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December 2, 2021 20:11
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| from __future__ import print_function | |
| from simtk.openmm import app | |
| import simtk.openmm as mm | |
| from simtk import unit | |
| from sys import stdout | |
| import parmed | |
| import sys | |
| import simtk.unit as units | |
| from MDAnalysis.coordinates.DCD import DCDFile | |
| #https://github.com/jeff231li/random-scripts/blob/f4088c855dbe900341b950a9c217e0e575e8c585/python/extract_colvar_openmm.py | |
| #https://github.com/ajkluber/simulation/blob/6ac4ff03da04b13dfc79b3ae80810e1273196ab0/openmm/additional_reporters.py | |
| import simtk.unit as unit | |
| class ForceReporter(object): | |
| def __init__(self, filename, reportInterval): | |
| self._out = open(filename, 'w') | |
| self._reportInterval = reportInterval | |
| def __del__(self): | |
| self._out.close() | |
| def describeNextReport(self, simulation): | |
| steps = self._reportInterval - simulation.currentStep%self._reportInterval | |
| return (steps, False, False, True, False, None) | |
| def report(self, simulation, state): | |
| forces = state.getForces().value_in_unit(unit.kilojoules/unit.mole/unit.nanometer) | |
| f_string = "" | |
| for f in forces: | |
| #f_string += '%g %g %g ' % (f[0], f[1], f[2]) | |
| f_string += '{:>10.2f} {:>10.3f} {:>10.3f} '.format(f[0], f[1], f[2]) | |
| f_string = f_string[:-1] + '\n' | |
| self._out.write(f_string) | |
| sys.stdout.flush() | |
| dms = app.DesmondDMSFile('out.dms') | |
| system = dms.createSystem(nonbondedMethod=app.PME, | |
| nonbondedCutoff=9.0*unit.angstroms,OPLS=True,removeCMMotion=False) | |
| import simtk.openmm as openmm | |
| system.addForce(openmm.MonteCarloBarostat(1 * units.bar, 300*unit.kelvin)) | |
| for i, f in enumerate(system.getForces()): | |
| f.setForceGroup(i) | |
| integrator = mm.LangevinIntegrator(300*unit.kelvin, 1.0/unit.picoseconds, | |
| 2.0*unit.femtoseconds) | |
| integrator.setConstraintTolerance(0.00001) | |
| platform = mm.Platform.getPlatformByName('CUDA') | |
| properties = {'CudaPrecision': 'single'} | |
| simulation = app.Simulation(dms.topology, system, integrator, platform, | |
| properties) | |
| import mdtraj as md | |
| a=md.load('a.dcd', top='a.pdb') | |
| index1=0 | |
| import numpy as np | |
| with DCDFile("a.dcd") as dcd: | |
| header = dcd.header | |
| for frame in dcd.readframes()[0]: | |
| simulation.context.setPeriodicBoxVectors(a=a.unitcell_vectors[index1][0],b=a.unitcell_vectors[index1][1],c=a.unitcell_vectors[index1][2]) | |
| simulation.context.setPositions(frame * unit.angstrom)# | |
| state = simulation.context.getState(getForces=True,getEnergy=True) | |
| positions = state.getForces(asNumpy=True) | |
| print(state.getPeriodicBoxVectors()) | |
| print(state.getPotentialEnergy()/unit.kilocalories_per_mole) | |
| index1=index1+1 | |
| for i, f in enumerate(system.getForces()): | |
| state = simulation.context.getState(getEnergy=True, groups={i}) | |
| print(f.__class__, state.getPotentialEnergy()/unit.kilocalories_per_mole) |
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