659 lines
58 KiB
HTML
659 lines
58 KiB
HTML
<!DOCTYPE html>
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<html class="writer-html5" lang="en" >
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<title>fix move command — LAMMPS documentation</title>
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<link rel="canonical" href="https://docs.lammps.org/fix_move.html" />
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<link rel="index" title="Index" href="genindex.html" />
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<link rel="search" title="Search" href="search.html" />
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<link rel="next" title="fix msst command" href="fix_msst.html" />
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<img src="_static/lammps-logo.png" class="logo" alt="Logo"/>
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</a>
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<div class="lammps_version">Version: <b>19 Nov 2024</b></div>
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<div class="lammps_release">git info: </div>
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</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
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<p class="caption" role="heading"><span class="caption-text">User Guide</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="Intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Install.html">2. Install LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Build.html">3. Build LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Run_head.html">4. Run LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Commands.html">5. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Packages.html">6. Optional packages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Speed.html">7. Accelerate performance</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Howto.html">8. Howto discussions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Examples.html">9. Example scripts</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Tools.html">10. Auxiliary tools</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Errors.html">11. Errors</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">Programmer Guide</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Python_head.html">2. Use Python with LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Modify.html">3. Modifying & extending LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Developer.html">4. Information for Developers</a></li>
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</ul>
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<p class="caption" role="heading"><span class="caption-text">Command Reference</span></p>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="commands_list.html">Commands</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="fixes.html">Fix Styles</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="fix_accelerate_cos.html">fix accelerate/cos command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_acks2_reaxff.html">fix acks2/reaxff command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_adapt.html">fix adapt command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_adapt_fep.html">fix adapt/fep command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_add_heat.html">fix add/heat command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_addforce.html">fix addforce command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_addtorque.html">fix addtorque command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_alchemy.html">fix alchemy command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_amoeba_bitorsion.html">fix amoeba/bitorsion command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_amoeba_pitorsion.html">fix amoeba/pitorsion command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_append_atoms.html">fix append/atoms command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_atc.html">fix atc command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_atom_swap.html">fix atom/swap command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_atom.html">fix ave/atom command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_chunk.html">fix ave/chunk command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_correlate.html">fix ave/correlate command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_correlate_long.html">fix ave/correlate/long command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_grid.html">fix ave/grid command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_histo.html">fix ave/histo command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_histo.html#fix-ave-histo-weight-command">fix ave/histo/weight command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_spatial.html">fix ave/spatial command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_spatial_sphere.html">fix ave/spatial/sphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ave_time.html">fix ave/time command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_aveforce.html">fix aveforce command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_balance.html">fix balance command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bocs.html">fix bocs command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bond_break.html">fix bond/break command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bond_create.html">fix bond/create command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bond_create.html#fix-bond-create-angle-command">fix bond/create/angle command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bond_react.html">fix bond/react command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_bond_swap.html">fix bond/swap command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_box_relax.html">fix box/relax command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_brownian.html">fix brownian command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_brownian.html#fix-brownian-sphere-command">fix brownian/sphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_brownian.html#fix-brownian-asphere-command">fix