dump2xyz.py
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	#!/usr/bin/env python

	# Script: dump2xyz.py
	# Purpose: convert a LAMMPS dump file to XYZ format
	# Syntax: dump2xyz.py dumpfile Nid Ntype Nx Ny Nz xyzfile
	# dumpfile = LAMMPS dump file in native LAMMPS format
	# Nid,Ntype,Nx,Ny,Nz = columns #s for ID,type,x,y,z
	# (usually 1,2,3,4,5)
	# xyzfile = new XYZ file
	# Author: Steve Plimpton (Sandia), sjplimp at sandia.gov

	import sys,os
	path = os.environ["LAMMPS_PYTHON_TOOLS"]
	sys.path.append(path)
	from dump import dump
	from xyz import xyz

	if len(sys.argv) != 8:
	raise StandardError, "Syntax: dump2xyz.py dumpfile Nid Ntype Nx Ny Nz xyzfile"

	dumpfile = sys.argv[1]
	nid = int(sys.argv[2])
	ntype = int(sys.argv[3])
	nx = int(sys.argv[4])
	ny = int(sys.argv[5])
	nz = int(sys.argv[6])
	xyzfile = sys.argv[7]

	d = dump(dumpfile)
	d.map(nid,"id",ntype,"type",nx,"x",ny,"y",nz,"z")
	x = xyz(d)
	x.one(xyzfile)