Comments (6)
In mBuild when saving as .hoomdxml, .gsd, and .lammpsdata the save
function is calling internal save_hoomdxml
, save_gsd
, and save_lammpsdata
writers that actually take a ParmEd structure as an argument rather than an mBuild Compound (this conversion is performed within mBuild prior to calling the individual writers). So it should be easy to support saving ParmEd structures in these formats. However, in the long term what we would like to do is to add the save_hoomdxml
, save_gsd
, and save_lammpsdata
functions to ParmEd, so that ParmEd is handling all of the saving. These are only incorporated into mBuild right now because ParmEd does not have writers for these file formats. I'm sure @ctk3b has a vision for how we should handle this in the short term, but it might be time for us to work on actually adding these writers into ParmEd
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I think adding the writers into ParmEd makes the most sense long term but short term would it be easier to copy writing code from mbuild or import the mbuild save_hoomdxml
function?
from foyer.
My mistake, the functions are write_hoomdxml
, write_gsd
, and write_lammpsdata
.
As @mikemhenry suggested, these can be imported by using:
from mbuild.formats.hoomdxml import write_hoomdxml
from mbuild.formats.gsdwriter import write_gsd
from mbuild.formats.lammpsdata import write_lammpsdata
These functions are not currently included in the mBuild documentation, but we have actually been working on updating the documentation today, so I can make sure that soon information is available for those functions so you will know what arguments to pass.
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Thanks! @evanmiller326 and I are presenting mbuild and foyer to our lab today and hoomd is pretty critical to our workflow.
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Okay for now then (since we won't have the docs updated for a bit) it would probably be best to look at the source code for mBuild (in the formats
directory). The writers are pretty well documented there, so that should give you an idea of what arguments you will need to pass to them.
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I'm gonna close this now but for the record the straightforward way to access these writers is with Compound.save
E.g.
ethane.save('ethane.hoomdxml', forcefield_name='oplsaa')
ethane.save('ethane.hoomdxml', forcefield_files='my_ff.xml')
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