brownian/asphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_charge_regulation.html">fix charge/regulation command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_cmap.html">fix cmap command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_colvars.html">fix colvars command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_controller.html">fix controller command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_damping_cundall.html">fix damping/cundall command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_deform.html">fix deform command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_deform_pressure.html">fix deform/pressure command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_deposit.html">fix deposit command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_dpd_energy.html">fix dpd/energy command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_dpd_source.html">fix edpd/source command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_dpd_source.html#fix-tdpd-source-command">fix tdpd/source command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_drag.html">fix drag command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_drude.html">fix drude command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_drude_transform.html">fix drude/transform/direct command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_drude_transform.html#fix-drude-transform-inverse-command">fix drude/transform/inverse command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_dt_reset.html">fix dt/reset command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_efield.html">fix efield command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_efield.html#fix-efield-tip4p-command">fix efield/tip4p command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ehex.html">fix ehex command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_electrode.html">fix electrode/conp command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_electrode.html#fix-electrode-conq-command">fix electrode/conq command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_electrode.html#fix-electrode-thermo-command">fix electrode/thermo command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_electron_stopping.html">fix electron/stopping command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_electron_stopping.html#fix-electron-stopping-fit-command">fix electron/stopping/fit command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_enforce2d.html">fix enforce2d command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_eos_cv.html">fix eos/cv command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_eos_table.html">fix eos/table command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_eos_table_rx.html">fix eos/table/rx command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_evaporate.html">fix evaporate command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_external.html">fix external command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ffl.html">fix ffl command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_filter_corotate.html">fix filter/corotate command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_flow_gauss.html">fix flow/gauss command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_freeze.html">fix freeze command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_gcmc.html">fix gcmc command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_gld.html">fix gld command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_gle.html">fix gle command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_gravity.html">fix gravity command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_grem.html">fix grem command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_halt.html">fix halt command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_heat.html">fix heat command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_heat_flow.html">fix heat/flow command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_hyper_global.html">fix hyper/global command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_hyper_local.html">fix hyper/local command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_imd.html">fix imd command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_indent.html">fix indent command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_ipi.html">fix ipi command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_langevin.html">fix langevin command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_langevin_drude.html">fix langevin/drude command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_langevin_eff.html">fix langevin/eff command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_langevin_spin.html">fix langevin/spin command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_lb_fluid.html">fix lb/fluid command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_lb_momentum.html">fix lb/momentum command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_lb_viscous.html">fix lb/viscous command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_lineforce.html">fix lineforce command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_manifoldforce.html">fix manifoldforce command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mdi_qm.html">fix mdi/qm command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mdi_qmmm.html">fix mdi/qmmm command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_meso_move.html">fix meso/move command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mol_swap.html">fix mol/swap command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_momentum.html">fix momentum command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_momentum.html#fix-momentum-chunk-command">fix momentum/chunk command</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">fix move command</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#syntax">Syntax</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#examples">Examples</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#description">Description</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#restart-fix-modify-output-run-start-stop-minimize-info">Restart, fix_modify, output, run