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comparison python/utils.py @ 197:2788b2827670

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simple cumulatie function distribution computation
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Wed, 08 Feb 2012 15:02:30 -0500
parents c06379f25ab8
children ca9d9104afba
comparison
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196:aeab0b88c9b6 197:2788b2827670
67 67
68 class EmpiricalDistribution: 68 class EmpiricalDistribution:
69 def nSamples(self): 69 def nSamples(self):
70 return sum(self.counts) 70 return sum(self.counts)
71 71
72 def cumulativeDensityFunction(sample):
73 'Returns the cumulative density function of the sample of a random variable'
74 from numpy.core.multiarray import array
75 from numpy.lib.function_base import unique
76 from numpy.core.fromnumeric import sum
77 a = array(sample)
78 a.sort()
79 xaxis = unique(a)
80 counts = [sum(a <= x) for x in xaxis]
81 return xaxis, counts
72 82
73 class EmpiricalDiscreteDistribution(EmpiricalDistribution): 83 class EmpiricalDiscreteDistribution(EmpiricalDistribution):
74 '''Class to represent a sample of a distribution for a discrete random variable 84 '''Class to represent a sample of a distribution for a discrete random variable
75 ''' 85 '''
76 from numpy.core.fromnumeric import sum 86 from numpy.core.fromnumeric import sum