text: user15814: How can I do to extract a single frame as a pdb file from a trajectory traj.xtc file, by using MDAnalysis?
  I've got a universe
  u=mda.Universe('confout.gro','traj.xtc')
  Then I selected a residue by doing select_atoms, and I would like to extract a single frame as a pdb file
  
  user16705: Check out gmx_trjconv - this command is in GROMACS and accepts several options where you can specify the specific single frame that you want to output/write - out to the new pdb/gro/xtc file.  https://manual.gromacs.org/current/onlinehelp/gmx-trjconv.html
  
original_text: 15814: <p>How can I do to extract a single frame as a pdb file from a trajectory traj.xtc file, by using MDAnalysis?</p>
  <p>I've got a universe
  u=mda.Universe('confout.gro','traj.xtc')</p>
  <p>Then I selected a residue by doing select_atoms, and I would like to extract a single frame as a pdb file</p>
   16705: <p>Check out gmx_trjconv - this command is in GROMACS and accepts several options where you can specify the specific single frame that you want to output/write - out to the new pdb/gro/xtc file.  <a href="https://manual.gromacs.org/current/onlinehelp/gmx-trjconv.html" rel="nofollow noreferrer">https://manual.gromacs.org/current/onlinehelp/gmx-trjconv.html</a></p>
  