Skip to content

GitLab

"wrappers/vscode:/vscode.git/clone" did not exist on "e16acd1bdd225ec0e58291d4489142d82f0662dd"
Commit fd74112b authored by Jason Swails's avatar Jason Swails
Browse files

Move all of the logic for GB parameter assignment into the new subclasses 

Previously, parameters were defined in multiple places -- amber_file_parser.py
and charmmpsffile.py.
parent 2acba7ad
Show whitespace changes
Inline Side-by-side
Showing with 237 additions and 181 deletions
wrappers/python/simtk/openmm/app/charmmpsffile.py
View file @ fd74112b
...@@ -32,9 +32,7 @@ DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR ...@@ -32,9 +32,7 @@ DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE. USE OR OTHER DEALINGS IN THE SOFTWARE.
""" """
from __future__ import division from __future__ import division, absolute_import, print_function
from __future__ import absolute_import
from __future__ import print_function
from functools import wraps from functools import wraps
from math import pi, cos, sin, sqrt from math import pi, cos, sin, sqrt
...@@ -666,88 +664,6 @@ class CharmmPsfFile(object): ...@@ -666,88 +664,6 @@ class CharmmPsfFile(object):
return topology return topology
def _get_gb_params(self, gb_model=HCT):
""" Gets the GB parameters. Need this method to special-case GB neck """
screen = [0 for atom in self.atom_list]
if gb_model is GBn:
radii = _bondi_radii(self.atom_list)
screen = [0.5 for atom in self.atom_list]
for i, atom in enumerate(self.atom_list):
if atom.type.atomic_number == 6:
screen[i] = 0.48435382330
elif atom.type.atomic_number == 1:
screen[i] = 1.09085413633
elif atom.type.atomic_number == 7:
screen[i] = 0.700147318409
elif atom.type.atomic_number == 8:
screen[i] = 1.06557401132
elif atom.type.atomic_number == 16:
screen[i] = 0.602256336067
elif gb_model is GBn2:
radii = _mbondi3_radii(self.atom_list)
# Add non-optimized values as defaults
alpha = [1.0 for i in self.atom_list]
beta = [0.8 for i in self.atom_list]
gamma = [4.85 for i in self.atom_list]
screen = [0.5 for i in self.atom_list]
for i, atom in enumerate(self.atom_list):
if atom.type.atomic_number == 6:
screen[i] = 1.058554
alpha[i] = 0.733756
beta[i] = 0.506378
gamma[i] = 0.205844
elif atom.type.atomic_number == 1:
screen[i] = 1.425952
alpha[i] = 0.788440
beta[i] = 0.798699
gamma[i] = 0.437334
elif atom.type.atomic_number == 7:
screen[i] = 0.733599
alpha[i] = 0.503364
beta[i] = 0.316828
gamma[i] = 0.192915
elif atom.type.atomic_number == 8:
screen[i] = 1.061039
alpha[i] = 0.867814
beta[i] = 0.876635
gamma[i] = 0.387882
elif atom.type.atomic_number == 16:
screen[i] = -0.703469
alpha[i] = 0.867814
beta[i] = 0.876635
gamma[i] = 0.387882
else:
# Set the default screening parameters
for i, atom in enumerate(self.atom_list):
if atom.type.atomic_number == 1:
screen[i] = 0.85
elif atom.type.atomic_number == 6:
screen[i] = 0.72
elif atom.type.atomic_number == 7:
screen[i] = 0.79
elif atom.type.atomic_number == 8:
screen[i] = 0.85
elif atom.type.atomic_number == 9:
screen[i] = 0.88
elif atom.type.atomic_number == 15:
screen[i] = 0.86
elif atom.type.atomic_number == 16:
screen[i] = 0.96
else:
screen[i] = 0.8
# Determine which radii set we need
if gb_model is OBC1 or gb_model is OBC2:
radii = _mbondi2_radii(self.atom_list)
elif gb_model is HCT:
radii = _mbondi_radii(self.atom_list)
length_conv = u.angstrom.conversion_factor_to(u.nanometer)
radii = [x * length_conv for x in radii]
if gb_model is GBn2:
return zip(radii, screen, alpha, beta, gamma)
return zip(radii, screen)
def createSystem(self, params, nonbondedMethod=ff.NoCutoff, def createSystem(self, params, nonbondedMethod=ff.NoCutoff,
nonbondedCutoff=1.0*u.nanometer, nonbondedCutoff=1.0*u.nanometer,
switchDistance=0.0*u.nanometer, switchDistance=0.0*u.nanometer,
...@@ -1249,8 +1165,6 @@ class CharmmPsfFile(object): ...@@ -1249,8 +1165,6 @@ class CharmmPsfFile(object):
# Add GB model if we're doing one # Add GB model if we're doing one
if implicitSolvent is not None: if implicitSolvent is not None:
if verbose: print('Adding GB parameters...') if verbose: print('Adding GB parameters...')
gb_parms = self._get_gb_params(implicitSolvent)
# If implicitSolventKappa is None, compute it from salt # If implicitSolventKappa is None, compute it from salt
# concentration # concentration
if implicitSolventKappa is None: if implicitSolventKappa is None:
...@@ -1289,6 +1203,7 @@ class CharmmPsfFile(object): ...@@ -1289,6 +1203,7 @@ class CharmmPsfFile(object):
elif implicitSolvent is GBn2: elif implicitSolvent is GBn2:
gb = GBSAGBn2Force(solventDielectric, soluteDielectric, None, gb = GBSAGBn2Force(solventDielectric, soluteDielectric, None,
cutoff, kappa=implicitSolventKappa) cutoff, kappa=implicitSolventKappa)
gb_parms = gb.getStandardParameters(self.topology)
for atom, gb_parm in zip(self.atom_list, gb_parms): for atom, gb_parm in zip(self.atom_list, gb_parms):
gb.addParticle([atom.charge] + list(gb_parm)) gb.addParticle([atom.charge] + list(gb_parm))
# Set cutoff method # Set cutoff method
......
wrappers/python/simtk/openmm/app/internal/amber_file_parser.py
View file @ fd74112b
...@@ -34,8 +34,7 @@ DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR ...@@ -34,8 +34,7 @@ DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE. USE OR OTHER DEALINGS IN THE SOFTWARE.
""" """
from __future__ import absolute_import from __future__ import absolute_import, print_function
from __future__ import print_function
#============================================================================================= #=============================================================================================
# GLOBAL IMPORTS # GLOBAL IMPORTS
...@@ -553,87 +552,6 @@ class PrmtopLoader(object): ...@@ -553,87 +552,6 @@ class PrmtopLoader(object):
self._excludedAtoms.append(atomList) self._excludedAtoms.append(atomList)
return self._excludedAtoms return self._excludedAtoms
def getGBParms(self, gbmodel, elements):
"""Return list giving GB params, Radius and screening factor"""
gb_List=[]
radii=[float(r) for r in self._raw_data["RADII"]]
screen=[float(s) for s in self._raw_data["SCREEN"]]
if gbmodel == 'GBn2':
alpha = [0 for i in self._raw_data['RADII']]
beta = [0 for i in self._raw_data['RADII']]
gamma = [0 for i in self._raw_data['RADII']]
# Update screening parameters for GBn if specified
if gbmodel == 'GBn':
if elements is None:
raise Exception('GBn model requires element information')
for i, element in enumerate(elements):
if element is elem.carbon:
screen[i] = 0.48435382330
elif element is elem.hydrogen:
screen[i] = 1.09085413633
elif element is elem.nitrogen:
screen[i] = 0.700147318409
elif element is elem.oxygen:
screen[i] = 1.06557401132
elif element is elem.sulfur:
screen[i] = 0.602256336067
else:
screen[i] = 0.5
# radii is currently in Angstroms right now. GBn lookup tables
# only support radii between 1.0 and 2.0
if radii[i] < 1.0 or radii[i] > 2.0:
raise ValueError('GBn requires intrinsic radii between 1 and '
'2 Angstroms (%.3f found for atom %d)' %
(radii[i], i))
if gbmodel == 'GBn2':
