[SciPy-user] Error in scipy.stats.poisson

John Reid j.reid@mail.cryst.bbk.ac...
Wed Aug 29 10:13:14 CDT 2007


Hi,

Should the following code work?

import scipy.stats as S
r=S.poisson(4)
r.pdf(2)


I get the following error:
C:\apps\Python25\Lib\site-packages\scipy\stats\distributions.py in 
pdf(self, x)
     104         self.dist = dist
     105     def pdf(self,x):
--> 106         return self.dist.pdf(x,*self.args,**self.kwds)
     107     def cdf(self,x):
     108         return self.dist.cdf(x,*self.args,**self.kwds)

<type 'exceptions.AttributeError'>: poisson_gen instance has no 
attribute 'pdf'

S.poisson does have a pmf function not a pdf function. Is this the cause?

John.



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