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/usr/include/liggghts/fix_ave_atom.h is in libliggghts-dev 3.7.0+repack1-1.

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The actual contents of the file can be viewed below.

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/* ----------------------------------------------------------------------
    This is the

    ██╗     ██╗ ██████╗  ██████╗  ██████╗ ██╗  ██╗████████╗███████╗
    ██║     ██║██╔════╝ ██╔════╝ ██╔════╝ ██║  ██║╚══██╔══╝██╔════╝
    ██║     ██║██║  ███╗██║  ███╗██║  ███╗███████║   ██║   ███████╗
    ██║     ██║██║   ██║██║   ██║██║   ██║██╔══██║   ██║   ╚════██║
    ███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║  ██║   ██║   ███████║
    ╚══════╝╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝®

    DEM simulation engine, released by
    DCS Computing Gmbh, Linz, Austria
    http://www.dcs-computing.com, office@dcs-computing.com

    LIGGGHTS® is part of CFDEM®project:
    http://www.liggghts.com | http://www.cfdem.com

    Core developer and main author:
    Christoph Kloss, christoph.kloss@dcs-computing.com

    LIGGGHTS® is open-source, distributed under the terms of the GNU Public
    License, version 2 or later. It is distributed in the hope that it will
    be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You should have
    received a copy of the GNU General Public License along with LIGGGHTS®.
    If not, see http://www.gnu.org/licenses . See also top-level README
    and LICENSE files.

    LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
    the producer of the LIGGGHTS® software and the CFDEM®coupling software
    See http://www.cfdem.com/terms-trademark-policy for details.

-------------------------------------------------------------------------
    Contributing author and copyright for this file:
    This file is from LAMMPS
    LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
    http://lammps.sandia.gov, Sandia National Laboratories
    Steve Plimpton, sjplimp@sandia.gov

    Copyright (2003) Sandia Corporation.  Under the terms of Contract
    DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
    certain rights in this software.  This software is distributed under
    the GNU General Public License.
------------------------------------------------------------------------- */

#ifdef FIX_CLASS

FixStyle(ave/atom,FixAveAtom)

#else

#ifndef LMP_FIX_AVE_ATOM_H
#define LMP_FIX_AVE_ATOM_H

#include <stdio.h>
#include "fix.h"

namespace LAMMPS_NS {

class FixAveAtom : public Fix {
 public:
  FixAveAtom(class LAMMPS *, int, char **);
  ~FixAveAtom();
  int setmask();
  void init();
  void setup(int);
  void end_of_step();

  double memory_usage();
  void grow_arrays(int);
  void copy_arrays(int, int, int);
  int pack_exchange(int, double *);
  int unpack_exchange(int, double *);
  void reset_timestep(bigint);

 private:
  int nvalues;
  int nrepeat,irepeat;
  bigint nvalid;
  int *which,*argindex,*value2index;
  char **ids;
  double **array;

  bigint nextvalid();
};

}

#endif
#endif

/* ERROR/WARNING messages:

E: Illegal ... command

Self-explanatory.  Check the input script syntax and compare to the
documentation for the command.  You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.

E: Compute ID for fix ave/atom does not exist

Self-explanatory.

E: Fix ave/atom compute does not calculate per-atom values

A compute used by fix ave/atom must generate per-atom values.

E: Fix ave/atom compute does not calculate a per-atom vector

A compute used by fix ave/atom must generate per-atom values.

E: Fix ave/atom compute does not calculate a per-atom array

Self-explanatory.

E: Fix ave/atom compute array is accessed out-of-range

Self-explanatory.

E: Fix ID for fix ave/atom does not exist

Self-explanatory.

E: Fix ave/atom fix does not calculate per-atom values

A fix used by fix ave/atom must generate per-atom values.

E: Fix ave/atom fix does not calculate a per-atom vector

A fix used by fix ave/atom must generate per-atom values.

E: Fix ave/atom fix does not calculate a per-atom array

Self-explanatory.

E: Fix ave/atom fix array is accessed out-of-range

Self-explanatory.

E: Fix for fix ave/atom not computed at compatible time

Fixes generate their values on specific timesteps.  Fix ave/atom is
requesting a value on a non-allowed timestep.

E: Variable name for fix ave/atom does not exist

Self-explanatory.

E: Fix ave/atom variable is not atom-style variable

A variable used by fix ave/atom must generate per-atom values.

E: Fix ave/atom missed timestep

You cannot reset the timestep to a value beyond where the fix
expects to next perform averaging.

*/