improper.cpp
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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.
	------------------------------------------------------------------------- */

	#include "math.h"
	#include "improper.h"
	#include "atom.h"
	#include "error.h"

	/* ---------------------------------------------------------------------- */

	Improper::Improper()
	{
	allocated = 0;
	PI = 4.0*atan(1.0);
	}

	/* ----------------------------------------------------------------------
	check if all coeffs are set
	------------------------------------------------------------------------- */

	void Improper::init()
	{
	if (!allocated) error->all("Improper coeffs are not set");
	for (int i = 1; i <= atom->nimpropertypes; i++)
	if (setflag[i] == 0) error->all("All improper coeffs are not set");
	}