log2txt.py
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	#!/usr/bin/env python

	# Script: log2txt.py
	# Purpose: extract thermo info from LAMMPS log file
	# create a text file of numbers in columns, suitable for plotting
	# Syntax: log2txt.py log.lammps data.txt X Y ...
	# log.lammps = LAMMPS log file
	# data.txt = text file to create
	# X Y ... = columns to include (optional), X,Y are thermo keywords
	# if no columns listed, all columns are included
	# 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

	if len(sys.argv) < 3:
	raise StandardError, "Syntax: log2txt.py log.lammps data.txt X Y ..."

	logfile = sys.argv[1]
	datafile = sys.argv[2]
	columns = sys.argv[3:]

	lg = log(logfile)
	if columns == []:
	lg.write(datafile)
	else:
	str = "lg.write(datafile,"
	for word in columns: str += '"' + word + '",'
	str = str[:-1] + ')'
	eval(str)