if elements is None:
raise Exception('GBn2 model requires element information')
for i, element in enumerate(elements):
if element is elem.carbon:
screen[i] = 1.058554
alpha[i] = 0.733756
beta[i] = 0.506378
gamma[i] = 0.205844
elif element is elem.hydrogen:
screen[i] = 1.425952
alpha[i] = 0.788440
beta[i] = 0.798699
gamma[i] = 0.437334
elif element is elem.nitrogen:
screen[i] = 0.733599
alpha[i] = 0.503364
beta[i] = 0.316828
gamma[i] = 0.192915
elif element is elem.oxygen:
screen[i] = 1.061039
alpha[i] = 0.867814
beta[i] = 0.876635
gamma[i] = 0.387882
elif element is elem.sulfur:
screen[i] = -0.703469
alpha[i] = 0.867814
beta[i] = 0.876635
gamma[i] = 0.387882
else: # not optimized
screen[i] = 0.5
alpha[i] = 1.0
beta[i] = 0.8
gamma[i] = 4.85
# radii is currently in Angstroms right now. GBn lookup tables
# only support radii between 1.0 and 2.0
if radii[i] < 1.0 or radii[i] > 2.0:
raise ValueError('GBn2 requires intrinsic radii between 1 and '
'2 Angstroms (%.3f found for atom %d)' %
(radii[i], i))
lengthConversionFactor = units.angstrom.conversion_factor_to(units.nanometer)
if gbmodel == 'GBn2':
for rad, scr, alp, bet, gam in zip(radii, screen, alpha, beta, gamma):
gb_List.append((rad*lengthConversionFactor, scr, alp, bet, gam))
else:
for rad, scr in zip(radii, screen):
gb_List.append((rad*lengthConversionFactor, scr))
return gb_List
def getBoxBetaAndDimensions(self): def getBoxBetaAndDimensions(self):
"""Return periodic boundary box beta angle and dimensions""" """Return periodic boundary box beta angle and dimensions"""
beta=float(self._raw_data["BOX_DIMENSIONS"][0]) beta=float(self._raw_data["BOX_DIMENSIONS"][0])
...@@ -1053,7 +971,6 @@ def readAmberSystem(topology, prmtop_filename=None, prmtop_loader=None, shake=No ...@@ -1053,7 +971,6 @@ def readAmberSystem(topology, prmtop_filename=None, prmtop_loader=None, shake=No
cutoff = nonbondedCutoff cutoff = nonbondedCutoff
if units.is_quantity(cutoff): if units.is_quantity(cutoff):
cutoff = cutoff.value_in_unit(units.nanometers) cutoff = cutoff.value_in_unit(units.nanometers)
gb_parms = prmtop.getGBParms(gbmodel, elements)
if gbmodel == 'HCT': if gbmodel == 'HCT':
gb = customgb.GBSAHCTForce(solventDielectric, soluteDielectric, 'ACE', cutoff, implicitSolventKappa) gb = customgb.GBSAHCTForce(solventDielectric, soluteDielectric, 'ACE', cutoff, implicitSolventKappa)
elif gbmodel == 'OBC1': elif gbmodel == 'OBC1':
...@@ -1070,7 +987,24 @@ def readAmberSystem(topology, prmtop_filename=None, prmtop_loader=None, shake=No ...@@ -1070,7 +987,24 @@ def readAmberSystem(topology, prmtop_filename=None, prmtop_loader=None, shake=No
elif gbmodel == 'GBn2': elif gbmodel == 'GBn2':
gb = customgb.GBSAGBn2Force(solventDielectric, soluteDielectric, 'ACE', cutoff, implicitSolventKappa) gb = customgb.GBSAGBn2Force(solventDielectric, soluteDielectric, 'ACE', cutoff, implicitSolventKappa)
else: else:
raise Exception("Illegal value specified for implicit solvent model") raise ValueError("Illegal value specified for implicit solvent model")
gb_parms = gb.getStandardParameters(gbmodel, elements)
# Replace radii and screen, but screen *only* gets replaced by the
# prmtop contents for HCT, OBC1, and OBC2. GBn and GBn2 both override
# the prmtop screen factors from LEaP in sander and pmemd
if gbmodel in ('HCT', 'OBC1', 'OBC2'):
screen = [float(s) for s in self._raw_data['SCREEN']]
else:
screen = [gb_parm[1] for gb_parm in gb_parms]
radii = [float(r)/10 for r in self._raw_data['RADII']]
warned = False
for i, (r, s) in enumerate(zip(radii, screen)):
if abs(r - gb_parms[0]) > 1e-4 or abs(s - gb_parms[1]) > 1e-4:
if not warned:
warnings.warn('Non-optimal GB parameters detected for GB '
'model %s' % gbmodel)
warned = True
gb_parms[0], gb_parms[1] = r, s
for charge, gb_parm in zip(charges, gb_parms): for charge, gb_parm in zip(charges, gb_parms):
if gbmodel == 'OBC2' and implicitSolventKappa == 0: if gbmodel == 'OBC2' and implicitSolventKappa == 0:
......
wrappers/python/simtk/openmm/app/internal/customgbforces.py
View file @ fd74112b
...@@ -29,10 +29,11 @@ OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE ...@@ -29,10 +29,11 @@ OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE. USE OR OTHER DEALINGS IN THE SOFTWARE.
""" """
from __future__ import division from __future__ import division, absolute_import
from __future__ import absolute_import
from collections import defaultdict
import copy import copy
import simtk.openmm.app.element as E
from simtk.openmm import CustomGBForce, Continuous2DFunction from simtk.openmm import CustomGBForce, Continuous2DFunction
import simtk.unit as u import simtk.unit as u
...@@ -196,6 +197,141 @@ for i in range (len(d0)): ...@@ -196,6 +197,141 @@ for i in range (len(d0)):
d0[i]=d0[i]/10 d0[i]=d0[i]/10
m0[i]=m0[i]*10 m0[i]=m0[i]*10
def _get_bonded_atom_list(topology):
""" Returns a list of atoms bonded to each other atom in a dict """
bondeds = defaultdict(list)
for a1, a2 in topology.bonds():
bondeds[a1].append(a2)
bondeds[a2].append(a1)
return bondeds
def _is_carboxylateO(atom, all_bonds):
if atom is not E.oxygen: return False
bondeds = all_bonds[atom]
if len(bondeds) != 1:
return False
if bondeds[0].element is not E.carbon:
return False
bondedsC = all_bonds[bondeds[0]]
if len(bondedsC) != 3:
return False
for a3 in bondedsC:
if a3 is atom: continue
if a3.element is E.oxygen:
break
else:
return False
# If we got here, must be a carboxylate
return True
def _bondi_radii(topology):
""" Sets the bondi radii """
radii = [0.0 for atom in topology.getAtoms()]
for i, atom in enumerate(topology.getAtoms()):
if atom.element is E.carbon:
radii[i] = 1.7
elif atom.element in (E.hydrogen, E.deuterium);
radii[i] = 1.2
elif atom.element is E.nitrogen:
radii[i] = 1.55
elif atom.element is E.oxygen:
radii[i] = 1.5
elif atom.element is E.fluorine:
radii[i] = 1.5
elif atom.element is E.silicon:
radii[i] = 2.1
elif atom.element is E.phosphorus:
