logplot.py
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	#!/usr/bin/env python -i

	# Script: logplot.py
	# Purpose: use GnuPlot to plot two columns from a LAMMPS log file
	# Syntax: logplot.py log.lammps X Y
	# log.lammps = LAMMPS log file
	# X,Y = plot Y versus X where X,Y are thermo keywords
	# once plot appears, you are in Python interpreter, type C-D to exit
	# Author: Steve Plimpton (Sandia), sjplimp at sandia.gov

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

	if len(sys.argv) != 4:
	raise StandardError, "Syntax: logplot.py log.lammps X Y"

	logfile = sys.argv[1]
	xlabel = sys.argv[2]
	ylabel = sys.argv[3]

	lg = log(logfile)
	x,y = lg.get(xlabel,ylabel)
	g = gnu()
	g.plot(x,y)
	print "Type Ctrl-D to exit Python"