start/stop, minimize info</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#restrictions">Restrictions</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#related-commands">Related commands</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#default">Default</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="fix_msst.html">fix msst command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mvv_dpd.html">fix mvv/dpd command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mvv_dpd.html#fix-mvv-edpd-command">fix mvv/edpd command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_mvv_dpd.html#fix-mvv-tdpd-command">fix mvv/tdpd command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_neb.html">fix neb command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_neb_spin.html">fix neb/spin command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh.html">fix nvt command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh.html#fix-npt-command">fix npt command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh.html#fix-nph-command">fix nph command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh_eff.html">fix nvt/eff command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh_eff.html#fix-npt-eff-command">fix npt/eff command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh_eff.html#fix-nph-eff-command">fix nph/eff command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh_uef.html">fix nvt/uef command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nh_uef.html#fix-npt-uef-command">fix npt/uef command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nonaffine_displacement.html">fix nonaffine/displacement command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nph_asphere.html">fix nph/asphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nph_body.html">fix nph/body command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nph_sphere.html">fix nph/sphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_nphug.html">fix nphug command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_npt_asphere.html">fix npt/asphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_npt_body.html">fix npt/body command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_npt_cauchy.html">fix npt/cauchy command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_npt_sphere.html">fix npt/sphere command</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fix_numdiff.html">fix numdiff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_numdiff_virial.html">fix numdiff/virial command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve.html">fix nve command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_asphere.html">fix nve/asphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_asphere_noforce.html">fix nve/asphere/noforce command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_awpmd.html">fix nve/awpmd command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_body.html">fix nve/body command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_bpm_sphere.html">fix nve/bpm/sphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_dot.html">fix nve/dot command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_dotc_langevin.html">fix nve/dotc/langevin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_eff.html">fix nve/eff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_limit.html">fix nve/limit command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_line.html">fix nve/line command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_manifold_rattle.html">fix nve/manifold/rattle command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_noforce.html">fix nve/noforce command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_sphere.html">fix nve/sphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_spin.html">fix nve/spin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nve_tri.html">fix nve/tri command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvk.html">fix nvk command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_asphere.html">fix nvt/asphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_body.html">fix nvt/body command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_manifold_rattle.html">fix nvt/manifold/rattle command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_sllod.html">fix nvt/sllod command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_sllod_eff.html">fix nvt/sllod/eff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_nvt_sphere.html">fix nvt/sphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_oneway.html">fix oneway command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_orient.html">fix orient/fcc command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_orient.html#fix-orient-bcc-command">fix orient/bcc command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_orient_eco.html">fix orient/eco command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pafi.html">fix pafi command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pair.html">fix pair command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_phonon.html">fix phonon command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pimd.html">fix pimd/langevin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pimd.html#fix-pimd-nvt-command">fix pimd/nvt command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pimdb.html">fix pimdb/langevin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pimdb.html#fix-pimdb-nvt-command">fix pimdb/nvt command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_planeforce.html">fix planeforce command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_plumed.html">fix plumed command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_poems.html">fix poems command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_polarize.html">fix polarize/bem/gmres command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_polarize.html#fix-polarize-bem-icc-command">fix polarize/bem/icc