Charmm parameters writer #848
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| Parmed stores rmin/2 in "rmin" | ||
| """ | ||
| unit_system = LAMMPS_UnitSystems("real") # ang, kcal/mol, amu |
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Do we need to make sure we're using this everywhere we write out parameters? I see we use it for the atom mass, but not anywhere else.
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Yep, for in order to handle any input unyts this will do the filtering. I was just too lazy to do it every time at first. Was wondering if you think we should make a system that isn't specific to LAMMPS for this one. It is the exact same as the real units, but maybe a touch confusing to copy them across to other engines. What do you think?
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I wonder if unit_system should be a parameter of write_prm that defaults to None. If nothing is passed, then all units are used as-is from the toplogy? If we set unit_system = topology.unit_system as default behavior, would that work as well?
def write_prm(topology, filename, unit_system=None):
if not unit_system:
unit_system = topology.unit_system
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The PRM file looks to me like it has default assumed units of kCal/mol, angstrom, amu, radians, etc for it's units. So it can only convert to one defined system.
gmso/formats/prm_writer.py
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| f.write("\nNONBONDED\n") | ||
| nonbonded14 = topology.scaling_factors[0][2] |
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This doesn't need to be fixed here, but I feel like this attribute should be more readable rather than just knowing that 0th index is LJ and 1st index is electrostatics. Maybe a dict? I can open a separate issue.
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Was thinking the same thing myself. I think it should also be {"electrostatics":{"1-4":0.5}}, instead of a fixed list. Could potentially be some odd 1-5 interactions at some point.
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Yeah, that's sort of what I was thinking as well.
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Cool. Thanks @chrisjonesBSU, yeah I'll punch those in this week to get this writer off the ground. I'm not sure it gets a lot of use, but it'll be nice to have. |
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| # if key not in uniqueTypesDict: | ||
| # sigma | ||
| # epsilon | ||
| # name | ||
| # mass |
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Commented-out code Note
| # else: | ||
| # vals = uniqueTypesDict[key] |
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Commented-out code Note
Port over the old CHARMM/NAMD .prm file writer from mBuild to GMSO. Adding to the savers and allowing for basic charmm style potentials to be written only.
TODOS: