Pulling only one half of a harmonic restraint

From: Miro Astore (miro.astore_at_gmail.com)
Date: Fri Sep 13 2019 - 03:02:44 CDT

Hi all,

I would like to pull on the atoms in group1 but not the ones in group 2.
Help on how to do this would be appreciated. Example Colvar below

colvarsTrajFrequency 500
# Pulling
colvar {
  name Pulled
  outputAppliedForce yes
  distance {
  group1 {
     atomsFile atoms.pdb
     atomsCol O
     atomsColValue 1.0
  }
  group2 {
     atomsFile atoms.pdb
     atomsCol O
     atomsColValue 2.0
   }
  }
}
harmonic {
  colvars Pulled
  centers 34
  targetCenters 4
  targetNumSteps 30000
  forceConstant 4.0
}

Best, Miro

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