fix_controller.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(controller,FixController)

	#else

	#ifndef LMP_FIX_CONTROLLER_H
	#define LMP_FIX_CONTROLLER_H

	#include "fix.h"

	namespace LAMMPS_NS {

	class FixController : public Fix {
	public:
	FixController(class LAMMPS , int, char *);
	~FixController();
	int setmask();
	void init();
	void end_of_step();
	void reset_dt();
	double compute_vector(int);

	private:
	double kp,ki,kd,alpha,tau;
	double setpoint;
	int pvwhich,pvindex;
	char pvID,cvID;
	int firsttime;

	double control,err,olderr,deltaerr,sumerr;

	class Compute *pcompute;
	class Fix *pfix;
	int pvar,cvar;
	};

	}

	#endif
	#endif

	/* ERROR/WARNING messages:

	*/