command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_polarize.html#fix-polarize-functional-command">fix polarize/functional command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_pour.html">fix pour command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_precession_spin.html">fix precession/spin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_press_berendsen.html">fix press/berendsen command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_press_langevin.html">fix press/langevin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_print.html">fix print command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_propel_self.html">fix propel/self command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_property_atom.html">fix property/atom command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_python_invoke.html">fix python/invoke command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_python_move.html">fix python/move command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qbmsst.html">fix qbmsst command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html">fix qeq/point command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html#fix-qeq-shielded-command">fix qeq/shielded command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html#fix-qeq-slater-command">fix qeq/slater command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html#fix-qeq-ctip-command">fix qeq/ctip command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html#fix-qeq-dynamic-command">fix qeq/dynamic command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq.html#fix-qeq-fire-command">fix qeq/fire command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq_comb.html">fix qeq/comb command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qeq_reaxff.html">fix qeq/reaxff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qmmm.html">fix qmmm command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qtb.html">fix qtb command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_qtpie_reaxff.html">fix qtpie/reaxff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_reaxff_bonds.html">fix reaxff/bonds command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_reaxff_species.html">fix reaxff/species command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_recenter.html">fix recenter command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_restrain.html">fix restrain command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rheo.html">fix rheo command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rheo_oxidation.html">fix rheo/oxidation command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rheo_pressure.html">fix rheo/pressure command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rheo_thermal.html">fix rheo/thermal command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rheo_viscosity.html">fix rheo/viscosity command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rhok.html">fix rhok command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html">fix rigid command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nve-command">fix rigid/nve command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nvt-command">fix rigid/nvt command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-npt-command">fix rigid/npt command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nph-command">fix rigid/nph command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-small-command">fix rigid/small command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nve-small-command">fix rigid/nve/small command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nvt-small-command">fix rigid/nvt/small command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-npt-small-command">fix rigid/npt/small command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid.html#fix-rigid-nph-small-command">fix rigid/nph/small command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rigid_meso.html">fix rigid/meso command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_rx.html">fix rx command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_saed_vtk.html">fix saed/vtk command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_setforce.html">fix setforce command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_setforce.html#fix-setforce-spin-command">fix setforce/spin command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_sgcmc.html">fix sgcmc command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_shake.html">fix shake command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_shake.html#fix-rattle-command">fix rattle command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_shardlow.html">fix shardlow command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd.html">fix smd command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_adjust_dt.html">fix smd/adjust_dt command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_integrate_tlsph.html">fix smd/integrate_tlsph command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_integrate_ulsph.html">fix smd/integrate_ulsph command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_move_triangulated_surface.html">fix smd/move_tri_surf command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_setvel.html">fix smd/setvel command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_smd_wall_surface.html">fix smd/wall_surface command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_sph.html">fix sph command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_sph_stationary.html">fix sph/stationary command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_spring.html">fix spring command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_spring_chunk.html">fix spring/chunk command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_spring_rg.html">fix spring/rg command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_spring_self.html">fix spring/self command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_srd.html">fix srd command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_store_force.html">fix store/force command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_store_state.html">fix