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#! /usr/bin/env python2.2
# benchmark -- automated system for testing distcc correctness
# and performance on various source trees.
# Copyright (C) 2003 by Martin Pool
# Copyright 2008 Google Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
import math
def var(m):
"""
Variance of m.
"""
if len(m) < 2:
return None
mu = mean(m)
return sum((x - mu) * (x - mu) for x in m) / (len(m) - 1.0)
def std(m):
"""
Standard deviation of m.
"""
v = var(m)
return v and math.sqrt(v)
def mean(m):
if len(m) < 1:
return None
return sum(m)/len(m)
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