improper_class2.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.
	------------------------------------------------------------------------- */

	#ifdef IMPROPER_CLASS

	ImproperStyle(class2,ImproperClass2)

	#else

	#ifndef LMP_IMPROPER_CLASS2_H
	#define LMP_IMPROPER_CLASS2_H

	#include "stdio.h"
	#include "improper.h"

	namespace LAMMPS_NS {

	class ImproperClass2 : public Improper {
	public:
	ImproperClass2(class LAMMPS *);
	~ImproperClass2();
	void compute(int, int);
	void coeff(int, int, char **);
	void write_restart(FILE *);
	void read_restart(FILE *);

	private:
	double k0,chi0;
	double aa_k1,aa_k2,aa_k3,aa_theta0_1,aa_theta0_2,aa_theta0_3;
	int setflag_i,setflag_aa;
	double PI;

	void allocate();
	void angleangle(int, int);
	void cross(double , double , double *);
	double dot(double , double );
	};

	}

	#endif
	#endif