radii[i] = 1.85
elif atom.element is E.sulfur:
radii[i] = 1.8
elif atom.element is E.chlorine:
radii[i] = 1.5
else:
radii[i] = 1.5
return radii # converted to nanometers above
def _mbondi_radii(topology):
""" Sets the mbondi radii """
radii = [0.0 for atom in topology.getAtoms()]
all_bonds = _get_bonded_atom_list(topology)
for i, atom in enumerate(topology.getAtoms()):
# Radius of H atom depends on element it is bonded to
if atom.element in (E.hydrogen, E.deuterium):
bondeds = all_bonds[atom]
if bondeds[0].element in (E.carbon, E.nitrogen):
radii[i] = 1.3
elif bondeds[0].type.atomic_number in (E.oxygen, E.sulfur):
radii[i] = 0.8
else:
radii[i] = 1.2
# Radius of C atom depends on what type it is
elif atom.element is E.carbon:
radii[i] = 1.7
# All other elements have fixed radii for all types/partners
elif atom.element is E.nitrogen:
radii[i] = 1.55
elif atom.element is E.oxygen:
radii[i] = 1.5
elif atom.element is E.fluorine:
radii[i] = 1.5
elif atom.element is E.silicon:
radii[i] = 2.1
elif atom.element is E.phosphorus:
radii[i] = 1.85
elif atom.element is E.sulfur:
radii[i] = 1.8
elif atom.element is E.chlorine:
radii[i] = 1.5
else:
radii[i] = 1.5
return radii # converted to nanometers above
def _mbondi2_radii(topology):
""" Sets the mbondi2 radii """
radii = [0.0 for atom in atom_list]
all_bonds = _get_bonded_atom_list(topology)
for i, atom in enumerate(atom_list):
# Radius of H atom depends on element it is bonded to
if atom.element in (E.hydrogen, E.deuterium):
bondeds = all_bonds[atom]
if bondeds[0].element is E.nitrogen:
radii[i] = 1.3
else:
radii[i] = 1.2
# Radius of C atom depends on what type it is
elif atom.element is E.carbon:
radii[i] = 1.7
# All other elements have fixed radii for all types/partners
elif atom.element is E.nitrogen:
radii[i] = 1.55
elif atom.element is E.oxygen:
radii[i] = 1.5
elif atom.element is E.fluorine:
radii[i] = 1.5
elif atom.element is E.silicon:
radii[i] = 2.1
elif atom.element == E.phosphorus:
radii[i] = 1.85
elif atom.element == E.sulfur:
radii[i] = 1.8
elif atom.element == E.chlorine:
radii[i] = 1.5
else:
radii[i] = 1.5
return radii # Converted to nanometers above
def _mbondi3_radii(topology):
""" Sets the mbondi3 radii """
radii = _mbondi2_radii(topology)
all_bonds = _get_bonded_atom_list(topology)
for i, atom in enumerate(topology.getAtoms()):
# carboxylate and HH/HE (ARG)
if _is_carboxylateO(atom, all_bonds):
radii[i] = 1.4
elif atom.residue.name == 'ARG':
if atom.name.startswith('HH') or atom.name.startswith('HE'):
radii[i] = 1.17
return radii # Converted to nanometers above
def _createEnergyTerms(force, solventDielectric, soluteDielectric, SA, cutoff, kappa, offset): def _createEnergyTerms(force, solventDielectric, soluteDielectric, SA, cutoff, kappa, offset):
# Add the energy terms to the CustomGBForce. These are identical for all the GB models. # Add the energy terms to the CustomGBForce. These are identical for all the GB models.
