/* -*- c++ -*- ----------------------------------------------------------
   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.

   See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */

#ifdef COMPUTE_CLASS

ComputeStyle(reduce,ComputeReduce)

#else

#ifndef LMP_COMPUTE_REDUCE_H
#define LMP_COMPUTE_REDUCE_H

#include "compute.h"

namespace LAMMPS_NS {

class ComputeReduce : public Compute {
 public:
  ComputeReduce(class LAMMPS *, int, char **);
  virtual ~ComputeReduce();
  void init();
  double compute_scalar();
  void compute_vector();
  double memory_usage();

 protected:
  int me;
  int mode,nvalues,iregion;
  int *which,*argindex,*flavor,*value2index;
  char **ids;
  double *onevec;
  int *replace,*indices,*owner;
  int index;
  char *idregion;

  int maxatom;
  double *varatom;

  struct Pair {
    double value;
    int proc;
  };
  Pair pairme,pairall;

  virtual double compute_one(int, int);
  virtual bigint count(int);
  void combine(double &, double, int);
};

}

#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: Region ID for compute reduce/region does not exist

Self-explanatory.

E: Compute reduce replace requires min or max mode

Self-explanatory.

E: Invalid replace values in compute reduce

Self-explanatory.

E: Compute ID for compute reduce does not exist

Self-explanatory.

E: Compute reduce compute does not calculate a per-atom vector

Self-explanatory.

E: Compute reduce compute does not calculate a per-atom array

Self-explanatory.

E: Compute reduce compute array is accessed out-of-range

An index for the array is out of bounds.

E: Compute reduce compute does not calculate a local vector

Self-explanatory.

E: Compute reduce compute does not calculate a local array

Self-explanatory.

E: Compute reduce compute calculates global values

A compute that calculates peratom or local values is required.

E: Fix ID for compute reduce does not exist

Self-explanatory.

E: Compute reduce fix does not calculate a per-atom vector

Self-explanatory.

E: Compute reduce fix does not calculate a per-atom array

Self-explanatory.

E: Compute reduce fix array is accessed out-of-range

An index for the array is out of bounds.

E: Compute reduce fix does not calculate a local vector

Self-explanatory.

E: Compute reduce fix does not calculate a local array

Self-explanatory.

E: Compute reduce fix calculates global values

A fix that calculates peratom or local values is required.

E: Variable name for compute reduce does not exist

Self-explanatory.

E: Compute reduce variable is not atom-style variable

Self-explanatory.

E: Fix used in compute reduce not computed at compatible time

Fixes generate their values on specific timesteps.  Compute reduce is
requesting a value on a non-allowed timestep.

*/
