fix_spring_pull.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(spring/pull,FixSpringPull)

	#else

	#ifndef LMP_FIX_SPRING_PULL_H
	#define LMP_FIX_SPRING_PULL_H

	#include "fix.h"

	namespace LAMMPS_NS {

	class FixSpringPull : public Fix {
	public:
	FixSpringPull(class LAMMPS , int, char *);
	virtual int setmask();
	virtual void init();
	virtual void setup(int);
	virtual void min_setup(int);
	virtual void post_force(int);
	virtual void post_force_respa(int, int, int);
	virtual void min_post_force(int);
	virtual double compute_scalar();
	virtual double compute_vector(int);

	private:
	double xc,yc,zc,r0;
	double xv,yv,zv;
	double k_spring;
	int xflag,yflag,zflag;
	double masstotal;
	int nlevels_respa;
	double espring,ftotal[8];
	int force_flag;
	};

	}

	#endif
	#endif