecule as the diagonal distance across its enclosing orthorhombic box.
else:
radii = molecule.atoms.GetItemAttributes ( "vdwRadius" )
if excludeHydrogens:
atomicNumbers = molecule.atoms.GetItemAttributes ( "atomicNumber" )
for ( i, atomicNumber ) in enumerate ( molecule.atoms.GetItemAttributes ( "atomicNumber" ) ):
if atomicNumber == 1: radii[i] = 0.0
( origin, extents ) = coordinates3.EnclosingOrthorhombicBox ( radii = radii )
size = extents.Norm2 ( ) * scalesafety
# . Create the new system - temporarily resetting the coordinates.
temporary3 = molecule.coordinates3
molecule.coordinates3 = coordinates3
solvent = MergeByAtom ( nmolecules * [ molecule ] )
molecule.coordinates3 = temporary3
# . Set the system symmetry.
solvent.DefineSymmetry ( crystalClass = CrystalClassCubic ( ), a = size * float ( nlinear ) )
# . Set up for random rotations.
if QRANDOMROTATION:
if randomNumberGenerator is None: randomNumberGenerator = RandomNumberGenerator.WithRandomSeed ( )
rotation = Matrix33.Null ( )
# . Loop over the box sites.
origin = 0.5 * float ( 1 - nlinear ) * size
n = 0
translation = Vector3.Null ( )
for i in range ( nlinear ):
translation[0] = origin + size * float ( i )
for j in range ( nlinear ):
translation[1] = origin + size * float ( j )
for k in range ( nlinear ):
if len ( sites ) == 0: break
translation[2] = origin + size * float ( k )
# . Check for an occupied site.
if sites[0] == n:
sites.pop ( 0 )
# . Randomly rotate the coordinates.
if QRANDOMROTATION:
rotation.RandomRotation ( randomNumberGenerator )
solvent.coordinates3.Rotate ( rotation, selection = selection )
# . Translate the coordinates.
solvent.coordinates3.Translate ( translation, selection = selection )
# . Increment the selection for the next molecule.
selection.Increment ( natoms )
n += 1
# . Do some printing.
if LogFileActive ( log ):
summary = log.GetSummary ( )
summary.Start ( "Cubic Solvent Box Summary" )
summary.Entry ( "Number of Molecules", "{:d}" .format ( nmolecules ) )
summary.Entry ( "Density (kg m^-3)", "{:.3f}".format ( SystemDensity ( solvent ) ) )
summary.Entry ( "Box Side", "{:.3f}".format ( solvent.symmetryParameters.a ) )
summary.Entry ( "Molecule Size", "{:.3f}".format ( size ) )
summary.Stop ( )
# . Return the cubic system.
return solvent
