fix_nvt.h
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	/* ----------------------------------------------------------------------
	LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
	www.cs.sandia.gov/~sjplimp/lammps.html
	Steve Plimpton, sjplimp@sandia.gov, Sandia National Laboratories

	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_NVT_H
	#define FIX_NVT_H

	#include "fix.h"
	class Temperature;

	class FixNVT : public Fix {
	public:
	FixNVT(int, char **);
	~FixNVT() {}
	int setmask();
	void init();
	void setup();
	void initial_integrate();
	void final_integrate();
	void initial_integrate_respa(int,int);
	void final_integrate_respa(int);
	void write_restart(FILE *);
	void restart(char *);
	int modify_param(int, char **);
	void reset_target(double);
	int thermo_fields(int, int , char *);
	int thermo_compute(double *);

	private:
	double t_start,t_stop;
	double t_current,t_target;
	double t_freq,drag,drag_factor;
	double f_eta,eta_dot,eta,factor;
	double dtv,dtf,dthalf;
	Temperature *temperature;

	int nlevels_respa;
	double *step_respa;
	};

	#endif