store/state command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_temp_berendsen.html">fix temp/berendsen command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_temp_csvr.html">fix temp/csvr command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_temp_csvr.html#fix-temp-csld-command">fix temp/csld command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_temp_rescale.html">fix temp/rescale command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_temp_rescale_eff.html">fix temp/rescale/eff command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_tfmc.html">fix tfmc command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_tgnh_drude.html">fix tgnvt/drude command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_tgnh_drude.html#fix-tgnpt-drude-command">fix tgnpt/drude command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_thermal_conductivity.html">fix thermal/conductivity command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_ti_spring.html">fix ti/spring command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_tmd.html">fix tmd command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_ttm.html">fix ttm command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_ttm.html#fix-ttm-grid-command">fix ttm/grid command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_ttm.html#fix-ttm-mod-command">fix ttm/mod command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_tune_kspace.html">fix tune/kspace command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_vector.html">fix vector command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_viscosity.html">fix viscosity command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_viscous.html">fix viscous command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_viscous_sphere.html">fix viscous/sphere command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html">fix wall/lj93 command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-lj126-command">fix wall/lj126 command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-lj1043-command">fix wall/lj1043 command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-colloid-command">fix wall/colloid command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-harmonic-command">fix wall/harmonic command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-lepton-command">fix wall/lepton command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-morse-command">fix wall/morse command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall.html#fix-wall-table-command">fix wall/table command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_body_polygon.html">fix wall/body/polygon command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_body_polyhedron.html">fix wall/body/polyhedron command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_ees.html">fix wall/ees command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_ees.html#fix-wall-region-ees-command">fix wall/region/ees command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_flow.html">fix wall/flow command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_gran.html">fix wall/gran command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_gran_region.html">fix wall/gran/region command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_piston.html">fix wall/piston command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_reflect.html">fix wall/reflect command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_reflect_stochastic.html">fix wall/reflect/stochastic command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_region.html">fix wall/region command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_wall_srd.html">fix wall/srd command</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="fix_widom.html">fix widom command</a></li>
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1"><a class="reference internal" href="computes.html">Compute Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="pairs.html">Pair Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="bonds.html">Bond Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="angles.html">Angle Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="dihedrals.html">Dihedral Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="impropers.html">Improper Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="dumps.html">Dump Styles</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="fix_modify_atc_commands.html">fix_modify AtC commands</a></li>
|
||
<li class="toctree-l1"><a class="reference internal" href="Bibliography.html">Bibliography</a></li>
|
||
</ul>
|
||
|
||
</div>
|
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</div>
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<li><a href="Manual.html" class="icon icon-home" aria-label="Home"></a></li>
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<li class="breadcrumb-item"><a href="fixes.html">Fix Styles</a></li>
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<li class="breadcrumb-item active">fix move command</li>
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<li class="wy-breadcrumbs-aside">
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<a href="https://www.lammps.org"><img src="_static/lammps-logo.png" width="64" height="16" alt="LAMMPS Homepage"></a> | <a href="Commands_all.html">Commands</a>
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</ul><div class="rst-breadcrumbs-buttons" role="navigation" aria-label="Sequential page navigation">
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|
||
</div>
|
||
<hr/>
|
||
</div>
|
||
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
|
||
<div itemprop="articleBody">
|
||
|
||
<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
|
||
<section id="fix-move-command">
|
||
<span id="index-0"></span><h1>fix move command<a class="headerlink" href="#fix-move-command" title="Link to this heading"></a></h1>
|
||
<section id="syntax">
|
||
<h2>Syntax<a class="headerlink" href="#syntax" title="Link to this heading"></a></h2>
|
||