...@@ -231,6 +367,22 @@ def _createEnergyTerms(force, solventDielectric, soluteDielectric, SA, cutoff, k ...@@ -231,6 +367,22 @@ def _createEnergyTerms(force, solventDielectric, soluteDielectric, SA, cutoff, k
force.addEnergyTerm("-138.935485*(1/soluteDielectric-1/solventDielectric)*q1*q2*(1/f-"+str(1/cutoff)+");" force.addEnergyTerm("-138.935485*(1/soluteDielectric-1/solventDielectric)*q1*q2*(1/f-"+str(1/cutoff)+");"
"f=sqrt(r^2+B1*B2*exp(-r^2/(4*B1*B2)))"+params, CustomGBForce.ParticlePairNoExclusions) "f=sqrt(r^2+B1*B2*exp(-r^2/(4*B1*B2)))"+params, CustomGBForce.ParticlePairNoExclusions)
_SCREEN_PARAMETERS = { # normal, GBn, GBn2
E.hydrogen : (0.85, 1.09085413633, 1.425952),
E.carbon : (0.72, 0.48435382330, 1.058554),
E.nitrogen : (0.79, 0.700147318409, 0.733599),
E.oxygen : (0.85, 1.06557401132, 1.061039),
E.fluorine : (0.88, 0.5, 0.5),
E.phosphorus : (0.86, 0.5, 0.5),
E.sulfur : (0.96, 0.602256336067, -0.703469),
None : (0.8, 0.5, 0.5) # default
}
_SCREEN_PARAMETERS[E.deuterium] = _SCREEN_PARAMETERS[E.hydrogen]
def _screen_parameter(atom):
if atom.element in _SCREEN_PARAMETERS:
return _SCREEN_PARAMETERS[atom.element]
return _SCREEN_PARAMETERS[None]
class CustomAmberGBForce(CustomGBForce): class CustomAmberGBForce(CustomGBForce):
OFFSET = 0.009 OFFSET = 0.009
...@@ -254,6 +406,24 @@ class CustomAmberGBForce(CustomGBForce): ...@@ -254,6 +406,24 @@ class CustomAmberGBForce(CustomGBForce):
CustomGBForce.addParticle(self, params) CustomGBForce.addParticle(self, params)
return params return params
@staticmethod
def getStandardParameters(topology):
""" Gets list of standard parameters for this GB model based on an input Topology
Parameters
----------
topology : simtk.openmm.app.Topology
Topology of the system to get parameters for
Returns
-------
list of float
List of all parameters needed for this GB model. These can be passed
to addParticle or setParticleParameters after the charge is inserted
at the beginning of the list
"""
raise NotImplementedError('Must override getStandardParameters in subclasses')
""" """
Amber Equivalent: igb = 1 Amber Equivalent: igb = 1
""" """
...@@ -275,6 +445,13 @@ class GBSAHCTForce(CustomAmberGBForce): ...@@ -275,6 +445,13 @@ class GBSAHCTForce(CustomAmberGBForce):
self.addComputedValue("B", "1/(1/or-I)", CustomGBForce.SingleParticle) self.addComputedValue("B", "1/(1/or-I)", CustomGBForce.SingleParticle)
_createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009) _createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009)
@staticmethod
def getStandardParameters(topology):
radii = [[x/10] for x in _mbondi_radii(topology)]
for i, atom in zip(topology.getAtoms()):
radii[i].append(_screen_parameter(atom)[0])
return radii
""" """
Amber Equivalents: igb = 2 Amber Equivalents: igb = 2
""" """
...@@ -297,10 +474,17 @@ class GBSAOBC1Force(CustomAmberGBForce): ...@@ -297,10 +474,17 @@ class GBSAOBC1Force(CustomAmberGBForce):
"psi=I*or; radius=or+offset; offset=0.009", CustomGBForce.SingleParticle) "psi=I*or; radius=or+offset; offset=0.009", CustomGBForce.SingleParticle)
_createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009) _createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009)
@staticmethod
def getStandardParameters(topology):
radii = [[x/10] for x in _mbondi2_radii(topology)]
for i, atom in zip(topology.getAtoms()):
radii[i].append(_screen_parameter(atom)[0])
return radii
""" """
Amber Equivalents: igb = 5 Amber Equivalents: igb = 5
""" """
class GBSAOBC2Force(CustomAmberGBForce): class GBSAOBC2Force(GBSAOBC1Force):
def __init__(self, solventDielectric=78.5, soluteDielectric=1, SA=None, def __init__(self, solventDielectric=78.5, soluteDielectric=1, SA=None,
cutoff=None, kappa=0.0): cutoff=None, kappa=0.0):
...@@ -359,6 +543,13 @@ class GBSAGBnForce(CustomAmberGBForce): ...@@ -359,6 +543,13 @@ class GBSAGBnForce(CustomAmberGBForce):
if parameters[1] < 0.1 or parameters[1] > 0.2: if parameters[1] < 0.1 or parameters[1] > 0.2:
raise ValueError('Radii must be between 1 and 2 Angstroms for neck lookup') raise ValueError('Radii must be between 1 and 2 Angstroms for neck lookup')
@staticmethod
def getStandardParameters(topology):
radii = [[x/10] for x in _bondi_radii(topology)]
for i, atom in zip(topology.getAtoms()):
radii[i].append(_screen_parameter(atom)[1])
return radii
""" """
Amber Equivalents: igb = 8 Amber Equivalents: igb = 8
""" """
...@@ -393,3 +584,22 @@ class GBSAGBn2Force(GBSAGBnForce): ...@@ -393,3 +584,22 @@ class GBSAGBn2Force(GBSAGBnForce):
self.addComputedValue("B", "1/(1/or-tanh(alpha*psi-beta*psi^2+gamma*psi^3)/radius);" self.addComputedValue("B", "1/(1/or-tanh(alpha*psi-beta*psi^2+gamma*psi^3)/radius);"
"psi=I*or; radius=or+offset; offset=0.0195141", CustomGBForce.SingleParticle) "psi=I*or; radius=or+offset; offset=0.0195141", CustomGBForce.SingleParticle)
_createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.0195141) _createEnergyTerms(self, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.0195141)
@staticmethod
def getStandardParameters(topology):
radii = [[x/10] for x in _mbondi3_radii(topology)]
for i, atom in zip(topology.getAtoms()):
radii[i].append(_screen_parameter(atom)[2])
if atom.element in (E.hydrogen, E.deuterium):
radii[i].extend([0.788440, 0.798699, 0.437334])
elif atom.element is E.carbon:
radii[i].extend([0.733756, 0.506378, 0.205844])
elif atom.element is E.nitrogen:
radii[i].extend([0.503364, 0.316828, 0.192915])
elif atom.element is E.oxygen:
radii[i].extend([0.867814, 0.876635, 0.387882])
elif atom.element is E.sulfur:
radii[i].extend([0.867814, 0.876635, 0.387882])
else:
radii[i].extend([0.8, 4.85, 0.5])
return radii
wrappers/python/simtk/openmm/app/topology.py
View file @ fd74112b
...@@ -71,20 +71,17 @@ class Topology(object): ...@@ -71,20 +71,17 @@ class Topology(object):
def getNumAtoms(self): def getNumAtoms(self):
"""Return the number of atoms in the Topology. """Return the number of atoms in the Topology.
""" """
natom = self._numAtoms return self._numAtoms
return natom
def getNumResidues(self): def getNumResidues(self):
"""Return the number of residues in the Topology. """Return the number of residues in the Topology.
""" """
nres = self._numResidues return self._numResidues
return nres
def getNumChains(self): def getNumChains(self):
"""Return the number of chains in the Topology. """Return the number of chains in the Topology.
""" """
nchain = len(self._chains) return len(self._chains)
return nchain
def addChain(self, id=None): def addChain(self, id=None):
"""Create a new Chain and add it to the Topology. """Create a new Chain and add it to the Topology.
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment