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30 lines
626 B
30 lines
626 B
14 years ago
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# $Id: avg.py,v 1.1 2010-10-07 15:56:55 wirawan Exp $
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# Create: 20090112
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import math
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class avg(object):
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def __init__(self):
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self.clear()
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def clear(self):
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self.N = 0
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self.sum1 = 0.0
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self.sum2 = 0.0
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def add(self, value):
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self.N += 1
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self.sum1 += value
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self.sum2 += value*value
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return self
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#__add__ = add << HERETICAL!!!
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def mean(self):
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return self.sum1 / self.N
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def stddev(self):
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N = self.N
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avg1 = self.sum1 / N
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avg2 = self.sum2 / N
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return math.sqrt(abs( (avg2 - avg1**2) * N / (N - 1) ))
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# Operator overloading:
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avg.__iadd__ = avg.add
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avg.__call__ = avg.mean
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