cdf-gen.py
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	#!/usr/bin/python

	# I don't think this works if columns are of different sizes
	#and smaller columns are in between larger ones

	import sys
	import string
	import os

	if len(sys.argv)!=3:
	print "Usage: ./cdf-gen.py INUPT_FILENAME COLUMN_NR_STARTING_FROM_0"
	exit(1)

	filename = sys.argv[1]
	column = int(sys.argv[2])

	fd = open(filename, 'rb')

	responseTimes = []
	for line in fd.readlines():
	if len(line.strip()):
	try:
	responseTimes.append(float(string.split(line)[column]))
	except :
	print >> sys.stderr,"cdf-gen.py error reading ",filename," at line: ",len(responseTimes)

	responseTimes.sort()

	total_traffic=0
	for time in responseTimes:
	total_traffic += time

	prob = 0
	for time in responseTimes:
	prob += 1.0 / len(responseTimes)
	# prob += time *1.0 / total_traffic
	print "%.4f\t%.4f" % (prob*100, time)