fix_momentum.h
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	/* -- 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 FIX_CLASS

	FixStyle(momentum,FixMomentum)

	#else

	#ifndef LMP_FIX_MOMENTUM_H
	#define LMP_FIX_MOMENTUM_H

	#include "fix.h"

	namespace LAMMPS_NS {

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

	private:
	int linear,angular;
	int xflag,yflag,zflag;
	double masstotal;
	};

	}

	#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: Fix momentum group has no atoms

	Self-explanatory.

	*/