Merge remote-tracking branch 'upstream/master'

wrappers/python/simtk/openmm/app/charmmcrdfiles.py

@@ -13,7 +13,7 @@ Copyright (c) 2014 the Authors
 
 Author: Jason Deckman
 Contributors: Jason M. Swails
-Date: April 19, 2014
+Date: June 6, 2014
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
@@ -105,7 +105,7 @@ class CharmmCrdFile(object):
                 self.resname.append(line[2])
                 self.attype.append(line[3])
                 pos = Vec3(float(line[4]), float(line[5]), float(line[6]))
-                self.positions.append(pos * u.angstroms)
+                self.positions.append(pos)
                 self.segid.append(line[7])
                 self.resid.append(int(line[8]))
                 self.weighting.append(float(line[9]))
@@ -120,6 +120,10 @@ class CharmmCrdFile(object):
         except (ValueError, IndexError), e:
             raise CharmmFileError('Error parsing CHARMM coordinate file')
 
+        # Apply units to the positions now. Do it this way to allow for
+        # (possible) numpy functionality in the future.
+        self.positions = u.Quantity(self.positions, u.angstroms)
+
 class CharmmRstFile(object):
     """
     Reads and parses data, velocities and coordinates from a CHARMM restart
@@ -209,8 +213,9 @@ class CharmmRstFile(object):
         self.velocities = [v * ONE_TIMESCALE for v in self.velocities]
 
         # Add units to positions and velocities
-        self.positions *= u.angstroms
-        self.velocities *= u.angstroms / u.picoseconds
+        self.positions = u.Quantity(self.positions, u.angstroms)
+        self.positionsold = u.Quantity(self.positionsold, u.angstroms)
+        self.velocities = u.Quantity(self.velocities, u.angstroms/u.picoseconds)
 
     def _scan(self, handle, str, r=0): # read lines in file until str is found
         scanning = True

wrappers/python/simtk/openmm/app/charmmparameterset.py

@@ -241,6 +241,10 @@ class CharmmParameterSet(object):
             if line.startswith('HBOND'):
                 section = None
                 continue
+            # It seems like files? sections? can be terminated with 'END'
+            if line.startswith('END'): # should this be case-insensitive?
+                section = None
+                continue
             # If we have no section, skip
             if section is None: continue
             # Now handle each section specifically

wrappers/python/simtk/openmm/app/charmmpsffile.py

@@ -90,6 +90,7 @@ class CharmmPsfFile(object):
         - bond_list
         - angle_list
         - dihedral_list
+        - dihedral_parameter_list
         - improper_list
         - cmap_list
         - donor_list    # hbonds donors?
@@ -349,6 +350,7 @@ class CharmmPsfFile(object):
         self.bond_list = bond_list
         self.angle_list = angle_list
         self.dihedral_list = dihedral_list
+        self.dihedral_parameter_list = TrackedList()
         self.improper_list = improper_list
         self.cmap_list = cmap_list
         self.donor_list = donor_list
@@ -599,9 +601,9 @@ class CharmmPsfFile(object):
               central atoms in impropers) and see if that matches.  Wild-cards
               will apply ONLY if specific parameters cannot be found.
 
-            - This method will expand the dihedral_list attribute by adding a
-              separate Dihedral object for each term for types that have a
-              multi-term expansion
+            - This method will expand the dihedral_parameter_list attribute by
+              adding a separate Dihedral object for each term for types that
+              have a multi-term expansion
         """
         # First load the atom types
         types_are_int = False
@@ -643,12 +645,9 @@ class CharmmPsfFile(object):
                     self.urey_bradley_list.append(ub)
             except KeyError:
                 raise MissingParameter('Missing angle type for %r' % ang)
-        # Next load all of the dihedrals. This is a little trickier since we
-        # need to back up the existing dihedral list and replace it with a
-        # longer one that has only one Fourier term per Dihedral instance.
-        dihedral_list = self.dihedral_list
-        self.dihedral_list = TrackedList()
-        for dih in dihedral_list:
+        # Next load all of the dihedrals.
+        self.dihedral_parameter_list = TrackedList()
+        for dih in self.dihedral_list:
             # Store the atoms
             a1, a2, a3, a4 = dih.atom1, dih.atom2, dih.atom3, dih.atom4
             at1, at2, at3, at4 = a1.attype, a2.attype, a3.attype, a4.attype
@@ -662,14 +661,14 @@ class CharmmPsfFile(object):
                                            '%r' % dih)
             dtlist = parmset.dihedral_types[key]
             for i, dt in enumerate(dtlist):
-                self.dihedral_list.append(Dihedral(a1, a2, a3, a4, dt))
+                self.dihedral_parameter_list.append(Dihedral(a1,a2,a3,a4,dt))
                 # See if we include the end-group interactions for this
                 # dihedral. We do IFF it is the last or only dihedral term and
                 # it is NOT in the angle/bond partners
                 if i != len(dtlist) - 1:
-                    self.dihedral_list[-1].end_groups_active = False
+                    self.dihedral_parameter_list[-1].end_groups_active = False
                 elif a1 in a4.bond_partners or a1 in a4.angle_partners:
-                    self.dihedral_list[-1].end_groups_active = False
+                    self.dihedral_parameter_list[-1].end_groups_active = False
         # Now do the impropers
         for imp in self.improper_list:
             # Store the atoms
@@ -755,6 +754,12 @@ class CharmmPsfFile(object):
             - alpha, beta, gamma (floats, optional) : Angles between the
                 periodic cells.
         """
+        try:
+            # Since we are setting the box, delete the cached box lengths if we
+            # have them to make sure they are recomputed if desired.
+            del self._boxLengths
+        except AttributeError:
+            pass
         self.box_vectors = _box_vectors_from_lengths_angles(a, b, c,
                                                             alpha, beta, gamma)
         # If we already have a _topology instance, then we have possibly changed
@@ -952,8 +957,6 @@ class CharmmPsfFile(object):
          -  flexibleConstraints (bool=True) Are our constraints flexible or not?
          -  verbose (bool=False) Optionally prints out a running progress report
         """
-        # back up the dihedral list
-        dihedral_list = self.dihedral_list
         # Load the parameter set
         self.loadParameters(params.condense())
         hasbox = self.topology.getUnitCellDimensions() is not None
@@ -1103,7 +1106,7 @@ class CharmmPsfFile(object):
         if verbose: print('Adding torsions...')
         force = mm.PeriodicTorsionForce()
         force.setForceGroup(self.DIHEDRAL_FORCE_GROUP)
-        for tor in self.dihedral_list:
+        for tor in self.dihedral_parameter_list:
             force.addTorsion(tor.atom1.idx, tor.atom2.idx, tor.atom3.idx,
                              tor.atom4.idx, tor.dihedral_type.per,
                              tor.dihedral_type.phase*pi/180,
@@ -1235,7 +1238,7 @@ class CharmmPsfFile(object):
         # Add 1-4 interactions
         excluded_atom_pairs = set() # save these pairs so we don't zero them out
         sigma_scale = 2**(-1/6)
-        for tor in self.dihedral_list:
+        for tor in self.dihedral_parameter_list:
             # First check to see if atoms 1 and 4 are already excluded because
             # they are 1-2 or 1-3 pairs (would happen in 6-member rings or
             # fewer). Then check that they're not already added as exclusions
@@ -1355,9 +1358,6 @@ class CharmmPsfFile(object):
         # Cache our system for easy access
         self._system = system
 
-        # Restore the dihedral list to allow reparametrization later
-        self.dihedral_list = dihedral_list
-
         return system
 
     @property
@@ -1422,9 +1422,30 @@ class CharmmPsfFile(object):
     @property
     def boxLengths(self):
         """ Return tuple of 3 units """
+        try:
+            # See if we have a cached version
+            return self._boxLengths
+        except AttributeError:
+            pass
         if self.box_vectors is not None:
-            return (self.box_vectors[0][0], self.box_vectors[0][1],
-                    self.box_vectors[0][2])
+            # Get the lengths of each vector
+            if u.is_quantity(self.box_vectors):
+                # Unlikely -- each vector is like a quantity
+                vecs = self.box_vectors.value_in_unit(u.nanometers)
+            elif u.is_quantity(self.box_vectors[0]):
+                # Assume all box vectors are quantities
+                vecs = [x.value_in_unit(u.nanometers) for x in self.box_vectors]
+            else:
+                # Assume nanometers
+                vecs = self.box_vectors
+            a = sqrt(vecs[0][0]*vecs[0][0] + vecs[0][1]*vecs[0][1] +
+                     vecs[0][2]*vecs[0][2])
+            b = sqrt(vecs[1][0]*vecs[1][0] + vecs[1][1]*vecs[1][1] +
+                     vecs[1][2]*vecs[1][2])
+            c = sqrt(vecs[2][0]*vecs[2][0] + vecs[2][1]*vecs[2][1] +
+                     vecs[2][2]*vecs[2][2])
+            self._boxLengths = (a, b, c) * u.nanometers
+            return self._boxLengths
         return None
 
     @boxLengths.setter
@@ -1440,6 +1461,12 @@ class CharmmPsfFile(object):
     @boxVectors.setter
     def boxVectors(self, stuff):
         """ Sets the box vectors """
+        try:
+            # We may be changing the box, so delete the cached box lengths to
+            # make sure they are recomputed if desired
+            del self._boxLengths
+        except AttributeError:
+            pass
         self.box_vectors = stuff
 
     def deleteCmap(self):

wrappers/python/simtk/openmm/app/data/tip3pfb.xml

+<ForceField>
+ <Info>
+  <DateGenerated>2014-05-28</DateGenerated>
+  <Reference>Lee-Ping Wang, Todd J. Martinez and Vijay S. Pande. Building force fields - an automatic, systematic and reproducible approach.  Journal of Physical Chemistry Letters, 2014, 5, pp 1885-1891.  DOI:10.1021/jz500737m</Reference>
+ </Info>
+ <AtomTypes>
+  <Type name="tip3p-fb-O" class="OW" element="O" mass="15.99943"/>
+  <Type name="tip3p-fb-H" class="HW" element="H" mass="1.007947"/>
+ </AtomTypes>
+ <Residues>
+  <Residue name="HOH">
+   <Atom name="O" type="tip3p-fb-O"/>
+   <Atom name="H1" type="tip3p-fb-H"/>
+   <Atom name="H2" type="tip3p-fb-H"/>
+   <Bond from="0" to="1"/>
+   <Bond from="0" to="2"/>
+  </Residue>
+ </Residues>
+ <HarmonicBondForce>
+  <Bond class1="OW" class2="HW" length="0.101181082494" k="462750.4"/>
+ </HarmonicBondForce>
+ <HarmonicAngleForce>
+  <Angle class1="HW" class2="OW" class3="HW" angle="1.88754640288" k="836.8"/>
+ </HarmonicAngleForce>
+ <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5">
+  <Atom type="tip3p-fb-O" charge="-0.848448690103" sigma="0.317796456355" epsilon="0.652143528104" />
+  <Atom type="tip3p-fb-H" charge="0.4242243450515" sigma="1" epsilon="0" />
+ </NonbondedForce>
+</ForceField>
+

wrappers/python/simtk/openmm/app/data/tip4pfb.xml

+<ForceField>
+ <Info>
+  <DateGenerated>2014-05-28</DateGenerated>
+  <Reference>Lee-Ping Wang, Todd J. Martinez and Vijay S. Pande. Building force fields - an automatic, systematic and reproducible approach.  Journal of Physical Chemistry Letters, 2014, 5, pp 1885-1891.  DOI:10.1021/jz500737m</Reference>
+ </Info>
+ <AtomTypes>
+  <Type name="tip4p-fb-O" class="OW" element="O" mass="15.99943"/>
+  <Type name="tip4p-fb-H" class="HW" element="H" mass="1.007947"/>
+  <Type name="tip4p-fb-M" class="MW" mass="0"/>
+ </AtomTypes>
+ <Residues>
+  <Residue name="HOH">
+   <Atom name="O" type="tip4p-fb-O"/>
+   <Atom name="H1" type="tip4p-fb-H"/>
+   <Atom name="H2" type="tip4p-fb-H"/>
+   <Atom name="M" type="tip4p-fb-M"/>
+   <VirtualSite type="average3" index="3" atom1="0" atom2="1" atom3="2" weight1="8.203146574531e-01" weight2="8.984267127345e-02" weight3="8.984267127345e-02" />
+   <Bond from="0" to="1"/>
+   <Bond from="0" to="2"/>
+  </Residue>
+ </Residues>
+ <HarmonicBondForce>
+  <Bond class1="OW" class2="HW" length="0.09572" k="462750.4"/>
+ </HarmonicBondForce>
+ <HarmonicAngleForce>
+  <Angle class1="HW" class2="OW" class3="HW" angle="1.82421813418" k="836.8"/>
+ </HarmonicAngleForce>
+ <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5">
+  <Atom type="tip4p-fb-O" charge="0" sigma="3.165552430462e-01" epsilon="7.492790213533e-01" />
+  <Atom type="tip4p-fb-H" charge="5.258681106763e-01" sigma="1" epsilon="0" />
+  <Atom type="tip4p-fb-M" charge="-1.0517362213526e+00" sigma="1" epsilon="0" />
+ </NonbondedForce>
+</ForceField>

wrappers/python/simtk/openmm/app/forcefield.py

@@ -6,7 +6,7 @@ Simbios, the NIH National Center for Physics-Based Simulation of
 Biological Structures at Stanford, funded under the NIH Roadmap for
 Medical Research, grant U54 GM072970. See https://simtk.org.
 
-Portions copyright (c) 2012-2013 Stanford University and the Authors.
+Portions copyright (c) 2012-2014 Stanford University and the Authors.
 Authors: Peter Eastman, Mark Friedrichs
 Contributors:
 
@@ -1485,6 +1485,104 @@ class CustomTorsionGenerator:
 parsers["CustomTorsionForce"] = CustomTorsionGenerator.parseElement
 
 
+## @private
+class CustomNonbondedGenerator:
+    """A CustomNonbondedGenerator constructs a CustomNonbondedForce."""
+
+    def __init__(self, energy, bondCutoff):
+        self.energy = energy
+        self.bondCutoff = bondCutoff
+        self.typeMap = {}
+        self.globalParams = {}
+        self.perParticleParams = []
+        self.functions = []
+
+    @staticmethod
+    def parseElement(element, ff):
+        generator = CustomNonbondedGenerator(element.attrib['energy'], int(element.attrib['bondCutoff']))
+        ff._forces.append(generator)
+        for param in element.findall('GlobalParameter'):
+            generator.globalParams[param.attrib['name']] = float(param.attrib['defaultValue'])
+        for param in element.findall('PerParticleParameter'):
+            generator.perParticleParams.append(param.attrib['name'])
+        for atom in element.findall('Atom'):
+            types = ff._findAtomTypes(atom, 1)
+            if None not in types:
+                values = [float(atom.attrib[param]) for param in generator.perParticleParams]
+                for t in types[0]:
+                    generator.typeMap[t] = values
+
+    def createForce(self, sys, data, nonbondedMethod, nonbondedCutoff, args):
+        methodMap = {NoCutoff:mm.CustomNonbondedForce.NoCutoff,
+                     CutoffNonPeriodic:mm.CustomNonbondedForce.CutoffNonPeriodic,
+                     CutoffPeriodic:mm.CustomNonbondedForce.CutoffPeriodic}
+        if nonbondedMethod not in methodMap:
+            raise ValueError('Illegal nonbonded method for CustomNonbondedForce')
+        force = mm.CustomNonbondedForce(self.energy)
+        for param in self.globalParams:
+            force.addGlobalParameter(param, self.globalParams[param])
+        for param in self.perParticleParams:
+            force.addPerParticleParameter(param)
+        for (name, type, values, params) in self.functions:
+            if type == 'Continuous1D':
+                force.addTabulatedFunction(name, mm.Continuous1DFunction(values, params['min'], params['max']))
+            elif type == 'Continuous2D':
+                force.addTabulatedFunction(name, mm.Continuous2DFunction(params['xsize'], params['ysize'], values, params['xmin'], params['xmax'], params['ymin'], params['ymax']))
+            elif type == 'Continuous3D':
+                force.addTabulatedFunction(name, mm.Continuous2DFunction(params['xsize'], params['ysize'], params['zsize'], values, params['xmin'], params['xmax'], params['ymin'], params['ymax'], params['zmin'], params['zmax']))
+            elif type == 'Discrete1D':
+                force.addTabulatedFunction(name, mm.Discrete1DFunction(values))
+            elif type == 'Discrete2D':
+                force.addTabulatedFunction(name, mm.Discrete2DFunction(params['xsize'], params['ysize'], values))
+            elif type == 'Discrete3D':
+                force.addTabulatedFunction(name, mm.Discrete2DFunction(params['xsize'], params['ysize'], params['zsize'], values))
+        for atom in data.atoms:
+            t = data.atomType[atom]
+            if t in self.typeMap:
+                values = self.typeMap[t]
+                force.addParticle(self.typeMap[t])
+            else:
+                raise ValueError('No CustomNonbonded parameters defined for atom type '+t)
+        force.setNonbondedMethod(methodMap[nonbondedMethod])
+        force.setCutoffDistance(nonbondedCutoff)
+        sys.addForce(force)
+
+    def postprocessSystem(self, sys, data, args):
+        # Create exceptions based on bonds, virtual sites, and Drude particles.
+        if self.bondCutoff == 0:
+            return
+        bondIndices = []
+        for bond in data.bonds:
+            bondIndices.append((bond.atom1, bond.atom2))
+        for i in range(sys.getNumParticles()):
+            if sys.isVirtualSite(i):
+                site = sys.getVirtualSite(i)
+                for j in range(site.getNumParticles()):
+                    bondIndices.append((i, site.getParticle(j)))
+        drude = [f for f in sys.getForces() if isinstance(f, mm.DrudeForce)]
+        if len(drude) > 0:
+            drude = drude[0]
+            # For purposes of creating exceptions, a Drude particle is "bonded" to anything
+            # its parent atom is bonded to.
+            drudeMap = {}
+            for i in range(drude.getNumParticles()):
+                params = drude.getParticleParameters(i)
+                drudeMap[params[1]] = params[0]
+            for atom1, atom2 in bondIndices:
+                drude1 = drudeMap[atom1] if atom1 in drudeMap else None
+                drude2 = drudeMap[atom2] if atom2 in drudeMap else None
+                if drude1 is not None:
+                    bondIndices.append((drude1, atom2))
+                    if drude2 is not None:
+                        bondIndices.append((drude1, drude2))
+                if drude2 is not None:
+                    bondIndices.append((atom1, drude2))
+        nonbonded = [f for f in sys.getForces() if isinstance(f, mm.CustomNonbondedForce)][0]
+        nonbonded.createExclusionsFromBonds(bondIndices, self.bondCutoff)
+
+parsers["CustomNonbondedForce"] = CustomNonbondedGenerator.parseElement
+
+
 ## @private
 class CustomGBGenerator:
     """A CustomGBGenerator constructs a CustomGBForce."""
@@ -1493,7 +1591,6 @@ class CustomGBGenerator:
         self.typeMap = {}
         self.globalParams = {}
         self.perParticleParams = []
-        self.paramValues = []
         self.computedValues = []
         self.energyTerms = []
         self.functions = []
@@ -2517,9 +2614,10 @@ class AmoebaTorsionTorsionGenerator:
                 gridRow.append(float(gridEntry.attrib['angle1']))
                 gridRow.append(float(gridEntry.attrib['angle2']))
                 gridRow.append(float(gridEntry.attrib['f']))
-                gridRow.append(float(gridEntry.attrib['fx']))
-                gridRow.append(float(gridEntry.attrib['fy']))
-                gridRow.append(float(gridEntry.attrib['fxy']))
+                if 'fx' in gridEntry.attrib:
+                    gridRow.append(float(gridEntry.attrib['fx']))
+                    gridRow.append(float(gridEntry.attrib['fy']))
+                    gridRow.append(float(gridEntry.attrib['fxy']))
                 gridCol.append(gridRow)
 
                 gridColIndex  += 1

wrappers/python/simtk/openmm/app/gromacstopfile.py

@@ -6,7 +6,7 @@ Simbios, the NIH National Center for Physics-Based Simulation of
 Biological Structures at Stanford, funded under the NIH Roadmap for
 Medical Research, grant U54 GM072970. See https://simtk.org.
 
-Portions copyright (c) 2012-2013 Stanford University and the Authors.
+Portions copyright (c) 2012-2014 Stanford University and the Authors.
 Authors: Peter Eastman
 Contributors:
 
@@ -745,6 +745,12 @@ class GromacsTopFile(object):
                     atom1params = nb.getParticleParameters(baseAtomIndex+atoms[0])
                     atom2params = nb.getParticleParameters(baseAtomIndex+atoms[1])
                     exceptions.append((baseAtomIndex+atoms[0], baseAtomIndex+atoms[1], atom1params[0]*atom2params[0]*fudgeQQ, params[0], params[1]))
+                for fields in moleculeType.exclusions:
+                    atoms = [int(x)-1 for x in fields]
+                    for atom in atoms[1:]:
+                        if atom > atoms[0]:
+                            exceptions.append((baseAtomIndex+atoms[0], baseAtomIndex+atom, 0, 0, 0))
+                    
 
         # Create nonbonded exceptions.
 

wrappers/python/simtk/openmm/app/internal/charmm/topologyobjects.py

@@ -421,8 +421,10 @@ class ResidueList(list):
         if self._last_residue is None:
             res = self._last_residue = Residue(resname, resnum)
             list.append(self, res)
-        elif self._last_residue != (resname, resnum):
-            if self._last_residue.idx == resnum:
+        elif (self._last_residue != (resname, resnum) or
+              system != self._last_residue.system):
+            if (self._last_residue.idx == resnum and
+                system == self._last_residue.system):
                 lresname = self._last_residue.resname
                 warnings.warn('Residue %d split into separate residues %s '
                               'and %s' % (resnum, lresname, resname),
@@ -1063,7 +1065,6 @@ class TrackedList(list):
     __delitem__ = _tracking(list.__delitem__)
     append = _tracking(list.append)
     extend = _tracking(list.extend)
-    __delslice__ = _tracking(list.__delslice__)
     __setitem__ = _tracking(list.__setitem__)
 
 # ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

wrappers/python/simtk/openmm/app/modeller.py

@@ -263,7 +263,7 @@ class Modeller(object):
          - positiveIon (string='Na+') the type of positive ion to add.  Allowed values are 'Cs+', 'K+', 'Li+', 'Na+', and 'Rb+'
          - negativeIon (string='Cl-') the type of negative ion to add.  Allowed values are 'Cl-', 'Br-', 'F-', and 'I-'. Be aware
            that not all force fields support all ion types.
-         - ionicString (concentration=0*molar) the total concentration of ions (both positive and negative) to add.  This
+         - ionicStrength (concentration=0*molar) the total concentration of ions (both positive and negative) to add.  This
            does not include ions that are added to neutralize the system.
         """
         # Pick a unit cell size.
@@ -952,14 +952,14 @@ class Modeller(object):
                                     # This is a virtual site.  Compute its position by the correct rule.
 
                                     if site.type == 'average2':
-                                        position = site.weights[0]*templateAtomPositions[index+site.atoms[0]] + site.weights[1]*templateAtomPositions[index+site.atoms[1]]
+                                        position = site.weights[0]*templateAtomPositions[site.atoms[0]] + site.weights[1]*templateAtomPositions[site.atoms[1]]
                                     elif site.type == 'average3':
-                                        position = site.weights[0]*templateAtomPositions[index+site.atoms[0]] + site.weights[1]*templateAtomPositions[index+site.atoms[1]] + site.weights[2]*templateAtomPositions[index+site.atoms[2]]
+                                        position = site.weights[0]*templateAtomPositions[site.atoms[0]] + site.weights[1]*templateAtomPositions[site.atoms[1]] + site.weights[2]*templateAtomPositions[site.atoms[2]]
                                     elif site.type == 'outOfPlane':
-                                        v1 = templateAtomPositions[index+site.atoms[1]] - templateAtomPositions[index+site.atoms[0]]
-                                        v2 = templateAtomPositions[index+site.atoms[2]] - templateAtomPositions[index+site.atoms[0]]
+                                        v1 = templateAtomPositions[site.atoms[1]] - templateAtomPositions[site.atoms[0]]
+                                        v2 = templateAtomPositions[site.atoms[2]] - templateAtomPositions[site.atoms[0]]
                                         cross = Vec3(v1[1]*v2[2]-v1[2]*v2[1], v1[2]*v2[0]-v1[0]*v2[2], v1[0]*v2[1]-v1[1]*v2[0])
-                                        position = templateAtomPositions[index+site.atoms[0]] + site.weights[0]*v1 + site.weights[1]*v2 + site.weights[2]*cross
+                                        position = templateAtomPositions[site.atoms[0]] + site.weights[0]*v1 + site.weights[1]*v2 + site.weights[2]*cross
                             if position is None and atom.type in drudeTypeMap:
                                 # This is a Drude particle.  Put it on top of its parent atom.
 

wrappers/python/src/swig_doxygen/swigInputConfig.py

@@ -272,7 +272,7 @@ UNITS = {
 ("AmoebaPiTorsionForce",                  "getPiTorsionParameters")                        :  ( None, (None, None, None, None, None,  None, 'unit.kilojoule_per_mole')),
 
 ("AmoebaStretchBendForce",                "getNumStretchBends")                            :  ( None, ()),
-("AmoebaStretchBendForce",                "getStretchBendParameters")                      :  ( None, (None, None, None, 'unit.nanometer', 'unit.nanometer', 'unit.radian', 'unit.kilojoule_per_mole/unit.nanometer')),
+("AmoebaStretchBendForce",                "getStretchBendParameters")                      :  ( None, (None, None, None, 'unit.nanometer', 'unit.nanometer', 'unit.radian', 'unit.kilojoule_per_mole/unit.nanometer/unit.degree')),
 
 ("AmoebaTorsionTorsionForce",             "getNumTorsionTorsions")                         :  ( None, ()),
 ("AmoebaTorsionTorsionForce",             "getNumTorsionTorsionGrids")                     :  ( None, ()),