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fix_drag.h
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			/* ----------------------------------------------------------------------
			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.
			------------------------------------------------------------------------- */

			#ifndef FIX_DRAG_H
			#define FIX_DRAG_H

			#include "fix.h"

			namespace LAMMPS_NS {

			class FixDrag : public Fix {
			public:
			FixDrag(class LAMMPS , int, char *);
			int setmask();
			void init();
			void setup(int);
			void post_force(int);
			void post_force_respa(int, int, int);
			double compute_vector(int);

			private:
			double xc,yc,zc;
			double f_mag;
			int xflag,yflag,zflag;
			double delta;
			int nlevels_respa;
			double ftotal[3],ftotal_all[3];
			int force_flag;
			};

			}

			#endif