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">fix </span><span class="nv nv-Identifier">ID</span><span class="w"> </span><span class="nv nv-Identifier">group-ID</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="n">style</span><span class="w"> </span><span class="n">args</span><span class="w"> </span><span class="n">keyword</span><span class="w"> </span><span class="n">values</span><span class="w"> </span><span class="n">...</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul>
|
||
<li><p>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</p></li>
|
||
<li><p>move = style name of this fix command</p></li>
|
||
<li><p>style = <em>linear</em> or <em>wiggle</em> or <em>rotate</em> or <em>transrot</em> or <em>variable</em></p>
|
||
<pre class="literal-block"><em>linear</em> args = Vx Vy Vz
|
||
Vx,Vy,Vz = components of velocity vector (velocity units), any component can be specified as NULL
|
||
<em>wiggle</em> args = Ax Ay Az period
|
||
Ax,Ay,Az = components of amplitude vector (distance units), any component can be specified as NULL
|
||
period = period of oscillation (time units)
|
||
<em>rotate</em> args = Px Py Pz Rx Ry Rz period
|
||
Px,Py,Pz = origin point of axis of rotation (distance units)
|
||
Rx,Ry,Rz = axis of rotation vector
|
||
period = period of rotation (time units)
|
||
<em>transrot</em> args = Vx Vy Vz Px Py Pz Rx Ry Rz period
|
||
Vx,Vy,Vz = components of velocity vector (velocity units)
|
||
Px,Py,Pz = origin point of axis of rotation (distance units)
|
||
Rx,Ry,Rz = axis of rotation vector
|
||
period = period of rotation (time units)
|
||
<em>variable</em> args = v_dx v_dy v_dz v_vx v_vy v_vz
|
||
v_dx,v_dy,v_dz = 3 variable names that calculate x,y,z displacement as function of time, any component can be specified as NULL
|
||
v_vx,v_vy,v_vz = 3 variable names that calculate x,y,z velocity as function of time, any component can be specified as NULL</pre>
|
||
</li>
|
||
<li><p>zero or more keyword/value pairs may be appended</p></li>
|
||
<li><p>keyword = <em>units</em></p>
|
||
<pre class="literal-block"><em>units</em> value = <em>box</em> or <em>lattice</em></pre>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="examples">
|
||
<h2>Examples<a class="headerlink" href="#examples" title="Link to this heading"></a></h2>
|
||
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">fix </span><span class="nv nv-Identifier">1</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="n">wiggle</span><span class="w"> </span><span class="m">3.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">1.0</span><span class="w"> </span><span class="n">units</span><span class="w"> </span><span class="n">box</span>
|
||
<span class="k">fix </span><span class="nv nv-Identifier">2</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="n">rotate</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">1.0</span><span class="w"> </span><span class="m">5.0</span>
|
||
<span class="k">fix </span><span class="nv nv-Identifier">2</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="k">variable </span><span class="nv nv-Identifier">v_myx</span><span class="w"> </span><span class="n">v_myy</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">v_VX</span><span class="w"> </span><span class="n">v_VY</span><span class="w"> </span><span class="n">NULL</span>
|
||
<span class="k">fix </span><span class="nv nv-Identifier">3</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="n">transrot</span><span class="w"> </span><span class="m">0.1</span><span class="w"> </span><span class="m">0.1</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">0.0</span><span class="w"> </span><span class="m">1.0</span><span class="w"> </span><span class="m">5.0</span><span class="w"> </span><span class="n">units</span><span class="w"> </span><span class="n">box</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="description">
|
||
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
|
||
<p>Perform updates of position and velocity for atoms in the group each
|
||
timestep using the specified settings or formulas, without regard to
|
||
forces on the atoms. This can be useful for boundary or other atoms,
|
||
whose movement can influence nearby atoms.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>The atoms affected by this fix should not normally be time integrated
|
||
by other fixes (e.g. <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a>, <a class="reference internal" href="fix_nh.html"><span class="doc">fix nvt</span></a>), since that will change their positions and velocities
|
||
twice.</p>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>As atoms move due to this fix, they will pass through periodic
|
||
boundaries and be remapped to the other side of the simulation box,
|
||
just as they would during normal time integration (e.g. via the
|
||
<a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a> command). It is up to you to decide whether
|
||
periodic boundaries are appropriate with the kind of atom motion you
|
||
are prescribing with this fix.</p>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>As discussed below, atoms are moved relative to their initial
|
||
position at the time the fix is specified. These initial coordinates
|
||
are stored by the fix in “unwrapped” form, by using the image flags
|
||
associated with each atom. See the <a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a> command
|
||
for a discussion of “unwrapped” coordinates. See the Atoms section
|
||
of the <a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> command for a discussion of image
|
||
flags and how they are set for each atom. You can reset the image
|
||
flags (e.g. to 0) before invoking this fix by using the <a class="reference internal" href="set.html"><span class="doc">set
|
||
image</span></a> command.</p>
|
||
</div>
|
||
<hr class="docutils" />
|
||
<p>The <em>linear</em> style moves atoms at a constant velocity, so that their
|
||
position <em>X</em> = (x,y,z) as a function of time is given in vector
|
||
notation as</p>
|
||
<pre class="literal-block">X(t) = X0 + V * delta</pre>
|
||
<p>where <em>X0</em> = (x0,y0,z0) is their position at the time the fix is
|
||
specified, <em>V</em> is the specified velocity vector with components
|
||
(Vx,Vy,Vz), and <em>delta</em> is the time elapsed since the fix was
|
||
specified. This style also sets the velocity of each atom to V =
|
||
(Vx,Vy,Vz). If any of the velocity components is specified as NULL,
|
||
then the position and velocity of that component is time integrated
|
||
the same as the <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a> command would perform, using
|
||
the corresponding force component on the atom.</p>
|
||
<p>Note that the <em>linear</em> style is identical to using the <em>variable</em>
|
||
style with an <a class="reference internal" href="variable.html"><span class="doc">equal-style variable</span></a> that uses the
|
||
vdisplace() function. E.g.</p>
|
||
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">variable </span><span class="nv nv-Identifier">V</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="m">10.0</span>
|
||
<span class="k">variable </span><span class="nv nv-Identifier">x</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="n">vdisplace</span><span class="nv">(0.0,$V)</span>
|
||
<span class="k">fix </span><span class="nv nv-Identifier">1</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="k">variable </span><span class="nv nv-Identifier">v_x</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">v_V</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">NULL</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The <em>wiggle</em> style moves atoms in an oscillatory fashion, so that
|
||
their position <em>X</em> = (x,y,z) as a function of time is given in vector
|
||
notation as</p>
|
||
<pre class="literal-block">X(t) = X0 + A sin(omega*delta)</pre>
|
||
<p>where <em>X0</em> = (x0,y0,z0) is their position at the time the fix is
|
||
specified, <em>A</em> is the specified amplitude vector with components
|
||
(Ax,Ay,Az), <em>omega</em> is 2 PI / <em>period</em>, and <em>delta</em> is the time elapsed
|
||
since the fix was specified. This style also sets the velocity of each
|
||
atom to the time derivative of this expression. If any of the amplitude
|
||
components is specified as NULL, then the position and velocity of that
|
||
component is time integrated the same as the <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a>
|
||
command would perform, using the corresponding force component on the
|
||
atom.</p>
|
||
<p>Note that the <em>wiggle</em> style is identical to using the <em>variable</em>
|
||
style with <a class="reference internal" href="variable.html"><span class="doc">equal-style variables</span></a> that use the
|
||
swiggle() and cwiggle() functions. E.g.</p>
|
||
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">variable </span><span class="nv nv-Identifier">A</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="m">10.0</span>
|
||
<span class="k">variable </span><span class="nv nv-Identifier">T</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="m">5.0</span>
|
||
<span class="k">variable </span><span class="nv nv-Identifier">omega</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="m">2.0</span><span class="o">*</span><span class="n">PI</span><span class="o">/</span><span class="nv">$T</span>
|
||
<span class="k">variable </span><span class="nv nv-Identifier">x</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="n">swiggle</span><span class="nv">(0.0,$A,$T)</span>
|
||
<span class="k">variable </span><span class="nv nv-Identifier">v</span><span class="w"> </span><span class="n">equal</span><span class="w"> </span><span class="n">v_omega</span><span class="o">*</span><span class="nv">($A-cwiggle(0.0,$A,$T))</span>
|
||
<span class="k">fix </span><span class="nv nv-Identifier">1</span><span class="w"> </span><span class="nv nv-Identifier">boundary</span><span class="w"> </span><span class="n">move</span><span class="w"> </span><span class="k">variable </span><span class="nv nv-Identifier">v_x</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">v_v</span><span class="w"> </span><span class="n">NULL</span><span class="w"> </span><span class="n">NULL</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The <em>rotate</em> style rotates atoms around a rotation axis <em>R</em> = (Rx,Ry,Rz)
|
||
that goes through a point <em>P</em> = (Px,Py,Pz). The <em>period</em> of the
|
||
rotation is also specified. The direction of rotation for the atoms
|
||
around the rotation axis is consistent with the right-hand rule: if your
|
||
right-hand thumb points along <em>R</em>, then your fingers wrap around the
|
||
axis in the direction of rotation.</p>
|
||
<p>This style also sets the velocity of each atom to (omega cross Rperp)
|
||
where omega is its angular velocity around the rotation axis and Rperp
|
||
is a perpendicular vector from the rotation axis to the atom. If the
|
||
defined <a class="reference internal" href="atom_style.html"><span class="doc">atom_style</span></a> assigns an angular velocity or
|
||
angular momentum or orientation to each atom (<a class="reference internal" href="atom_style.html"><span class="doc">atom styles</span></a> sphere, ellipsoid, line, tri, body), then
|
||
those properties are also updated appropriately to correspond to the
|
||
atom’s motion and rotation over time.</p>
|
||
<p>The <em>transrot</em> style combines the effects of <em>rotate</em> and <em>linear</em> so
|
||
that it is possible to prescribe a rotating group of atoms that also
|
||
moves at a constant velocity. The arguments are for the translation
|
||
first and then for the rotation. Since the rotation affects all
|
||
coordinate components, it is not possible to set any of the
|
||
translation vector components to NULL.</p>
|
||
<p>The <em>variable</em> style allows the position and velocity components of
|
||
each atom to be set by formulas specified via the
|
||
<a class="reference internal" href="variable.html"><span class="doc">variable</span></a> command. Each of the 6 variables is
|
||
specified as an argument to the fix as v_name, where name is the
|
||
variable name that is defined elsewhere in the input script.</p>
|
||
<p>Each variable must be of either the <em>equal</em> or <em>atom</em> style.
|
||
<em>Equal</em>-style variables compute a single numeric quantity, that can be
|
||
a function of the timestep as well as of other simulation values.
|
||
<em>Atom</em>-style variables compute a numeric quantity for each atom, that
|
||
can be a function per-atom quantities, such as the atom’s position, as
|
||
well as of the timestep and other simulation values. Note that this fix
|
||
stores the original coordinates of each atom (see note below) so that
|
||
per-atom quantity can be used in an atom-style variable formula. See
|
||
the <a class="reference internal" href="variable.html"><span class="doc">variable</span></a> command for details.</p>
|
||
<p>The first 3 variables (v_dx,v_dy,v_dz) specified for the <em>variable</em>
|
||
style are used to calculate a displacement from the atom’s original
|
||
position at the time the fix was specified. The second 3 variables
|
||
(v_vx,v_vy,v_vz) specified are used to compute a velocity for each
|
||
atom.</p>
|
||
<p>Any of the 6 variables can be specified as NULL. If both the
|
||
displacement and velocity variables for a particular x,y,z component
|
||
are specified as NULL, then the position and velocity of that
|
||
component is time integrated the same as the <a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a>
|
||
command would perform, using the corresponding force component on the
|
||
atom. If only the velocity variable for a component is specified as
|
||
NULL, then the displacement variable will be used to set the position
|
||
of the atom, and its velocity component will not be changed. If only
|
||
the displacement variable for a component is specified as NULL, then
|
||
the velocity variable will be used to set the velocity of the atom,
|
||
and the position of the atom will be time integrated using that
|
||
velocity.</p>
|
||
<p>The <em>units</em> keyword determines the meaning of the distance units used
|
||
to define the <em>linear</em> velocity and <em>wiggle</em> amplitude and <em>rotate</em>
|
||
origin. This setting is ignored for the <em>variable</em> style. A <em>box</em>
|
||
value selects standard units as defined by the <a class="reference internal" href="units.html"><span class="doc">units</span></a>
|
||
command, e.g. velocity in Angstroms/fs and amplitude and position
|
||
in Angstroms for units = real. A <em>lattice</em> value means the velocity
|
||
units are in lattice spacings per time and the amplitude and position
|
||
are in lattice spacings. The <a class="reference internal" href="lattice.html"><span class="doc">lattice</span></a> command must have
|
||
been previously used to define the lattice spacing. Each of these 3
|
||
quantities may be dependent on the x,y,z dimension, since the lattice
|
||
spacings can be different in x,y,z.</p>
|
||
</section>
|
||
<hr class="docutils" />
|
||
<section id="restart-fix-modify-output-run-start-stop-minimize-info">
|
||
<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Link to this heading"></a></h2>
|
||
<p>This fix writes the original coordinates of moving atoms to <a class="reference internal" href="restart.html"><span class="doc">binary
|
||
restart files</span></a>, as well as the initial timestep, so that the
|
||
motion can be continuous in a restarted simulation. See the
|
||
<a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a> command for info on how to re-specify
|
||
a fix in an input script that reads a restart file, so that the
|
||
operation of the fix continues in an uninterrupted fashion.</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>Because the move positions are a function of the current
|
||
timestep and the initial timestep, you cannot reset the timestep to a
|
||
different value after reading a restart file, if you expect a fix move
|
||
command to work in an uninterrupted fashion.</p>
|
||
</div>
|
||
<p>None of the <a class="reference internal" href="fix_modify.html"><span class="doc">fix_modify</span></a> options are relevant to this
|
||
fix.</p>
|
||
<p>This fix produces a per-atom array which can be accessed by various
|
||
<a class="reference internal" href="Howto_output.html"><span class="doc">output commands</span></a>. The number of columns for each
|
||
atom is 3, and the columns store the original unwrapped x,y,z coords of
|
||
each atom. The per-atom values can be accessed on any timestep.</p>
|
||
<p>No parameter of this fix can be used with the <em>start/stop</em> keywords of
|
||
the <a class="reference internal" href="run.html"><span class="doc">run</span></a> command. This fix is not invoked during
|
||
<a class="reference internal" href="minimize.html"><span class="doc">energy minimization</span></a>.</p>
|
||
<p>For <a class="reference internal" href="run_style.html"><span class="doc">rRESPA time integration</span></a>, this fix adjusts the
|
||
position and velocity of atoms on the outermost rRESPA level.</p>
|
||
</section>
|
||
<section id="restrictions">
|
||
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Link to this heading"></a></h2>
|
||
<blockquote>
|
||
<div><p>none</p>
|
||
</div></blockquote>
|
||
</section>
|
||
<section id="related-commands">
|
||
<h2>Related commands<a class="headerlink" href="#related-commands" title="Link to this heading"></a></h2>
|
||
<p><a class="reference internal" href="fix_nve.html"><span class="doc">fix nve</span></a>, <a class="reference internal" href="displace_atoms.html"><span class="doc">displace_atoms</span></a></p>
|
||
</section>
|
||
<section id="default">
|
||
<h2>Default<a class="headerlink" href="#default" title="Link to this heading"></a></h2>
|
||
<p>none</p>
|
||
<p>The option default is units = lattice.</p>
|
||
</section>
|
||
</section>
|
||
|
||
|
||
</div>
|
||
</div>
|
||
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
|
||
<a href="fix_momentum.html" class="btn btn-neutral float-left" title="fix momentum command" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
|
||
<a href="fix_msst.html" class="btn btn-neutral float-right" title="fix msst command" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
|
||
</div>
|
||
|
||
<hr/>
|
||
|
||
<div role="contentinfo">
|
||
<p>© Copyright 2003-2025 Sandia Corporation.</p>
|
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</div>
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